Amana AAC051SRA Service Manual download pdf (Page 13)

Testing Procedures

WARNING

To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit and

discharge capacitor through a 10,000 ohm resistor before attempting to service, unless test procedures require

power to be connected. Ensure all ground wires are connected before certifying unit as repaired and/or

operational.

Low Voltage

Low voltage can result in one or more of the following

problems:

Unit will not operate.

Compressor motor cycling.

Premature failure of overload protector.

Frequent blown fuses or tripped circuit breakers.

Premature failure of compressor or fan motor.

Noticeable dimming of lights when unit is operating.

Common causes for low voltage include inadequate

supply circuit wiring; use of extension cords; and

loose fuses or connections in fuse box, circuit

breaker, or distribution panel.

NOTE: A good indication of voltage problems caused

by inadequate or faulty wiring is voltage

levels that do not remain constant under load

(supply voltage fluctuates).

A less common cause for low voltage is voltage from

local electric utility is low (sometimes called "brown

outs"). If this is the case, have consumer contact

local electric utility for assistance.

All units should operate normally if power stays within

specifications (refer to Technical Sheet for unit under

test). Test for low voltage using voltmeter. Verify

voltage level at circuit breaker/distribution panel for

unit under test, and at electrical outlet serving unit.

Take initial voltage readings with air conditioner

turned off. Take additional readings during start-up of

unit, and again while unit is operating. All readings

should be within specifications and remain constant.

NOTE: Supply voltage may drop momentarily during

initial start-up and when compressor first

starts, but should always remain within

specifications.

High Voltage

High voltage causes motors to overheat, cycle on

their protectors, or break down electrically. This

problem can only be solved by local electric utility.

@2003 Maytag Appliances Company

Testing Capacitors

Compressors in these units use permanent split

capacitor type motors, eliminating need for start

capacitors and relays. A low capacitance

"compressor run capacitor" assists during start, and

remains in system during operation. See directions

on capacitor, and wiring diagram (on Technical

Sheet) for unit under test.

Capacitors are also used on permanent split

capacitor (PSC) fan motors.

To test capacitors:

1. Disconnect power to unit.

2. Discharge capacitor by shorting capacitor

terminals through a 10,000 ohm resistor.

Disconnect leads attached to capacitor terminals.

3. Set ohmmeter on highest scale. Attach ohmmeter

leads to capacitor and observe ohmmeter display:

•Good condition--indicator swings to zero and

slowly returns toward infinity.

•Shorted--indicator swings to zero and remains.

•Open--indicator does not move.

4. Reverse ohmmeter leads on capacitor and repeat

step 3.

Checking Overload Protectors

Overload protectors protect compressor from current

and temperature overloads by removing power from

compressor before it is damaged.

To check overload protector:

1. Disconnect power to unit.

2. Remove overload lead from compressor terminal.

3. Use ohmmeter to test continuity between overload

terminals. If open, replace overload.

Checking Compressor Windings

Resistance Test

1. Disconnect power to unit.

2. Remove leads from compressor terminals.

3. Set ohmmeter to lowest scale.

4. Attach ohmmeter to compressor terminals C and

S. Note reading.

5. Attach ohmmeter to compressor terminals C and

R. Note reading. If either compressor winding

reads open (infinite or very high resistance) or

dead short (0 ohms), replace compressor.

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Amana AAC051SRA Service Manual Page 13

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