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Test Run; The Following Phenomena Do Not Represent Trouble (emergency) - Mitsubishi Electric CITY MULTI PQHY-P-YEM-A Series Installation Manual

Air-conditioners for building application, heat source unit.
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10. Test run

10.1. The following phenomena do not represent trouble (emergency)

Indoor unit does not perform cooling (heat-
ing) operation.
The auto vane runs freely.
Fan setting changes during heating.
Fan stops during heating operation.
Fan does not stop while operation has been
No setting of fan while start SW has been
turned on.
Heat source unit does not operate by turning
switch on.
Indoor unit remote controller shows "HO" in-
dicator for about two minutes when turning
ON universal power supply.
Drain pump does not stop while unit has been
Drain pump continues to operate while unit
has been stopped.
Display of remote controller
"Cooling (heating)" flashes
Normal display
Normal display
Defrost display
No lighting
Heat ready
Normal display
"HO" flashes
Light out
The heating (cooling) operation cannot be performed while another indoor unit is
performing a cooling (heating) operation.
Because of the control operation of auto vane, it may change over to horizontal
blow automatically from the downward blow in cooling in case the downward
blow operation has been continued for 1 hour. At defrosting in heating, hot adjust-
ing and thermostat OFF, it automatically changes over to horizontal blow.
Ultra-low speed operation is commenced at thermostat OFF.
Light air automatically changes over to set value by time or piping temperature at
thermostat ON.
The fan is to stop during defrosting.
Fan is to run for 1 minute after stopping to exhaust residual heat (only in heating).
Ultra low-speed operation for 5 minutes after SW ON or until piping temperature
becomes 35°C, low speed operation for 2 minutes thereafter, and then set notch
is commenced. (Hot adjust control)
When the heat source unit is being cooled and the refrigerant is resting, warming
up operation is performed for at least 35 minutes to warm the compressor.
During this time, only the fan operates.
System is being driven.
Operate remote controller again after "HO" disappear.
After a stop of cooling operation, unit continues to operate drain pump for three
minutes and then stops it.
Unit continues to operate drain pump if drainage is generated, even during a


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