Page 2: Safety Precautions
Safety Precautions Before installing the unit, thoroughly read the following safety precautions. Observe these safety precautions for your safety. WARNING This symbol is intended to alert the user to the presence of important instructions that must be followed to avoid the risk of serious injury or death.
Page 3 WARNING Securely attach the terminal block cover (panel) to the After completing the service work, check for a gas unit. leak. If the terminal block cover (panel) is not installed properly, If leaked refrigerant is exposed to a heat source, such as a dust and/or water may infiltrate and pose a risk of electric fan heater, stove, or electric grill, poisonous gases may be shock, smoke, and/or fire.
Page 4 Precautions for handling units for use with R410A CAUTION Do not use the existing refrigerant piping. Use a vacuum pump with a reverse-flow check valve. A large amount of chlorine that may be contained in the re- If a vacuum pump that is not equipped with a reverse-flow sidual refrigerant and refrigerating machine oil in the exist- check valve is used, the vacuum pump oil may flow into the ing piping may cause the refrigerating machine oil in the...
Page 5: Before Installing The Unit
Before installing the unit WARNING Do not install the unit where a gas leak may occur. When installing the unit in a hospital, take appropriate measures to reduce noise interference. If gaseous refrigerant leaks and piles up around the unit, it may be ignited.
Page 6 Before installing the unit (moving and reinstalling the unit) and performing electrical work CAUTION Properly ground the unit. Periodically check the installation base for damage. Do not connect the grounding wire to a gas pipe, water pipe, If the unit is left on a damaged platform, it may fall and lightning rod, or grounding wire from a telephone pole.
Page 7 Before the test run CAUTION Turn on the unit at least 12 hours before the test run. Do not operate the unit without panels and safety guards. Keep the unit turned on throughout the season. If the unit is turned off in the middle of a season, it may result in malfunc- Rotating, high-temperature, or high-voltage parts on the unit tions.
Page 8: Table Of Contents
CONTENTS I Read Before Servicing [1] Read Before Servicing......................3 [2] Necessary Tools and Materials ....................4 [3] Piping Materials ........................5 [4] Storage of Piping ........................7 [5] Pipe Processing........................7 [6] Brazing............................8 [7] Air Tightness Test........................9 [8] Vacuum Drying (Evacuation) ....................
Page 9 HWE08040...
Page 10 I Read Before Servicing [1] Read Before Servicing ....................... 3 [2] Necessary Tools and Materials..................4 [3] Piping Materials ......................... 5 [4] Storage of Piping ....................... 7 [5] Pipe Processing ......................... 7 [6] Brazing..........................8 [7] Air Tightness Test ......................9 [8] Vacuum Drying (Evacuation) ...................
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Page 12: Read Before Servicing
[ I Read Before Servicing ] I Read Before Servicing [1] Read Before Servicing 1. Check the type of refrigerant used in the system to be serviced. Refrigerant Type Multi air conditioner for building application CITY MULTI THMU-A, YHMU-A series R410A 2.
Page 13: Necessary Tools And Materials
[ I Read Before Servicing ] [2] Necessary Tools and Materials Prepare the following tools and materials necessary for installing and servicing the unit. Tools for use with R410A (Adaptability of tools that are for use with R22 or R407C) 1.
Page 14: Piping Materials
[ I Read Before Servicing ] [3] Piping Materials Do not use the existing piping! 1. Copper pipe materials O-material (Annealed) Soft copper pipes (annealed copper pipes). They can easily be bent with hands. 1/2H-material (Drawn) Hard copper pipes (straight pipes). They are stronger than the O-material (Annealed) at the same radial thickness.
Page 15 [ I Read Before Servicing ] 4. Thickness and refrigerant type indicated on the piping materials Ask the pipe manufacturer for the symbols indicated on the piping material for new refrigerant. 5. Flare processing (O-material (Annealed) and OL-material only) The flare processing dimensions for the pipes that are used in the R410A system are larger than those in the R22 system. Flare processing dimensions (mm[in]) A dimension (mm) Pipe size (mm[in])
Page 16: Storage Of Piping
[ I Read Before Servicing ] [4] Storage of Piping 1. Storage location Store the pipes to be used indoors. (Warehouse at site or owner's warehouse) If they are left outdoors, dust, dirt, or moisture may infiltrate and contaminate the pipe. 2.
Page 17: Brazing
[ I Read Before Servicing ] [6] Brazing No changes have been made in the brazing procedures. Perform brazing with special care to keep foreign objects (such as oxide scale, water, and dust) out of the refrigerant system. Example: Inside the brazed connection Use of oxidized solder for brazing Use of non-oxidized solder for brazing 1.
Page 18: Air Tightness Test
[ I Read Before Servicing ] [7] Air Tightness Test No changes have been made in the detection method. Note that a refrigerant leak detector for R22 will not detect an R410A leak. Halide torch R22 leakage detector 1. Items to be strictly observed Pressurize the equipment with nitrogen up to the design pressure (4.15MPa[601psi]), and then judge the equipment's air tight- ness, taking temperature variations into account.
Page 19: Vacuum Drying (Evacuation)
[ I Read Before Servicing ] [8] Vacuum Drying (Evacuation) (Photo1) 15010H (Photo2) 14010 Recommended vacuum gauge: ROBINAIR 14010 Thermistor Vacuum Gauge 1. Vacuum pump with a reverse-flow check valve (Photo1) To prevent the vacuum pump oil from flowing into the refrigerant circuit during power OFF or power failure, use a vacuum pump with a reverse-flow check valve.
Page 20: Refrigerant Charging
[ I Read Before Servicing ] [9] Refrigerant Charging Cylinder with a siphon Cylinder without a siphon Cylin- Cylin- Cylinder color R410A is pink. Refrigerant charging in the liquid state Valve Valve liquid liquid 1. Reasons R410A is a pseudo-azeotropic HFC blend (boiling point R32=-52°C[-62°F], R125=-49°C[-52°F]) and can almost be handled the same way as a single refrigerant, such as R22.
Page 21: Characteristics Of The Conventional And The New Refrigerants
[ I Read Before Servicing ] [11] Characteristics of the Conventional and the New Refrigerants 1. Chemical property As with R22, the new refrigerant (R410A) is low in toxicity and chemically stable nonflammable refrigerant. However, because the specific gravity of vapor refrigerant is greater than that of air, leaked refrigerant in a closed room will accumulate at the bottom of the room and may cause hypoxia.
Page 22: Notes On Refrigerating Machine Oil
[ I Read Before Servicing ] [12] Notes on Refrigerating Machine Oil 1. Refrigerating machine oil in the HFC refrigerant system HFC type refrigerants use a refrigerating machine oil different from that used in the R22 system. Note that the ester oil used in the system has properties that are different from commercially available ester oil. Refrigerant Refrigerating machine oil Mineral oil...
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Page 24: Restrictions
II Restrictions [1] System configuration ....................... 17 [2] Types and Maximum allowable Length of Cables ............18 [3] Switch Settings and Address Settings ................19 [4] Sample System Connection..................... 26 [5] An Example of a System to which an MA Remote Controller is connected..... 27 [6] An Example of a System to which an M-NET Remote Controller is connected....
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Page 26: System Configuration
[ II Restrictions ] II Restrictions [1] System configuration 1. Table of compatible indoor units The table below summarizes the types of indoor units that are compatible with different types of outdoor units. Outdoor Composing units Maximum total capacity Maximum number Types of connectable in- units of connectable indoor...
Page 27: Types And Maximum Allowable Length Of Cables
[ II Restrictions ] [2] Types and Maximum allowable Length of Cables 1. Wiring work (1) Notes 1) Have all electrical work performed by an authorized electrician according to the local regulations and instructions in this man- ual. 2) Install external transmission cables at least 5cm [1-31/32"] away from the power supply cable to avoid noise interference. (Do not put the control cable and power supply cable in the same conduit tube.) 3) Provide grounding for the outdoor unit as required.
Page 28: Switch Settings And Address Settings
[ II Restrictions ] 2) Remote controller wiring MA remote controller M-NET remote controller Type Number of 2-core cable 2-core cable cores Cable type 2 *3 2 *3 0.3 to 1.25mm 0.3 to 1.25mm [AWG22 to 16] [AWG22 to 16] Cable size (0.75 to 1.25mm (0.75 to 1.25mm...
Page 29 [ II Restrictions ] 2. M-NET Address settings (1) Address settings table The need for address settings and the range of address setting depend on the configuration of the system. Unit or controller Address setting Setting method Facto- range ry set- ting CITY MULTI in- Main/sub unit...
Page 30 [ II Restrictions ] (2) Power supply switch connector connection on the outdoor unit (Factory setting: The male power supply switch connector is connected to CN41.) System configu- Connection to Power supply unit Group operation Power supply switch connector connection ration the system con- for transmission...
Page 31 [ II Restrictions ] (6) Miscellaneous settings Cooling-only setting for the indoor unit: Cooling only model (Factory setting: SW3-1 "OFF.") When using indoor unit as a cooling-only unit, set SW3-1 to ON. (7) Various types of control using input-output signal connector on the outdoor unit (various connection options) Terminal Type Usage...
Page 32 [ II Restrictions ] Example of wiring connection (1) CN51 (2) CN3S Outdoor unit Relay circuit Adapter 2 Distant control control board Relay circuit Adapter 1 board Outdoor unit CN3S control board CN51 Preparations in the field Maximum cable Preparations length is 10m Maximum cable in the field...
Page 33 [ II Restrictions ] 1) SW4-4: OFF (Compressor ON/OFF, Low-noise mode) CN3D 1-3P Compressor ON/OFF Open Compressor ON Short-circuit Compressor OFF CN3D 1-2P Low-noise mode Open Short-circuit *1. When SW4-4 on the outdoor unit in one refrigerant circuit system is set to ON , this function cannot be used. *2.
Page 34 [ II Restrictions ] (*4) 4) When SW4-4 on the all outdoor units in one refrigerant circuit system is set to ON (12 levels of on-DEMAND) 12 levels No.2 CN3D 1-2P Open of on-DE- 1-3P Open Short-circuit MAND No.3 CN3D 1-2P Open Short-circuit...
Page 35: Sample System Connection
[ II Restrictions ] [4] Sample System Connection Examples of typical system connection are shown on pages [5] to [7]. Refer to the Installation Manual that came with each device or controller for details. (1) An example of a system to which an MA remote controller is connected System Address start up for in- Connection to the system controller...
Page 36: An Example Of A System To Which An Ma Remote Controller Is Connected
[ II Restrictions ] [5] An Example of a System to which an MA Remote Controller is connected 1. System with one outdoor unit (automatic address setup for both indoor and outdoor units) (1) Sample control wiring Interlock operation with the ventilation unit Leave the male Leave the male...
