Leslie Controls Pilot Controller User Manual
Page 9
Page 9
SECTION II — OPERATION
PROCEDURE:
Follow Steps 1 and 2 then proceed with
Steps 3 through 5 whichever applies to the particular service.
1.
Close inlet and outlet stop valves around the control
valve.
2.
Open air supply line stop valve. Adjust 1/4" reducing
valve to supply 20-22 psig pressure to control pilot.
For Pressure Reduction Installation
3.
Turn adjusting nut of Pilot Controller Until diaphragm
control valve is wide open.
4.
Open outlet stop valve partially and control pipe stop
valve fully.
5.
Open inlet stop valve slowly, until Pilot Controller takes
hold and starts to close the diaphragm control valve.
Screw adjusting nut upward to increase, downward to
decrease the controlled pressure. After desired con-
trolled pressure is obtained, open inlet stop and outlet
valves fully.
For Overflow Relief Installation
3.
Turn adjusting nut of Pilot Controller until diaphragm
control valve is closed.
4.
Open inlet, outlet, and control pipe stop valves fully.
5.
Turn adjusting nut of Pilot Controller so that diaphragm
control valve starts to open when desired inlet pressure
is exceeded.
Differential Pressure Pilot Controllers
3.
Turn adjusting nut of control pilot to adjust compression
on adjusting spring until control valve is wide open.
4.
Open outlet stop valve partially and control pipe stop
valves fully.
5.
Open inlet stop valve slowly, until controller takes hold
and begins to close the control valve. Readjust the
adjusting nut of the control pilot to obtain desired differ-
ential. To increase differential, when highest pressure is
on top of diaphragm, screw adjusting nut upward; to
decrease differential, screw adjusting nut downward.
When highest pressure is on underside of diaphragm
screw adjusting nut upward to decrease differential;
downward to increase. After desired differential setting
is obtained, open inlet and outlet stop valves fully.
NOTE: When systems are in full operation, use caution in cut-
ting a controller in so that system differential will not be dis-
turbed.
Figure 13. — Drawing showing Direct Acting Type Pilot
Controller (PDA-1, etc.).
Figure 14. — Partial Drawing showing lever and lever pin,
etc., in lever action Types (PRA-1, etc.,).
DO NOT DISTURB SETTING
OF THIS PIN