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Figure 3-9
3-28
(1) Remove the front access panel (para
3-6).
(2) Refer to figure 3-9 and remove the con-
trol box front panel.
(3) Refer to figure 3-9 and remove the
control panel.
c. Testing. Test the temperature control and
the rotary switch by referring to the electrical
wiring diagram (fig. 1-3 ) for test points.
d. Disassembly. Refer to figure 3-10 and disas-
semble the control panel.
e. Repair. Replace all unserviceable parts with
serviceable like items.
f. Reassembly. Refer to figure 3-10 and reas-
semble the control panel.
g. Installtion. Refer to figure 3-9 and install
the control panel and control box f rent panel.
3-27. Control Box
a. General. The control box houses the fuses,
phase sequence relay,
terminal blocks, circuit
breaker, rectifier, electrical heater contactor, and
compressor contactor.
(1) Remove the front access panel (para
3-6) .
(2) Remove the control box front panel and
control panel assembly (para 3-26).
(3) Refer to figure 3-11 and remove the con-
trol box assembly.
Caution: Remove circuit breaker control
linkage and /or knob before removing the control
box assembly.
c. Installation. Install the control box assem-
bly, control panel, and panels by reversing the
order of removal.
a. General. The phase sequence relay prevents
operation of the motor/compressor unit unless the
phase sequence is correct. With the control cir-
cuit operating properly, 208 volts are fed through
the circuit breaker auxiliary contacts, relay pins
2 and 3, and the fuses into the rectifier.
3-14
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