Table of Contents
Advertisement
Quick Links
SPLIT-TYPE, AIR CONDITIONERS
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SERVICE TECHNICAL GUIDE
Wireless type Models
MS-A•WA
MSZ-A•NA
MSY-A•NA
Inverter-controlled multi system type Models
· MU-A•WA
· MUZ-A•NA
· MUZ-A•NA -
· MUY-A•NA
· MXZ-A•NA
CONTENTS
1. MS MICROPROCESSOR CONTROL ··················3
2. MSZ,MSY MICROPROCESSOR CONTROL ·······6
3. MXZ MICROPROCESSOR CONTROL ··············20
No. OBT16
U
Advertisement
Table of Contents
Related Manuals for Mitsubishi Electric MS-A•WA
Summary of Contents for Mitsubishi Electric MS-A•WA
- Page 1 SPLIT-TYPE, AIR CONDITIONERS SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS No. OBT16 SERVICE TECHNICAL GUIDE Wireless type Models MS-A•WA · MU-A•WA MSZ-A•NA · MUZ-A•NA · MUZ-A•NA - MSY-A•NA · MUY-A•NA Inverter-controlled multi system type Models · MXZ-A•NA CONTENTS 1. MS MICROPROCESSOR CONTROL ··················3 2.
-
Page 2: Table Of Contents
1. MS MICROPROCESSOR CONTROL ···························································3 Indoor unit models Outdoor unit models MS-A09WA MU-A09WA MS-A12WA MU-A12WA 1-1. COOL OPERATION················································································3 1-2. DRY OPERATION ··················································································3 1-3. AUTO VANE OPERATION ·····································································5 2. MSZ, MSY MICROPROCESSOR CONTROL ···············································6 Indoor unit models Outdoor unit models MSZ-A09NA MUZ-A09NA MSZ-A12NA MUZ-A12NA... -
Page 3: Ms Microprocessor Control
MS MICROPROCESSOR CONTROL MS-A09WA MU-A09WA MS-A12WA MU-A12WA 1-1. COOL ( ) OPERATION Difference between room temperature and set temper- 1. Thermostat control ature during operation. Thermostat is ON or OFF by difference between room temperature and set temperature Set temperature Initial temperature difference Thermostat Room temperature minus set temperature : -1.8 degrees or more·····································ON... - Page 4 Difference between room temperature and set temper- 1. Thermostat control ature during operation Thermostat is ON or OFF by difference between room temperature and set temperature. Initial temperature difference Thermostat Set temperature Room temperature minus set temperature : -1.8 degrees or more·····································ON Room temperature minus set temperature : less than -1.8 degrees···································OFF -1.8 deg.
-
Page 5: Auto Vane Operation
1-3. AUTO VANE OPERATION 1. Horizontal vane ECONO COOL ( ) operation (ECONOmical operation) When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 3.6 degrees higher than that in COOL mode. Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger (RT12). SWING operation makes you feel cooler than set temperature. -
Page 6: Msz,Msy Microprocessor Control
MSZ,MSY MICROPROCESSOR CONTROL MSZ-A09NA MSY-A15NA MUZ-A09NA MUY-A15NA MSZ-A12NA MSY-A17NA MUZ-A12NA MUY-A17NA MSZ-A15NA MSY-A24NA MUZ-A15NA MUY-A24NA MSZ-A17NA MUZ-A17NA MSZ-A24NA MUZ-A24NA 2-1. COOL ( ) OPERATION Difference between room temperature and set temper- 1. Thermostat control ature during operation. Thermostat is ON or OFF by difference between room temperature and set temperature Initial temperature difference Thermostat Set temperature... -
Page 7: Dry Operation
Set temperature and 2-2. DRY ( ) OPERATION ºF initial room temperature in dry mode Set temperature is as shown on the right chart. The system for dry operation uses the same refrigerant circuit as the cooling circuit. The compressor and the indoor fan are controlled by the room tem- perature. - Page 8 (2) Cold air prevention control MSZ-A09/12/15/17 1 When the compressor is not operating, (1) if the temperature of room temperature thermistor RT11 is less than 66°F, the fan stops. (2) if the temperature of room temperature thermistor RT11 is 66°F or more and (1) if the temperature of RT12 is less than 32°F, the fan stops.
