Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS Relief Valve, Water Flow Switch

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Installation and Service Manual

Relief Valve

Figure 38 - Multi-Stack Frame - Heaters are Beyond 15 feet from Pool Piping

This pool heater is supplied with a relief valve(s) sized in accordance with ASME Boiler and Pressure Vessel Code, Section IV. The relief valve(s) is installed in the vertical position and mounted in the hot water outlet. Place no other valve between the relief valve and the pool heater. To prevent water damage, pipe the discharge from the relief valve to a suitable floor drain for disposal when relief occurs. Do not install any reducing couplings or other restrictions in the discharge line. The discharge line will allow complete drainage of the valve and line. Manually operate the relief valves at least once a year.

￿CAUTION: Avoid contact with hot discharge water.

Automatic Chlorinator and Chemical Feeders

All chemicals must be diluted into the pool water being circulated through the pool heater. Any concentration of chlorine in the pool heater can cause damage to the pool heater.

Do not place chlorine tablets or bromine sticks in the skimmer. High chemical concentrations will result when the pump is not running.

Chlorinator must feed downstream of the pool heater and have an anti-siphoning device to prevent chemical back-up in the pool heater when the pump is shut off.

Water Flow Switch

IMPORTANT: High chemical concentrations from improperly adjusted feeders and Chlorinator can cause rapid corrosion to the heat exchanger. This damage is non-warrantable.

A water flow switch is standard equipment. The wiring connection installs the flow switch in the 24 VAC safety circuit to prove water flow before main burner ignition. The standard flow switch is installed in the outlet side of the piping loop when shipped from the factory. These pool heaters require a sufficient flow of 26 GPM to make the flow switch and start burner operation.

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Contents GAS Heaters for Commercial Pool Applications Commercial Pool Heaters Unpacking General Product InformationCommercial Pool Heaters Product Identification Base for Combustible Floors Clearances from Combustible ConstructionCombustion Air Filter Freeze ProtectionCombustion Air Options InstallationCombustion Air from Interior Space Exhaust FansVertical Vent Termination Clearances and Location General InformationVenting Support Table B Sidewall Vent Termination Clearances and LocationSidewall Air Inlet Combustion Air Inlet PipingLength of Air Inlet Pipe Combined Air Inlet Points Vertical Rooftop Air InletNegative Draft Vent System OptionsConventional Negative Draft Venting Common Venting Systems Masonry Chimney InstallationsFlue Outlet Piping Inspection of a Masonry Chimney Vertical DirectAire VentingVenting of Flue Products Vent KitsSidewall Venting Sidewall Venting Without Fan Sidewall FanSidewall Venting Termination Masonry Chimney Installation TABLE-E Horizontal DirectAire VentingDirect Venting Combustion Air Inlet Piping Horizontal DV Venting TerminationFlue Pipe Materials Sealing Type-B Doublewall Vent Pipe or Galvanized Vent Pipe Length of Air Inlet PipeAir Inlet Piping Materials Vertical Rooftop Air Inlet Combined Combustion Air Inlet PointsOutdoor Vent/Air Inlet Location Outdoor Installation VentingOutdoor Vent Cap Kit Combustion Air Fan Adjustment for startup3-Way Valve Cover Installation Gas Pressure TestGas Train and Controls Connecting Gas Piping to the Pool HeaterGas Piping TABLE-J Combination Gas ValvesVenting of Combination Gas Valves Checking Gas Supply PressureTable K Multiple Unit Installations Gas Supply Pipe SizingMeasuring Net Manifold Gas Pressure Gas Manifold Pressure AdjustmentPumped Automatic Bypass Auxiliary Mixed Water Limit ControlWay Valve Cover Heater is Within 15 Feet of Pool Piping Heaters are within 15 feet Perpendicular of Pool Piping Automatic Chlorinator and Chemical Feeders Water Flow SwitchRelief Valve Way Automatic Bypass Valve Wiring Pump Purge Delay OptionService Indicator Option TABLE-M Terminal Strip Connection OptionsLighting Instructions OperationStarting the Filter System Pre-Start ChecklistTo Turn Off Gas To Pool Heater Operation Error Messages Displayed by the Temperature Controller Programming ModeIgnition Module Lockout Functions Diagnostic Status IndicationHot Surface Igniter and Ignition Control Module Hot Surface Ignition Control ModuleIgnition and Control Timings Access to Internal Control PanelTABLE-N TABLE-O Water ChemistryTest Recommended Level TABLE-PHeat Exchanger Pipe Size RequirementsCirculating Pump Minimum Pump PerformanceWater Circulating Pump High Water Temperature Limit ControlFlue Gas Passageways Cleaning Procedures Appliance AreaCombustion and Ventilation Air Burner Removal and CleaningHeat Exchanger Cleaning ElectricalSet-Up Procedure Adjusting Differential Air PressureFan Cleaning Combustion Air Fan AdjustmentIgnition System Checkout Adjustment ProcedureServicing Hot Surface Igniter and Ignition Module Sequence of Operation Glossary Prepurge Wiring BOX Connections Wiring BOX Connections Ladder Diagram Control BOX Connections Commercial Pool Heaters Appendix a View Menu Item Menu Description Appendix B