Follett REF Series - Manual (Page 13)

Refrigeration system
The REF Series refrigeration system is designed to give many years of trouble-free service. Except for
routine cleaning of the air-cooled condenser and related parts, the refrigeration system requires no service or
maintenance. The system uses a capillary tube and is critically charged. Access fittings are provided for ease
of service. However, the connection of refrigeration service hoses to the fittings will almost invariably result in a
significant change in the system charge. This change can adversely affect the performance of your refrigerator.
Therefore, Follett recommends that if hoses are ever connected to the refrigeration system for service, the
refrigerant should be recovered, the system evacuated, and recharged by weighing in the correct refrigerant
charge.
Note: Do not charge the system by pressures.
Checking refrigeration system pressures
1. Remove the rear access panel (Fig. 12).
2. Turn the power switch to the on position.
3. Following the instructions on page 6 verify that the temperature controller is set to the original factory
cut-in setting of 38°F.
4. Allow the refrigerator to operate and stabilize at least 30 minutes, verifying the cut-out temperature is
being reached.
5. Connect refrigerant hoses to access fittings and measure air temperature at condensor intake grille.
6. Verify correct pressures with the temperature chart below.
7. Troubleshoot refrigeration system as needed.
Note: Do not attempt to obtain correct refrigeration pressures by adjusting the system charge.
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Condensor inlet air temperature 70 80 90 100
Discharge pressure 198 230 270 311
Suction pressure 25 31 38 46
HIGH PRESSURE VAPOR
HIGH PRESSURE LIQUID
LOW PRESSURE LIQUID
LOW PRESSURE VAPOR HIGH SIDE
SERVICE PORT
LOW SIDE
SERVICE PORT
FILTER-DRIER
COMPRESSOR
EVAPORATOR
CAPILLARY TUBE
CONDENSER
Refrigeration system diagram