-
Page 9: Auto Change Over
Time chart of defrosting in HEAT mode (reverse type) <indoor unit> horizontal set position set position Horizontal vane Indoor fan Very Low (temperature of indoor coil thermistor > 64°F) set speed set speed seconds <outdoor unit> Maximum frequency Compressor normal seconds seconds seconds... -
Page 10: Outdoor Fan Motor Control
(3) Indoor fan control/ Vane control As the indoor fan speed and the horizontal vane position depend on the selected operation mode, when the operation mode changes over, they change to the exclusive ones. 2-5. OUTDOOR FAN MOTOR CONTROL Fan speed is switched according to the compressor frequency. Fan speed Down High... - Page 11 <SWING operation> In swing operation of ECONO COOL operation mode, the initial air flow direction is adjusted to “Horizontal”. According to the temperature of indoor coil thermistor RT12 at starting of this operation, next downward blow time is decided. Then when the downward blow has been finished, next horizontal blow time is decided. For initial 10 minutes the swing operation is performed in table G~H for quick cooling.
-
Page 12: Inverter System Control
2-7. INVERTER SYSTEM CONTROL 2-7-1. MUZ-A09/12/15/17 MUY-A15/A17 2-7-1-1. Inverter main power supply circuit POWER P.C. BOARD INVERTER P.C. BOARD DB61 Power R64A R64B C63A CT761 supply C63B C63C CT781 TR821 DB65 Booster chopper circucuit Function of main parts SYMBOL NAME FUNCTION It supplies three-phase AC power to compressor. - Page 13 3. Purpose of PAM adoption PAM : Pulse Amplitude Modulation PAM has been adopted for the efficiency improvement and the adaptation to IEC harmonic current emission standard. Outline of simple partial switching method In conventional inverter models, diode module rectifies AC voltage to DC voltage, smoothing capacitor makes its DC waveform smooth, and IPM converts its DC voltage to imitated AC voltage again in order to drive the compressor motor.
- Page 14 Function of main parts SYMBOL NAME FUNCTION It supplies three-phase AC power to compressor. INTELLIGENT POWER MODULE CB1~3 It stabilizes the DC voltage. SMOOTHING CAPACITOR CT1~2 CURRENT TRANSFORMER It measures the current of the compressor motor. CT61 It measures the current of the main power supply circuit. CURRENT TRANSFORMER REACTOR It rectifies AC, controls its voltage and improves the power factor of...
- Page 15 2-7-3. Sine wave control In these air conditioners, compressor equips brushless DC motor which doesn't have Hall element. In short, the motor is sensorless. However, it's necessary to locate the polar direction of rotor in order to drive brushless DC motor efficiently.
-
Page 16: Operational Frequency Control Of Outdoor Unit
2-8. OPERATIONAL FREQUENCY CONTROL OF OUTDOOR UNIT 1. Outline The operational frequency is as following: First, the target operational frequency is set based on the difference between the room temperature and the set tem- perature. Second, the target operational frequency is regulated by discharge temperature protection, high pressure protection, electric current protection and overload protection and also by the maximum/minimum frequency. -
Page 17: Expansion Valve Control (Lev Control)
2-9. EXPANSION VALVE CONTROL (LEV CONTROL) (1) Outline of LEV control The LEV basic control is comprised of setting LEV opening degree to the standard opening degrees set for each opera- tional frequency of the compressor. However, when any change in indoor/outdoor temperatures or other factors cause air conditioning load fluctuation, the LEV control also works to correct LEV opening degree based on discharge temper- ature (Shell temperature) of the compressor, developing the unit’s performance. - Page 18 (2) Time chart Air conditioner OFF (thermostat off) Air conditioner ON Positioning Opening degree is corrected according to discharge Standard Commanded temperature. opening to open degree about 5 minutes <COOL, DRY> Time about 15 minutes <HEAT> OFF Time (3) Control data (a) Reference value of target discharge temperature (COOL/HEAT (MUZ)ºF) Applied model...
