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Figure 13 illustrates a typical pool piping diagram and layout for the pool equipment.
Figure 14 illustrates a multiple heater installation for very large pools with and without a manual
bypass valve.
Figure 13: Typical plumbing to pool
INSTALLATION ABOVE POOL/SPA SURFACE:
If the heater is installed less than three (3) feet above the sur-
face of the pool/spa water, install eyeball fi ttings or directional fl ow
fi ttings on the end of the return water line to the pool/spa to create
adequate back pressure at the heater to operate the pressure safety
switch when the fi lter pump is running.
If the heater is installed more than three (3) feet above the surface
of the pool/spa water, install a loop as shown in Figure 15 to prevent
drainage of water in the heater during a fi lter change.
For installation below the pool/spa surface, refer to Section III.
AUTOMATIC CHLORINATORS AND
CHEMICAL FEEDERS:
If used, a chlorinator must be installed downstream from the
heater in the pool return line and at a lower elevation than the heater
as shown in Figure 16. Install a separate positive seal corrosion
resistant check valve between the heater outlet and the chlorinator
to prevent highly concentrated sanitizers from back-siphoning into
the heater. Back-siphoning usually occurs when the pump is shut off
and a pressure differential is created.
Figure 14: Multiple heater system
Figure 15: Heater installation
above pool/spa
Figure 16: Automatic chlorinator
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