Electrolux Refrigerator FKCH17F7HW User Manual download pdf (Page 16)

3-2

Refrigeration System

Instructions given here are furnished as a guide.

Persons attempting to use these instructions to

make repairs to the sealed refrigeration system

should have a working knowledge of

refrigeration and previous training on sealed

system repair, and an EPA certification for

servicing refrigeration systems.

The use of recovered refrigerant in the servicing

of products for in-warranty and out-of-warranty

repairs or for products covered by service

contracts is not permitted. Therefore, only new

refrigerant or refrigerant that has been reclaimed

back to new specifications by a

refrigerant manufacturer is to be used.

Effective July 1, 1992, the United States clean air

act governs the disposal of refrigerants such as

R-134a. Therefore, when discharging or purging

the sealed system use an EPA approved

refrigerant recovery system as outlined in the

final rule on the protection of stratospheric ozone

and refrigerant recycling, which was published in

the Federal Register May 14, 1993.

Definitions

Recovery:

To remove refrigerant in any condition from a system

and store it in an external container without necessarily

testing or processing it in any way.

Recycling:

To clean refrigerant for reuse by oil separation and

single or multiple passes through devices, such as

replaceable core filter-driers, which reduce moisture,

acidity and particulate matter. This term usually applies

to procedures implemented at the field job site or at a

local service shop.

Reclaim:

To reprocess refrigerant to new product specifications

by means which may include distillation, will require

chemical analysis of the refrigerant to determine that

appropriate product specifications are met. This term

usually implies the use of processes or procedures

available only at a reprocessing or manufacturing

facility.

Safety Warnings

Compressor Testing

Whenever testing a compressor, extreme caution should

be used to prevent damaging the terminals. A

compressor with a damaged terminal or a grounded

winding can expel a terminal from its insulated housing

when the compressor is energized. If this happens, a

mixture of refrigerant and oil will be released that could

be ignited by an external heat source (open flame,

heater, etc.). Also, if there is air in the system when this

happens, a spark at the compressor shell could ignite

the refrigerant and oil mixture.

Charging Sealed Systems

Overcharging a refrigeration system with refrigerant can

be dangerous. If the overcharge is sufficient to immerse

the major parts of the motor and compressor in liquid

refrigerant, a situation has been created which, when

followed by a sequence of circumstances can lead to

the compressor shell seam separating.

A hydraulic block occurs, preventing the compressor

from starting. This condition is known as locked rotor.

Electric current continues to flow through the

compressor motor windings which become, in effect,

electric resistance heaters. The heat produced begins to

vaporize the excess refrigerant liquid causing a rapid

increase in system pressure. If the compressor

protective devices fail, the pressure within the system

may rise to extremes far in excess of the design limits.

Under these conditions, the weld seam around the

compressor shell can separate with explosive force,

spewing oil and refrigerant vapor which could ignite.

To eliminate this exceedingly rare but potential hazard,

never add refrigerant to a sealed system. If refrigerant is

required, evacuate the existing charge and recharge

with the correct measured amount of the refrigerant

specified for the system.

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Electrolux Refrigerator FKCH17F7HW User Manual Page 16

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