4 IOM-A-ACV-980-16_680-16 2115
EDP# 1917100
© 2021 Watts
IOM-A-ACV-980-16_680-16 2115
EDP# 1917100
© 2021 Watts 5
Opening Speed Needle Valve Adjustment: While free flow goes
into the lower chamber, the Opening speed flow control restricts
flow out of the upper chamber of the main valve.
If valve opening is too slow, turn the adjustment screw OUT,
counterclockwise, increasing the rate of opening.
If valve opening is too quick, turn the adjustment screw IN, clock-
wise, decreasing the rate of opening.
STEP 6
When pump demand is satisfied, pump will continue to operate
as the main valve closes. To close main valve, de-energize the
solenoid, checking that the main valve closes.
STEP 5
STEP 7
Closing Speed Flow Adjustment: While free flow goes into the
upper chamber, the closing speed flow control restricts flow out of
the lower chamber of the main valve.
If valve closing is too slow, turn the adjustment screw OUT, coun-
terclockwise (See Figure 1B), increasing the rate of closing.
Figure 2
Flow Control
Counterclockwise to INCREASE
the rate of opening
Clockwise to DECREASE
rate of opening
2A
2B
STEP 8
At valve closure booster pump will stop. Adjust limit switch collar
to final position to ensure positive actuation of limit switch elec-
trical contact, if necessary, by sliding up/down to location (See
Figure 3).
Figure 3
Limit Switch in Closed Position
