TM 9-4120-408-14
5-23. EVAPORATOR LOW PRESSURE SWITCH MAINTENANCE. (Continued)
Figure 5-19. Evaporator Low Pressure Cut Out Switch Maintenance.
b.
Test.
NOTE
Apply pressure a. required using dry nitrogen.
(1) Install pressure gauge of manifold to evaporator assembly (10).
(2) Resistance measurements on low pressure switch S5 (2) will be as follows:
At pressures up to 27 3 psi (186 21 kPa) resistance between contacts 1 and 2 will be 0 and
resistance between contacts 2 and 3 will be infinite.
At pressures above 27 3 psi (186 21 kPa) resistance between contacts 1. and 2 will be infinite and.
resistance between contacts 2 and 3 will be 0.
Replace defective low pressure switch SS (2).
c.
Adjust.
(1)
Remove nut (5), lock washer (6), flat washers (7), and cushion clamp (8). Discard lock washer (6).
(2)
Remove two screws (9) and lower pressure switch S5 (2).
Change 1 5-55