TM 10-8145-222-23
0019
TEST CONTINUED
Figure 1. High Pressure Cutout Switch Test Setup.
WARNING
Dry nitrogen cylinder pressure is approximately 2350 psi. Do not use a nitrogen
cylinder without using a pressure regulator.
Use of oxygen may cause an explosion that could cause serious injury or death to
personnel. Do not use oxygen in or around a refrigerant system.
3. Connect an ohmmeter across cutout switch terminals.
Ohmmeter will indicate continuity with switch closed.
4. Set nitrogen pressure regulator (Figure 1, Item 2) to setting higher than cutout point for switch under test
(469 10 psi is cutout for HP1 or 348 10 psi is cutout for HP2).
Ohmmeter will show no continuity when switch is open.
If either switch fails to open, or opens before reaching cutout point, switch is defective. Replace switch per
this WP.
5. Close dry nitrogen cylinder valve (Figure 1, Item 1).
6. Open bleed-off valve (Figure 1, Item 5).
For HP1, ohmmeter will show continuity when switch closes at 350 10 psi.
For HP2, ohmmeter will show continuity when switch closes at 312 10 psi.
If either switch closes before reaching cut-in point or does not close, switch is defective. Replace switch per
this WP.
7. Disconnect switch from dry nitrogen cylinder.
8. Install applicable high pressure cutout switch in accordance with Replace paragraph.
END OF TASK