|
| |
ARMY TM 9-4120-381-14
NAVY EE-000-CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
5-23
HIGH REFRIGERANT PRESSURE SWITCH (S4).
This task covers:
Inspection
Removal
Testing/Adjustment
Installation
INITIAL SETUP:
Tools
Tool kit, service, refrigeration unit (Item 1, Appendix B)
Personnel: 1
Materials:
Rags (Item 12, Appendix E)
Nitrogen, technical (Item 14, Appendix E)
Varnish, moisture and fungus resistant (Item 16, Appendix E)
Equipment Conditions:
WARNING
Disconnect input power to the air conditioner before performing any internal maintenance. Voltages
used can KILL. Shutting the unit off at the control panel does not disconnect unit power.
1.
Disconnect air conditioner input power at source.
2.
Remove right front condenser panel (para 4-28).
3.
Purge compressor (para 5-20).
INSPECTION
1.
Check that switch and cover are not dented, broken or cracked, replace switch and cover, if defective (see Figure 5-
12).
2.
Check bracket is not dented, broken or cracked. Replace bracket, if defective.
3.
Check that wire leads are properly connected (see Figure FO-3).
REMOVAL
1.
Remove cover (2).
2.
Tag and disconnect leads.
3.
Remove pressure line (6) from valve head of compressor (5/8" wrench).
4.
Remove two screws (4), four flat washers (5) and (7), two locknuts (8), and clamps (9).
5.
Remove screw and clamp from compressor electric box.
6.
Remove two screws (12), flat washers (10), and lockwashers (11).
7.
Remove switch (3).
TESTING/ADJUSTMENT
1.
Using multimeter, check continuity between two lead terminals. If continuity is indicated (switch closed), switch is
defective. Replace switch.
2.
Connect manifold blue hose to nitrogen cylinder.
3.
Connect yellow 1/4 inch (0.64 cm) hose to pressure line (6).
4.
Using multimeter, switch should close at 425 to 475 psig (30 to 33 kg/cm2) and open at 335 to 385 psig (24 to 27
kg/cm2).
5.
If switch can not be adjusted to ranges in step 4, replace switch.
5-45
|
