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Rectifier and Capacitors
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
Installation. - TM-5-4120-361-14_73
TM 5-4120-361-14 c. Inspection and Test. (1) Inspect rectifier and both ca- pacitors for cracked or broken case and signs of overheating. Replace if scorched or blistered, or if case is damaged. (2) Using the ohms function of a multimeter,   measure the resistance be- tween the + and   - terminals of the rec- tifier: (a) With the + lead of the meter on the -   terminal of the rectifier and the -   lead of the meter on the + termi- nal of the rectifier, conductivity should be indicated. (b) Reverse the meter leads to the  rectifier;   meter should indicate an open circuit (infinity). (c) Replace rectifier if measure- ments differ from those given in (a) and (b). (3) Using multimeter, test capaci- tor  for  continuity. Replace capacitor if  continuity  exists. d. Installation. (1) Refer to figure 4-17 and in- stall rectifier. (2) Refer to figure 1-5 and in- stall capacitors by crimping leads into cable  terminals. (3) Refer to figure 1-5 and attach cable to rectifier. (4) Refer to figure 4-10 and in- stall the junction box. 4-30. Heating Elements and Heater Cut- out  Switch. a. General. A bank of six elements provides heat for the heating mode; three elements are energized in the LOW and all six in the HIGH heat position. Temperature is controlled by thermo- static  cycling. Dangerously high temp- eratures are prevented by the heater cutout  switch. b. Removal. (1) Refer to figure 4-4 and remove top  front  cover. (2) move the box . Refer to figure 4-10 and re- control module and junction (3) move the Refer to fiqure 4-18 and re- heating elements or the heater cutout  switch. c.  Testing. Refer to wiring diagram (figure 1-5) and test across the heatinq element leads for continuity, using a multimeter. If  no  continuity  exists, replace the heating element. Using  a multimeter, test the heater cutout switch for continuity between terminals 1 and 2 (also between terminals 3 and 4). If no continuity exists, replace the heater cutout switch. d. Installation. (1) Refer to figure 4-18 and in- stall the heating element or heater cut- out  switch. (2) Refer to figure 4-10 and in- stall the junction box and control mod- ule. (3) Refer to figure 4-4 and in- stall the top front cover. 4-31. Thermostatic   Switch. a. General. The thermostatic switch automatically changes the condenser fan speed by sensing ambient temperature. With the ambient temperature at 95°F (35°C)  or  below,   the condenser fan will run at low speed. If the ambient tem- perature rises to approximately 105°F (40.6°C), the condenser fan will run at high  speed. Conversely, if the fan is running at high speed and the ambient drops to approximately 95°F (35°C), the fan will run at low speed. b. Testing. If no speed change is noted (change in noise level) during operation, when the ambient temperatures change as described in paragraph a. above, the switch is defective and must be  replaced. c. Removal. (1) Refer to figure 4-4 and remove top  front  cover. (2) Refer to figure 4-19 and re- move thermostatic switch. 4-28

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