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Figure 4-8.
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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  4-9. Condenser fan and motor assembly, removal and installation
TM 5-4120-361-14 c. Test. Using a multimeter, test for continuity across each pair of ter- minal connections. If continuity is not indicated, the thermal protector is de- fective and must be replaced. (b) Using a multimeter, test for continuity by placing one test probe against the motor housing (on bare metal only) and the other probe against each of the motor winding leads. If  contin- uity is indicated, the winding is grounded and the motor should be re- placed. d. Installation. (1) Refer to figure 4-8, install thermal   protectors. c. Removal. (1) Refer to figure 4-4 and remove the condenser cover and top rear cover. (2) Refer to paragraph 4-21e and install evaporator fan and motor assem- bly. (2) Refer to figure 4-9 and remove the condenser fan and motor assembly. 4-23. Condenser Fan and Motor Assem- bly. d. Installation. a. General. The condenser fan mo- tors are multispeed motors. The 400 HZ motors operate at 3750 RPM in high speed and 1800 RPM in low speed. The 60 Hz motors operate at 3450 RPM in high speed and 1725 RPM in low speed. The motors contain separate windings for high or low speed operation and each winding is thermally protected. Motor speed is au- tomatically controlled by an outdoor thermal switch (figure 1-2). The motors will operate at low speed until the out- door ambient temperature rises above 100°F ±5°F (37.8°C ±3°C). (1) Refer to figure 4-9 and in- stall the condenser fan and motor assem- bly . Refer to figures 1-4 and 1-5 for electrical connections. (2) Refer to figure 4-4 and in- stall the condenser cover and top rear cover. 4-24. Condenser Fan Motor Thermal Pro- tector. a. General. There are two automatic reset thermal protectors on each of the condenser fan motors. Both thermal pro- tectors are similar in appearance. One of the protectors provides overload pro- tection for the high speed motor wind- ings and the other provides overload protection for the low speed motor wind- ings. b. Test.   Before removing a conden- ser fan motor,   test mode selector switch and control circuit breaker (para 4-26) and the fan motor high/low speed switch (para 4-27) that control operation of the condenser fan motor. If  electrical control components or wiring that supply power to the motor are not defective and the motor does not operate, remove the condenser fan and motor assembly (c. below) and make the following tests: b. Removal. (1) Test the high and low motor winding thermal protectors, as in para 4-24c. Replace a defective protector (para 4-24c). (1) Refer to paragraph 4-23 and re- move the condenser fan and motor assem- bly. (2) Refer to figure 4-8 and remove the thermal protector. (2) With the high and low speed mo- tor winding leads disconnected from the thermal protectors, test for open or grounded windings as follows: c.   Test. Using a multimeter, test for continuity across each terminal con- nection. If continuity is not indica- ted, the thermal protector is defective (a) Using a multimeter, test for continuity across a combination of two leads until each of the three high speed winding leads is tested. DO the same for the three low speed winding leads. If continuity is not indicated, the winding is open and the motor should be replaced. and must be replaced. d. stall Installation. in- 4-17 (1) Refer to figure 4-8 and the thermal protector.

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