TM 9-4120-408-14
5-10. CONDENSER PRESSURE SWITCH MAINTENANCE. (Continued)
NOTE
Pressure setting for low pressure fan switch S3 is 160 3psi.
Pressure setting for high pressure fan cut in switch S4 is 190 3psi.
c. Adjust.
(1) Remove four screws (6), lock washers (7), and flat washers (8). Discard lock washers (7).
(2) Rotate bracket (9) and adjust low pressure fan switch S3 (2) pressure settings by rotating adjusting screw
(10) on switch (2).
(3) Retest low pressure fan switch S3 (2) in accordance with b.
(4) Replace defective low pressure fan switch S3 (2) in accordance with d.
(5) Position bracket (9) in condenser assembly (10) and secure with four flat washers (8), new lock washers
(7), and screws (6).
d. Remove.
WARNING
Refrigerant temperatures and pressure may cause severe personal injury. Do not disconnect switch
sensors without recovering refrigerant first.
(1) Remove and discard tiedown straps (11).
(2) Remove spring clip (3) and cover (4) from pressure switch (2).
(3) Loosen flare nut (12) and disconnect capillary tube (1) from tee (13).
NOTE
Remove three nuts, lock washers, flat washers, and cushion clamps when
removing pressure switch S4.
Remove five nuts, lock washers, flat washers, and cushion clamps when
removing pressure switch S6.
(4) Remove four nuts (14), lock washers (15), flat washers (16), and cushion clamps (17). Discard lock
washers (15).
(5) Pull capillary tube (1) through grommet (18).
(6) Remove four screws (6), lock washers (7), flat washers (8), and switch mounting bracket (9). Discard lock
washers (7).
(7) Remove two screws (19) and low pressure fan switch S3 (2).
e. Install.
(1) Position low pressure fan switch S3 (2) on switch mounting bracket (9) and secure with two screws (19).
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