4-662-10630
4.13 CHECKING AND REPLACING CONDENSER
F AN MOTOR BRUSHES
To maintain proper operation of the fan motors, the fan
motor brushes should be checked periodically for
cleanliness and wear .
1
2
1. Brush Cap 2. Brush
Figure 4-4. Fan motor brushes
To check brushes proceed as follows :
a. With unit offand battery disconnected, removebrush
cap (item 1, Figure 4-4.; 2 per motor).
b. Remove brushes (item 2; 2 per motor) and check the
lengthofthebrush.Ifthelengthislessthan1/4inch(6
mm) the brushes should be replaced.
c. Blow out the brush holder with low pressure air to re-
move any carbon dust in the holder. This dust could
prevent a good contact between the brushes and
comutator.
d. Remove the back cover of the motor and inspect the
comutator. If the comutator is heavily grooved, polish
it using fine sandpaper; do not use abrasive paper.
Wipeoutanyaccumulationofgreasymaterialusinga
clean rag dampened with solvent. Reassemble the
motor; install new brushes and replace cap.
4.14 HOT GAS AND CONDENSER PRESSURE
CONTROL SOLENOID VALVES
4.14.1 Replacing Solenoid Coil
It is not necessary to remove the refrigerant charge
when replace the coil (see Figure 4-5.).
a. Remove coil snap cap, voltage plate and coil assem-
bly. Disconnect leads and remove coil junction box if
necessary.
b. Verify coil type, voltage and frequency. This informa-
tion appears on the coil voltage plate and the coil
housing.
c. Place new coil over enclosing tube and then install
voltage plate and snap cap.
1
2
3
4
5
6
7
1. Snap cap
2. Voltage plate
3. Coil assembly
4. Enclosing tube
5. Plunger assembly
6. Valve body assembly
7. Direction of flow
Figure 4-5. Hot Gas or Condenser Pressure
Control Solenoid
4.14.2 Replacing Valve Internal Parts
a. Remove the refrigerant charge. (Refer to paragraph
4.7).
b. Removecoilsnapcap,voltagecoverandcoilassem-
bly. Remove the enclosing tube.
c. Check for foreign material in valve body.
d. Checkfor damagedplunger andO-ring. IfO-ring isto
be replaced, always put refrigerant oil on O-rings be-
fore installing.
CAUTION
Do not damage or over tighten the enclos-
ing tube assembly. Also make sure all parts
are placed in the enclosing tube in proper
sequenceto avoidprematurecoilburn-out.
e. Tighten enclosing tube.
f. Install coil assembly, voltage cover and snap cap.
g. Evacuate, dehydrate and recharge unit. Refer to
paragraphs 4.9.3 and 4.10.2.
h. Start unit and check operation.
123
1. Cap
2. Jam Nut
3. Set Screw
Figure 4-6. Compressor Pressure Regulating
Valve
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