Follett REF Series Installations- und Wartungshandbuch - Seite 11
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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 fi ttings are provided for ease
of service. However, the connection of refrigeration service hoses to the fi ttings will almost invariably result in a
signifi cant 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. 11).
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 fi ttings and measure air temperature at condensor intake grille.
6. Verify correct pressures with the temperature chart below.
7. Troubleshoot refrigeration system as needed.
Condensor inlet air temperature
Discharge pressure
Suction pressure
Note: Do not attempt to obtain correct refrigeration pressures by adjusting the system charge.
Refrigeration system diagram
CAPILLARY TUBE
FILTER-DRIER
70
198
25
LOW SIDE
SERVICE PORT
COMPRESSOR
HIGH SIDE
SERVICE PORT
11
80
90
230
270
31
38
EVAPORATOR
CONDENSER
100
311
46
HIGH PRESSURE VAPOR
HIGH PRESSURE LIQUID
LOW PRESSURE LIQUID
LOW PRESSURE VAPOR