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AIR CONDITIONER FAILS TO HEAT
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TM-5-4120-361-14 Air Conditioner Vertical Compact 18 000 BTU/HR 208 Volts 3 Phase 50/60 Hz (Model 18K 208 3 60) Manual
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Figure 4-8.
TM  5-4120-361-14 Section VII. MAINTENANCE OF AIR CONDITIONER 4-20. Electrical System. This section describes the testing, removal, and installation of the elec- trical system compnents which are the responsibility of organizational main- tenance. Refer to the schematic (figure 1-4) for cmponent nomenclature and as a guide for troubleshooting. use the wir- ing diagram (figure 1-5) to check the exact connections of wiring. 4-21. Evaporator Fan and Motor Assem- bly. a. General. The evaprator fan mo- tor is a multispeed motor. The 400 Hz motor operates at 3750 RPM in high speed and 1800 RPM in low speed. The 60 Hz motor operates at 3450 RPM in high speed and 1725 RPM in low speed. The motor contains separate windings for high or low speed operation and each winding is thermally protected. Motor speed is manually controlled by the evaporator fan speed switch. b. Controls. Before removing the evaporator   fan and motor assembly, test the mode selector switch, evaporator fan speed switch, and control circuit break- er (para 4-26) and evaporator fan motor low/high speed switch (para 4-27) which control operation of the motor. If electrical control components or wiring that supply power to the motor are not defective and the motor does not oper- ate, proceed as follows: c. Removal. (1) Refer to figure 4-1 and remove the evaporator air inlet louver. (2) Refer to fiqure 4-7 and remove the evaporator fan and motor assembly. (3) Refer to figure 4-8 and dis- assemble the fan and motor assembly. Figure  4-7. Evaporator fan and motor assembly, removal and installation 4-15

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