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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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