Page 37 [ II Restrictions ] MA remote controller function selection or the installation (4) Wiring method manual for the MA remote controller for the setting meth- 1) Indoor/outdoor transmission line od.) Daisy-chain terminals M1 and M2 on the terminal block Group operation of indoor units for indoor-outdoor transmission line (TB3) on the outdoor To perform a group operation of indoor units (IC), daisy- units (OC, OS1, OS2) (Note 1), and terminals M1 and M2...
Page 38 [ II Restrictions ] 2. An example of a system with one outdoor unit to which 2 or more LOSSNAY units are connected (manual address setup for both indoor and outdoor units) (1) Sample control wiring Interlock operation with the ventilation unit Leave the male Leave the male Leave the male...
Page 39 [ II Restrictions ] 4) LOSSNAY connection (4) Wiring method Connect terminals M1 and M2 on the terminal block 1) Indoor/outdoor transmission line (TB5) on the indoor unit (IC) to the appropriate terminals Same as [5] 1. on the terminal block (TB5) on LOSSNAY (LC). (Non-po- Shielded cable connection larized two-wire) Same as [5] 1.
Page 40 [ II Restrictions ] 3. Group operation of units in a system with multiple outdoor units (1) Sample control wiring Interlock operation with the ventilation unit CN41 CN40 Replace Leave the male Leave the male Group Group Group connector on connector on SW2-1 OFF CN41 as it is.
Page 41 [ II Restrictions ] Only use shielded cables. (4) Wiring method Shielded cable connection 1) Indoor/outdoor transmission line Daisy-chain the S terminal on the terminal block (TB7) on Same as [5] 1. the outdoor units (OC, OS1, OS2) with the shield wire of Only use shielded cables.
Page 42 [ II Restrictions ] 4. A system in which a system controller is connected to the transmission line for centralized control and which is pow- ered from an outdoor unit (1) Sample control wiring Interlock operation with the ventilation unit Leave the male Leave the male CN41...
Page 43 [ II Restrictions ] Shielded cable connection (4) Wiring method Daisy-chain the S terminal on the terminal block (TB7) on 1) Indoor/outdoor transmission line the outdoor units (OC, OS1, OS2) with the shield wire of Same as [5] 1. the shielded cable. Short-circuit the earth terminal ( and the S terminal on the terminal block (TB7) on the out- Only use shielded cables.
Page 44 [ II Restrictions ] 5. An example of a system in which a system controller is connected to the indoor-outdoor transmission line (except LM adapter) (1) Sample control wiring Interlock operation with the ventilation unit Leave the male Leave the male CN41 CN40 Replace connector on...
Page 45 [ II Restrictions ] Set the central control switch (SW2-1) on the control (4) Wiring method board of all outdoor units to "ON." 1) Indoor/outdoor transmission line Only use shielded cables. Daisy-chain terminals M1 and M2 on the terminal block Shielded cable connection for indoor-outdoor transmission line (TB3) on the outdoor Daisy-chain the S terminal on the terminal block (TB7) on...
Page 46: An Example Of A System To Which An M-Net Remote Controller Is Connected
[ II Restrictions ] [6] An Example of a System to which an M-NET Remote Controller is connected (1) Sample control wiring Interlock operation with the ventilation unit CN41 CN40 Replace Leave the male Leave the male connector on connector on SW2-1 OFF ON CN41 as it is.
Page 47 [ II Restrictions ] When 2 remote controllers are connected to the sys- (4) Wiring method 1) Indoor/outdoor transmission line Refer to the section on Switch Setting. Same as [5] 3. Performing a group operation (including the group Shielded cable connection operation of units in different refrigerant circuits).
Page 48: An Example Of A System To Which Both Ma Remote Controller And M-Net Remote Controller Are Connected
[ II Restrictions ] [7] An Example of a System to which both MA Remote Controller and M-NET Remote Controller are connected (1) Sample control wiring Leave the male Leave the male CN41 CN40 Replace connector on connector on Group Group SW2-1 OFF ON CN41 as it is.
Page 49 [ II Restrictions ] Same as [5] 1. (4) Wiring method Group operation of indoor units 1) Indoor/outdoor transmission line Same as [5] 1. Same as [5] 3. 4) M-NET remote controller wiring Shielded cable connection Same as [5] 1. Same as [5] 1.
Page 50: Restrictions On Pipe Length
[ II Restrictions ] [8] Restrictions on Pipe Length (1) End branching P72 - P120 models Outdoor unit Branch header First branch (Branch joint) Indoor Indoor Indoor Branch joint Indoor Indoor Indoor Unit: m [ft] Allowable length of Operation Pipe sections pipes Length Total pipe length...
Page 51 [ II Restrictions ] P144 - P360 models The figure shows a system with three outdoor units. (P264-P360 models) Provide a trap on the pipe (gas pipe only) within 2 m from the Note1 Install the pipe that connects the branch pipe and the outdoor units in joint pipe if the total length of the pipe that connects the joint the way that it has a downward inclination toward the branch pipe.
Page 52 [ II Restrictions ] 1. Refrigerant pipe size (1) Diameter of the refrigerant pipe between the outdoor unit and the first branch (outdoor unit pipe size) Outdoor unit set name Liquid pipe size (mm) [inch] Gas pipe size (mm) [inch] (total capacity) 72 model ø9.52 [3/8"]...
Page 53 [ II Restrictions ] (4) Size of the refrigerant pipe between the first distributor and the second distributor Liquid pipe size (mm) [inch] Gas pipe size (mm) [inch] ø19.05 [3/4"] ø34.93 [1-3/8"] (5) Size of the refrigerant pipe between the first distributor or the second distributor and outdoor units Liquid pipe size (mm) [inch] Gas pipe size (mm) [inch] 72 model ø9.52 [3/8"]...
Page 54: Outdoor Unit Components
III Outdoor Unit Components [1] Outdoor Unit Components and Refrigerant Circuit ............47 [2] Control Box of the Outdoor Unit..................49 [3] Outdoor Unit Circuit Board....................52 HWE08040 - 45 -...
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Page 56: Outdoor Unit Components And Refrigerant Circuit
[ III Outdoor Unit Components ] III Outdoor Unit Components [1] Outdoor Unit Components and Refrigerant Circuit 1. PUHY-P72, P96, P120THMU-A PUHY-P72, P96, P120YHMU-A (1) Front view of a outdoor unit Fan guard Control Heat exchanger Front panel Fin guard HWE08040 - 47 -...
Page 57 [ III Outdoor Unit Components ] 2. PUHY-P72, P96THMU-A PUHY-P72, P96YHMU-A (1) Refrigerant circuit Low pressure sensor(63LS) High pressure sensor(63HS1) High-pressure switch(63H1) Check valve Transformer Box (YHMU-A only) 4-way valve(21S4b) Accumulator 4-way valve(21S4a) Low pressure check joint Subcool coil High pressure check joint Compressor cover Linear Expansion Valve(LEV1) Solenoid valve(SV5b)
Page 58: Control Box Of The Outdoor Unit
[ III Outdoor Unit Components ] [2] Control Box of the Outdoor Unit <HIGH VOLTAGE WARNING> Control box houses high-voltage parts. When opening or closing the front panel of the control box, do not let it come into contact with any of the internal components.
Page 59 [ III Outdoor Unit Components ] 2. PUHY-P120THMU-A Note.2 Fan board INV board Control board DC reactor (DCL) Electromagnetic relay (72C) Diode stack Noise filter Current sensor (ACCT3) M-NET board Current sensor (DCCT1) Terminal block for power supply (TB1) Current sensor Ground terminal Note.1 Terminal block for transmission line...
Page 60 [ III Outdoor Unit Components ] 4. Transformer Box (PUHY-P72, P96, P120YHMU-A) Transformer (T03) Transformer (T02) HWE08040 - 51 -...
Page 61: Outdoor Unit Circuit Board
[ III Outdoor Unit Components ] [3] Outdoor Unit Circuit Board 1. Outdoor unit control board CN332 CNDC Serial communication signal input Output 18VDC CN801 Bus voltage input GND INV board Pressure switch Output 17VDC connection (Fan board) Serial communication signal output CNAC2 CN505 72C driving output...
Page 62 [ III Outdoor Unit Components ] 2. M-NET board CNS2 CNIT CN102 CN04 Input 12VDC Transmission line Bus voltage input Power supply output for centralized CN03(THMU only) input/output for (YHMU only) control system (30VDC) (THMU only) Input 5VDC Bus voltage input centralized control Bus voltage output Indoor/outdoor transmission line...
Page 63 [ III Outdoor Unit Components ] 3. INV board (1) PUHY-P72, P96THMU-A Open: No-load operation setting CN5V Short-circuited: Normal setting SC-P1 Rectifier diode output (P) Output 5VDC LED1 Lit: Inverter in normal operation Blink: Inverter error IGBT (Rear) GND(INV Boar) Serial communication signal output C30,31,32 Smoothing capacitor...
Page 64 [ III Outdoor Unit Components ] (2) PUHY-P120THMU-A CNCT3 CNTH Current (AC) sensor input Thermistor input (ACCT3) LED2 (THHS) CNTYP CNCT2 Inverter error Function setting input Current (AC) sensor input (Z26) LED4 ACCT1 LED1 Lit during normal Inverter in ACCT2 normal operation CPU operation ON: No-load operation setting...
Page 65 [ III Outdoor Unit Components ] (3) PUHY-P72, P96, P120YHMU-A SC-P1 Rectifier diode output (P) Open: No-load operation setting CN5V RSH1 SC-P2 Short-circuited: Normal setting LED1 Overcurrent detection Bus voltage Input(P) Lit: Inverter in normal operation Output 5VDC resistor Blink: Inverter error GND(INV Board) Serial communication signal output...
Page 66 [ III Outdoor Unit Components ] 4. Fan board (1) PUHY-P72, P96, P120THMU-A CNVDC Bus voltage input Serial communication signal output CN18V LED3 Fuse Input 18VDC GND Control board Lit during normal 250VAC 15A Serial communication signal output CPU operation CN22 GND INV board Input 5VDC...
Page 67 [ III Outdoor Unit Components ] (2) PUHY-P72, P96, P120YHMU-A LED3 CN18V Lit during normal Input 18VDC Serial communication signal output CPU operation GND(Control board) Serial communication signal output CN21 Serial communication signal output GND(INV board) CNVDC Input 17VDC Bus voltage input CN22 GND(INV board) Input 5VDC...
Page 68 [ III Outdoor Unit Components ] 5. Noise Filter (1) PUHY-P72, P96THMU-A TB21 CN02 Input/output L1 Output Grounding TB22 Input/output L2 Fuse 250VAC 6.3A TB23 Input/output L3 Fuse 250VAC 6.3A CN01 Input HWE08040 - 59 -...
Page 69 [ III Outdoor Unit Components ] (2) PUHY-P120THMU-A R1,2 TB42 TB31 CN03 Rush current Bus voltage output N Bus voltage output P 72C drive input protection resistor Electromagnetic relay Fuse 250VAC 6.3A Diode stack rectified voltage Grounding input (Diode stack output) Output Diode stack input CN02...
