Quantcast Figure 4-26.1. Thermostatic Switches (S2 and S3) - Models EKP and FGG. 4120-01-069-1321)">

 

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Page Title: Figure 4-26.1. Thermostatic Switches (S2 and S3) - Models EKP and FGG.
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Figure 4-26. Thermostatic Switches (S2 and S3) - Model DHF
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TM-5-4120-359-14 Air Conditioner Split Package 18 000 BTU/HR Cooling 30 000 BTU/HR Heating 208 Volt 3 Phase 400 Hertz Manual
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THERMOSTATIC SWITCHES (S2 and S3) (Continued)
TM 5-4120-359-14
c.
Removal - Model EKP
Figure 4-26.1. Thermostatic Switches (S2 and S3) - Models EKP and FGG.
(1) Using screwdriver and wrench, remove the four screws and flat washers, four lockwashers, eight spacers and
nuts, that hold the thermostatic switches to the bracket and to the frame.
(2) Remove the switches and bracket from the unit.
(3) Using screwdriver, tag and remove leads from thermostatic switch.
d. Inspect/Bench test
(1) Inspect for cracks, loose connections, and obvious damage. Replace, if defective.
(2) Tape the bulb of a thermometer or junction of a thermocouple to the body of a thermostatic switch, and
connect the multimeter to terminals one and two. Use a 50 watt bulb or a heat source. Gradually apply heat while
observing both the thermometer and the multimeter. Continuity should drop out at 145 to 155F (63 to 68C). Remove
heat source and let the thermostat cool while observing the thermostat and multimeter.  Continuity should be re-
established at 100 to 120F (38 to 49C).
(3) Repeat step (2) with meter connected to terminals 3 and 4.
Change 5 4-69

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