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TM 10-4320-342-24
2-33. PRESSURE SWITCH REPLACEMENT - continued.
b.
TEST AND ADJUSTMENT. Refer to Figure 2-54.
NOTE
If your unit does not have air regulating capability, refer to Direct Support
Maintenance for test and adjustment.
Test adjustment of pressure switch to ensure continuity exists between pins A and B at 20 psi as follows:
NOTE
Pins are identified with a letter in the receptacle.
a.
Connect the positive lead (1) to pin B and negative lead (2) to pin A on receptacle (3). At 0 pressure, continuity
should be present.
b.
Connect a regulated air source to the inlet (4) of pressure switch (5).
c.
Apply air pressure until continuity is achieved between pins B and C. Record the pressure at which continuity
was achieved.
d.
If pressure is greater than 22 psi, proceed as follows:
(1)
Connect pressure switch to a 20 psi pressure source. Connect multimeter leads to pins B and C.
(2)
Lift tab (6) and rotate the name plate (7) to expose the adjustment ring (8) and locking setscrew (9).
(3)
Remove the locking setscrew (9).
(4)
Insert tip of a pointed object (ink pen) in hole (10) and rotate adjustment ring (8) until continuity is broken.
(5)
Install the locking setscrew (9).
(6)
Rotate name plate (7) to cover the adjustment screw (8) and set screw (9).
e.
If pressure was less than 18 psi, proceed as follows:
(1)
Connect pressure switch to a 20 psi pressure source. Connect multimeter leads to pins B and C.
(2)
Lift tab (6) and rotate the name plate (7) to expose the adjustment screw (8) and locking setscrew (9).
(3)
Remove the locking setscrew (9).
2-137
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