Marvair AVP 24 Manuel télécharger pdf (Page 33)

ComPac 6/09-18

4.3 Compressor

Troubleshooting

NOTE: It is important to rule out other component failures before condemning the compressor.

The following electrical tests will aid diagnosis:

1. Start-Up Voltage: Measure the voltage at the compressor terminals during start-up. The voltage

must exceed the minimum shown in Table 5, section 2.2, or compressor failure is likely. A low

voltage condition must be corrected.

2. Running Amperage: Connect a clip-on type ammeter to the (common) lead to the compressor.

Turn on the supply voltage and energize the unit. The compressor will initially draw high amperage;

it should soon drop to the RLA value or less. If the amperage stays high, check the motor winding

resistances.

PROBLEM/SYMPTOM LIKELY CAUSE(S) CORRECTION

C. Unit cycles on high/low pressure

limit.

1. Loss or restriction of airow.

2. Restriction in refrigerant circuit.

3. Refrigerant overcharge (following

eld service)

4. Defective pressure control.

1. Check blower assembly for proper operation. Look

for airow restrictions, e.g.. the air lter. Check blower

motor and condenser fan.

2. Check for blockage or restriction, especially lter drier

and capillary tube assembly.

3. Evacuate and recharge to factory specications.

4. Check limit cutout pressures. Control is set to actuate at

approximately 35 PSIG (low pressure) and 400 PSIG (high

pressure).

D. Unit blows fuses or trips circuit

breaker.

1. Inadequate circuit ampacity.

2. Short, loose, or improper connection

in eld wiring.

3. Internal short circuit. Loose or

improper connection(s) in unit.

4. Excessively high or low supply volt-

age or phase loss (3ø only).

Note electrical requirements in Chapter 2 and correct

as necessary.

2. Check eld wiring for errors.

3. Check wiring in unit. See wiring and schematic dia-

grams. Test components (especially the compressor)

for shorts.

4. Note voltage range limitations specic to the com-

pressor troubleshooting section.

E. Water on oor near unit. 1. Obstruction in condensate line.

2. Obstruction or leak in condensate

pan.

3. Unit is not level.

1. Check for clog or restriction.

2. Check pan for leak or blockage.

3. Level unit.

F. No space heating or reduced heating

(units equipped with resistance ele-

ments)

1. Defective heating element(s).

2. Thermal limit open.

3. Defective heater relay.

4. Open thermal cut-out (TCO).

1. Check resistance element(s) for continuity.

2. Check continuity across thermal limit switch.

3. Check relay for proper operation. Replace if defective.

4. Check across TCO (adjacent to element(s)) for conti-

nuity. It is normally closed.

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Marvair AVP 24 Manuel Page 33

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