Page 70 [ III Outdoor Unit Components ] (3) PUHY-P72, P96, P120YHMU-A Output Output (Rectified L2-L3 current) (Rectified L2-L3 current) Input Surge absorber circuit Surge absorber circuit Short circuit Short circuit Grounding F1,F2,F3,F4 Fuse 250VAC 6.3A Grounding CN1A Input CN1B TB21 TB22 TB23 Input Input/output(L1)
Page 71 [ III Outdoor Unit Components ] HWE08040 - 62 -...
Page 72: Remote Controller
IV Remote Controller [1] Functions and Specifications of MA and ME Remote Controllers ........65 [2] Group Settings and Interlock Settings via the ME Remote Controller ......66 [3] Interlock Settings via the MA Remote Controller ............. 70 [4] Using the built-in Temperature Sensor on the Remote Controller ........71 HWE08040 - 63 -...
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Page 74: Functions And Specifications Of Ma And Me Remote Controllers
[ IV Remote Controller ] IV Remote Controller [1] Functions and Specifications of MA and ME Remote Controllers There are two types of remote controllers: M-NET (ME) remote controller, which is connected on the indoor-outdoor transmission line, and MA remote controller, which is connected to each indoor unit. 1.
Page 75: Group Settings And Interlock Settings Via The Me Remote Controller
[ IV Remote Controller ] [2] Group Settings and Interlock Settings via the ME Remote Controller 1. Group settings/interlock settings Make the following settings to perform a group operation of units that are connected to different outdoor units or to manually set up the indoor/outdoor unit address.
Page 76 [ IV Remote Controller ] Repeat steps in the previous page to interlock all the indoor units in a group with the LOSSNAY unit. (C) To return to the normal display When all the group settings and interlock settings are made, take the To go back to the normal display, To search for an address, follow step...
Page 77 [ IV Remote Controller ] (A) To delete group settings (B) To delete interlock settings <Successful completion of deletion> If deletion is successfully completed, will appear in the unit type display window. If the deletion fails, will (Displayed alternately) will be displayed in the room temperature display window. appear in the unit type display - If a transmission error occurs, the selected setting will not be window.
Page 78 [ IV Remote Controller ] [Operation Procedures] 1. Press the [ON/OFF] button on the remote controller to bring the unit to a stop. The display will appear as shown in the previous page (Normal display). 2. Press buttons [CHECK] and [ ] simultaneously for 2 seconds to go into the “Skip-Auto-Mode setting.”...
Page 79: Interlock Settings Via The Ma Remote Controller
[ IV Remote Controller ] [3] Interlock Settings via the MA Remote Controller 1. LOSSNAY interlock setting (Make this setting only when necessary.) Make this setting only when necessary. Perform this operation to enter the interlock setting between the LOSSNAY and the indoor units to which the remote controller is connected, or to search and delete registered information.
Page 80: Using The Built-In Temperature Sensor On The Remote Controller
[ IV Remote Controller ] < 2. Search Procedures > To search for the LOSSNAY unit that is interlocked with a particular indoor unit, enter the address of the indoor unit into the remote controller that is connected to it. <Indoor unit address>...
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Page 82: Electrical Wiring Diagram
V Electrical Wiring Diagram [1] Electrical Wiring Diagram of the Outdoor Unit ..............75 [2] Electrical Wiring Diagram of Transmission Booster............78 HWE08040 - 73 -...
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Page 84: Electrical Wiring Diagram Of The Outdoor Unit
[ V Electrical Wiring Diagram ] V Electrical Wiring Diagram [1] Electrical Wiring Diagram of the Outdoor Unit 1. Electrical wiring diagram of the outdoor unit (1) PUHY-P72, P96THMU-A HWE08040 - 75 -...
Page 85 [ V Electrical Wiring Diagram ] (2) PUHY-P120THMU-A HWE08040 - 76 -...
Page 86 [ V Electrical Wiring Diagram ] (3) PUHY-P72, P96,P120YHMU-A HWE08040 - 77 -...
Page 87: Electrical Wiring Diagram Of Transmission Booster
[ V Electrical Wiring Diagram ] [2] Electrical Wiring Diagram of Transmission Booster Terminal block for power supply (TB1) 250V 5A Red Red Red Black White White Green/Yellow 100V/200VAC Varistor Noise filter Black White White White White Varistor Green Black Stabilized power supply Blue Black...
Page 88: Refrigerant Circuit
VI Refrigerant Circuit [1] Refrigerant Circuit Diagram ..................... 81 [2] Principal Parts and Functions ..................82 HWE08040 - 79 -...
Page 89 - 80 -...
Page 90: Refrigerant Circuit Diagram
[ VI Refrigerant Circuit ] VI Refrigerant Circuit [1] Refrigerant Circuit Diagram 1. Outdoor unit (1) PUHY-P72, P96 models 21S4b 21S4a 63H1 63HS1 63LS SV1a Comp SV5b LEV2a LEV1 LEV2b (2) PUHY-P120 models 21S4c 21S4b 21S4a 63H1 63HS1 63LS SV1a Comp SV5c SV5b...
Page 91: Principal Parts And Functions
[ VI Refrigerant Circuit ] [2] Principal Parts and Functions 1. Outdoor unit Part Symbols Notes Usage Specifications Check method name (functions) Com- Adjusts the amount of circulating P72 and 96 models pressor (Comp1) refrigerant by adjusting the operat- Low-pressure shell scroll ing frequency based on the oper- compressor ating pressure data...
Page 92 [ VI Refrigerant Circuit ] Part Symbols Notes Usage Specifications Check method name (functions) Ther- 1) Detects discharge air temper- Degrees Celsius Resistance mistor (Discharge) check ature = 7.465k = 4057 2) Provides high-pressure pro- 25/120 tection 7.465 4057 0°C[32°F] :698kohm 10°C[50°F] :413kohm 20°C[68°F] :250kohm 30°C[86°F] :160kohm...
Page 93 [ VI Refrigerant Circuit ] Part Symbols Notes Usage Specifications Check method name (functions) Linear LEV1 Adjusts the amount of bypass flow DC12V Same as in- expan- (SC control) from the liquid pipe on the outdoor Opening of a valve driven by a door LEV sion unit during cooling...
Page 94 [ VI Refrigerant Circuit ] 2. Indoor Unit Part Symbol Notes Usage Specification Check method Name (functions) Linear 1) Adjusts superheat at the DC12V Refer to the section expan- Opening of stepping motor "Continuity Test with a indoor heat exchanger sion valve driving valve 0-(1400) puls- Tester".
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Page 96: Control
VII Control [1] Functions and Factory Settings of the Dipswitches ............89 [2] Controlling the Outdoor Unit .................... 96 [3] Operation Flow Chart..................... 108 HWE08040 - 87 -...
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Page 98: Functions And Factory Settings Of The Dipswitches
[ VII Control ] VII Control [1] Functions and Factory Settings of the Dipswitches 1. Outdoor unit (1) Control board Units that re- quire switch Function according to switch setting Switch setting timing setting Switch Function Note.2 Unit address setting Set to 00 or 51-100 with the dial switch Before power on For self-diagnosis/...
Page 99 [ VII Control ] Units that require Function according to switch setting Switch setting timing switch set- Switch Function ting Note.2 Test run mode: en- SW3-2 disabled SW3-2 enabled Anytime after power on abled/disabled Test run mode: ON/ Sends a test-run After power on and when Stops all ICs signal to all IC...
Page 100 [ VII Control ] Units that re- quire switch Function according to switch setting Switch setting timing setting Switch Function Note.2 Model setting Capacity priority Low-noise mode mode Low-noise mode Before being energized selection Note 3 Model setting Heating backup Ineffective Effective Any time after power on...
Page 101 [ VII Control ] 2) PUHY-P120THMU-A Function according to switch Switch setting timing setting Switch Function Enabling/disabling the following error Error detec- Error detec- Anytime after power on detection functions; tion enabled tion disable ACCT/DCCT sensor failure (No load op- (5301 Detail No.
Page 102 [ VII Control ] 2. Function of the switch (Indoor unit) (1) Dipswitches 1) SW1,3 Function according to switch setting Switch setting timing Switch Function Notes Set to ON (built-in sensor on the remote controller) Room temperature Built-in sensor on Indoor unit inlet on All Fresh (PEFY-VMH-F) model units detection position...
Page 103 [ VII Control ] 3. Function of the switch <Remote controller> (1) MA remote controller (PAR-20MAA) The SW is located at the bottom of the remote controller under the cover. Operate the switches to perform the remote con- troller main/sub setting or other function settings. Normally, do not change the settings of switches other than the SW1 (main/ sub switching switch).
Page 104 [ VII Control ] (2) ME remote controller (PAR-F27MEA) Set the address of the remote controller with the rotary switch. Rotary switch 10's digit 1's digit (left) (right) Remote controller unit Example: In case of address 108 Address setting range Setting method Main remote controller 101-150...
Page 105: Controlling The Outdoor Unit
[ VII Control ] [2] Controlling the Outdoor Unit -1- Outline of Control Method The outdoor units are designated as OC, OS1 and OS2 in the order of capacity from large to small (if two or more units have the same capacity, in the order of address from small to large). The setting of outdoor unit can be verified by using the self-diagnosis switch (SW1).
Page 106 [ VII Control ] -5- Bypass Control Bypass solenoid valves (SV1a), which bypass the high- and low- pressure sides, perform the following functions. (1) Bypass solenoid valve (SV1a) (ON = Open), (SV9) (ON = Open) SV1a Operation When starting-up the compressor of each ON for 4 minutes.
Page 107 [ VII Control ] -6- Compressor Frequency Control Depending on the capacity required, the frequency of the compressor is controlled to keep constant evaporation temperature (0°C [32°F] = 0.71 MPa [103 psi]) during cooling operation, and condensing temperature (49°C [120°F] = 2.88 MPa [418 psi]) during heating operation.
Page 108 [ VII Control ] -7- Defrost Operation Control (1) Starting the defrost operation The defrost cycle starts when the pipe temperature (TH3), in the following table, or below has continuously been detected for 3 minutes after the integrated compressor operation time of 50 minutes have passed. If 10 minutes have passed since compressor start-up or since the completion of defrost operation, forced defrost operation will start by turning on the forced defrost switch (DIP SW2-7).
Page 109 [ VII Control ] -8- Refrigerant Recovery Control Recovery of refrigerant is performed during heating operation to prevent the refrigerant from accumulating inside the unit while it is stopped (unit in fan mode), or inside the indoor unit that is in cooling mode or in heating mode with thermo off. It is also performed during cooling operation to prevent an excessive amount of refrigerant from accumulating in the outdoor heat ex- changer.
Page 110 [ VII Control ] (2) During cooling operation Starting refrigerant recovery mode The refrigerant recovery mode starts when all the following conditions are met: 30 minutes have passed since the completion of previous refrigerant recovery. When the unit keeps running for 3 minutes in a row or more with high discharge temperature TH4 >...
