Figure 3-11. Circuit breaker linkage detail.

c. Installation. Install the rectifier, control box

installation). Test the circuit breaker for conti-

cover, and front access pane] by reversing the

nuity with a multimeter set on the ohm scale.

order of removal.

Refer to the applicable wiring diagram (fig. 1-3

or 14) for contact points.

3-29. Terminal Blocks

c. Removal. Refer to figure 310 and remove

a. Remove the front access panel (para 315)

the circuit breaker. Refer to figure 3-11 and dis-

and control box cover (para 324).

the circuit breaker. Refer to figure 311 and dis-

b. Refer to figure 310 and remove the terminal

connect the circuit breaker leads as follows:

blocks.

(1) Remove snap ring (1, fig. 3-11) from

pin (4).

3-30. Compressor and Heater Contactors

(2) Pull pin (4) and spacer (3) from switch

a. General. Both of the contractors are located

arm (2).

within the control box. The compressor contactor

(3) Remove linkage rod (6) and connector

starts the compressor and the heater contactor

(5).

energizes the heaters.

d. Installation. Install the circuit breaker, con-

b. Removal.

trol box cover, and front access cover by revers-

(1) Remove the front access panel (para

ing the order of removal.

315) and the control box front cover (para

3-24).

(2) Refer to figure 3-10 and remove the con-

tractors.

c. Installation. Install the rectifier, control

box cover, and front access panel by reversing the

order of removal.

3-31. Outdoor Thermostat

a. General. The outdoor thermostat is mounted

to the rear housing (fig. 12) of the air condi-

tioner. It prevents the compressor from being

started when the outside air temperature is below

50 F. when low condensing and suction and suc-

tion pressures will hamper system operation.

b. Removal.

(1) Remove the condenser fan guard and

fan (para 319).

(2) Tag and disconnect electrical leads con-

necting the outdoor thermostat to the unit.

(3) Remove the two screws mounting ther-

mostat to housing. Remove outdoor thermostat.

c. Testing. Test the thermostat for continuity

with a multimeter set on the ohms scale. Refer to

the applicable wiring diagram (fig. 13/14) for

points to establish contact.

d. Installation. Install the outdoor thermostat,

Figure 3-11. Circuit breaker linkage detail.

fan and fan guard by reversing the order of re-

moval.

3-28. Rectifier

332. Fuse Service

a. Testing.

a. There are two 5ampere fuses located in the

(1) Remove the front access panel (para

control box in the upper right hand corner.

3-15) and control box cover (para 324).

b. Removal. Remove front access panel (para

(2) Using a multimeter, test the front and

315) and control box cover (para 324). Remove

back resistance of the rectifier. A resistance of in-

fuses from fuse holder and replace as required.

finity in both directions indicate an open rectifier

c. Installation. Install the control box cover

that must be replaced.

and front access panel by reversing the order of

b. Removal. Refer to figure 310 and remove

removal.

the rectifier.

3-15