Table 5-1. Troubleshooting (Con't)
TEST OR INSPECTION
Step 3. Check for defective pressure
a. Shut off outside power source.
switch. If adjustment as outlined in
Step 2 above does not help, repair
b. Tag and disconnect all electrical leads
or replace the pressure switch.
c. Unscrew switch assembly from air
Dry cleaning solvent P-D-680, used to clean parts is potentially dangerous to
personnel and property. Use in a well ventilated area as the fumes are dangerous
if inhaled. Do not use near open flame or excessive heat. Flash point of solvent is
100F. - 138 F. (38 C. - 59 C.).
d. Use compressed air and remove all dust
and dirt from pressure switch components,
then wipe with a cloth dampened in an
approved cleaning solvent.
disassemble the pressure switch assembly.
1. Cover enclosure
6. Bar top
7. Contact board assembly
3. Spring, conical
8. Spring, equalizer
4. Screw, pressure adjusting
9. Spring, main
5. Screw and Nut. differential adjusting
10. Spring, main
Figure 5-6. Pressure switch assembly.