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1
INTRODUCTION
The service manual covers the implementation of electronic control to Vertical Freezers.
1.1
Electronics
Changes to the single temperature models are that an electronic module has replaced the defrost
timer and relay. A variable resistor replaces the thermostat.
With the introduction of the electronic module, some of the current functions of the product will also
change. These will be covered under the appropriate headings.
The operational component such as the evaporator has also changed from the corrugated type
evaporator to the new Showa fin on tube evaporator. The condenser and cabinet do not change.
1.2
Product Specification
1.2.1
Compressors
Product Model
Compressor Part Number
Refrigerant Charge
E373/450
207119
100 grams R134a
1.2.2
Compressor Specification
Brand
Matsushita
Model
SF48C91RAW5
Part Number
207116
Volts
230/240
Hertz
50
Nominal BTU
470
Output Watts
138
Run Current (Amps)
0.50
Start Resistance (Ohms)
28.50
Run Resistance (Ohms)
18.20
Relay
F&P Electronic
Overload Part Number
Run Capacitor Part Number
207164
1.3
Condenser Layout
The new compressors have no oil cooler lines; therefore the re-routing of the condenser is as
follows:
Discharge line from the compressors runs directly to the waste water tray and then into the
condenser on the back panel. From the back panel it enters the LH side condenser (viewed from
the rear), through the cross rail heater (if applicable) then into the RH side condenser, then into the
filter dryer. The remaining layout remains unchanged.