Page 111 [ VII Control ] (2) P144, P168, P192, P216, P240 models Initial startup mode starts. The compressor on the OC starts up. 60Hz The total operating load of the indoor unit after 5 minutes of operation is P96 or above. (*1 Qj The compressor on the OC starts up.
Page 112 [ VII Control ] (3) P264, P288, P312, P336, P368 models Initial startup mode starts. The compressor on the OC starts up. 60Hz The total operating load of the indoor unit after 5 minutes of operation is P96 or above. ( *1 The total operating load of the indoor unit after 5 minutes of operation is between P96 and P400.
Page 113 [ VII Control ] -13- Emergency Operation Mode 1. Problems with the outdoor unit Emergency operation mode is a temporary operation mode in which the outdoor unit that is not in trouble operates when one of the outdoor units in the P144 through P240 models is in trouble or when one or two of the outdoor units in the P264 througt P360 models are in trouble.
Page 114 [ VII Control ] (2) Ending the emergency operation 1) End conditions When one of the following conditions is met, emergency operation stops, and the unit makes an error stop. When the integrated operation time of compressor in cooling mode has reached four hours. When the integrated operation time of compressor in heating mode has reached two hours.
Page 115 [ VII Control ] Emergency operation pattern (2 outdoor units) OC failure OS failure pattern pattern Trouble Normal Normal Trouble Cooling Emergency Permitted Permitted operation Heating Permitted Permitted Capacity that matches Maximum total capacity the total capacity of the of indoor units (Note 1) operable outdoor units Emergency operation pattern (3 outdoor units) OC failure...
Page 116 [ VII Control ] -15- DEMAND Control Cooling/heating operation can be prohibited (Thermo-OFF) by an external input to the indoor units. When DIP SW4-4 is set to ON, the 4-step DEMAND control is enabled. Eight-step demand control is possible in the system with two outdoor units. Twelve-step demand control is possible in the system with three outdoor units.
Page 117: Operation Flow Chart
[ VII Control ] [3] Operation Flow Chart 1. Mode determination flowchart (1) Indoor unit (cooling, heating, dry, fan mode) Start Normal operation Error Breaker Unit in the stopped state turned on From outdoor unit Operation SW turned on 1. Protection function self-holding cancelled.
Page 118 [ VII Control ] (2) Outdoor unit (cooling and heating modes) Start Normal operation Error Breaker Unit in the stopped state turned on "HO" / "PLEASE WAIT" blinks on the remote controller *Note 1 Indoor units registered to the remote controller From indoor unit Operation command...
Page 119 [ VII Control ] 2. Operations in each mode (1) Cooling operation Cooling operation Normal operation During test run mode 4-way valve OFF Unit in the stopped state Indoor unit fan *Note 1 operation Test run mode Thermostat ON 3-minute restart prevention 1.
Page 120 [ VII Control ] (2) Heating operation Normal operation Defrost operation Heating operation Unit in the stopped state *Note 1,2 During test run mode Defrost operation 4-way valve ON 4-way valve OFF 1. Indoor unit fan stops 2. Inverter defrost frequency control Test run mode 3.
Page 121 [ VII Control ] (3) Dry operation Dry operation Normal operation Thermostat ON 4-way valve OFF Unit in the stopped state Test run mode *Note 2 Thermostat ON Suction temperature 18°C[64°F] *Note 1 1. Indoor unit fan stop 1. Outdoor unit (compressor) 2.
Page 122: Test Run Mode
VIII Test Run Mode [1] Items to be checked before a Test Run ................. 115 [2] Test Run Method ......................116 [3] Operating Characteristic and Refrigerant Amount ............117 [4] Adjusting the Refrigerant Amount .................. 117 [5] Refrigerant Amount Adjust Mode................... 120 [6] The following symptoms are normal.
Page 123 - 114 -...
Page 124: Items To Be Checked Before A Test Run
[ VIII Test Run Mode ] VIII Test Run Mode [1] Items to be checked before a Test Run (1) Check for refrigerant leak and loose cables and connectors. (2) Measure the insulation resistance between the power supply terminal block and the ground with a 500V megger and make sure it reads at least 1.0Mohm.
Page 125: Test Run Method
[ VIII Test Run Mode ] [2] Test Run Method The figure shows an MA remote controller (PAR-21MAA). ON/OFF button Set Temperature buttons Down Fan Speed button TIME SUN MON TUE WED THU FRI SAT TIMER AFTER AFTER ERROR CODE FUNCTION FILTER WEEKLY...
Page 126: Operating Characteristic And Refrigerant Amount
[ VIII Test Run Mode ] [3] Operating Characteristic and Refrigerant Amount It is important to have a clear understanding of the characteristics of refrigerant and the operating characteristics of air conditioners before attempting to adjust the refrigerant amount in a given system. 1.
Page 127 [ VIII Test Run Mode ] 3. Amount of refrigerant to be added The amount of refrigerant that is shown in the table below is factory-charged to the outdoor units. The amount necessary for extended pipe (field piping) is not included and must be added on site. Outdoor unit model P120 Amount of pre-charged refrigerant in...
Page 128 [ VIII Test Run Mode ] (2) Example: PUHY-P144Y(T)SHMU-A 9.52 9.52 (3 m) (1 m) 9.52 (10 m) 15.88 (10 m) Liquid separator 9.52 9.52 9.52 9.52 6.35 (10 m) (20 m) (10 m) (10 m) (10 m) 15.88 (30 m) model model model...
Page 129: Refrigerant Amount Adjust Mode
[ VIII Test Run Mode ] [5] Refrigerant Amount Adjust Mode 1. Procedures Follow the procedures below to add or extract refrigerant as necessary depending on the operation mode. When the function switch (SW4-3) on the main board on the outdoor unit (OC only) is turned to ON, the unit goes into the refrigerant amount adjust mode, and the following sequence is followed.
Page 130 [ VIII Test Run Mode ] Start Turn on SW4-3 on the OC. Put all indoor units in the test run mode *Refer to the previous page for *Notes 1-4 in the chart. and run the units in cooling mode. Has the initial start-up mode been completed? Has it been at least...
Page 131: The Following Symptoms Are Normal
[ VIII Test Run Mode ] [6] The following symptoms are normal. Remote controller Symptoms Cause display The indoor unit does not start "Cooling (heating)" The unit cannot perform a heating (cooling) operation when other indoor after starting cooling (heating) icon blinks on the units are performing a cooling (heating) operation.
Page 132: Standard Operation Data (Reference Data)
[ VIII Test Run Mode ] [7] Standard Operation Data (Reference Data) 1. Single unit (1) Cooling operation Outdoor unit model Operation PUHY-P72THMU-A PUHY-P96THMU-A Ambient Indoor 26.7°C/19.4°C [80°F/67°F] 26.7°C/19.4°C [80°F/67°F] tempera- DB/WB Outdoor ture 35°C/ - [95°F/ - ] 35°C/ - [95°F/ - ] No.
Page 133 [ VIII Test Run Mode ] Outdoor unit model Operation PUHY-P120THMU-A Ambient Indoor 26.7°C/19.4°C [80°F/67°F] tempera- DB/WB Outdoor ture 35°C/ - [95°F/ - ] No. of connected units Unit Indoor No. of units in opera- unit tion Operating Model 36/36/36 conditions Main pipe 5 [16-3/8 ]...
Page 134 [ VIII Test Run Mode ] (2) Heating operation Outdoor unit model Operation PUHY-P72THMU-A PUHY-P96THMU-A Ambient Indoor 21.1°C/ - [70°F/ - ] 21.1°C/ - [70°F/ - ] tempera- DB/WB Outdoor ture 8.3°C/6.1°C [47°F/43°F] 8.3°C/6.1°C [47°F/43°F] No. of connected units Unit Indoor No.
Page 135 [ VIII Test Run Mode ] Outdoor unit model Operation PUHY-P120THMU-A Ambient Indoor 21.1°C/ - [70°F/ - ] tempera- DB/WB Outdoor ture 8.3°C/6.1°C [47°F/43°F] No. of connected units Unit Indoor No. of units in opera- unit tion Operating Model 36/36/36 conditions Main pipe 5 [16-3/8 ]...
Page 136 [ VIII Test Run Mode ] 2. 2-unit combination (1) Cooling operation Outdoor unit model Operation PUHY-P144TSHMU-A PUHY-P72THMU-A PUHY-P72THMU-A Ambient Indoor 26.7 °C /19.4 °C [80 °F/67 °F] tempera- DB/WB Outdoor ture 35 °C / - [95 °F/ - ] No.
Page 137 [ VIII Test Run Mode ] Outdoor unit model Operation PUHY-P168TSHMU-A PUHY-P72THMU-A PUHY-P96THMU-A Ambient Indoor 26.7 °C /19.4 °C [80 °F/67 °F] tempera- DB/WB Outdoor ture 35 °C / - [95 °F/ - ] No. of connected units Unit Indoor No.
Page 138 [ VIII Test Run Mode ] Outdoor unit model Operation PUHY-P192TSHMU-A PUHY-P72THMU-A PUHY-P120THMU-A Ambient Indoor 26.7 °C /19.4 °C [80 °F/67 °F] tempera- DB/WB Outdoor ture 35 °C / - [95 °F/ - ] No. of connected units Unit Indoor No.
Page 139 [ VIII Test Run Mode ] Outdoor unit model Operation PUHY-P216TSHMU-A PUHY-P96THMU-A PUHY-P120THMU-A Ambient Indoor 26.7 °C /19.4 °C [80 °F/67 °F] tempera- DB/WB Outdoor ture 35 °C / - [95 °F/ - ] No. of connected units Unit Indoor No.
Page 140 [ VIII Test Run Mode ] Outdoor unit model Operation PUHY-P240TSHMU-A PUHY-P120THMU-A PUHY-P120THMU-A Ambient Indoor 26.7 °C /19.4 °C [80 °F/67 °F] tempera- DB/WB Outdoor ture 35 °C / - [95 °F/ - ] No. of connected units Unit Indoor No.
Page 141 [ VIII Test Run Mode ] (2) Heating operation Outdoor unit model Operation PUHY-P144TSHMU-A PUHY-P72THMU-A PUHY-P72THMU-A Ambient Indoor 21.1°C/ - [70°F/ - ] tempera- DB/WB Outdoor ture 8.3°C/6.1°C [47°F/43°F] No. of connected units Unit Indoor No. of units in opera-...
Page 142 [ VIII Test Run Mode ] Outdoor unit model Operation PUHY-P168TSHMU-A PUHY-P72THMU-A PUHY-P96THMU-A Ambient Indoor 21.1°C/ - [70°F/ - ] tempera- DB/WB Outdoor ture 8.3°C/6.1°C [47°F/43°F] No. of connected units Unit Indoor No. of units in opera- unit tion Operating...
Page 143 [ VIII Test Run Mode ] Outdoor unit model Operation PUHY-P192TSHMU-A PUHY-P72THMU-A PUHY-P120THMU-A Ambient Indoor 21.1°C/ - [70°F/ - ] tempera- DB/WB Outdoor ture 8.3°C/6.1°C [47°F/43°F] No. of connected units Unit Indoor No. of units in opera- unit tion Operating...
