Mitsubishi Electric CITY MULTI PUHY-400YMF-C Service Handbook page 113

(5) Dry operation
Variable capacity unit
1. Inverter output 0 Hz
2. Indoor unit LEV, SLEV,
LEV1 full closed
3. Solenoid valve OFF
4. Outdoor unit fan stop
5. 52C2 OFF
6. F = 0 after 6 minutes 52C1 OFF
Constant capacity unit
1. 52C OFF
2. Outdoor unit fan stop
3. LEV1, LEV2 full closed
4. Solenoid valve OFF
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, 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
(Synchronized with compressor: low
speed / OFF operations)
-110-
YES
Note: 2
Thermostat ON
Note: 1
Normal operations
Thermostat ON
Stop