Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS service manual Length of Air Inlet Pipe

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Installation and Service Manual

In cold climates, use a Type-B doublewall vent pipe or an insulated single wall pipe for combustion air. This will help prevent moisture in the cool incoming air from condensing and leaking from the inlet pipe.

￿CAUTION: Pool heaters that are shut down or will not operate may experience freezing due to convective airflow in the air inlet pipe.

Length of Air Inlet Pipe

The installed length of air inlet pipe from the pool heater to the outside air inlet cap must not exceed 50 equivalent feet (15.2m). Subtract 5 feet (1.5m) of equivalent length for each 90° elbow. Subtract 2.5 feet (0.7m) of equivalent length for each 45° elbow.

Do not exceed the limits for the combustion air inlet piping lengths.

Connecting the Air Inlet Pipe to the Pool Heater Connect the air inlet piping directly to the pool heater by attaching it to the DV box adapter. The DV box adapter is included in the direct vent kits for horizontal direct vent. For vertical direct vent, order the DVK3003 kit from the pool heater manufacturer. The combustion air inlet area of the pool heater is located at the right rear corner of the pool heater. This pool heater uses a simple air filter to ensure clean air is used for the combustion process. Attach the DV box adapter over the air filter (see Figure 24). Align the screw holes on the DV box adapter with the screw holes surrounding the air filter hanger. Insert the sheet metal screws and tighten firmly.

Figure 24 – Attaching DV Box Adapter to Unit

For venting versatility, you can move the air filter assembly and DV box adapter to the right side of the pool heater. Remove the metal panel on the pool heater’s right side (see Figure 25). Remove the filter/bracket assembly from the rear of the pool heater.

Note: Modifications to the DV box adapter will be necessary to allow installation on the right side of the pool heater. Follow the instructions shipped with the vent kit.

Attach the filter/bracket assembly and DV box adapter to the right side opening using the pre-drilled screw holes. Make sure you attach the metal panel to the rear combustion air opening of the pool heater.

The DV box adapter has an air inlet pipe mounting ring. Connect combustion air inlet piping to the direct vent box mounting ring.

Figure 25 – Moving Air Filter Assembly and DV Box Adapter

Air Inlet Piping Materials

The air inlet pipe(s) must be sealed. Select the air inlet pipe material from the following specified materials.

PVC, CPVC, or ABS (6", 7", or 8" I.D.)

Galvanized steel vent pipe with joints and seams sealed as specified below.

Type-B doublewall vent with joints and seams sealed as specified below.

Check local codes for possible restrictions.

￿WARNING: Use only vent or air intake materials specified in this manual. Follow vent pipe manufacturer’s instructions. Failure to do so can result in property damage, personal injury, or death. Mixing of venting materials will void the warranty and certification of this pool heater.

Sealing Type-B Doublewall Vent Pipe or Galvanized Vent Pipe

Follow the steps below to properly seal Type-B doublewall vent pipe or galvanized vent pipe.

1.Seal all joints and seams of the air inlet pipe using either aluminum foil duct tape meeting UL Standard 723 or 181 A-P or a high quality UL Listed silicon sealant such as those manufactured by Dow Corning or General Electric.

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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