Amana GSC13060 Service Manual download pdf (Page 44)

SERVICING

S-115 COMPRESSOR BURNOUT

When a compressor burns out, high temperature develops

causing the refrigerant, oil and motor insulation to decom-

pose forming acids and sludge.

If a compressor is suspected of being burned-out, attach a

refrigerant hose to the liquid line dill valve and properly remove

and dispose of the refrigerant.

NOTICE

Violation of EPA regulations may result in fines

or other penalties.

Now determine if a burn out has actually occurred. Confirm

by analyzing an oil sample using a Sporlan Acid Test Kit, AK-

3 or its equivalent.

Remove the compressor and obtain an oil sample from the

suction stub. If the oil is not acidic, either a burnout has not

occurred or the burnout is so mild that a complete clean-up

is not necessary.

If acid level is unacceptable, the system must be cleaned by

using the clean-up drier method.

CAUTION

Do not allow the sludge or oil to contact the skin.

Severe burns may result.

NOTE: The Flushing Method using R-11 refrigerant is no

longer approved by Goodman Company, L.P.

Suction Line Drier Clean-Up Method

Use AMANA

part number RF000127 suction line filter drier

kit. This drier should be installed as close to the compressor

suction fitting as possible. The filter must be accessible and

be rechecked for a pressure drop after the system has

operated for a time. It may be necessary to use new tubing

and form as required.

NOTE: At least twelve (12) inches of the suction line

immediately out of the compressor stub must be discarded

due to burned residue and contaminates.

1. Remove compressor discharge line strainer.

2. Remove the liquid line drier and expansion valve.

3 Purge all remaining components with dry nitrogen or

carbon dioxide until clean.

4. Install new components including liquid line drier.

5. Braze all joints, leak test, evacuate, and recharge sys-

tem.

6. Start up the unit and record the pressure drop across the

drier.

7. Continue to run the system for a minimum of twelve (12)

hours and recheck the pressure drop across the drier.

Pressure drop should not exceed 6 PSIG.

8. Continue to run the system for several days, repeatedly

checking pressure drop across the suction line drier. If

the pressure drop never exceeds the 6 PSIG, the drier

has trapped the contaminants. Remove the suction line

drier from the system.

9. If the pressure drop becomes greater, then it must be

replaced and steps 5 through 9 repeated until it does not

exceed 6 PSIG.

NOTICE: Regardless, the cause for burnout must be deter-

mined and corrected before the new compressor is started.

S-120 REFRIGERANT PIPING

The piping of a refrigeratin system is very important in relation

to system capacity, proper oil return to compressor, pump-

ing rate of compressor and cooling performance of the

evaporator.

This long line set application guideline applies to all ARI

listed R22 air conditioner and heat pump split system

matches of nominal capacity 18,000 to 60,000 Btuh. This

guideline will cover installation requirements and additional

accessories needed for split system installations where the

line set exceeds 50 feet in actual length.

Additional Accessories:

1. Crankcase Heater- a long line set application can

critically increase the charge level needed for a system.

As a result, the system is very prone to refrigerant

migration during its off-cycle and a crankcase heater will

help minimize this risk. A crankcase heater is recom-

mended for any long line application (50 watt minimum).

2. Hard Start Assist- increased charge level in long line

applications can require extra work from the compressor

at start-up. A hard start assist device may be required to

overcome this.

Tube Sizing:

1. In long line applications, the “equivalent line length” is the

sum of the straight length portions of the suction line plus

losses (in equivalent length) from 45 and 90 degree

bends. Select the proper suction tube size based on

equivalent length of the suction line (see Tables 8 &

9) and recalculated system capacity.

Equivalent length = Length horizontal + Length vertical +

Losses from bends (see Table 9)

2. For any residential split system installed with a long

line set, the liquid line size must never exceed 3/8".

Limiting the liquid line size to 3/8" is critical since an

increased refrigerant charge level from having a larger

liquid line could possibly shorten a compressor’s lifespan.

3. Single Stage Condensing Unit: The maximum length

of tubing must not exceed 150 feet.

• 50 feet is the maximum recommended vertical differ-

ence between the condenser and evaporator when the

evaporator is above the condenser. Equivalent length

is not to exceed 150 feet.

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Amana GSC13060 Service Manual Page 44

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