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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.
NOTE: Motor windings typically have very little
resistance. When checking windings for
shorts, ensure ohmmeter is set on lowest
scale. Good windings may indicate as little
as 2 ohms of resistance.
Ground
Test
1. Disconnect power to unit.
2. Remove leads from compressor terminals.
3. Set ohmmeter to highest scale.
4. Attach one lead of ohmmeter to body of
compressor. Ensure connection point is clean,
and makes good contact with compressor.
5. Attach remaining lead on ohmmeter to C, then S,
then R terminals on compressor. If ohmmeter
indicates continuity between compressor case
and any terminal, replace compressor.
Compressor
Burnout
To avoid personal injury, do not allow sludge or oil
from compressor to contact skin. Severe burns may
result.
NOTE: Before opening any refrigeration system, EPA
regulations require refrigerant in system to be
captured for safe disposal.
NOTE: Do not use captured or recycled refrigerant in
Amana units. Captured or recycled refrigerant
voids all Amana and/or compressor manufacturer's
warranties.
When a compressor burns out, high temperature
causes the refrigerant, oil, and motor insulation to
decompose, forming acids and sludge.
If a compressor is suspected of burning out:
1. Replace Compressor.
Fan Motor
1. Disconnect power to unit.
2. Discharge capacitor by shorting capacitor
terminals through a 10,000 ohm resistor.
3. Disconnect fan motor leads from selector switch
and respective capacitor.
4. Check for continuity between each motor lead with
ohmmeter.
5. Check for ground by attaching one lead of
ohmmeter to motor frame (ground). Attach
remaining ohmmeter lead to each fan motor lead,
one at a time.
NOTE: Ensure contact point between ohmmeter lead
and motor frame is clean.
Replace fan motor if windings test open (very high or
infinite resistance), or if any continuity is indicated
between motor frame and windings.
Leak Testing
I
DANGER
To prevent serious injury or death from violent
explosions, NEVER use oxygen or acetylene for
pressure testing or cleanout of refrigeration
systems. Free oxygen will explode on contact with
oil. Acetylene will explode spontaneously when put
under pressure.
It is important to check sealed system for refrigerant
leaks. Undetected leaks can lead to repeated service
calls and eventually result in system contamination,
restrictions, and premature compressor failure.
Refrigerant leaks are best detected with electronic
leak detectors.
Testing Systems
Containing
a Refrigerant
Charge
1. Stop the operation (turn air conditioner off).
2. Holding leak detector exploring tube as close to
system tubing as possible, check all piping, joints,
and fittings.
NOTE: Use soap suds on areas leak detector cannot
reach or reliably test.
Testing Systems
Containing
No Refrigerant
Charge
1. Connect cylinder of nitrogen, through gauge
manifold, to process tube of compressor and
liquid line strainer.
2. Open valves on nitrogen cylinder and gauge
manifold. Allow pressure to build within sealed
system.
14
16022380
Rev. 0
@2003
MaytagAppliancesCompany
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