19
a. If the freezer has just completed a freezing cycle, turn off the
compressor by positioning the “COMPRESSOR” switch to
“OFF”. Let the unit sit overnight with the doors open and the
MAIN POWER SWITCH on. This will insure that the crankcase
heater remains energized to prevent refrigerant migration to the
crankcase.
b. Close the liquid outlet valve (HV4) at the bottom of the receiver.
c. Connect a gage manifold to the back-seated suction valve
(HV1) and discharge valve (HV2) charging ports. Then close
both valves one turn.
d. Start the compressor and jumper 9 to 10 (“L”& “M”) on the High-
Low Pressure Switch (see Figure 2) to keep the compressor
running. When the suction pressure gage indicates and 8 to 10-
inch vacuum, turn the compressor off by positioning the
“COMPRESSOR” switch to “OFF”.
e. Close the pumpdown shutoff valve by placing the “OPERATING
MODE” switch in the “PUMPDOWN ” position. Close the oil
return valve (HV8), suction valve (HV1), and discharge valves
(HV2 and HV3).
5. Crankcase Oil Charging Procedure
If the oil level in the crankcase falls below the center of the sight glass and
no defective parts are found in the oil return system, additional oil should
be added to the crankcase. The following steps should be taken:
A. Close the oil return hand valve (HV8)
B. Close the compressor suction (HV1). The compressor suction
pressure should be +1 or –1 psig.
C. Close the compressor discharge valve (HV2).
D. Unscrew the hex plug from the brass cross on the front of the
compressor. Pump oil into the crankcase until the oil level reaches 3/4 of
the sight glass. Copeland Ultra 22 Polyester Lubricant, Synthetic
Refrigeration Oil is used from the factory.
6. Charging Procedure After Leak Repair
A. Connect a refrigerant charging hose to the gage manifold charging
port. Crack the refrigerant drum gas valve to purge the hose, and then
