TM 9-4120-407-14
d. Installation.
(1) Install actuating cylinder (1). Lift links (5) to insert two screws (8) into bracket (9).
(2)
Install two nuts (7).
(3)
Install two new self locking nuts (4).
(4) Connect coupling nut (6).
(5)
Install new refrigerant desiccant dehydrator. See paragraph 4-20.
NOTE
FOLLOW-ON MAINTENANCE:
Install actuating cylinder cover. See para 3-14.
4-22. SAFETY CONTROL BOX (PRESSURE SWITCHES) TESTING AND REPLACEMENT.
c. Installation
b. Removal
This task covers:
a. Testing
INITIAL SETUP
Equipment Conditions:
Tools
Power cable disconnected from input power
Service Refrigeration Unit Tool Kit
connector. See para 3-6.
(Item 1, Appendix B)
Service manifold gauges installed. See para 4-11.
Materials/Parts
Lock Washers, Qty 6 (Item 7, Appendix G)
Insulation Tape (Item 16, Appendix E)
Marker Tag (Item 2, Appendix E)
High voltage is used in this equipment. Be sure power cable is
disconnected prior to performing any maintenance to prevent personal
injury or death.
a . Testing.
(1) High Pressure Switch.
(a) Manifold gauges should read below 470 psig (3243 kPa). If readings are higher than 470 psig,
check refrigerant charge per paragraph 4-18.
(b) Remove six screws (1), lock washers (2), and flat washers (3). Discard lock washers.
(c)
Carefully pull safety control box (4) out far enough to access screws (5).
(d) Remove four screws (5) and carefully pull panel (6) out to access high pressure switch (7).
(e)
Remove two screws (8).
(f) Carefully pull high pressure switch (7) out far enough to gain access to cover (9).
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