Plumbing Connections - Hayward H150 Installation, Operation And Service Manual

Plumbing connections:

1. The H-Series heater is equipped with CPVC SCH-80
flanged pipe nipples, union nuts, neoprene O-rings
for use with 2" pipe connections. Figure 22 shows the
method for installing these parts on the front header.
!
NOTE: Assemble these parts to heater prior to plumb-
ing. 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 modifica-
tion. 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 the filter
system may be made of plastic materials, if acceptable
by the authority having jurisdiction. 1 1/2" plastic pipe if
used, will slide directly into the flanged pipe ends.
4. Heat sinks (heat traps), fireman 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 23.
RECOMMENDED FLOW RATE IN GPM
Model Minimum
H150-H400
Figure 23
6. If the normal pump and filter system flow rate exceeds
125 gpm then a manual by-pass valve, as shown in
Figure 24, 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 re-
quired for the heater. Once the valve is set, the position
should be noted and the valve handle removed to avoid
further adjustment.
7. Figure 25 shows a typical pool piping diagram and lay-
out for pool equipment. Figure 26 shows multiple heater
usage for very large pools with and without an external
by-pass (balancing) valve.
Maximum
25 125
SECTION 3. INSTALLATION
CONNECTION
TO HEATER
INTLET
FROM PUMP
AND FILTER
Figure 24: Manual By-pass Valve
TO POOL
MAIN
DRAIN
POOL
FROM
POOL
Figure 25: Typical Plumbing To Pool
THERMOMETER
FROM FILTER
THERMOMETER
FROM FILTER
BALANCING VALVE
Figure 26: Multiple Heater Hookups
CONNECTION
TO HEATER
OUTLET
FLOW METER
RETURN TO
POOL/SPA
VALVE
3-WAY VALVE
RELIEF
VALVE
OPTION
SPA
HEATER
(if necessary)
FILTER
BALANCING VALVES
3-WAY
FOR SKIMMER
VALVE
AND DRAIN
THERMOMETER
2"
TO POOL
2"
THERMOMETER
2"
ADJUST
BALANCING VALVE
TO OBTAIN A
20ºF DIFFERENTIAL
2"
ACROSS
THERMOMETERS
TO POOL
MANUAL
BY-PASS
VALVE
PUMP
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