Remington REM-05-240-GH Service Manual download pdf (Page 22)

Refrigerant Charging

Proper refrigerant charge is essential to proper unit opera-

tion. Operating a unit with an improper refrigerant charge will

result in reduced performance (capacity) and/or efciency.

Accordingly, the use of proper charging methods during ser-

vicing will insure that the unit is functioning as designed and

that its compressor will not be damaged.

Too much refrigerant (overcharge) in the system is just as bad

(if not worse) than not enough refrigerant (undercharge). They

both can be the source of certain compressor failures if they

remain uncorrected for any period of time. Quite often, other

problems (such as low air ow across evaporator, etc.) are

misdiagnosed as refrigerant charge problems. The refrigerant

circuit diagnosis chart will assist you in properly diagnosing

these systems.

An overcharged unit will at times return liquid refrigerant

(slugging) back to the suction side of the compressor eventually

causing a mechanical failure within the compressor. This

mechanical failure can manifest itself as valve failure, bearing

failure, and/or other mechanical failure. The specic type of

failure will be inuenced by the amount of liquid being returned,

and the length of time the slugging continues.

Not enough refrigerant (undercharge) on the other hand, will

cause the temperature of the suction gas to increase to the point

where it does not provide sufcient cooling for the compressor

motor. When this occurs, the motor winding temperature will

increase causing the motor to overheat and possibly cycle open

the compressor overload protector. Continued overheating of

the motor windings and/or cycling of the overload will eventually

lead to compressor motor or overload failure.

Unplug and/or disconnect all electrical power

to the unit before performing inspections,

maintenances or service.

Failure to do so could result in electric shock,

serious injury or death.

Sealed Refrigeration System contains refrigerant

and oil under high pressure.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with refrigerants.

Failure to follow these procedures could

result in serious injury or death.

WARNING

RISK OF ELECTRIC SHOCK

HIGH PRESSURE HAZARD

R-410A SEALED REFRIGERATION SYSTEM REPAIRS

SEALED SYSTEM REPAIRS TO COOL-ONLY MODELS REQUIRE THE INSTALLATION OF A LIQUID LINE DRIER.

SEALED SYSTEM REPAIRS TO HEAT PUMP MODELS REQUIRE THE INSTALLATION OF A SUCTION LINE DRIER.

IMPORTANT

EQUIPMENT REQUIRED:

1. Voltmeter

2. Ammeter

3. Ohmmeter

4. E.P.A. Approved Refrigerant Recovery System

5. Vacuum Pump (capable of 200 microns or less

vacuum.)

6. Acetylene Welder

7. Electronic Halogen Leak Detector capable of detect-

ing HFC (Hydrouorocarbon) refrigerants.

8. Accurate refrigerant charge measuring device such

as:

a. Balance Scales - 1/2 oz. accuracy

b. Charging Board - 1/2 oz. accuracy

9. High Pressure Gauge - (0 - 750 lbs.)

10. Low Pressure Gauge - (30 - 200 lbs.)

11. Vacuum Gauge - (0 - 1000 microns)

12.

Facilities for owing nitrogen through refrigeration tubing

during all brazing processes.

EQUIPMENT MUST BE CAPABLE OF:

1. Recovering refrigerant to EPA required levels.

2. Evacuation from both the high side and low side of the

system simultaneously.

3. Introducing refrigerant charge into high side of the

system.

4. Accurately weighing the refrigerant charge introduced

into the system.

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Remington REM-05-240-GH Service Manual Page 22

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