Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS Gas Piping, Gas Train and Controls

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Installation and Service Manual

2.Isolate the pool heater from the gas supply piping system by closing a manual shutoff valve during any piping system pressure testing that is equal to or less than 1/2 PSIG (3.5kPa).

3.Test all gas connections for gas leaks before placing the pool heater in operation.

Gas Piping

To safely operate this pool heater, you must properly size the gas supply piping. See Tables- J and K for piping and fitting requirements. Gas pipe size may be larger than pool heater connection.

On models 500,000 - 750,000 Btu/hr the gas connection to the pool heaters are 1 1/4" NPT and on models 990,000 - 2,070,000 Btu/hr the gas connections to the pool heaters are 2" NPT.

IMPORTANT: Do not block access to the electrical cover plate when installing the sediment trap. The sediment trap must be a minimum of 12 inches from the pool heater.

Optional gas controls may require routing of bleeds and vents to the atmosphere, outside the building when required by local codes.

Note: All secondary regulators MUST BE of the lock-up type and spaced a minimum of 6' from the appliance.

Connecting Gas Piping to the Pool Heater

All gas connections must be made with pipe joint compound resistant to the action of liquefied petroleum (L.P.) and natural gases. All piping must comply with local codes and ordinances. Piping installations must comply with approved standards and practices.

1.Make sure the gas line is a separate line direct from the meter unless the existing gas line is of sufficient capacity. Verify pipe size with your gas supplier.

2.Use new, properly threaded black iron pipe free from chips. If you use tubing, make sure the ends are cut square, deburred and clean. Make all tubing bends smooth and without deformation. Avoid flexible gas connections. Internal diameter of flexible lines may not provide the pool heater with the proper volume of gas.

3.For ease of service, install a union.

4.Install a manual main gas shutoff valve at the pool heater’s gas inlet, outside of the pool heater in accordance with the National Fuel Gas Code, ANSI Z223.1, this must be installed within 6 feet of the pool heater.

Figure 28 – Gas Line Connection

5.Run pipe or tubing to the pool heater’s gas inlet. If you use tubing, obtain a tube to pipe coupling to connect the tubing to the pool heater’s gas inlet.

6.Install a sediment trap in the supply line to the pool heater’s gas inlet (see Figure 28).

7.Apply a moderate amount of good quality pipe compound (do not use Teflon tape) to pipe only, leaving two end threads bare.

8.Remove the seal over the gas inlet to the pool heater.

9.Connect the gas pipe to the inlet of the pool heater. Use a wrench to support the gas manifold on the pool heater.

10.For L.P. gas, consult your L.P. gas supplier for expert installation.

11.Ensure that all air is completely bled from the gas line before starting the ignition sequence. Start up without properly bleeding air from the gas line may require multiple reset functions of the ignition control module to achieve proper ignition.

￿WARNING: Do not have any open flame in proximity to the gas line when bleeding air from the gas line. Gas may be present.

Gas Train and Controls

Note: The gas train and controls assembly provided on this pool heater have been tested under the applicable American National Standard to meet minimum safety and performance criteria such as safe lighting, combustion and safety shutdown 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 FansGeneral Information Venting SupportVertical Vent Termination Clearances and Location Table B Sidewall Vent Termination Clearances and LocationCombustion Air Inlet Piping Length of Air Inlet PipeSidewall Air Inlet Combined Air Inlet Points Vertical Rooftop Air InletVent System Options Conventional Negative Draft VentingNegative Draft Masonry Chimney Installations Flue Outlet PipingCommon Venting Systems Inspection of a Masonry Chimney Vertical DirectAire VentingVent Kits Sidewall VentingVenting of Flue Products Sidewall Fan Sidewall Venting TerminationSidewall Venting Without Fan Masonry Chimney Installation TABLE-E Horizontal DirectAire VentingDirect Venting Horizontal DV Venting Termination Flue Pipe MaterialsCombustion Air Inlet Piping Length of Air Inlet Pipe Air Inlet Piping MaterialsSealing Type-B Doublewall Vent Pipe or Galvanized Vent Pipe 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 TestConnecting Gas Piping to the Pool Heater Gas PipingGas Train and Controls 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 Water Flow Switch Relief ValveAutomatic Chlorinator and Chemical Feeders Pump Purge Delay Option Service Indicator OptionWay Automatic Bypass Valve Wiring TABLE-M Terminal Strip Connection OptionsLighting Instructions OperationPre-Start Checklist To Turn Off Gas To Pool HeaterStarting the Filter System 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 ModuleAccess to Internal Control Panel TABLE-NIgnition and Control Timings 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 AdjustmentAdjustment Procedure Servicing Hot Surface Igniter and Ignition ModuleIgnition System Checkout 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