STEP 6
When the required level is reached, or if the tank is overflowing,
SLOWLY turn the adjustment screw OUT, counterclockwise, in ¼
to ½ turn increments (See Figure 4). A small amount of water will
discharge from the vent/exhaust line of the Altitude control, signal-
ing the port connection changes of both the Altitude Control and
accelerator. The valve will start closing as indicated by the position
indicator stem movement.
The following is dependent upon the installation/application and
may not be required on all valves: When the valve is closed, the
Altitude control screw adjustment may be turned OUT, counter-
clockwise, an additional ¼ to ½ turn (See Figure 4). This will lower
the shut-off level slightly below the tank over-flow mark, eliminat-
ing any wave action discharge from the over-flow pipe.
Setting the Altitude Pilot
STEP 4
Slowly open the downstream isolation valve.
STEP 5
If the valve remains closed as indicated by the stem position in
the position indicator (See Figure 2) and the tank level is known
to be below the desired level, SLOWLY turn the adjustment screw
IN, clockwise, by ¼ to ½ turn increments (See Figure 3).
This will cause the valve to start opening, filling the tank.
Additional clockwise adjustment may be necessary to raise the
level to the overflow line.
4 IOM-A-ACV-960-13-17_660-13-17 2115
EDP# 1917068
© 2021 Watts
IOM-A-ACV-960-13-17_660-13-17 2115
EDP# 1917068
© 2021 Watts 5
Clockwise to INCREASE
minimum tank level set
point.
Figure 3
Model 27 - Altitude Pilot
Counterclockwise to DECREASE
minimum tank level set point.
Figure 4
Model 27 - Altitude Pilot
Figure 2
Position Indicator Stem in Down Position
Indicating Valve Closed
