Walchem EW-F series Instruction Manual

Contents

Walchem EW-F series Instruction Manual Manual pdf 20 page image

173.4 MultiFunction Valve OperationThe MultiFunction Valve is optional on select E-Class pumps and replaces the standard ManualAir Vent Valve when ordered. It integrates the air venting/bleeding functions with a backpressure and anti-siphon valve.Air Vent / Bleed Function1. Open the air vent by turning the air vent adjustmentknob counter-clockwise one to one and a halfturns.2. Operate the pump until all of the air is purged andonly liquid is discharged from the air vent drain.3. Turn the air vent adjustment knob clockwise until itbottoms out and will not turn further.Back Pressure / Anti-Siphon Valve1. A spring-loaded diaphragm automatically adds30PSI of back pressure to the discharge side of thepump when the air vent adjustment knob is closed.2. If back pressure is not observed, the pressurerelease knob may be in the release position (theknob is resting in its ‘up’ location). If this is thecase, turn the knob clockwise until it ‘clicks’ down(approximately ¼ turn).3. The diaphragm prevents siphoning of chemicalthrough the pump.Pressure Release1. 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 backpressure or ‘down’ position. If this happens, keep turning the knob clockwise until it ‘clicks’ onetime in the release (‘up’) position. Note: To avoid damage, do not turn the knob counter-clockwise.3. Turn the air vent adjustment knob counter-clockwise one or one and a half turns to release thepressure in the discharge tubing/piping through the air vent drain. The air vent drain shouldalways be plumbed back to the supply tank or to safe disposal. Do not submerge the air ventdrain tubing under chemical in the supply tank.CAUTION: Confirm that liquid is discharged from the air vent drain. If the liquid is notdischarged, the pressure may not be released. If this is the case, repeat the Pressure Releaseprocedure.Air VentDrainPressurereleaseknobLiquidDischargePortAir VentAdjustmentKnobLockNut