Quantcast Figure 3-21. Thermal relay removal and installation.

 

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Figure 3-20. Directional control switch. exploded view
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Figure 3-22. Shunt, exploded view.
b. Test.
(1) Use an oven and thermometer capable of
107C (225F).
(2) Fabricate  extension  leads  for  the
ohmmeter using thin, insulated wire.
(3) Place the thermal relay in the oven with
the extension leads connected. The ohmmeter should
indicate zero.
(4) Increase  the  oven  heat,  observing
temperature using the ohmmeter.  When the relay
opens, the ohmmeter indication changes from zero to
infinity. The relay must open between 102 and 107C
(213 and 225F).
(5) Decrease the heat, observing temperature
and ohmmeter. When the relay closes, the ohmmeter
indication changes from infinity to zero. The relay must
close between 95 and 104C (203 and 219F).
c. Installation.
(1) Mount the thermal relay using the clamp
and attaching hardware. (fig. 3-21.)
(2) Push the two wires onto the relay
terminals (either wire to either terminal).
3-14. Shunt
a. Disassembly.
(1) Tag the electrical wires and cables of the
shunt.
(2) Disassemble the shunt as shown in figure
KEY to fig. 3-22.
1. Screw (2)
2. Lock washer (2)
3. Washer (2)
4. Nut
5. Lock washer
6. Washer
7. Lead
8. Lead
9. Cable nipple
10. Nut
11. Lock washer
12. Washer
13. Lead
14. Clamp (2)
15. Shunt
1.
Screw (6)
16. Spacer (2)
2.
Nut (4)
17. Stud (2)
3.
Lock washer (10)
18. Screw (2 )
4.
Termal relay (5)
19. Lock washer (2)
20. Standoff insulator (2)
Figure 3-21. Thermal relay removal and installation.
21. Insulator
3-34

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