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CHAPTER 5
: MULTIPORT VALVE OPERATION
1.
Filter
: Position for filtering the body of water.
Incoming water from the piping system is
automatically directed by the Multiport Valve to the
top of the filter bed. As the water is pumped through
the filter sand, dirt and debris are trapped by the
filter bed, and filtered out. The filtered water is
returned from the bottom of the filter tank, through
the Multiport Valve and back through the piping
system.
2.
Backwash
: Position for cleaning the filter media.
Water flow is reversed by the Multiport Valve
through the filter bed so that water flow is directed
to the bottom of the tank and up through the filter
bed, flushing the previously trapped dirt and debris
out the waste line.
3.
Rinse
: Position for flushing the filter system.
The water flow is directed by the Multiport Valve
through the filter bed and out the waste line. This
process settles the filter media bed into place and
ensures any dirt or debris is rinsed out of the filter,
preventing possible return to the Swimming Pool or Spa.
4.
Waste
: Position for bypassing the filter bed to
Waste. The water flow is directed by the Multiport
Valve straight to the backwash outlet, bypassing the
entire filter bed. This Multiport Valve position is used
to lower the water level or for vacuuming water with
high dirt loads.
NOTE
:
This position is not available
on 4-Way Multiport Valves.
5.
Re-circulate
: Position for bypassing the filter bed
to the Swimming Pool or Spa. The Mulitport Valve
recirculates water flow directly back to the Pool or
Spa, bypassing the filter.
NOTE
:
This position is not
available on 4-Way Multiport Valves.
6.
Closed
: Position for closing all flow to the filter.
This position is not to be used with the pump
operating.
NOTE
:
This position is not available on
4-Way Multiport Valves.
CAUTION: Operation of
the Multiport Valve or mode selection is to be
always done with the pump switched off.
CHAPTER 6
: BACKWASHING
The function of backwashing is to separate the
deposited particles from filter media grains and flush
them from the filter bed. Backwashing is achieved by
reversing the flow of water through the filter bed at a
fairly high flow rate. This high flow rate expands the
filter bed and the water collects the debris taking it to
waste.
Conditions for Backwashing
Time for backwashing is determined by the following
conditions:
1. The flow rate through the filter bed decreases until
it is insufficient to meet the demand.
2. The removal efficiency of the filter bed decreases
to the point where the effluent quality deteriorates
and is no longer acceptable.
3. When the pressure gauge reading is 7.2 PSI
higher than the start up pressure.
4. If the filter is connected to mains water, pressure rise
is not an accurate indicator as mains pressure
tends to fluctuate. It is best to rely on the actual flow
rate.
NOTE
:
We recommend that you backwash
a swimming pool sand filter in a residential
installation at least once a month.
Importance of Backwashing
The importance of backwashing cannot be overstated.
Dense filter media can become “packed” without
proper and frequent enough backwashing. Debris
will remain trapped and create channeling within the
filter bed. This will result in the filter bed exhausting
early. Moreover, if debris is not flushed from the media
grains, the filter bed will become dirtier and dirtier as
time goes on until the filter operation fails.
Backwashing Instructions
1. Switch off the Pump. Close the Inlet Valve.
NOTE
:
If a pump is installed, switch the pump on and off,
instead of closing and opening the Inlet Valve.
2. Release the filter’s pressure by loosening Pressure
Release Valve until the Pressure Gauge needle
drops to zero <0>.
3. Retighten Pressure Release Valve.
4. Depress and turn Handle 180º to the BACKWASH
position. In the BACKWASH position, the water
flow is automatically reversed through the filter so
that it is directed to the bottom of the filter vessel,
up through the sand, flushing the previously trapped
dirt and debris out the waste line.
5. Switch on the Pump. Open the Inlet Valve.
Backwash water will flow out through drain pipe.
6. When the backwash water in the sight glass
appears clear, Switch off the Pump. Close the Inlet
Valve.
Backwash
Filter
Close
W
aste
Recirculate
