PVI Industries QUICKDRAW PV500-26 - Manual (Page 13)

QUICKDRAW

Boiler Water Heater
13
PV500-26 06/12
7.6 Checking and Adjusting 3-Way Valve Operation
1. Check Operation:
a. Remove indicator screw and indicator.
b. Remove cover screws (2). Remove cover.
c. Apply power to actuator drive motor.
d. Notice actuator rotation, valve stem direction and linkage cam direction. (Should drive CW and valve stem
down.)
2. To Reverse Operation:
a. Turn off power supply. (Actuator should drive CCW.)
b. Remove actuator mounting screws (3).
c. Slide actuator back on mounting bracket and remove cam from actuator shaft.
d. Lift valve stem and plunger assembly to full upward position.
e. Install the cam onto the actuator shaft with the cam-lobe facing up.
f. Reposition actuator and install the mounting screws.
g. Apply power to actuator. (Should drive CW rotation and stem down.)
h. Install cover and screws.
i. Install indicator, with screw, pointing toward open.
3. Adjust Valve Stem:
a. Loosen stem locknut.
b. Screw valve stem into stem extension until valve has contacted at top of valve stroke.
c. Screw valve stem into extension and additional 1½ turns.
d. Cycle heater with thermostats to confirm proper operation.
Typical Components for Valve Installation of Standard Actuator