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Only for training and service purposes
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Part 3 Control logic
1. At the starting (outdoor is powered on,indoor is not) reversing valve continues OFF(cooling).
2. For the cooling and defrosting operation :valve OFF, for the heating operation :valve ON
3. Method of changing mode from heating to defrosting : As defrosting starts Inverter compressor Hz is lowered to 30Hz
for 5 sec and the valve is OFF for the defrost mode. (refer “working process of each component in defrosting and
returning to heating mode ”)
4 . Method of changing mode from defrosting to heating : As the defrosting is finished inverter compressor frequency is
lowered to 30Hz for 10 sec. And the valve is ON for the heating mode.
5. If the operating mode is changed to heating from cooling, “3 min. restarting rule” is applied, and reversing valve
position is changed within 30 sec. after compressor turns OFF.
6. If the compressor is stopped during heating mode by remote controller operation or error mode, reversing valve
position is changed to OFF in 30 sec. after compressor turns OFF.
7. If the compressor is stopped during heating mode by Thermistor signal, reversing valve will remain in heating
position.
3. Reversing valve operation
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