Remington REM-05-240-GH Service Manual download pdf (Page 29)

External Overload

With power off, remove the leads from compressor termi-

nals. If the compressor is hot, allow the overload to cool

before starting check. Using an ohmmeter, test continu-

ity across the terminals of the external overload. If you

do not have continuity; this indicates that the overload is

open and must be replaced.

Certain unit components operate at

temperatures hot enough to cause burns.

Proper safety procedures must be followed,

and proper protective clothing must be

worn.

Failure to follow this warning could result

in moderate to serious injury.

WARNING

BURN HAZARD

Single Phase Resistance Test

Remove the leads from the compressor terminals and set

the ohmmeter on the lowest scale (R x 1).

Touch the leads of the ohmmeter from terminals common

to start (“C” to “S”). Next, touch the leads of the ohmmeter

from terminals common to run (“C” to “R”).

Add values “C” to “S” and “C” to “R” together and

check resistance from start to run terminals (“S” to “R”).

Resistance “S” to “R” should equal the total of “C” to “S”

and “C” to “R.”

In a single phase PSC compressor motor, the highest

value will be from the start to the run connections (“S” to

“R”). The next highest resistance is from the start to the

common connections (“S” to “C”). The lowest resistance

is from the run to common. (“C” to “R”) Before replacing a

compressor, check to be sure it is defective.

ELECTRIC SHOCK HAZARD

WARNING

Turn off electric power before service or

installation. Extreme care must be used, if it

becomes necessary to work on equipment

with power applied.

Failure to do so could result in serious injury or

death.

Many compressor failures are caused by the following

conditions:

1. Improper air ow over the evaporator.

2. Overcharged refrigerant system causing liquid to be

returned to the compressor.

3. Restricted refrigerant system.

4. Lack of lubrication.

5. Liquid refrigerant returning to compressor causing oil

to be washed out of bearings.

6. Noncondensables such as air and moisture in

the system. Moisture is extremely destructive to a

refrigerant system.

GROUND TEST

Use an ohmmeter set on its highest scale. Touch one

lead to the compressor body (clean point of contact as a

good connection is a must) and the other probe in turn

to each compressor terminal. If a reading is obtained the

compressor is grounded and must be replaced.

Check the complete electrical system to the compressor

and compressor internal electrical system, check to be

certain that compressor is not out on internal overload.

Complete evaluation of the system must be made whenever

you suspect the compressor is defective. If the compressor

has been operating for sometime, a careful examination

must be made to determine why the compressor failed.

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Remington REM-05-240-GH Service Manual Page 29

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