Electrolux FAC124P1A Instruções de Operação descarregar pdf (Página 117)

Section 6 Sealed System

6-3

Soldering

1. All joints to be soldered must have a proper fit.

Clearance between tubes to be soldered should be

from .001” to .006”. It is not practical to actually

measure this; however, you do not want a dry fit or

loose fit. Tubing joints should overlap about the

distance of their diameter except for restrictor tubes,

which should be inserted 1.25”.

2. Clean all joint areas with fine steel wool or prefer-

ably an abrasive cloth, such as grit cloth No. 23 or

Scotch-Brite.

3. Apply a thin film of liquid flux recommended for

silver soldering to surfaces to be joined, and to

surfaces immediately adjacent to joint.

4. Align tubing so no stress is on joint. Do not move

tubing while solder is solidifying or leaks will result.

5. Use a torch of adequate capacity so joint can be

quickly heated with a minimum of heat travel to

other points. Use a good grade of silver solder.

6. Solder connections. Use a good grade of silver

solder. A 45% silver solder is recommended. If

tubing is properly cleaned and fluxed, solder will

flow readily. Use only enough solder to make a

good bond.

7. Allow joint to cool, then wash exterior with water to

remove flux.

Wear approved safety glasses when working

with or on any pressurized system or equipment.

have an approved dry type fire extinguisher

handy when using any type of gas operated

torch.

During application of heat, use wet cloths to

prevent heat from conducting to areas other

than the soldered joint. Use a sheet of metal

or torch guard pad as a heat deflector to keep

flame away from inflammable materials and

painted surfaces.

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 ﬂ ame,

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 sufﬁ cient 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.

When a hydraulic block occurs, the compressor is

prevented from starting. This condition is known as

locked rotor. Electric current continues to ﬂ ow 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

speciﬁ ed for the system.

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