Culligan Model 900 - Manual (Page 11)

Culligan Hi-Flo ® 52 Softener Engineer’s Specification Page 3
¨ (Steel vessel)
4.1.4 Tank Finish – Interior
Tank interior shall have near white sandblast and be coated to 8 to 10 mil DFT with an epoxy phenolic designed
specifically as a high chemical resistant, non toxic, odorless protective coating. The lining shall meet the
requirements of the US Federal Register, Food and Drug Regulations, Title 21, Chapter 1, Paragraph 175.300.
4.2 INTERNAL DISTRIBUTION
4.2.1 The upper distribution system shall be of the baffle type to dispense water laterally to avoid channeling within
the resin bed.
¨ (20” models, 24” FG models)
4.2.2 The lower distribution system shall be of the single point distributor type, constructed of PVC pipe and a fine
slotted strainer to provide even flow distribution through the resin bed. The distribution system shall be
embedded in a two layer subfill of washed inorganic material to support the resin bed.
¨ (24” steel models, 30” and larger models)
4.2.2 The lower distribution system shall be of the hub and radial arm type, constructed of PVC pipe, a hub radial and
individual distributors arranged for even flow distribution through the resin bed. No distributor slots will face
upwards to minimize the opportunity for channeling. The distribution system shall be embedded in a single layer
subfill of washed inorganic material to support the resin bed.
4.3 MAIN OPERATING VALVE
The main operating valve shall be of a top mount design constructed of corrosion resistant alloy material and
sized with 2 inch NPTI inlet and outlet connections. The main operating valve will have provision for either left-to
right or right-to-left plumbing flow to simplify installation while maintaining a forward facing timer for ease of
service.
Hard-coat anodization of the valve shall be mandatory. The hard-anodized layer will be 2 mil in thickness or
greater and shall be final coated with a flouroplate polymer to further enhance corrosion resistance. The valve
shall be capable of passing a 1000 hour/5 percent salt spray test without signs of corrosion. The valve finishing
process shall be considered by the USEPA to be an environmentally friendly process. The valve body material
shall be considered as generally safe by the USFDA.
The main operating valve will provide water to service through two smooth-port diaphragm valves. The
diaphragm valves shall be slow opening and closing, free of water hammer. Regeneration will be controlled
through two (2) plastic pistons operating through Teflon® seals.
The main operating valve shall incorporate self adjusting flow regulators to control the rate of flow and prevent
resin loss during backwash, brine/rinse and fast rinse/refill steps of regeneration, regardless of system pressure
fluctuations between 30 and 100 psi.
The main operating valve shall be designed and manufactured by the same manufacturer as the water softener
system.
¨ (Single units only – hard water bypass)
The unit shall be supplied so that the valve will allow automatic bypass of untreated water during regeneration.
The bypass shall be integral to the main operating valve body and be capable of being easily modified to
prevent hard water bypass.
¨ (Single units only – NO hard water bypass)
The unit shall be supplied so that the valve will not allow automatic bypass of untreated water during
regeneration. The bypass shall be integral to the main operating valve body and be capable of being easily
modified to allow hard water bypass.
More