Follett FZR4-ADA Handbuch für Installation, Betrieb und Wartung - Seite 14
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Refrigeration System
The FZR series -20 C (-4 F) freezer refrigeration system is designed to give many years of trouble-free service.
Except for routine cleaning and inspection of the air-cooled condenser and evaporator defrost, the refrigeration
system requires no service or maintenance. The system uses a thermostatic expansion valve 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 freezer. 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. 14).
2. Turn the power switch to the on position.
3. Following the instructions on
controller is set to the original factory cut-in setting of -25 C (-13 F).
4. Allow the freezer to operate and stabilize at least 60 minutes,
verifying the cut-out temperature is being reached.
5. Connect refrigerant gauges to access fittings and measure air
temperature at condenser intake grille.
6. Verify correct pressures with the temperature chart below.
7.
Troubleshoot refrigeration system as needed.
Discharge and suction pressure table
Condenser Inlet Air Temperature
Discharge pressure (psi)
Suction pressure (psi)
Note: Do not attempt to obtain correct refrigeration pressures by adjusting the system charge.
Refrigeration System Diagram
Low Psi
Vapor
EVAPORATOR/DEFROST UNIT
HIGH PRESSURE VAPOR
14
FZR Undercounter Freezer
page 7 ,
verify that the temperature
70 F (21 C)
197
Low Psi
TXV
Liquid
HIGH PRESSURE LIQUID
80 F (27 C)
225
12
13
SERVICE PORT
HEAT EXCHANGE
DRYER
LOW PRESSURE LIQUID
Fig. 14
3
90 F (32 C)
100 F (38 C)
255
285
14
COMPRESSOR
10oz. Charge
High Psi
Vapor
LOW SIDE
HIGH SIDE
SERVICE PORT
High Psi
Liquid
CONDENSING UNIT
LOW PRESSURE VAPOR
2
15