Figure 3-21. Thermal relay removal and installation.

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

3-22

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

Screw (6)

16. Spacer (2)

Nut (4)

17. Stud (2)

Lock washer (10)

18. Screw (2 )

Termal relay (5)

19. Lock washer (2)

20. Standoff insulator (2)

Figure 3-21. Thermal relay removal and installation.

21. Insulator

3-34