Jandy LJ Installation And Operation Manual

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Jandy LJ Installation And Operation Manual Manual pdf 16 page image

Model LJ Pool and Spa Heater Page 13from LP gas cylinders and filling equipment. Consultthe National Fuel Gas Code (NFPA 54 / ANSIZ223.1, latest edition), the Natural Gas InstallationCode in Canada (CAN/CSA-B149.1, latest edition),and any other local codes and fire protection authori-ties about specific installation restrictions in your area.SECTION 5.Water Connections5.1 Water PipingFigure 7 illustrates typical piping for pool equip-ment in pool/spa combination pools.For normal installations, do not install a shutoffvalve or any kind of variable restriction in the waterpiping between the heater outlet and the pool/spa. Inspecial installations where a shut-off valve, divertervalve or other variable restriction is required in theplumbing between the heater outlet and the pool, JandyPool Products, Inc. recommends the installation of apressure relief valve on the heater (see Section 5.6).Arrangement of pool system components otherthan as illustrated in these diagrams can affect theoperation of the heater’s water pressure switch.Location of the heater above or below the pool watersurface can also affect operation of the switch. Ingeneral, the pressure switch can be adjusted toaccommodate this effect if the heater water connec-tions are no more than six feet below the pool watersurface and no more than 15 feet above it. Seeinstructions for pressure switch adjustment (Section7.6) in the heater start-up section of this manual formore information about this.Note that when pool equipment is located belowthe pool surface a leak can result in large scale waterloss or flooding. Jandy Pool Products, Inc. cannot beresponsible for such water loss or flooding or thedamage caused by either occurrence.For special installations such as water connec-tions below the water level of the pool, or for otherquestions contact the Jandy Technical Service depart-ment at (707) 776-8200 ext 260.5.2 Check Valve InstallationThe heater must be protected from back-siphoning of water, which can result in dry starts. Ifthere is any chance of back-siphoning, provide a checkvalve between the pool and the filter pump inlet.When an automatic chemical feeder is installedin the plumbing, it must be installed downstream of theheater (see Section 5.7). A check valve must beinstalled between the heater and the chemical feederto prevent back-siphoning of chemically saturatedwater into the heater where it will damage the compo-nents.Figure 8. Heat exchanger reversal5.3 Automatic Flow Control ValveThe inlet/outlet header of the Lite2 comesequipped with an automatic flow control valve. Theautomatic flow control valve maintains the proper flowthrough the heater at rates up to approximately 125Gallons Per Minute (GPM) (475 liters per minute[LPM]). If the filter system flow rate is higher thanapproximately 125 GPM (475 LPM), install a manualbypass valve (see Figure 7), then perform a tempera-ture rise test (see Section 7.7) and adjust the flowusing the bypass valve until the proper temperaturerise is obtained.5.4 Reversible Water ConnectionsJandy Pool Products, Inc. ships the Lite2 heaterwith the water connections on the right side. The Lite2heater can be installed with the water connections oneither side. It could be necessary, or helpful, to switch