Leslie Controls Pilot Controller - Manual (Page 4)

Page 4
SECTION III - MAINTENANCE
DISMANTLING
(Refer to Figures 6 and 7)
1. Bypass the control valve if system operation is neces-
sary during maintenance work. Shut off air supply to
pilot controller.
2. Take out body screws (36). Slide pilot body assembly
off base in a downward direction away from adjusting
pin (64).
3. Remove bottom plug (47). Remove diaphragm plate (30)
from pilot body by removing capscrews.
NOTE: Do not disturb position of proportional band
parts on diaphragm plate, unless work is required on
them.
Take out diaphragm nozzle disc (29) remove flange ring
(37) and gasket (40). In PRAP types remove nozzle valve
(79) and spring (80).
Cleaning and Reassembling Pilot Body Assembly
1. Wipe all parts clean. Check ports in pilot body, nozzle
and orifice to be sure they are clear. DO NOT use sharp
abrasives. Open air supply and blow out supply line.
2. Replace bottom plug (47) in pilot body. Place gasket
(40) in pilot body. In PRAP types reinsert nozzle valve
(79) and spring (80). Position flange ring (37) with nozzle
upward on gasket (40). Insert flange ring screws and
tighten.
3. Insert diaphragm nozzle disc (29) in pilot body with flat
disc end toward nozzle. Replace diaphragm plate (30)
on pilot body, with knob (76) on the right hand side. If
blade spring (66) was removed from the assembly, be
sure to reassemble it with the preformed end bends
pointing upward.
Cleaning or Replacing Parts in Superstructure
NOTE: If maintenance work is necessary on superstructure
alone, remove pilot body assembly from base as described in
Step 2., Section III then proceed as shown below:
*NOTE: Spring (81) and spring seat (82) are not used in the 50-
800 psig range PRAP Pilot Controller.
Figure 7. Type PDAP Pilot Body Assembly
Figure 6. Type PRAP Pilot Controller (5-80 psig range)