Hayward Universal H-Series Service/Installation: H150FDN H200FDN H250FDN H300F - Page 25

25 ATTENTION: Whenever a high-pressure double regulation system is utilized for propane gas, consult a propane expert for accurate pipe and pressure sizing. Make sure that 1st and 2nd stage regulators are large enough to handle the BTUH input listed for the heater(s) being used. Hayward will not be responsible for heaters that soot up due to improper gas line or propane tank sizing resulting in improper gas volume. WATER PIPING: The heater is designed for use with pool and spa/hot tub water only, as furnished by municipal water dis- tribution systems. The warranty does not cover heater use with mineral water, seawater (PPM>4000), or other non-potable waters. Do not install any restriction in the water pipe between the heater outlet and the pool/spa with the exception of: 1. three-way switching valve Figure 15: Pipe nipples 2. in-line chlorinator 3. chlorinator check valve WARNING: EXPLOSION HAZARD Blockage of water flow from heater return to pool may result in fire or explosion causing property damage, personal injury, or loss of life. Heater Header Gaskets Fittings Plastic Header Union Nuts The heater is equipped with CPVC flanged pipe nipples to accomodate water piping to and from the pool or spa. These pipe nipples will accept 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 rubber gaskets. On plastic headers, the fit- tings are secured in place with plastic union nuts, and on bronze headers (ASME models), the fittings are secured Heater Header Gaskets Fittings Bolts in place with bolts. Assemble these parts to the heater Bronze Header (ASME) prior to plumbing. Tighten union nuts (or bolts) securely before gluing fittings to the ends of the pipe nipples. See Figure 15. 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 materials, 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 inlet pipe. The built-in bypass inside the header will maintain proper flow through the heat exchanger if the flow rate is within the range for the heater. See Table 14. The minimum flow rate is to be calculated or measured with the infloor cleaning system in use, if the pool is so equipped, as well as any other jets or other demands on the water flow. USE ONLY HAYWARD GENUINE REPLACEMENT PARTS Pomona, CA Clemmons, NC Nashville, TN Tel: 908-351-5400 www.haywardpool.com