24
ONLY USE GENUINE HAYWARD REPLACEMENT PARTS
51300803801 REV B
The heater is equipped with CPVC flanged pipe nipples to accommodate water piping to and from the pool or spa. These pipe nipples will ac-
cept piping by solvent welding (PVC glue). The fittings will accept either a 2”pipe or a 2 1/2” pipe fitting and seal to the heater header with rub-
ber gaskets. The fittings are secured in place with supplied plastic union nuts. Assemble these parts to the heater prior to plumbing. Tighten
union nuts securely before gluing fittings to the ends of the pipe nipples (see Figure 13). The CPVC flanged pipe nipples must be installed on
the heater inlet and outlet without modification. Pipe, fittings, valves, and any other element of the filter system may be made of plastic materi-
als, if acceptable to the authority having jurisdiction. Heat sinks, heat tapes, firemen switches, and check valves are not required on the heater.
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 outlet pipe down stream of bypass system. The built-in bypass inside the header will maintain proper flow through the heat exchang-
er if the flow rate is within the range specified in the
GETTING STARTED
section. The minimum flow rate is to be calculated or measured with
the in-floor cleaning system in use, if the pool is so equipped, as well as any other jets or other demands on the water flow. If the normal pump
and filter system flow rate exceeds 125 gpm, then a manual bypass valve must be installed as shown in Figure 14. Damage caused by flow
rates outside this range will void the manufacturer’s warranty. Bypass valve setting may be accomplished by temporarily installing a flow meter
on the outlet line of the heater. Then adjust the manual bypass valve until the flowrate through the heater is within the flow rate range speci-
fied. Once the manual bypass valve is set, note the position and remove the valve handle to prevent accidental adjustment.
CAUTION:
Improperly adjusted manual bypass valves will result in damage to the heater if the flow rates are not maintained under all
operating conditions as specified in Table 1: Specifications. The heat exchanger will fail and this damage will not be covered under the
manufacturer warranty
.
Figure 15 illustrates a typical pool piping diagram and layout for the pool equipment. Figure 16 illustrates a multiple heater installation for very
large pools with and without a manual bypass valve.
Figure 15: Typical Plumbing to Pool or Spa
Figure 16: Multiple Heater System
