Pump Down; Evacuation - Bryant Evolution Connex SYSTXBBECW01-A Installation Instructions Manual

Next, the installer will enter the SERVICE VALVE INFORMATION screen. The
current liquid line subcool target, stabilization time, mode and speed in rpm, EXV
position in percent, indoor airflow in CFM, outdoor coil temperature in _F, indoor
temperature in _F, outdoor temperature in _F, compressor discharge pressure in
psig, and accumulator suction pressure in psig are displayed on this screen. Once
the stabilization time has expired, touch DONE.
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
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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.
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Touch START to begin the pump down process. Unit will begin running in
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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.
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Default time period for procedure is 120 minutes.
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Touch START on UI to open the valve.
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