PRESSURE SWITCH (CONT.)
Inspect for damage.
Repair or replace if damaged.
a. Using a multimeter check for continuity between
pins, A-B, T1-T2, L1-A and L2-B.
If continuity does not exist pressure switch is
Repair or replace if defective.
Gauges on pressure switch are not accurate. DO NOT rely on readings.
a. Remove one screw securing pressure switch
cover to pressure switch .
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).
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.
Low pressure switch must be activated for testing and adjustment
of high pressure switch.