Page 144 [ VIII Test Run Mode ] Outdoor unit model Operation PUHY-P216TSHMU-A PUHY-P96THMU-A PUHY-P120THMU-A Ambient Indoor 21.1°C/ - [70°F/ - ] tempera- DB/WB Outdoor ture 8.3°C/6.1°C [47°F/43°F] No. of connected units Unit Indoor No. of units in opera- unit tion Operating Model 06/36/36/36/48/48 conditions...
Page 145 [ VIII Test Run Mode ] Outdoor unit model Operation PUHY-P240TSHMU-A PUHY-P120THMU-A PUHY-P120THMU-A Ambient Indoor 21.1°C/ - [70°F/ - ] tempera- DB/WB Outdoor ture 8.3°C/6.1°C [47°F/43°F] No. of connected units Unit Indoor No. of units in opera- unit tion Operating Model 18/36/36/36/48/48 conditions...
Page 146 [ VIII Test Run Mode ] 3. 3-unit combination (1) Cooling operation Outdoor unit model PUHY-P264TSHMU-A Operation PUHY- PUHY-P72THMU-A PUHY-P72THMU-A P120THMU-A Ambient Indoor 26.7°C/19.4°C [80°F/67°F] tempera- DB/WB Outdoor ture 35°C/ - [95°F/ - ] No. of connected units Unit Indoor No.
Page 147 [ VIII Test Run Mode ] Outdoor unit model PUHY-P288TSHMU-A Operation PUHY- PUHY-P72THMU-A PUHY-P96THMU-A P120THMU-A Ambient Indoor 26.7°C/19.4°C [80°F/67°F] tempera- DB/WB Outdoor ture 35°C/ - [95°F/ - ] No. of connected units Unit Indoor No. of units in opera- unit...
Page 148 [ VIII Test Run Mode ] Outdoor unit model PUHY-P312TSHMU-A Operation PUHY- PUHY- PUHY-P72THMU-A P120THMU-A P120THMU-A Ambient Indoor 26.7°C/19.4°C [80°F/67°F] tempera- DB/WB Outdoor ture 35°C/ - [95°F/ - ] No. of connected units Unit Indoor No. of units in opera-...
Page 149 [ VIII Test Run Mode ] Outdoor unit model PUHY-P336TSHMU-A Operation PUHY- PUHY- PUHY-P96THMU-A P120THMU-A P120THMU-A Ambient Indoor 26.7°C/19.4°C [80°F/67°F] tempera- DB/WB Outdoor ture 35°C/ - [95°F/ - ] No. of connected units Unit Indoor No. of units in opera- unit tion Operating...
Page 150 [ VIII Test Run Mode ] Outdoor unit model PUHY-P360TSHMU-A Operation PUHY- PUHY- PUHY- P120THMU-A P120THMU-A P120THMU-A Ambient Indoor 26.7°C/19.4°C [80°F/67°F] tempera- DB/WB Outdoor ture 35°C/ - [95°F/ - ] No. of connected units Unit Indoor No. of units in opera- unit tion Operating...
Page 151 [ VIII Test Run Mode ] (2) Heating operation Outdoor unit model PUHY-P264TSHMU-A Operation PUHY- PUHY-P72THMU-A PUHY-P72THMU-A P120THMU-A Ambient Indoor 21.1°C/ - [70°F/ - ] tempera- DB/WB Outdoor ture 8.3°C/6.1°C [47°F/43°F] No. of connected units Unit Indoor No. of units in opera-...
Page 152 [ VIII Test Run Mode ] Outdoor unit model PUHY-P288TSHMU-A Operation PUHY- PUHY-P72THMU-A PUHY-P96THMU-A P120THMU-A Ambient Indoor 21.1°C/ - [70°F/ - ] tempera- DB/WB Outdoor ture 8.3°C/6.1°C [47°F/43°F] No. of connected units Unit Indoor No. of units in opera- unit...
Page 153 [ VIII Test Run Mode ] Outdoor unit model PUHY-P312TSHMU-A Operation PUHY- PUHY- PUHY-P72THMU-A P120THMU-A P120THMU-A Ambient Indoor 21.1°C/ - [70°F/ - ] tempera- DB/WB Outdoor ture 8.3°C/6.1°C [47°F/43°F] No. of connected units Unit Indoor No. of units in opera-...
Page 154 [ VIII Test Run Mode ] Outdoor unit model PUHY-P336TSHMU-A Operation PUHY- PUHY- PUHY-P96THMU-A P120THMU-A P120THMU-A Ambient Indoor 21.1°C/ - [70°F/ - ] tempera- DB/WB Outdoor ture 8.3°C/6.1°C [47°F/43°F] No. of connected units Unit Indoor No. of units in opera- unit tion Operating...
Page 155 [ VIII Test Run Mode ] Outdoor unit model PUHY-P360TSHMU-A Operation PUHY- PUHY- PUHY- P120THMU-A P120THMU-A P120THMU-A Ambient Indoor 21.1°C/ - [70°F/ - ] tempera- DB/WB Outdoor ture 8.3°C/6.1°C [47°F/43°F] No. of connected units Unit Indoor No. of units in opera- unit tion Operating...
Page 156: Troubleshooting
IX Troubleshooting [1] Error Code Lists ......................149 [2] Responding to Error Display on the Remote Controller..........152 [3] Investigation of Transmission Wave Shape/Noise............231 [4] Troubleshooting Principal Parts ..................234 [5] Refrigerant Leak ......................265 [6] Compressor Replacement Instructions................267 [7] Troubleshooting Using the Outdoor Unit LED Error Display..........
Page 157 - 148 -...
Page 158: Error Code Lists
[ IX Troubleshooting ] IX Troubleshooting [1] Error Code Lists Searched unit Error Prelimi- (prelim- Error nary Error code definition Notes inary) Code error detail code code 4300 0403 Serial communication error 4305 (Note) 0900 Test run 1102 1202 Discharge temperature fault 1301 Low pressure fault 1302...
Page 159 [ IX Troubleshooting ] Searched unit Error Prelimi- (prelim- Error nary inary) Error code definition Notes Code error detail code code Indoor unit pipe tempera- ture (TH22) Temperature sensor OA processing unit pipe 5102 1217 fault temperature (TH2) HIC bypass circuit outlet temperature (TH2) Indoor unit gas-side pipe temperature (TH23)
Page 160 [ IX Troubleshooting ] Searched unit Error Prelimi- (prelim- Error nary inary) Error code definition Notes Code error detail code code 6608 No response error MA controller signal reception error (No signal re- 6831 ception) MA remote controller signal transmission error 6832 (Synchronization error) MA remote controller signal transmission error...
Page 161: Responding To Error Display On The Remote Controller
[ IX Troubleshooting ] [2] Responding to Error Display on the Remote Controller 1. Error Code 0403 (THMU-A) Serial communication error 2. Error definition and error detection method Serial communication error between the control board and the INV board on the compressor, and between the control board and the Fan board Detail code 01: Between the control board and the INV board Detail code 05: Between the control board and the Fan board...
Page 162 [ IX Troubleshooting ] 1. Error Code 0403 (YHMU-A) Serial communication error 2. Error definition and error detection method Serial communication error between the control board and the INV board on the compressor, and between the control board and the Fan board Detail code 01: Between the control board and the INV board Detail code 05: Between the control board and the Fan board 3.
Page 163 [ IX Troubleshooting ] 1. Error Code 1102 Discharge temperature fault 2. Error definition and error detection method 1) If the discharge temperature of 120 °C [248°F] or more is detected during the above operation (the first detection), the outdoor unit stops once, turns to anti-restart mode for 3 minutes, and restarts after 3 minutes automatically.
Page 164 [ IX Troubleshooting ] 1. Error Code 1301 Low pressure fault 2. Error definition and error detection method When starting the compressor from Stop Mode for the first time if low pressure reads 0.098MPa [14psi] immediately before start-up, the operation immediately stops. 3.
Page 165 [ IX Troubleshooting ] 1. Error Code 1302 High pressure fault 1 (Outdoor unit) 2. Error definition and error detection method 1) If the pressure of 3.78MPa [548psi] or higher is detected by the pressure sensor during operation (the first detection), the out- door stops once, turns to antirestart mode for 3 minutes, and restarts after 3 minutes automatically.
Page 166 [ IX Troubleshooting ] 1. Error Code 1302 High pressure fault 2 (Outdoor unit) 2. Error definition and error detection method If the pressure of 0.098MPa [14psi] or lower is registered on the pressure sensor immediately before start-up, it will trigger an abnormal stop, and error code "1302"...
Page 167 [ IX Troubleshooting ] 1. Error Code 2500 Drain sensor submergence (Models with a drain sensor) 2. Error definition and error detection method 1) If an immersion of the drain sensor in the water is detected while the unit is in any mode other than the Cool/Dry mode and when the drain pump goes from OFF to ON, this condition is considered preliminary water leakage.
Page 168 [ IX Troubleshooting ] 1. Error Code 2500 Drain sensor submergence (Models with a float switch) 2. Error definition and error detection method 1) If an immersion of the float switch in the water is detected while the unit is in any mode other than the Cool/Dry mode and when the drain pump goes from OFF to ON, this condition is considered preliminary water leakage.
Page 169 [ IX Troubleshooting ] 1. Error Code 2502 Drain pump fault (Models with a drain sensor) 2. Error definition and error detection method 1) Make the drain sensor thermistor self-heat. If the temperature rise is small, it is interpreted that the sensor is immersed in water.
Page 170 [ IX Troubleshooting ] 1. Error Code 2502 Drain pump fault (Models with a float switch) 2. Error definition and error detection method 1) The immersion of sensor tip in water is detected by the ON/OFF signal from the float switch. Submergence of the sensor When it is detected that the float switch has been ON for 15 seconds, it is interpreted that the sensor tip is immersed in water.
Page 171 [ IX Troubleshooting ] 1. Error Code 2503 Drain sensor (Thd) fault 2. Error definition and error detection method If the open or short circuit of the thermistor has been detected for 30 seconds, this condition is considered to be a preliminary error, and the unit goes into the 3-minute restart delay mode.
Page 172 [ IX Troubleshooting ] 1. Error Code 2600 Water leakage 2. Cause, check method and remedy Check that water does not leak from the pipes in such as the humidifier. 1. Error Code 2601 Water supply cutoff 2. Cause, check method and remedy Cause Check method and remedy The water tank of the humidifier is empty.
Page 173 [ IX Troubleshooting ] 1. Error Code 4102 (THMU-A) Open phase 2. Error definition and error detection method An open phase of the power supply (L1 phase, L2 phase) was detected at power on. The L3 phase current is outside of the specified range. The open phase of the power supply may not always be detected if a power voltage from another circuit is applied.
