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A14664a
6.6.2. Pump Down
Because this system has an inverter controlled compressor, suction
pressure transducer and EXV, conventional procedure cannot be used to
“pump down” and isolate the refrigerant into the outdoor unit. The
control has provisions to assist in performing this function.
• Select mode to pump down in (COOL or HEAT). COOL mode
allows refrigerant to be isolated in outdoor unit. HEAT mode allows
the refrigerant to be isolated in indoor coil and lineset. Set desired time
period. Default time period for procedure is 120 minutes.
• Touch START to begin the pump down process. Unit will begin
running in selected mode after a brief delay.
6.6.3. Evacuation
Because this system has an EXV for the heating expansion device,
additional steps must be taken to open the EXV if the heat pump unit
must be evacuated for service reasons. If the EXV is not open when
pulling a vacuum or recovering refrigerant from the heat pump unit,
extended evacuation time may be required and/or inadequate vacuum
obtained. The control has provisions to open the EXV for refrigerant
recovery and/or evacuation.
• Set desired time period. Default time period for procedure is 120
minutes.
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