the filter system may be made of plastic
materials, if acceptable by the authority having
jurisdiction. If 1
1
⁄
2
” plastic pipe is used, it will slide
directly into the flanged pipe ends.
4. Heat sinks (heat tapes), firemen switches, and
check valves are not necessary on the H-Series
heaters. However, if there is any chance of “back-
siphoning” of hot water when the pump stops
running, it is suggested that a check valve be
used on the heater inlet pipe.
5. The vari-flo by-pass that is built into the front
header will maintain proper flow through the heat
exchanger if the flow rate is within the range for
the heater. See Figure 29.
6. If the normal pump and filter system flow rate
exceeds 125 gpm then a manual by-pass valve,
as shown in Figure 28, must be installed as
follows: Install a flow meter on the outlet line of
the heater. Adjust the manual by-pass valve until
the flow rate is within the rates required for the
heater. Once the valve is set, the position should
be noted and the valve handle removed to avoid
further adjustment.
7. Figure 30 shows a typical pool piping diagram
and layout for the pool equipment. Figure 31
shows multiple heater usage for very large pools
with and without an external by-pass (balancing)
valve.
NOTE:
Improperly adjusted by-pass valves may
result in damage to the heater; this damage is not
covered under warranty.
15
exception of a three-way switching valve and an
in-line chlorinator and associated check valve.
Blockage of water flow from heater return to pool
may result in fire or explosion causing property
damage, personal injury, or loss of life.
1. The H-Series heater is equipped with CPVC
SCH-80 flanged pipe nipples, union nuts, nitrile
O-rings for use with 2” pipe connections. Figure
27 shows the method for installing these parts on
the header.
NOTE:
Assemble these parts to heater prior to
plumbing. Tighten union nuts securely before gluing
fittings to ends of pipe nipples.
2. The CPVC SCH-80 flanged pipe nipples must be
installed on the heater inlet and outlet without
modification. CPVC SCH-80 plastic has an ASTM
rating of F441 and is NSF approved. The opposite
ends of the pipe nipples should be attached to the
filtration system as particular installation dictates.
3. Pipe, fittings, valves, and any other element of
14
Pipe Nipple Installation
Figure 27
Manual By-pass Valve
Figure 27
Typical Plumbing To Pool
Figure 30
Figure 29
Multiple Heater
Hookups
Figure 31
Model
Minimum
Maximum
H250IDL
25
125
H350IDL
40
125
H400IDL
40
125