Page 174 [ IX Troubleshooting ] 1. Error Code 4102 (YHMU-A) Open phase 2. Error definition and error detection method An open phase of the power supply (L1 phase, L2 phase) was detected at power on. The L3 phase current is outside of the specified range. The open phase of the power supply may not always be detected if a power voltage from another circuit is applied.
Page 175 [ IX Troubleshooting ] 1. Error Code 4106 <Transmission power supply fault error detail FF (Outdoor unit)> 2. Error definition and error detection method Transmission power output failure 3. Cause 1) Wiring failure 2) Transmission power supply cannot output voltage because overcurrent was detected. 3) Voltage cannot be output due to transmission power supply problem.
Page 176 [ IX Troubleshooting ] 1. Error Code (THMU-A) 4115 Power supply signal sync error 2. Error definition and error detection method The frequency cannot be determined when the power is switched on. 3. Cause, check method and remedy Cause Check method and remedy Power supply error Check the voltage of the power supply terminal block (TB1).
Page 177 [ IX Troubleshooting ] 1. Error Code 4116 RPM error/Motor error 2. Error definition and error detection method LOSSNAY The motor keep running even if the power is OFF. The thermal overload relay is ON. (Only for the three-phase model) Indoor unit If detected less than 180rpm or more than 2000rpm, the indoor unit will restart and keep running for 3 minutes.If detected again, the display will appear.
Page 178 [ IX Troubleshooting ] 1. Error Code 4220 (THMU-A) 4225 Abnormal bus voltage drop (Detail code 108) 2. Error definition and error detection method If Vdc 160V or less is detected during Inverter operation. (S/W detection) 3. Cause, check method and remedy (1) Power supply environment Check whether the unit makes an instantaneousstop when the detection result is abnormal or a power failure occurs.
Page 179 [ IX Troubleshooting ] 1. Error Code 4220 (YHMU-A) 4225 Abnormal bus voltage drop (Detail code 108) 2. Error definition and error detection method If Vdc 289V or less is detected during Inverter operation. (S/W detection) 3. Cause, check method and remedy (1) Power supply environment Check whether the unit makes an instantaneous stop when the detection result is abnormal or a power failure occurs.
Page 180 [ IX Troubleshooting ] 1. Error Code 4220 (THMU-A) 4225 Abnormal bus voltage rise (Detail code 109) 2. Error definition and error detection method If Vdc 400V is detected during inverter operation. 3. Cause, check method and remedy (1) Different voltage connection Check the power supply voltage on the power supply terminal block (TB1).
Page 181 [ IX Troubleshooting ] 1. Error Code 4220 (THMU-A) (P120 model) 4225 VDC error (Detail code 110) 2. Error definition and error detection method Bus voltage abnormality If Vdc 400V or Vdc 160V is detected. (H/W detection) 3. Cause, check method and remedy Same as detail code No.108 and 109 of 4220 error Refer to section -6- "Inverter (THMU-A)"...
Page 182 [ IX Troubleshooting ] 1. Error Code 4220 (THMU-A) 4225 Logic error (Detail code 111) 2. Error definition and error detection method H/W error If only the H/W error logic circuit operates, and no identifiable error is detected. 3. Cause, Check method and remedy In the case of 4220 Cause Check method and remedy...
Page 183 [ IX Troubleshooting ] 1. Error Code 4220 (YHMU-A) 4225 Logic error (Detail code 111) 2. Error definition and error detection method H/W error If only the H/W error logic circuit operates, and no identifiable error is detected. 3. Cause, Check method and remedy In the case of 4220 Cause Check method and remedy...
Page 184 [ IX Troubleshooting ] 1. Error Code 4230 (THMU-A) Heatsink overheat protection 2. Error definition and error detection method When the heat sink temperature (THHS) remains at or above TOH is detected. Model P72, P96 models 100°C [212°F] P120 model 90°C [194°F] 3.
Page 185 [ IX Troubleshooting ] 1. Error Code 4230 (YHMU-A) Heatsink overheat protection 2. Error definition and error detection method When the heat sink temperature (THHS) remains at or above 100°C [212°F] is detected. 3. Cause, check method and remedy Cause Check method and remedy Fan board failure Refer to IX [4] -6- (2) [6].(page 255)
Page 186 [ IX Troubleshooting ] 1. Error Code 4240 (THMU-A) Overload protection 2. Error definition and error detection method If the output current of "(Iac) >Imax (Arms)" or "THHS > TOL" is continuously detected for 10 minutes or more during inverter operation.
Page 187 [ IX Troubleshooting ] 1. Error Code 4240 (YHMU-A) Overload protection 2. Error definition and error detection method If the output current of "(Iac) >Imax (Arms)" or "THHS > 95°C [203°F] " is continuously detected for 10 minutes or more during inverter operation.
Page 188 [ IX Troubleshooting ] 1. Error Code 4250 (THMU-A) 4255 IPM error (Detail code 101) 2. Error definition and error detection method In the case of 4250 P72, P96 models Overcurrent is detected by the overcurrent detection resistor (RSH) on the INVboard. P120 model IPM error signal is detected.
Page 189 [ IX Troubleshooting ] 1. Error Code 4250 (YHMU-A) 4255 IPM error (Detail code 101) 2. Error definition and error detection method In the case of 4250 Overcurrent is detected by the overcurrent detection resistor (RSH) on the INV board. In the case of 4255 IPM error signal is detected.
Page 190 [ IX Troubleshooting ] 1. Error Code 4250 (THMU-A) ACCT overcurrent (H/W detection) (Detail code 102) DCCT overcurrent (H/W detection) (Detail code 103) Instantaneous overcurrent (Detail code 106) Overcurrent (Detail code 107) 2. Error definition and error detection method P76 and P96 models Overcurrent 88 Apeak or 42 Arms and above is detected by the current sensor.
Page 191 [ IX Troubleshooting ] 1. Error Code 4250 (YHMU-A) Instantaneous overcurrent (Detail code 106) Overcurrent (Detail code 107) 2. Error definition and error detection method P72 and P96 models Overcurrent 94 Apeak or 22 Arms and above is detected by the current sensor. P120 model Overcurrent 94 Apeak or 35 Arms and above is detected by the current sensor.
Page 192 [ IX Troubleshooting ] 1. Error Code 4250 4255 Overcurrent error due to short-circuited motor (Detail code 105) 2. Error definition and error detection method When a short is detected on the load side just before starting the inverter operation. 3.
Page 193 [ IX Troubleshooting ] 1. Error Code 5101 Return air temperature sensor (TH21) fault (Indoor unit) Return air temperature sensor (TH4) fault (OA processing unit) 5102 Pipe temperature sensor (TH22) fault (Indoor unit) Pipe temperature sensor (TH2) fault (OA processing unit) 5103 Gas-side pipe temperature sensor (TH23) fault (Indoor unit) Gas-side pipe temperature sensor (TH3) fault (OA processing unit)
Page 194 [ IX Troubleshooting ] 1. Error Code 5102 HIC bypass circuit outlet temperature sensor (TH2) fault (Outdoor unit) 5103 Heat exchanger outlet temperature sensor (TH3) fault (Outdoor unit) 5104 Discharge temperature sensor (TH4) fault (Outdoor unit) 5105 Accumulator inlet temperature sensor (TH5) fault (Outdoor unit) 5106 HIC circuit outlet temperature sensor (TH6) fault (Outdoor unit) 5107...
Page 195 [ IX Troubleshooting ] 1. Error Code 5110 (THMU-A) (P120 model only) Heatsink temperature sensor (THHS) fault (Detail code 01) 2. Error definition and error detection method When a short or an open of THHS is detected just before or during the inverter operation. 3.
Page 196 [ IX Troubleshooting ] 1. Error Code 5110 (YHMU-A) Heatsink temperature sensor (THHS) fault (Detail code 01) 2. Error definition and error detection method When a short or an open of THHS is detected just before or during the inverter operation. 3.
Page 197 [ IX Troubleshooting ] 1. Error Code 5301 (THMU-A) ACCT sensor fault (Detail code 115) 2. Error definition and error detection method When the formula "output current < 2 Arms" remains satisfied for 10 seconds while the inverter is in operation. 3.
Page 198 [ IX Troubleshooting ] 1. Error Code 5301 (YHMU-A) ACCT sensor fault (Detail code 115) 2. Error definition and error detection method When the formula "output current < 1.5 Arms" remains satisfied for 10 seconds while the inverter is in operation. 3.
Page 199 [ IX Troubleshooting ] 1. Error Code 5301 (THMU-A) (P120 model only) DCCT sensor circuit fault (Detail code118) 2. Error definition and error detection method When an error value is detected with the DCCT detection circuit just before the inverter starts 3.
Page 200 [ IX Troubleshooting ] 1. Error Code 5301 (YHMU-A) Open-circuited IPM/Loose ACCT connector (Detail code 119) 2. Error definition and error detection method Presence of enough current cannot be detected during the self-diagnostic operation immediately before inverter startup. 3. Cause, check method and remedy Cause Check method and remedy Inverter output wiring problem...
Page 201 [ IX Troubleshooting ] 1. Error Code 5301 (YHMU-A) Faulty ACCT wiring (Detail code 120) 2. Error definition and error detection method Presence of target current cannot be detected during the self-diagnostic operation immediately before startup. 3. Cause, check method and remedy Cause Check method and remedy Inverter output wiring problem...
Page 202 [ IX Troubleshooting ] 1. Error Code 5701 Loose float switch connector 2. Error definition and error detection method Detection of the disconnected float switch (open-phase condition) during operation 3. Cause, check method and remedy (1) CN4F disconnection or contact failure Check for disconnection of the connector (CN4F) on the indoor unit control board.
Page 203 [ IX Troubleshooting ] 1. Error Code 6600 Address overlap 2. Error definition and error detection method An error in which signals from more than one indoor units with the same address are received The address and attribute that appear on the remote controller indicate the controller that detected the error. 3.
Page 204 [ IX Troubleshooting ] 1. Error Code 6602 Transmission processor hardware error 2. Error definition and error detection method Although "0" was surely transmitted by the transmission processor, "1" is displayed on the transmission line. The address/attribute appeared on the display on the remote controller indicates the controller where an error oc- curred.
Page 205 [ IX Troubleshooting ] 1. Error Code 6603 Transmission line bus busy error 2. Error definition and error detection method Generated error when the command cannot be transmitted for 4-10 minutes in a row due to bus-busy Generated error when the command cannot be transmitted to the transmission line for 4-10 minutes in a row due to noise The address/attribute appeared on the display on the remote controller indicates the controller where an error oc- curred.
Page 206 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
Page 207 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
Page 208 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
Page 209 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
Page 210 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
Page 211 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
Page 212 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
Page 213 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
Page 214 [ IX Troubleshooting ] 1. Error Code 6608 No response error 2. Error definition and error detection method When no response command is returned although acknowledgement (ACK) is received after transmission, an error is detect- When the data is transmitted 10 times in a row with 3 seconds interval, an error is detected on the transmission side. The address/attribute appeared on the display on the remote controller indicates the controller where an error oc- curred.
