Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS service manual Table K

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Installation and Service Manual

13.Remove the manometer and related fitting from the “inlet” side of the gas valve, replace 1/8" hex plug in the gas valve and tighten.

14.Turn on the gas supply at the manual valve, turn on L.P. gas at the tank if required.

15.Turn the power switch to the “ON” position.

16.Turn the gas valve knobs to the “ON” position.

17.Set the temperature control to call for heat.

WARNING: After completing any testing on

the gas system, leak test all gas connections. Apply a soap/water solution to all gas connections while main burners are operating. Bubbles forming indicate a leak. Repair all leaks at once. Do not operate this pool heater with a leak in the gas train, valves or related piping.

Check burner performance by cycling the system while you observe burner response. Burners should ignite promptly. Flame pattern should be stable, see Burner Flames, page 47. Turn system off and allow burners to cool, then cycle burners

again to ensure proper ignition and flame characteristics. Figure 30 – Measuring Gas Supply Pressure at

Combination Gas Valve

TABLE - K

Multiple Unit Installations Gas Supply Pipe Sizing

Nominal Iron					Length of Pipe In Straight Feet
Pipe Size,
(Inches)	10	20	30	40	50	60	70	80	90	100	125	150	175	200

3/4"	369	256	205	174	155	141	128	121	113	106	95	86	79	74

1"	697	477	384	328	292	267	246	256	210	200	179	164	149	138

1 1/4"	1,400	974	789	677	595	543	502	472	441	410	369	333	308	287

1 1/2"	2,150	1,500	1,210	1,020	923	830	769	707	666	636	564	513	472	441

2"	4,100	2,820	2,260	1,950	1,720	1,560	1,440	1,330	1,250	1,180	1,100	974	871	820

2-1/2"	6,460	4,460	3,610	3,100	2,720	2,460	2,310	2,100	2,000	1,900	1,700	1,540	1,400	1,300

3"	11,200	7,900	6,400	5,400	4,870	4,410	4,000	3,800	3,540	3,300	3,000	2,720	2,500	2,340

4"	23,500	16,100	13,100	11,100	10,000	9,000	8,300	7,690	7,380	6,870	6,150	5,640	5,130	4,720

Maximum capacity of pipe in thousands of BTU’s per hour for gas pressures of 14 Inches Water Column (0.5 PSIG) or less and a total system pressure drop of 0.5 Inch Water Column (Based on NAT GAS, 1025 BTU’s per Cubic Foot of Gas and 0.60 Specific Gravity).

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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 Venting3-Way Valve Cover Installation Combustion Air Fan Adjustment for startupGas Pressure Test Outdoor Vent Cap KitGas Train and Controls Connecting Gas Piping to the Pool HeaterGas Piping Venting of Combination Gas Valves Combination Gas ValvesChecking Gas Supply Pressure TABLE-JTable 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 ModeHot Surface Igniter and Ignition Control Module Diagnostic Status IndicationHot Surface Ignition Control Module Ignition Module Lockout FunctionsIgnition and Control Timings Access to Internal Control PanelTABLE-N TABLE-O Water ChemistryTest Recommended Level TABLE-PCirculating Pump Pipe Size RequirementsMinimum Pump Performance Heat ExchangerFlue Gas Passageways Cleaning Procedures High Water Temperature Limit ControlAppliance Area Water Circulating PumpHeat Exchanger Cleaning Burner Removal and CleaningElectrical Combustion and Ventilation AirFan Cleaning Adjusting Differential Air PressureCombustion Air Fan Adjustment Set-Up ProcedureIgnition 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