- Page 19 In COOL operation, the two indoor coil thermistors (one main and one sub) sense temperature ununiformity (super heat) at the heat exchanger, and when temperature difference have developed, the indoor coil thermistors adjust LEV opening degree to get approximate 10 degrees lower temperature than the target temperature in the table above, thus diminishing super heat.
-
Page 20: Mxz Microprocessor Control
MXZ MICROPROCESSOR CONTROL MXZ-2A20NA MXZ-3A30NA 3-1. INVERTER SYSTEM CONTROL 3-1-1. Inverter main power supply circuit POWER BOARD NOISE FILTER P. C. BOARD R64A/R64B POWER +CB1 CT61 SUPPLY Function of main parts SYMBOL FUNCTION NAME It supplies three-phase AC power to compressor. INTELLIGENT POWER MODULE CB1~3 SMOOTHING CAPACITOR... - Page 21 3. Power factor improvement Booster coil L (Reactor) and PFC rectify AC to DC and control its voltage. In the motor drive system of sine wave control, power factor can be improved by reducing harmonics PFC and L (Reactor) stabilize the voltage of DC supplied to inverter circuit and make its waveform smooth. 4.
-
Page 22: Expansion Valve Control (Lev Control)
3-2. EXPANSION VALVE CONTROL (LEV CONTROL) Linear expansion valve (LEV) is controlled by "Thermostat ON" commands given from each unit. LEV opening Indoor unit status Stop of all indoor unit Opening before stop 500 pulse in 15 minutes When outdoor unit is operating, COOL : 5 pulse (full closed) some indoor units stop and HEAT :140 pulse (slightly opened) - Page 23 The table below shows the role of Exclusive LEV and Receiver LEV in each operation mode. wEvaporation High Circulation Discharge Capacity Pressure Temperature Amount Temperature Distribution Control Protection Protection Protection Exclusive LEV COOL Receiver LEV Exclusive LEV HEAT Receiver LEV Indoor heat Exclusive Outdoor...
- Page 24 84 100 115 131 146 MXZ-2A MXZ-3A Compressor operating frequency (Hz) MXZ-2A Standard opening (pulse) LEV Opening(code) COOL HEAT Difference in capacity Difference in operation number Code3,4 Code5,6 Code7,8 Code9,10 Code11,12 Code13,14 Code15or above COOL HEAT MXZ-3A Standard opening (pulse) LEV Opening(code) COOL HEAT...
- Page 25 <Correction> COOL HEAT • • • 1 Discharge temperature 2 Each correction • • • (Each gas pipe temperature thermistor - Minimum gas pipe temperature thermistor)w 1 • (Main indoor coil thermistor - Sub indoor coil thermistor) w 1 Perform this, when number of operation units is 2 units or more. w 2 Correct the LEV opening by discharge temperature.
- Page 26 Correct the LEV opening according to the difference between target discharge temperature and discharge temperature. MXZ-2A LEV opening correction (pulse) Discharge temperature (˚F) COOL HEAT More than Target discharge temperature+18 Target discharge temperature+18 to Target discharge temperature+9 Target discharge temperature+9 to Target discharge temperature+3.6 Target discharge temperature+3.6 to Target discharge temperature-3.6 Target discharge temperature-3.6 to Target discharge temperature-9...
-
Page 27: Operational Frequency Range
b) Correct the LEV separately by temperature difference “ RT” between main/sub indoor coil thermistor. LEV opening correction (pulse) 10.8[ 7.2[ RT< 10.8 RT<7.2 In addition, decrease the target discharge temperature corresponding Temperature to be decreased (˚F) 10.8[ 7.2[ RT< 10.8 RT<7.2 3-3. -
Page 28: Heat Defrosting Control
Or, the indoor coil thermistor is 113˚F or less on HEAT operation, fan speed is back to normal. HEAD OFFICE: TOKYO BLDG.,2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN C C Copyright 2006 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD New publication, effective Apr. 2006 Distributed in Apr.