Page 215 [ IX Troubleshooting ] 1. Error Code 6831 MA controller signal reception error (No signal reception) 2. Error definition and error detection method Communication between the MA remote controller and the indoor unit is not done properly. No proper data has been received for 3 minutes. 3.
Page 216 [ IX Troubleshooting ] 1. Error Code 6832 MA remote controller signal transmission error (Synchronization error) 2. Error definition and error detection method MA remote controller and the indoor unit is not done properly. Failure to detect opening in the transmission path and unable to send signals Indoor unit : 3 minutes Remote controller : 6 seconds 3.
Page 217 [ IX Troubleshooting ] 1. Error Code 6833 MA remote controller signal transmission error (Hardware error) 2. Error definition and error detection method Communication between the MA remote controller and the indoor unit is not done properly. An error occurs when the transmitted data and the received data differ for 30 times in a row. 3.
Page 218 [ IX Troubleshooting ] 1. Error Code 6834 MA controller signal reception error (Start bit detection error) 2. Error definition and error detection method Communication between the MA remote controller and the indoor unit is not done properly. No proper data has been received for 2 minutes. 3.
Page 219 [ IX Troubleshooting ] 1. Error Code 7100 Total capacity error 2. Error definition and error detection method The model total of indoor units in the system with one outdoor unit exceeds limitations. 3. Error source, cause, check method and remedy, Error source Cause Check method and remedy...
Page 220 [ IX Troubleshooting ] 1. Error Code 7101 Capacity code setting error 2. Error definition and error detection method Connection of incompatible (wrong capacity code) indoor unit or outdoor unit 3. Error source, cause, check method and remedy Error source Cause Check method and remedy Outdoor unit...
Page 221 [ IX Troubleshooting ] 1. Error Code 7102 Wrong number of connected units 2. Error definition and error detection method The number of connected indoor units is "0" or exceeds the allowable value. 3. Error source, cause, check method and remedy Error source Cause Check method and remedy...
Page 222 [ IX Troubleshooting ] 1. Error Code 7105 Address setting error 2. Error definition and error detection method Erroneous setting of OC unit address 3. Cause, check method and remedy Error source Cause Check method and remedy Outdoor unit Erroneous setting of OC unit address Check that the address of OC unit is set to 51- The address of outdoor unit is not being set to 51 - 100.
Page 223 [ IX Troubleshooting ] 1. Error Code 7110 Connection information signal transmission/reception error 2. Error definition and error detection method The given indoor unit is inoperable because it is not properly connected to the outdoor unit in the same system. 3.
Page 224 [ IX Troubleshooting ] 1. Error Code 7113 Function setting error (incorrect resistor connection) 2. Error source, cause, check method and remedy Error source Cause Check method and remedy Outdoor unit Wiring fault (Detail code 15) Loose connectors, short-circuit, con- Check the connector CNTYP5 on the control board for tact failure proper connection.
Page 225 [ IX Troubleshooting ] 1. Error Code 7117 Model setting error 2. Error source, cause, check method and remedy Error source Cause Check method and remedy Outdoor unit Wiring fault (Detail code 15) Loose connectors, short-circuit, con- Check the connector CNTYP5 on the control board for tact failure proper connection.
Page 226 [ IX Troubleshooting ] 1. Error Code 7130 Incompatible unit combination 2. Error definition and error detection method The check code will appear when the indoor units with different refrigerant systems are connected. 3. Error source, cause, check method and remedy Error source Cause Check method and remedy...
Page 227 [ IX Troubleshooting ] -1- Troubleshooting according to the remote controller malfunction or the external input error In the case of MA remote controller 1. Phenomena Even if the operation button on the remote controller is pressed, the display remains unlit and the unit does not start run- ning.(Power indicator does not appear on the screen.) (1) Cause...
Page 228 [ IX Troubleshooting ] In the case of MA remote controller 2. Phenomena When the remote controller operation SW is turned on, the operation status briefly appears on the display, then it goes off, and the display lights out immediately, and the unit stops. (1) Cause 1) The power for the M-NET transmission line is not supplied from the outdoor unit.
Page 229 [ IX Troubleshooting ] In the case of MA remote controller 3. Phenomena "HO" or "PLEASE WAIT" display on the remote controller does not disappear, and no operation is performed even if the button is pressed. ("HO" or "PLEASE WAIT" display will normally turn off 5 minutes later after the power on.) (1) Cause 1) The power for the M-NET transmission line is not supplied from the outdoor unit.
Page 230 [ IX Troubleshooting ] Flow chart Even if the operation button on the remote controller is pressed, the indoor and the outdoor units do not start running. HWE08040 - 221 -...
Page 231 [ IX Troubleshooting ] In case of M-NET remote controller 1. Phenomena Even if the operation button on the remote controller is pressed, the display remains unlit and the unit does not start running. (Power indicator does not appear on the screen.) (1) Cause 1) The power for the M-NET transmission line is not supplied from the outdoor unit.
Page 232 [ IX Troubleshooting ] In case of M-NET remote controller 2. Phenomena When the remote controller operation SW is turned on, a temporary operation display is indicated, and the display lights out immediately. (1) Cause 1) The power is not supplied to the indoor unit. The main power of the indoor unit (AC208/230V) is not on.
Page 233 [ IX Troubleshooting ] In case of M-NET remote controller 3. Phenomena "HO" display on the remote controller does not disappear, and no operation is performed even if the button is pressed. (1) Cause Without using MELANS 1) Outdoor unit address is set to "00" 2) A wrong address is set.
Page 234 [ IX Troubleshooting ] In case of M-NET remote controller 4. Phenomena "88" appears on the remote controller when the address is registered or confirmed. (1) Cause, check method and remedy Cause Check method and remedy An error occurs when the address is registered or con- firmed.
Page 235 [ IX Troubleshooting ] Both for MA remote controller and M-NET remote controller 1. Phenomena Although cooling operation starts with the normal remote controller display, the capacity is not enough (1) Cause, check method and remedy Cause Check method and remedy Compressor frequency does not rise sufficiently.
Page 236 [ IX Troubleshooting ] Cause Check method and remedy Long piping length Check the piping length to determine if it is contrib- The cooling capacity varies greatly depending on the uting to performance loss. pressure loss. (When the pressure loss is large, the Piping pressure loss can be estimated from the cooling capacity drops.) temperature difference between the indoor unit...
Page 237 [ IX Troubleshooting ] 2. Phenomena Although heating operation starts with the normal remote controller display, the capacity is not enough. (1) Cause, check method and remedy Cause Check method and remedy Compressor frequency does not rise sufficiently. Check pressure difference between the detected pressure by the pressure sensor and the actual Faulty detection of pressure sensor.
Page 238 [ IX Troubleshooting ] Cause Check method and remedy Indoor unit LEV malfunction Refer to the page of LEV troubleshooting ([4] -5- Insufficient refrigerant flows due to LEV malfunction ).(page 238) (not enough opening). Temperature reading error on the indoor unit piping Check the thermistor.
Page 239 [ IX Troubleshooting ] 3. Phenomena Outdoor unit stops at times during operation. (1) Cause, check method and remedy Cause Check method and remedy The first stop is not considered as an error, as the Check the mode operated in the past by displaying unit turns to anti-restart mode for 3 minutes as a pre- preliminary error history on LED display with SW1.
Page 240: Investigation Of Transmission Wave Shape/Noise
[ IX Troubleshooting ] [3] Investigation of Transmission Wave Shape/Noise 1. M-NET transmission Control is performed by exchanging signals between the outdoor unit and the indoor unit (M-NET remote controller) through M-NET transmission. Noise interference on the transmission line will interrupt the normal transmission, leading to erroneous operation.
Page 241 [ IX Troubleshooting ] (3) Check method and remedy 1) Measures against noise Check the followings when noise exists on the wave or the errors described in (1) occur. Error code definition Remedy Check that the wiring 1. The transmission line and Isolate the transmission line from the power line (5cm [1-31/32"] or work is performed ac- the power line are not...
Page 242 [ IX Troubleshooting ] 2. MA remote controller transmission The communication between the MA remote controller and the indoor unit is performed with current tone burst. (1) Symptoms caused by noise interference on the transmission line If noise is generated on the transmission line, and the communication between the MA remote controller and the indoor unit is interrupted for 3 minutes in a row, MA transmission error (6831) will occur.
Page 243: Troubleshooting Principal Parts
[ IX Troubleshooting ] [4] Troubleshooting Principal Parts -1- High-Pressure Sensor (63HS1) 1. Compare the pressure that is detected by the high pressure sensor, and the high-pressure gauge pressure to check for failure. By configuring the digital display setting switch (SW1) as shown in the figure below, the pressure as measured by the high- pressure sensor appears on the LED1 on the control board.
Page 244 [ IX Troubleshooting ] -2- Low-Pressure Sensor (63LS) 1. Compare the pressure that is detected by the low pressure sensor, and the low pressure gauge pressure to check for failure. By configuring the digital display setting switch (SW1) as shown in the figure below, the pressure as measured by the low- pressure sensor appears on the LED1 on the control board.
Page 245 [ IX Troubleshooting ] -3- Solenoid Valve Check whether the output signal from the control board and the operation of the solenoid valve match. Setting the self-diagnosis switch (SW1) as shown in the figure below causes the ON signal of each relay to be output to the LED's. Each LED shows whether the relays for the following parts are ON or OFF.
Page 246 [ IX Troubleshooting ] (3) In case of SV1a (Bypass valve) This solenoid valve opens when powered (Relay ON). 1) At compressor start-up, the SV1a turns on for 4 minutes, and the operation can be checked by the self-diagnosis LED display and the closing sound.
Page 247 [ IX Troubleshooting ] -5- LEV LEV operation LEV (Indoor unit: Linear expansion valve), LEV2a, and LEV2b (Outdoor unit: Linear expansion valve) are stepping-motor-driv- en valves that operate by receiving the pulse signals from the indoor and outdoor unit control boards. (1) Indoor LEV and Outdoor LEV (LEV2a, LEV2b) The valve opening changes according to the number of pulses.
Page 248 [ IX Troubleshooting ] (2) Outdoor LEV (LEV1) The valve opening changes according to the number of pulses. 1) Connections between the outdoor control board and LEV1 (outdoor expansion valve) Outdoor control board DC 12V Brown Drive circuit Blue Orange Yellow White 2) Pulse signal output and valve operation...
Page 249 [ IX Troubleshooting ] (3) Judgment methods and possible failure mode The specifications of the outdoor unit (outdoor LEV) and the indoor unit (indoor LEV) differ.Therefore, remedies for each failure may vary. Check the remedy specified for the appropriate LEV as indicated in the right column. Malfunction Judgment method Remedy...
Page 250 [ IX Troubleshooting ] (4) Outdoor unit LEV (LEV1) coil removal procedure 1) LEV component As shown in the figure, the outdoor LEV is made in such a way that the coils and the body can be separated. Body Coils Stopper Lead wire 2) Removing the coils...
