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2.1 Operating the Tandem Lateral Three-Way Diverter Valves:
2.1.1 Depending upon the initial position of the "T"-handle, turn the "T"-handle either clockwise, or counterclockwise, until the arrow on the top
surface of the "T"-handle points directly at the vessel to which flow is to be introduced (i.e. the vessel to be turned "on"). (See Figure 2)
2.1.2 To switch flow from Vessel A to Vessel B, SLOWLY turn the "T"-handle counterclockwise until the arrow on the handle points directly at
Vessel B. Fluid will now begin flowing through Vessel B. (Vessel A is now inactive and can be accessed for maintenance or filter bag
change. See Hayward document FLVIOM for instructions for maintaining the vessel, or performing a filter bag change.)
2.1.3 To switch flow from Vessel B to Vessel A, SLOWLY turn the "T"-handle clockwise until the arrow on the handle points directly at Vessel A.
Fluid will now begin flowing through Vessel A. (Vessel B is now inactive and can be accessed for maintenance or filter bag change. See
Hayward document FLVIOM for instructions for maintaining the vessel, or performing a filter bag change.)
2.1.4 The "T"-handle should NEVER be left in an orientation where the arrow is not pointing directly at either Vessel A, or Vessel B.
Operating the tandem lateral three-way diverter valves too rapidly can create excess water hammer effect on the Hayward FLV Series
GFPP Duplex Filter, or on one, or both, of the filter vessels that are part of this unit. Water hammer effect resulting in product failure
can result in property damage, personal injury, or even death. To avoid creating excess water hammer effect in the Hayward FLV Series
GFPP Duplex Filter, ALWAYS operate the tandem lateral three-way diverter valve "T"-handle SLOWLY when operating the valve, and
thereby changing flow, from Vessel A, to Vessel B, or from Vessel B, to Vessel A, as defined in Figure 1 and Figure 2 of this document.
2.2 Installing a Bag and Basket:
For instructions on installing a bag and basket into the individual vessels on the Hayward FLV Series GFPP Duplex Filter, please refer to the
Installation, Operation and Maintenance Instructions for the vessel, Hayward document FLVIOM, provided with this unit.
2.3 Filling and Pressurizing the Duplex Filter:
2.3.1 To fill and pressurize Hayward FLV Series GFPP Duplex Filter:
NOTE:
For complete instructions regarding the preparation, filling and pressurization of the individual filter vessels on this unit,
please refer to Hayward document FLVIOM, also provided with this unit. Some steps are repeated here for convenience.
2.3.1.2
Verify that cover o-rings, cover o-ring grooves, and cover sealing surfaces of both filter vessels on this unit are clean.
2.3.1.3
Verify that cover o-rings on both filter vessels are seated inside o-ring grooves.
2.3.1.4
Open vent valve on top cover of each vessel; valve is opened by rotating thumbwheel counter-clockwise.
NOTE: Process media will be allowed to escape through outlet of vent valve as vessel is filled. If needed, install ¼" drain
tubing on outlet of vent valve to prevent property damage or personal injury due to contact with process media. Dispose of
vented chemicals properly.
2.3.1.5
Install cover firmly onto each vessel body.
2.3.1.6
Do not strike vessel covers.
2.3.1.7
Do not attempt to over-tighten vessel covers.
2.3.1.8
The filter vessel covers are sealed by means of a pressure energized face sealing o-ring.
approximately 1/8-turn (i.e. 45º). It is not necessary to tighten cover beyond hand tight plus 1/8-turn.
2.3.1.9
Position "T"-handle of tandem lateral three-way diverter valve so that arrow is pointed at the first vessel to be filled first. See section
2.1 above for complete instructions on operation of the diverter valves.
2.3.1.10 Slowly open main shutoff valve upstream of the inlet of the Duplex Filter and start system pump (if necessary).
2.3.1.11 Allow process media to fill the first vessel; air will be purged through vent valve on top of cover. After all air has been purged,
process media will start flowing through vent valve. Close vent valve by rotating thumbwheel clockwise.
2.3.1.12 Allow pressure to slowly increase until system operating pressure is reached in the first vessel.
Open and close valves upstream and downstream of the Hayward FLV Series GFPP Duplex Filter slowly. Rapid increases in
pressure or flow can create excess water hammer effect, resulting in property damage, personal injury, or even death.
2.3.1.13 Carefully inspect the first vessel at cover, end connectors, end caps, and vent valve to verify no leaks are present. If any leaks
are present, shut down system, relieve system pressure, and drain vessel prior to tightening any connections.
2.3.1.14 If no leaks are present on the first vessel, turn the "T"-handle of the diverter valve so that the arrow on the handle points directly at the
second vessel, and initiate flow into the second vessel.
2.3.1.15 Repeat steps 2.2.1.11 and 2.2.1.12, but applied to the second vessel.
2.3.1.16 If no leaks are present on the second vessel, the Duplex Filter is ready for operation.
If either vessel is leaking, never try to stop the leak while vessel is under pressure. Doing so can result in property damage,
Failure to fill either vessel with vent valve installed and open can result in buildup of pressure and compression of air in the
Hayward Flow Control
WARNING
WARNING
WARNING
personal injury, or even death.
WARNING
system, resulting in property damage, personal injury, or even death.
www.haywardflowcontrol.com
Tighten covers hand-tight plus
1-888-HAY-INDL (1-888-429-4635)
FLV4PDUPIOM Rev A 12/21/2017
Pg. 7 of 10
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