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Mitsubishi Electric PURY-HP72 Service Handbook page 156

R410a
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[5-4 Operation Flowcharts ]
(3) Dry operation
1. Indoor unit fan stop
2. Inverter output 0Hz
3. Indoor unit LEV fully closed.
4. Solenoid valve OFF
5. Outdoor unit fan stop
6. BC controller Solenoid valve OFF
7. BC controller
*Note 1.When the indoor unit inlet temperature exceeds 18 C [64 F], the outdoor unit (compressor) and the
indoor unit fan start the intermittent operation simultaneously. When the indoor unit inlet temperature
becomes 18 C [64 F],or less, the fan always runs (at low speed). The outdoor unit, the indoor unit,
and the solenoid valve operate in the same way as they do in the cooling operation when the compressor
is turned on.
*Note 2.Thermostat is always kept on during test run mode, and indoor and outdoor unit intermittent operation
(ON) time is a little longer than that of normal operation.
HWE13080
Dry operation
4-way valve OFF
Test run mode
ON
NO
Suction temperature
18 C[64 F]
1. Outdoor unit (compressor)
intermittent operation
2. Indoor unit fan intermittent operations
(Synchronized with the compressor:
low speed, OFF operations)
LEV fully closed
2
- 145 -
YES
*Note 2
NO
Thermostat ON
YES
*Note 1
3
Normal operation
Thermostat ON
Unit in the stopped state
GB

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