Bryant Evolution Connex Control, Руководство по установке, Страница: 89 / 116

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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.
S
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.
d
Default time period for procedure is 120 minutes.
S
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.
S
Set desired time period.
d
Default time period for procedure is 120 minutes.
S
Touch START on Evolution Connex Control or service tool to open the valve.
S
Begin evacuation or refrigerant recovery as required for the procedure after
control indicates the EXV is open. Power may be removed from heat pump
after the control indicates “
READY TO EVACUATE .”