Talley UAC40-5/6-08, Technical Manual

Page: 198 / 353

TM5-4120-375-14
PRESSURE SWITCH (CONT.)
LOCATION/ITEM ACTION REMARKS
INSPECTION
5.
Pressure Switch
a.
Inspect for damage.
b. Repair or replace if damaged.
TEST
6. Pressure Switch
a. Using a multimeter check for continuity between
pins, A-B, T1-T2, L1-A and L2-B.
b. If continuity does not exist pressure switch is
defective.
c . Repair or replace if defective.
ADJUSTMENT
NOTE
Gauges on pressure switch are not accurate. DO NOT rely on readings.
7.
Pressure Switch
a. Remove one screw securing pressure switch
cover to pressure switch .
b. Install wires in accordance with Appendix F.
c. Connect a pressure gauge to the low pressure
sampling tubing and to a cylinder of dry
nitrogen (Item 8, table D-1).
d. Let nitrogen flow into the low pressure sampling
tubing until the pressure gauge indicates 25 psig
(1.75 kg/cm2) activating the low pressure switch.
NOTE
Low pressure switch must be activated for testing and adjustment
of high pressure switch.
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