TM 9-4120-408-14
5-20. EVAPORATOR ELECTRICAL LEAD MAINTENANCE. (Continued)
(4)
Install electrical lead (1) on differential pressure switch (2).
(5)
Follow on maintenance:
(a)
Refer to paragraph 5-14 and replace dehydrator.
(b)
Refer to paragraph 5-17 and install evaporator side panel.
(c)
Refer to applicable system technical manual and connect power.
5-21. DIFFERENTIAL PRESSURE SWITCH MAINTENANCE. This task covers:
This task covers:
Remove
Install
Repair
INITIAL SETUP
Tools
Materials/Parts (Continued)
Tool Kit, Service Refrigeration Unit, Appendix B.
Adjustable Hose Clamp, Appendix G. Item 1
Section III, Item 1
Dehydrator, Appendix G. Item 2
Recovery and Recycling Unit, Refrigerant, Appendix B.
Section III, Item 7
Lock Washers, Appendix G. Item 12
Regulator, Nitrogen, Appendix B. Section III, Item 9
Lock Washers, Appendix G. Item 14 (Dehydrator)
Manifold Gage, Charging and Testing, Appendix B.
Refer to TM 9-4120-408-24P for part numbers of items
Section III, Item 16
to be replaced.
Leak Detector, Appendix B. Section III, Item 17
Equipment Conditions
Air Conditioner shut down, paragraph 2-5.
Material/Parts
Brazing Alloy, Appendix E, Item 5
Front (Air Inlet) EMI/RFI Ventilation Panel removed,
Brazing Alloy, Appendix E, Item 6
Evaporator Side panel removed, paragraph 5-17.
Tetrafluoroethane, Appendix E, Item 9
Evaporator Electrical Leads disconnected, paragraph 5-
20.
Flux, Appendix E, Item 11 Nitrogen, Appendix E, Item
18
General Safety Instructions
Do not work on equipment without following standard
shop safety precautions.
CAUTION
Dehydrator must be replaced every time the air conditioner lines are exposed to the atmosphere. Failure
to obey this caution may result in equipment damage.
a.
Remove.
(1)
Remove two screws (Figure 5-17, 1) differential pressure switch (2), and mounting bracket (3).
(2)
Remove hose clamp (1) and tube (5). Discard hose clamp (a).
(3)
Remove two nuts (6), lock washers (7), flat washers (8), bolts (9), and differential pressure switch (2) from
mounting bracket (3).
Change 1 5-48
