8"
2 LB
CHEMICAL
RESISTANT
CHECK VALVE
Part# 888-018
LOOP ABOVE
TO
POOL
CHLORI-
NATOR
FROM
HEATER
The chemical resistant check valve and loop must be in-
stalled with all types of chlorinators to prevent chlorine
migration to the heater. The loop should extend at least 8
inches above the chlorinator top. The chemical resistant check
valve should be placed on the pipe leading "up" to the chlo-
rinator. Therefore, the weight of the water above the check
valve will hold it closed even if the spring is weak or dam-
aged. Mount it as low as possible. Be sure to keep the chlo-
rinator, pump and filter lid o-rings lubricated with silicone
grease to insure a good seal. If it looses its seal, it will allow
the chlorine to migrate to the heater when the system shuts
off. The loss of vacuum allows reverse flow.
19
"Excessive Flow Valve Manifold"
Do not valve in a manner that will totally
isolate heater from water flow see page 25.
EXCESSIVE FLOW BYPASS MANIFOLD FOR LARGE
2 H.P. PUMPS OR OVER 90 G.P.M.
If the pool circulation pump is over 2 HP OR if the total
flow exceeds 90 GPM you will have to add the "excessive
flow valve" as shown here. Do not install a bypass valve
that will completely shut off flow to the heater, see shut-
down procedures.
Some larger water pumps may be restricted if the pipe size is
not adequate therefore reducing its overall flow rate. When
determining if you need an excessive bypass valve, one has to
consider the hydraulic restriction of the filter, valving, amount
of 90˚ fittings and the distance of pipe to the pool in the exist-
ing filtering system. If you have a 2 HP water pump that does
not exceed 90 G.P.M. considering the above, you may not need
the excessive bypass. Excessive water flow can damage the
heat exchanger. SPECIAL NOTE: See chlorinator place-
ment instructions at the bottom of this page.
HIGH RATE WATER PUMPS
Ball Valve
@ 45 Deg.
Bypass Pipe Size:
1.5" or 2" pipe @ 2 H.P.
2" pipe @ 3 +.H.P
2" p.v.c. "T"
2" p.v.c. "T"
All others must be set by flow meter.
See Commercial Plumbing Diagram
2 H.P Pumps
Close Bypass 50%
3 H.P. Pumps
Close Bypass 25%
BE SURE THE BYPASS VALVE IS
POSITIONED TO ALLOW REMOVAL
OF THE FRONT ACCESS PANEL!
Position the valve so that the access panel can be
easily removed, always check before final glu-
ing. Angle the valve out 45˚ to provide adequate
clearance. You may use a 2-way valve or other
type if desired. "Do not" use a brass gate valve
or a 3-way valve for bypass !
Exercise care when installing chemical feeders so as not to allow
back siphoning of chemicals into the heater, filters or pump.
CAUTION
CAUTION
Place plumbing so
access panel can
be opened
