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MCM
062519
INSTALLING THE CONDENSING UNIT (continued)
Charging
•
With the power off to the condensing unit, admit liquid refrigerant through the liquid line service valve until the refrigerant
stops flowing.
•
Turn on the circuit breaker for the condensing unit. The compressor should turn on if the pressure in the suction line is above
25 psi.
•
Add refrigerant (in vapor form) to the low side of the system through the suction line service port.
•
Observe the sight glass. If bubbles are present, add more refrigerant (in vapor form) to the low side.
•
Once the sight glass is clear, check the superheat at the outlet of the evaporator unit. Adjust the TXV until the superheat is
between 20-30°F at the service valve.
•
Under normal operation, with the wine cellar at 55°F and the ambient temperature at 85°F, the low side pressure should be
between 28-32 PSI and the high side should be between 145-155 PSI.
Finalizing the Installation
•
Confirm that the entire suction line from the TXV to the suction line service valve is insulated using cellular insulation or
equivalent. Seal all seams with Armaflex 520 Foam Insulation Adhesive or equivalent.
•
Confirm that the control is displaying the correct temperature and that no alarms are present.
Charging Information
A.
Energize the solenoid valve on the evaporator unit by plugging the unit in and adjusting the thermostat to call for cooling.
