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SECTION 2.
General Information
2A. Introduction
This manual contains information for the proper
installation and operation of Jandy
TM
Sand Filters.
Procedures in this manual must be followed exactly.
To obtain additional copies of this manual contact us
at 415-382-8220, ext. 237. For address information see
back cover.
2B. Description
Debris is collected in the filter as the water
flows through the multiport valve (MPV), plumbed to
the filter, and directed into the top bulkhead. Dirty
water flows into the diffuser at the top of the tank and
is directed downward onto the top of the filter sand
bed. The debris is collected in the sand bed and the
clean water flows through the laterals and lower
piping at the bottom of the filter up into the lower
bulkhead. Clean water then goes into the MPV and is
returned through the piping system to the pool.
As debris collects in the filter, the pressure will
rise and water flow to the pool will diminish. The
filter will eventually become so plugged with debris
that it will be necessary to perform the backwash
procedure. It is important to know when to backwash
the filter. See Section 4 for further discussion of
backwashing the filter.
Note: A filter removes dirt and other
suspended particles, and does not sanitize the pool.
Pool water must be sanitized and chemically
balanced for clear water.
The filtration system
should be designed to meet local health codes. As a
minimum, the system should turnover the total volume
of water in your pool at least two to four times in a 24
hour period.
2C. General Requirements
1.
For best overall performance locate the system
as close as possible to the pool.
2.
The filter should be located on a level concrete
slab so that the orientation of the valve outlets
are convenient and accessible for the installation
and operation of the unit.
3.
Provide for protection from the weather.
4.
If fitting a chlorinator and/or any other device
into the filtration plumbing circuit, great care
must be exercised to ensure that the appliance is
installed in accordance with the Manufacturer’s
Instructions and any Standards that may exist.
Incorrect application may void product warranty.
5.
Provide barrel unions to each item of equipment
for future servicing of equipment. All Teledyne
Laars/Jandy Products filters come with these
type of fittings.
6.
The maximum working pressure for SF-T &
SF-S filters is 50 psi (for ST-T filters the
maximum working pressure is 35 psi). Never
subject the filter to pressure exceeding
recommended psi, even when conducting
hydrostatic pressure tests.
When performing hydrostatic pressure tests, or
when testing for external leaks of the completed
filtration and plumbing system, ensure that the
maximum pressure the filtration system is subjected to
does not exceed the maximum working pressure of
any of the components within the system.
2D. Sand Requirements
1.
Use a #20 Silica Sand (for pool filter use only),
with a size range of .40-.55mm.
2.
See Table 1 for recommended quantity of sand
required.
3.
Recommended sands:
a.
Wedron Silica/Best Sand Co.
Sand Grade- .45-.55mm
Effective Size- .46mm
b.
U.S. Silica/Silurian Filter Sand
Sand Grade- .45-.55mm
Effective Size- .48mm
Table 1. Quantity of sand required
Model #
lbs.
SF28-T
450
SF30-T
500
SF32-T
600
SF36-T
800
ST20-T
200
ST24-T
300
SF24-S
300
SF30-S
450
SF36-S
800