Page 251 [ IX Troubleshooting ] (5) Outdoor unit LEV (LEV2a,2b) coil removal procedure Motor Driver Locknut Bellows Valve assembling Refrigerant Circuit Valve body side Orifice Notes on the procedure 1) Do not put undue pressure on the motor. 2) Do not use motors if dropped. 3) Do not remove the cap until immediately before the procedure.
Page 252 [ IX Troubleshooting ] Replacement procedure 1) Stop the air conditioner. After checking that the air conditioner is stopped, turn off the power of the outdoor unit. 2) Prepare two spanners. Hold the valve body with one spanner and loosen the locknut with another one. Turning the locknut counter-clockwise from motor side view can loosen it.
Page 253 [ IX Troubleshooting ] [THMU-A] -6- Inverter (THMU-A) Replace only the compressor if only the compressor is found to be defective. (Overcurrent will flow through the inverter if the compressor is damaged, however, the power supply is automatically cut when overcurrent is detected, protecting the inverter from damage.) Replace only the fan motor if only the fan motor is found to be defective.
Page 254 [ IX Troubleshooting ] [THMU-A] Error display/failure condition Measure/inspection item Inverter related errors Check the details of the inverter error in the error log at 10.[1] Table of 4250, 4255, 4220, 4225, 4230, 4240,4260, 5301, 0403 LED codes. Take appropriate measures to the error code and the error details in ac- cordance with 9.
Page 255 [ IX Troubleshooting ] [THMU-A] (2) Inverter output related troubles Items to be checked Phenomena Remedy <P72 and P96 models> IPM/overcurrent breaker trip Replace the INV board. Check the INV Error code: 4250 Detail code: No. 101, 104, 105, 106, board error detection cir- and 107...
Page 256 [ IX Troubleshooting ] [THMU-A] Items to be checked Phenomena Remedy <P72 and P96 models> Inverter-related problems are de- Connect the short-circuit con- Check whether tected. nector to CN6, and go to sec- the inverter is tion [1]. damaged. Disconnect the inverter Inverter voltage is not output.
Page 257 [ IX Troubleshooting ] [THMU-A] (3) Trouble treatment when the main power breaker is tripped. Items to be checked Phenomena Remedy Perform Meg check between the Zero to several ohm, or Meg failure Check each part in the main inverter terminals on the power terminal circuit.
Page 258 [ IX Troubleshooting ] [THMU-A] (4) Simple checking procedure for individual components of main inverter circuit Before checking, turn the power off and remove the parts to be checked from the control box. Part name Judgment method Diode stack Refer to "Diode stack" ( 9 [2] - 6 - (6) ) IPM (Intelligent Refer to "Intelligent power module (IPM)"...
Page 259 [ IX Troubleshooting ] [THMU-A] (5) Intelligent power module (P120 model) Measure resistances between each pair of terminals on the IPM with a tester, and use the results for troubleshooting. 1) Notes on measurement Check the polarity before measuring. (On the tester, black normally indicates plus.) Check that the resistance is not open ( ohm) or not shorted (to 0 ohm).
Page 260 [ IX Troubleshooting ] [THMU-A] (6) Diode stack (P120 model) Measure resistances between each pair of terminals on the diode stack with a tester, and use the results for troubleshoot- ing.Refer to (5) " Intelligent power module (IPM) " for notes on measurement and tester selection. Judgment value (reference) Black ( + ) External view...
Page 261 [ IX Troubleshooting ] [YHMU-A] -6- Inverter (YHMU-A) Replace only the compressor if only the compressor is found to be defective. Replace only the fan motor if only the fan motor is found to be defective. Replace the defective components if the inverter is found to be defective. If both the compressor and the inverter are found to be defective, replace the defective component(s) of both devices.
Page 262 [ IX Troubleshooting ] [YHMU-A] Error display/failure condition Measure/inspection item Inverter related errors Check the details of the inverter error in the error log at 10.[1] Table of 4250, 4255, 4220, 4225, 4230, 4240,4260, 5301, 0403 LED codes. Take appropriate measures to the error code and the error details in ac- cordance with 9.
Page 263 [ IX Troubleshooting ] [YHMU-A] (2) Inverter output related troubles Items to be checked Phenomena Remedy Disconnect the invert- Overcurrent error Replace the INV board. Check the er output wire from Error code: 4250 the terminals of the Detail code: No. 101, 104, 105, INV board er- ror detection INV board (SC-U,...
Page 264 [ IX Troubleshooting ] [YHMU-A] Items to be checked Phenomena Remedy Disconnect the inverter Inverter-related problems are de- Connect the short-circuit con- Check whether output wire from the ter- tected. nector to CN6, and go to sec- the inverter is minals of the INV board tion [1].
Page 265 [ IX Troubleshooting ] [YHMU-A] (3) Trouble treatment when the main power breaker is tripped Items to be checked Phenomena Remedy Check the breaker capacity. Use of a non-specified break- Replace it with a specified breaker. Perform Meg check between the Zero to several ohm, or Meg Check each part and wiring.
Page 266 [ IX Troubleshooting ] [YHMU-A] (5) Simple checking procedure for individual components of main inverter circuit Before inspecting the inside of the control box, turn off the power, keep the unit off for at least 10 minutes, and confirm that the voltage between FT-P and FT-N on INV Board has dropped to DC20V or less.
Page 267 [ IX Troubleshooting ] [YHMU-A] Judgment value (reference) Black ( + ) SC-P1 FT-N SC-L1 SC-L2 SC-L3 SC-P1 5 - 200 ohm 5 - 200 ohm 5 - 200 ohm FT-N Red (-) SC-L1 5 - 200 ohm SC-L2 5 - 200 ohm SC-L3 5 - 200 ohm Black ( + )
Page 268 [ IX Troubleshooting ] [THMU-A] -7- Control Circuit (THMU-A) (1) Control power source function block 1) PUHY-P72, P96THMU-A Power source system (AC 208 / 230 V) Control system (DC 5 ~ 30 V) Noise filter INV board Compressor Rectifier Smoothing capacitor Inverter Noise filter AC 208 / 230 V...
Page 269: Indoor Unit
[ IX Troubleshooting ] [THMU-A] 2) PUHY-P120THMU-A Power source system (AC 208 / 230 V) Control system (DC 5 ~ 30 V) Noise filter Compressor Smoothing capacitor Inverter Noise filter Rectifier AC 208 / 230 V INV board Inverter drive Fuse Terminal block for 15V Power supply...
Page 270 [ IX Troubleshooting ] [THMU-A] (2) Troubleshooting transmission power circuit of outdoor unit 1) PUHY-P72, P96THMU-A Check the voltage at the indoor/outdoor transmission terminal block (TB3) of outdoor unit. DC 24 ~ 30 V Check whether the transmission line is disconnected, check for contact failure, and repair the problem.
Page 271 [ IX Troubleshooting ] [THMU-A] 2) PUHY-P120THMU-A Check the voltage at the indoor/outdoor transmission terminal block (TB3) of outdoor unit. Check whether the transmission line is disconnected, DC 24 ~ 30 V check for contact failure, and repair the problem. Check the voltage at TB3 after removing transmission line from TB3.
Page 272 [ IX Troubleshooting ] [YHMU-A] -6- Control Circuit (YHMU-A) (1) Control power source function block 1) PUHY-P72, P96, P120YHMU-A Power source system (AC 380 / 415 V) Control system (DC 5 ~ 30 V) INV board Noise filter Compressor Smoothing capacitor Inverter Noise filter Rectifier...
Page 273 [ IX Troubleshooting ] [YHMU-A] (2) Troubleshooting transmission power circuit of outdoor unit 1) PUHY-P72, P96, P120YHMU-A Check the voltage at the indoor/outdoor transmission terminal block (TB3) of outdoor unit. Check whether the transmission line is disconnected, DC 24 ~ 30 V check for contact failure, and repair the problem.
Page 274: Refrigerant Leak
[ IX Troubleshooting ] [5] Refrigerant Leak 1. Leak spot: In the case of extension pipe for indoor unit (Cooling season) 1) Mount a pressure gauge on the service check joint (CJ2) on the low-pressure side. 2) Stop all the indoor units, and close the liquid service valve (BV2) inside the outdoor unit while the compressor is being stopped. 3) Stop all the indoor units;...
Page 275 [ IX Troubleshooting ] 3. Leak spot: In the case of extension pipe for indoor unit (Heating season) (1) Run all the indoor units in heating test run mode. 1) To run the indoor unit in test run mode, turn SW3-2 from ON to OFF when SW3-1 on the outdoor control board is ON. 2) Change the setting of the remote controller for all the indoor units to the heating mode.
Page 276: Compressor Replacement Instructions
[ IX Troubleshooting ] [6] Compressor Replacement Instructions [Compressor replacement procedures] Follow the procedures below (Steps 1 through 6) to remove the compressor components and replace the compressor. Reassemble them in the reverse order after replacing the compressor. 1. Remove both the top and bottom service panels 2.
Page 277 [ IX Troubleshooting ] Compressor covers (right and left) (The inside of the compressor cover is lined with sound insulation material.) Compressor cover (top) Crankcase heater 4. Remove the compressor cover (top). 5. Remove the compressor wires, compressor covers (right and left), and crankcase heater. Protection for the sealing material Suction piping...
Page 278: Troubleshooting Using The Outdoor Unit Led Error Display
[ IX Troubleshooting ] [7] Troubleshooting Using the Outdoor Unit LED Error Display If the LED error display appear as follows while all the SW1 switches are set to OFF, check the items under the applicable item numbers below. 1. Error code appears on the LED display. Refer to IX [2] Responding to Error Display on the Remote Controller.
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Page 280: Led Monitor Display On The Outdoor Unit Board
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Page 282: How To Read The Led On The Service Monitor
[ X LED Monitor Display on the Outdoor Unit Board ] X LED Monitor Display on the Outdoor Unit Board [1] How to Read the LED on the Service Monitor 1. How to read the LED By setting the DIP SW 1-1 through 1-10 (Switch number 10 is represented by 0), the operating condition of the unit can be monitored on the service monitor.
Page 283 [ X LED Monitor Display on the Outdoor Unit Board ] 3. Time data storage function The outdoor unit has a simple clock function that enables the unit to calculate the current time with an internal timer by receiv- ing the time set by the system controller, such as G(B)-50A. If an error (including a preliminary error) occurs, the error history data and the error detection time are stored into the service memory.
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Mitsubishi Electric PUHY-P72THMU-A Service Handbook

1 I Read before Servicing

2 II Restrictions

3 III Outdoor Unit Components

Remote Controller

Electrical Wiring Diagram

Refrigerant Circuit

Control

Test Run Mode

Troubleshooting

LED Monitor Display on the Outdoor Unit Board

Quick Links

Troubleshooting

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Summary of Contents for Mitsubishi Electric PUHY-P72THMU-A

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