Install Above Pool Surface; Chlorinator/Chemical Feeder - Hayward H250FDN Service & Installation Manual


Figure 22: Typical plumbing to pool
INSTALLATION ABOVE POOL/SPA SURFACE:
If the heater is installed less than three (3) feet above the surface of the pool/spa water, install eyeball
fittings or directional flow fittings 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 filter 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 24 to prevent drainage of water in the heater during a filter change.
For installation below the
Figure 24: Heater installation
above pool/spa
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 eleva-
tion than the heater as shown in Figure 5. Install a separate
positive seal corrosion resistant check valve between the
heater outlet and the chlorinator to prevent highly concen-
trated sanitizers from backsiphoning
siphoning usually occurs when the pump is shut off and a
pressure differential is created.
pool/spa surface, refer to Section III.
into the heater. Back-
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
Figure 23: Multiple heater system
Figure 25: Automatic chlorinator
Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400 www.haywardpool.com