Pentair S7D75, S8D110 owner manual Cleaning The Filter, When to Clean, Filter Backwash Procedure

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5 4

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FIGURE 4 - 21" Filter clamp tighten- ing sequence.

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3 4

8 6

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FIGURE 5 - 25" Filter clamp tight- ening sequence.

CLEANING THE FILTER

When to Clean:

NOTICE: If installation does not allow backwashing, use manual cleaning proce- dure regularly (see Page 10).

1.With a new filter:

A.Record filter operating pressure at startup. When pressure reaches 15 PSI (103kPa) above startup operation pressure, stop pump for 15-30 seconds to allow filtering cake to release.

B.Restart pump to form new cake. Pressure should now be less than 10 PSI (69kPa) above startup operating pressure.

C.If pressure is still more than 10 PSI (69kPa) above startup operating pressure, backwash filter (see below).

2.Thoroughly clean air relief filter screen (Key No. 2, Page 15) on top of manifold EVERY time filter is opened. Be sure to remove all debris from screen. Replace filter screen if damaged.

3.At least twice a year, manually clean filter according to instructions, Page

10.At least once a year, follow instructions under "Chemical Filter Cleaning Procedure", Page 11, as well.

Filter Backwash Procedure:

To prevent equipment damage and possible injury turn pump OFF before changing valve position.

NOTICE: Before backwashing with a separation tank, review separation tank own- er's manual for instructions.

1.Stop pump.

2.Change valve position.

A.If using Multi-port Valve, set to backwash position.

B.If using Two Position Slide Valve, raise handle to fully extended position.

3.Start pump, circulating water backwards through filter to flush cake and con- taminants into separation tank or waste.

4.If system has a sight glass, backwash until water in glass runs clear.

5.If system does not have a sight glass:

A.Backwash one minute.

B.Stop pump; reset valve to 'FILTER' position.

Stop pump before changing valve setting!

C. Restart pump; filter for 20 seconds.

D. Repeat steps A, B, C three times. Cycling is effective when cake and con- taminants are difficult to break and flush out of filter.

NOTICE: Do not vacuum pool while backwashing filter.

6.Stop pump.

7.Open air release valve and release ALL pressure from tank and system.

8.Follow 'Disassembly' procedure, Page 8, to remove top of filter.

Hazardous pressure. Risk of severe personal injury and major property damage if tank is opened while under pressure or while pump is running.

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