inlet.
A dial pointer shall indicate each step of the operation.
2.24.3.3
Backwash and Brine-Rinse Control
Adequate means shall be provided for automatically controlling the rate of
backwashing and brine rinsing. Wash and rinse water shall discharge into
an open sump or other suitable drain. The controls shall be entirely
automatic in operation and shall accurately regulate the rate of backwash
and brine rinse as recommended by the softener manufacturer.
2.24.4
Accessories
2.24.4.1
Pressure Gauges and Sampling Cocks
Each softener unit shall be provided with a duplex pressure gauge, or two
single pressure gauges, connected to the hard-water inlet and the
soft-water outlet, to indicate pressure loss through softener when in
operation. The pressure loss through the softener, plus its pipe, valve,
and fitting assembly when delivering the indicated amount of water per
softener unit, shall not exceed 69 kPa 10 psi. Sampling cocks shall be
furnished for both the hard and soft water.
2.24.4.2
Automatic Hardness Tester
A device for automatically testing the hardness of the water shall be
installed in the soft-water line leading from each softener unit. The
automatic hardness tester shall be suitable for wall mounting and shall be
capable of carrying out intermittent tests on the softener water and of
giving visual warning that the residual hardness present exceeds a
predetermined limit. The tester shall be equipped with necessary wiring
and electrical controls to initiate automatic regeneration.
2.24.4.3
Water Meters
Each softener shall be provided with displacement-type water meter reading
in liters and U.S. gallons U.S. gallons. The meter shall be equipped with
necessary wiring and electrical controls to initiate automatic regeneration
when the softener unit has delivered the indicated amount of water. The
meter contacts shall be adjustable to permit setting to suit actual
hardness of the water being tested. The meter shall be installed in the
soft-water line from the softener unit and shall be located so as to be
readily accessible for reading and setting.
2.24.4.4
Water-Testing Equipment
A complete water-testing set furnished by the manufacturer shall be
provided with the water softener assembly, with complete instructions for
conducting either the American Public Health Association test or other
suitable test for hardness. Two Baume hydrometers, calibrated for the
range necessary for testing saturated brine solution, and three glass
cylinders of heat-resistant glass to hold sufficient brine for testing
shall be provided.
PART 3
EXECUTION
3.1
GENERAL INSTALLATION REQUIREMENTS
Piping located in air plenums shall conform to NFPA 90A requirements.
Plastic pipe shall not be installed in air plenums. Piping located in
SECTION 15405A
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