10
ACCESSING COMPONENTS BEHIND THE DIVIDER WALL
Components accessible in the component compartment behind the divider wall include:
•
Sealed Refrigeration System: This system includes the compressor, strainer, all sealed
system tubing, the condenser and the evaporator.
•
Air Circulation System: This system includes the fan motor and the condenser and evapo-
rator fan blades.
•
The Capacitor: The dual-electrolytic capacitor in this air conditioner contains the start capaci-
tor
for the compressor motor and the start capacitor for the fan motor.
ACCESSING THE COMPONENT COMPARTMENT
1.
Disconnect power from the air conditioners.
2.
Remove the air conditioner from its installed position.
3.
Remove the three (3) Phillips head screws securing the curtains to each side of the air condi-
tioner.
(Fig. 3-6) Slide the curtains from the channel rails at the top and bottom of the air condi-
tioner.
4.
Remove the three (3) Phillips head screws securing the top channel rail to the top of the air
conditioner.
(Fig. 3-6)
5. Remove the four (4) Phillips head screws securing the top of the component compartment to the
air conditioner.
(Fig. 3-7)
6. Discharge the dual-capacitor with a 20,000 ohm resistor.
INSET
Removing the Fan Motor Assembly
1.
Remove the four (4) screws securing the
front panel.
(Fig. 3-8)
2.
Disconnect the wiring harness connectors
from the control panel wiring plugs.
(Fig. 3-8, INSET)
Fig. 3-6
Fig. 3-7
Fig. 3-8
15
Section Four
DIAGNOSIS and TROUBLESHOOTING
COMPONENT TESTING
!
WARNING
ELECTRICAL SHOCK HAZARD
• Disconnect power before servicing the air conditioner.
• Replace all panels before operating the air conditioner.
Failure to do so can result in death or electrical shock.
TEST PROCEDURE
RESULTS
COMPONENT
CAPACITOR
COMPRESSOR
FAN MOTOR
ELECTRONIC
CONTROL BOARD
Set a volt-ohmmeter to the Rx1 scale. Dis-
connect all wire leads. Discharge Capacitor.
1.
Place probes on F and C terminals.
2.
Place probes on H and C terminals.
Set volt-ohmmeter to Rx10 scale.
1.
Place probes on each terminal and
outer case of capacitor.
Set a volt-ohmmeter to the Rx1 scale. Dis-
connect all wire leads.
1.
Place the probes on the R and C
terminals.
2.
Place the probes on the S and C
terminals.
Set a volt-ohmmeter to the Rx10 scale.
1.
Place probes on each terminal and
outer case of compressor.
Set a volt-ohmmeter to the Rx1 scale.
Disconnect all wire leads.
1.
Place probes on the BK and BR
motor terminals. (Phase Winding
and Overload)
2.
Place probes on R and W.
3.
Place probes on BK and W.
4.
Place probes on BL and W.
Set volt-ohmmeter to Rx10 scale.
1.
Place probes on each terminal
(except W) and motor housing.
There are no test points at the control board.
all soldered edge connections are covered with
a silicone sealant.
1.
Meter should deflect momen-
tarily and then show some mini-
mal resistance.
2.
Meter should deflect momen-
tarily and then show some mini-
mal resistance.
1.
Meter should read infinity.
1.
See Table 1 (page 19).
2.
See Table 1 (page 19).
1.
Meter should read infinity.
1.
See Table 2 (page 19). If phase wind-
ing is shorted, meter will read no resis-
tance. If overlaod is open, meter will read
infinity.
2.
See Table 2 (page 19).
3.
See Table 2 (page 19).
4.
See Table 2 (page 19).
1.
Meter should read infinity.
The control board is powered by 115 VAC.
Output from the control board to the
compresor, condenser fan motor and ca-
pacitor is 115 VAC.
