Jandy LG125 Installation And Operation Manual

Jandy LG125 Installation And Operation Manual Manual pdf 14 page image

Page 12the "Natural Gas and Propane Installation Code"(CAN/CSA-B149.1), and any local codes and fireprotection authorities about specific installation restric-tions 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,Water Pik Technologies recommends the installationof a pressure relief valve on the heater (see Section5.6).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 (Section7.5) in the heater start-up section of this manual formore information about this.Note that when pool equipment is located belowNPT protective plug form the port and install theappropriate 1/8" NPT fitting to connect your manom-eter. The pressure will be zero when the heater is notrunning. When the heater is operating the manifold gaspressure should be 4.0" WC for natural gas heatersand 9.0" WC for LP gas heaters.To adjust the manifold gas pressure, first removethe slotted cap on the top of the gas valve to the rightof the control knob. Under the slotted cap is a slottedplastic screw which increases the manifold pressurewhen turned clockwise and decreases the manifoldpressure when turned counterclockwise.After measurements, and adjustments if neces-sary, have been made, make sure to replace the 1/8"NPT plug on the manifold pressure ports, and the capon the manifold pressure adjustment screw. It isextremely important to replace these parts beforeleaving the installation. Failure to do so can result indamage to property or injury or death.With the heater firing, the pressure must bewithin the range shown in Table 5. Also check thepressure with the heater off.4.3 Special Precautions for LP GasLP Gas is heavier than air and can thereforemore readily collect or “pool” in enclosed areas ifprovision for proper ventilation is not made. Installationof pool heaters in enclosed areas such as pits is notrecommended. However, if such an installation isrequired be sure to pay special attention to properventilation for LP gas. Locate heaters a safe distancefrom LP gas cylinders and filling equipment. In theUnited States, consult the "National Fuel Gas Code"(NFPA 54 / ANSI Z223.1, latest edition) or in Canada,Note: When using metal pipe as heat sink, join metal and PVC/CPVC, using metal male and PVC/CPVC female connection.Figure 7. Typical installation.