TM 9-4120-408-14
5-23. EVAPORATOR LOW PRESSURE SWITCH MAINTENANCE. (Continued)
(3) Adjust low pressure switch S5 (2) pressure settings by rotating adjusting screw on rear of low pressure
switch S5 (2).
(4) Refer to b and retest low pressure switch S5 (2).
(5) Replace defective switch.
(6) Position low pressure switch S5 (2) in evaporator housing (10) and secure with two screws (9).
(7) Secure low pressure switch S5 (2) electrical leads with cushion clamp (8), flat washer (7), new lock washer
(6), and nut (5).
d.
Remove.
WARNING
Refrigerant temperatures and pressure may cause severe personal injury.
Do not disconnect switch
sensors without recovering refrigerant first.
(1) Remove four nuts (5), lock washers (6), flat washers (7), and cushion clamps (8). Discard lock washers
(6).
(2) Remove and discard tiedown straps as required.
(3) Loosen flare nut (11) and disconnect capillary tube (1) from suction line tube assembly (12).
(4) Remove two screws (9) and low pressure switch S5 (2).
e.
Install.
(1) Position low pressure switch S5 (2) in evaporator assembly (10) and secure with two screws (9).
NOTE
When installing tape on capillary tube, ensure tape edges overlap and no portion of capillary tube is
exported to air.
.
(2) If new low pressure switch S5 (2) is being installed, wrap capillary tube (1) with new tape. Otherwise
replace tape as required.
NOTE
If new low pressure switch S5 is being installed, install flare nut on capillary tube and flare tube 450.
(3) Install capillary tube (1) on suction line tube assembly (12) and secure with flare nut (11).
(4) Position capillary tube (1) in four cushion clamps (8) and secure with four flat washers (7), new lock
washers (6), and nuts (5).
(5) Coil excess length of capillary tube (1) and secure with new tiedown straps as required.
5-56