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SERVICE INSTRUCTIONS
The GNF refrigerators 285L, 250L, and 220L all are clean back refrigerators. A clean back
refrigerator incorporates the following parts foamed between the main liner and the cabinet.
1. The skin condenser - The condenser assembly is placed on the three sides of the cabinet.
2. Heat loop - The heat loop is placed along the front side of the cabinet.
3. Suction & Capillary - The suction & capillary is placed on the backside of the cabinet. The
serviceable joints are available one for the Evaporator assembly in the Freezer
compartment and the other to the compressor and the drier.
4. Water drainage system - The defrost water drainage gets collected on the tray kept over
the compressor through the tube which is again formed at the backside of the cabinet.
5. Wiring Harness Assembly - The wiring assembly is foamed at the back side of the
refrigerator in such a way providing serviceable wiring connector in three places such as (1)
in the freezer compartment for the fan motor, defrost heater and bi-metal, (2) in the
refrigerator compartment for the thermostat, bulb holder, timer motor and (3) in the back
side dome area for the compressor, relay, overload protection and power cord. Each
compartment will have small wiring assembly for connecting the electrical parts available as
mentioned.
As these above mentioned parts are foamed in they become non-serviceable parts.
Great care on quality is taken to make these parts free from failure as any failure on
the above parts may lead for the unit replacement as a whole.
The other parts in the freezer compartment, refrigerator compartment and the door
assemblies except the liners are serviceable and the procedures for the same are given in
the following pages.
Procedure for repair of sealed system failures of
R134a systems.
This section has been specially introduced to explain in detail the precautions and care to
be taken in repair of refrigerators, which use R134a as the refrigerant (as in the GNF
refrigerator). It also explains in detail the "SWEEP CHARGING PROCEDURE" which is the
recommended procedure for repair of sealed system failures.
R134a sealed system service
R134a is used as a refrigerant in the Global No Frost refrigerators to make it more
environments friendly and comply with Environmental Protection Agency rules. R134a is a
Hydroflorocarbon refrigerant (Non - CFC) which is chlorine free and it makes it non ozone
layer depleting unlike other refrigerants like R12 which is a Chloroflorocarbon (CFC).
R134a is in some way similar to R12 in refrigerating properties but there are some
important and critical differences that should be always remembered.
The main Points to be remembered while servicing a R134a refrigerant based refrigerator
are
i) R134a is more sensitive to contamination and it can not tolerate moisture, traces of other
chlorine-based refrigerants and other chemical substances. Hence use only the tubing,
equipment which is compatible with R134a and maintained exclusive for R134a and do not
mix it with the other equipment meant for R12 based systems.
ii) The lubricant (Easter oil) used in R134a systems can absorb large amounts of moisture
and cause contamination. Hence never open the replacement compressor stubs ends to
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