27
3.8 MultiFunction Valve Operation
The MultiFunction Valve is optional on select EH and EZ pumps and replaces the
standard Manual Air Vent Valve when ordered. It integrates the air venting/bleeding
functions with a back pressure and anti-siphon valve.
Air Vent / Bleed Function
1. Open the air vent by turning the air vent
adjustment knob counter-clockwise one
to one and a half turns.
2. Operate the pump until all of the air is
purged and only liquid is discharged from
the air vent drain.
3. Turn the air vent adjustment knob
clockwise until it bottoms out and will
not turn further.
Back Pressure / Anti-Siphon Valve
1. A spring-loaded diaphragm automatically
adds 30PSI of back pressure to the
discharge side of the pump when the air
vent adjustment knob is closed.
2. If back pressure is not observed, the
pressure release knob may be in the release position (the knob is resting in its ‘up’ location).
If this is the case, turn the knob clockwise until it ‘clicks’ down (approximately ¼ turn).
3. The diaphragm prevents siphoning of chemical through the pump.
Pressure Release
1. Stop the pump operation.
2. Turn the pressure release knob clockwise until it ‘clicks’ into the release or ‘up’ location
(approximately ¼ turn). If the knob is turned too far, it will ‘click’ again return to the back
pressure or ‘down’ position. If this happens, keep turning the knob clockwise until it ‘clicks’
one time in the release (‘up’) position.
3. Turn the air vent adjustment knob counter-clockwise one or one and a half turns to release
the pressure in the discharge tubing/piping through the air vent drain. The air vent drain
should always be plumbed back to the supply tank or to safe disposal. Do not submerge the
air vent drain tubing under chemical in the supply tank.
CAUTION:
Confirm that liquid is discharged from the air vent drain. If the liquid is not
discharged, the pressure may not be released. If this is the case, repeat the
Pressure Release procedure.
Air Vent
adjustment
knob
Air Vent
drain
Summary of Contents for EH Series
Page 46: ...Notes...
