Carrier 60 Service Manual download pdf (Page 42)

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4-9

4.16.2 Inspection And Cleaning

a. At regular maintenance periods, remove brush cov-

ers, examine and clean motor interior.

b. Placemain batterydisconnect switchin OFFposition

and lock.

c. Remove all foreign material. such as dirt and carbon

dust with dry moderately compressed air. Clean by

suction if possible to avoid blowing foreign matter

into the motor.

d. Confirm free movement of brushes to prevent bind-

ing.

e. Examine brush wear and general condition. If bro-

ken, cracked chipped or worn to 1/3 the original

length, replace. Refer to paragraph 4.16.3.

f. Examine the condition of the brush springs. Adiscol-

ored spring is a sign of overheatingwhich may weak-

en the spring. If discolored, replace.

g. Observe condition of communtator and armature

coils

4.16.3 Brush Replacement

a. Placemain batterydisconnect switchin OFFposition

and lock.

b. Remove condenser motor, refer to paragraph 4.16.1.

c. Remove brush covers, remove and inspect brush as-

semblies. Replace if required.

d. Replace brush covers and reinstall condenser motor.

e. To reassemble, reverse the above procedure. Ensure

motor is properl y seated in support.

f. Verify the proper operation of motor.

MOUNTING

CLIP

Figure 4-12. Evaporator Fan Removal

4.17 REPLACING EVAPORATOR F AN

a. Placemain batterydisconnect switchin OFFposition

and lock.

b. Disconnect wire leads to the motor. Mark leads for

proper reassembly.

c. Remove motor by lifting the mounting clip (see

Figure 4-12) up and out. S lide motor from unit.

d. To reassemble, reverse procedure.

4.18 REPLACING RETURN AIR FILTERS

The return air filters are locat ed behind the return air

grill, inside the vehicle.

The filters should be checked for cleanliness

periodically depending on operating conditions. Adirty

filterwill restrictair flowover theevaporator coilwhich

may cause insufficient cooling or heating and possible

frost buildup on the coil. To remove the filters, do the

following.

a. Placemain batterydisconnect switchin OFFposition

and lock.

b. Remove the return air grille.

c. Loosen filter retaining clips and remove the filter

from t he grille.

d. Reverse procedure to install new filters.

4.19 THERMOSTATIC EXPANSION VALVE

The thermostat expansion valve (Figure 4-13) is an

automaticdevicewhichmaintains constant superheatof

the refrigerant gas leaving the evaporator regardless of

suction pressure. The valve functions are: (a) automatic

control of refrigerant flow to match t he evaporator load

and (b) prevention of liquid refrigerant entering the

compressor. Unless the valve is defective, it seldom

requires any maintenance.

1. Power Head

Assembly

2. Equalizer Connection

3. Bulb

4. Gasket

5. Cage Assembly

6. Body Flange

7. Cap screw

Figure 4-13. Thermostatic Expansion Valve

4.19.1 Valve Replacement

a. Pump down low side of the unit. (Refer to paragraph

4.5.1)

b. Remove insulation from expansion valve bulb. (See

Figure 4-13 and Figure 4-14.)

c. Loosen retaining straps holding bulb to suction line

and detach bulb from the suction line.

d. Loosen flare nuts on equalizer line and disconnect

equalizer line from the expansion valve.

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Carrier 60 Service Manual Page 42

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