Demand Control; Control Of Ih Energization Without The Compressor In Operation (Not Applicable To The Ep500 Model); Compressor Heater Control (Ep500 Model) - Mitsubishi Electric PURY-P200YLM-A(1) Service Handbook

[5-2 Outdoor Unit Control ]
5-2-17

Demand Control

Cooling/heating operation can be prohibited (Thermo-OFF) by an external input to the indoor units.
When DIP SW6-8 is set to ON, the 4-step DEMAND control is enabled.
Eight-step demand control is possible in the system with two outdoor units.
For details, refer to the following page(s). [2-4-7 Various Control Methods Using the Signal Input/Output Connector on Outdoor
Unit](page 28)
5-2-18 Control of IH energization without the compressor in operation (not applicable
to the EP500 model)
IH is used to heat the compressor motor on the stopped outdoor unit to make liquid refrigerant in the compressor evaporate
or to keep liquid refrigerant from flooding the compressor.
Initial power on after power is turned on: Stays on for 12 hours, and then transitions to the operation that is performed while
the compressor is stopped
When the compressor is stopped: Stays off for 30 minutes after the compressor stopped, and then repeats the on-off cycle
at 30-minute intervals
5-2-19

Compressor heater control (EP500 model)

When the outdoor unit is stopped, the heater wrapped around the compressor heats up the compressor to evaporate the ac-
cumulated liquid refrigerant and prevent liquid refrigerant accumulating in the compressor.
It is always energized when the compressor is stopped.
HWE1314A
- 151 -
GB