Service manual

General Functionality ESIE04-01
2–16 Part 2 – Functional Description
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1.12 Pump Down Residual Operation
Outline The unit will conduct a pump down residual operation after each compressor stop command.
Purpose of this function is to collect the refrigerant in the liquid receiver and outdoor heat exchanger
in order to prevent liquid refrigerant from remaining in the indoor heat exchanger.
Parameters
Graph
Ending condition
P 30 seconds have elapsed since start of residual operation
OR
P LP < 1 bar (in cooling)
P LP < 0.2 bar (in heating)
RZQ71B RZQ100~125B
Compressor 38 Hz 41 HZ
Expansion valve 85 to 0 pulses (after 20 seconds)
RZQ - Final.book Page 16 Monday, September 20, 2004 11:24 AM