ARMY TM 9-4120-380-14
AIR FORCE TO 35E9-136-21
5 22. LOW REFRIGERANT PRESSURE SWITCH (S4).-Continued
a. Using multimeter check continuity between two lead terminals (5). If continuity is indicated (switch closed),
switch is defective Replace switch
b Connect service manifold blue hose to nitrogen cylinder
c. Connect yellow 1/4-inch (0 64 cm) hose to low refrigerant pressure lime (9)
d Using multimeter, switch should close at 15 to 25 psig (1 to 1 8 kg/cm2) and open at 35 to 45 prig (2 5 to 3.2 kg/
e. If switch cannot be adjusted to ranges in Step d, replace switch.
Drill three 5/32-inch holes m replacement switch terminals (5).
Fungus proof switch per ~L-V-173.
Place switch (4) m mounting position.
Install two screws (3), lockwashers (2), and flat washers (1)
Install two clamps (10) with two screws (7), four flat washers (8), and two locknuts (11)
Install low refrigerant pressure line (9) to compressor
Reconnect wire leads and remove tags.
Install cover (6).
FOLLOW ON PROCEDURES
Connect air conditioner input power at source