Dry Operation - Mitsubishi Electric PUHY-200YMF-C Service Handbook

(6) Dry operation

1. Indoor unit fan stop
2. Inverter output 0Hz
3. Indoor unit LEV, oil return LEV
closed
4. Solenoid valve OFF
5. Outdoor unit fan stop
6. BC controller solenoid valve OFF
(PURY)
7. BC controller LEV fully closed
(PURY)
Note : 1 When indoor unit inlet temperature exceeds 18˚C, outdoor unit (compressor) and indoor unit fan start intermittent operations
synchronously. Operations of outdoor unit, BC controller (PURY), indoor unit LEV and solenoid valve accompanying
compressor are the same as those in cooling operations.
Note : 2 Thermostat is always kept on in test run, and indoor and outdoor unit intermittent operation (ON) time is a little longer than
normal operations.
Dry operations
4-way valve OFF
Test run start
NO
NO
Inlet temp. 18˚C
YES
1. Outdoor unit (Compressor) intermit-
tent operations
2. Indoor unit fan intermittent opera-
tions YES
(Synchronized with compressor :
low speed, OFF operations)
–69–
YES
Note : 2
Thermostat ON
Note : 1
Normal operations
Thermostat ON
Stop