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Section III.Installation12GAS PIPE SIZINGMODELNATPIPE SIZING FOR GAS LINE CONNECTIONSM AXIMUM EQUIVALENT PIPE LENGTH (Ft.)Natural Gas at 1000 B.T.U. per Cubic FootPropane Gas at 2500 B.T.U. per Cubic Foot“RESIDENTIAL” PROPANE GAS 2 STAGE REGULATIONIn many Propane gas line installations, the gas supplier and/or installer will utilize a two stage regulation processwhere by at the supply tank they will install the first stage gas regulator, which would be at a higher pressure, usually10 psi. This higher pressure allows for a much longer distance and in a much smaller pipe size. Then within a shortdistance of the pool heater, usually around 24 inches, they will install a second regulator, which is the second stage,and this would be set at the required inlet pressure of the heater.See “Gas Pressure Requirement Charts”Table 2.1 /2” 3 /4”1 ” 1 -1/4”1 -1/2”2 ” 2-1/2”PRONATPRONATPRONATPRONATPRONATPRO200- 20’30’80’125’250’450’600’- - - - - -250- 10’20’50’70’150’250’500’600’- - - - -300- - 10’30’50’100’200’350’400’600’- - - -400- - - 10’20’60’100’150’200’450’400’- - -NATPROStage One "High Pressure" Gas Pipe Sizing10 PSI @ 2500 B.T.U. Per CU. FT.MAXIMUM EQUIVALENT PIPELENGTHM odel 0 to 50 Ft.50to 100 Ft.100 to 150 Ft.200through 400 1 /2 in.1 /2 in.1/2 in.Stage Two "Low Pressure" Gas Pipe SizingStage 2 set at 14 in. W.C.MAXIMUM EQUIVALENT PIPE LENGTHM odel 0 to 10 Ft.10 to 20 Ft.200through 400 3 /4 in.3/4 in.Table 3. Table 4.“RESIDENTIAL” NATURAL GAS 2 STAGE REGULATIONIn many Natural gas line installations, the gas supplier and/or installer may utilize a two stage regulation processwhere by at the streets main gas supply they will install the first stage gas regulator, which would be at a higherpressure. This higher pressure is usually set at 2 psi or 5 psi and can be for long distances and in a much smaller pipesize. Then within a short distance of the pool heater, generally around 24 inches, they will install a second regulator,which is the second stage. This second stage regulator would be set at the minimum operating pressure for the heater.For “Natural Gas Pentair Pool Heaters” the minimum is 7 inches W.C.See “Gas Pressure Requirement Charts”Stage One "High Pressure" Gas Pipe Sizing2 PSI @ 1000 B.T.U. Per CU. FT.MAXIMUM EQUIVALENT PIPELENGTHM odel 0 to 50 Ft.50to 100 Ft.100 to 150 Ft.200through 300 1 /2 in.1 /2 in.1/2 in.4003 /4 in.3 /4 in.3/4 in.5 PSI @ 1000 B.T.U. Per CU. FT.200through 400 1 /2 in.1 /2 in.1/2 in.Stage Two "Low Pressure" Gas Pipe SizingStage 2 set at 7 in. W.C.MAXIMUM EQUIVALENT PIPE LENGTHM odel 0 to 10 Ft.10 to 20 Ft.200through 300 3 /4 in.3/4 in.4003 /4 in.1 in.Stage 2 set at 7 in. W.C.200through 400 3 /4 in.1 in.Table 5. Table 6.P/N 472235 Rev. D 12-22-04
Section III.Installation13TESTING GAS PRESSUREInletManifold1. Push the power switch to “OFF”.2. Turn the gas valve knob to “OFF”.3. Remove 1/8 in. NPT plug on the outletside of the valve and screw in theInletManifoldfitting from the Manometer kit.4. Connect the Manometer hose to thefitting.5. Turn the gas valve knob to “ON”.6. Turn on the heater and read theManometer.7. The Manometer must read per thevalues of the Gas PressureRequirement Table, on manifold sideof the gas valve, while operating.MiniMax NT TSIMiniMax NT STD8. If reading is below specified; check theIllustrations above are for Natural Gas, for Propane requirements, see Table 7.inlet pressure while the heater isrunning to make sure of proper supplybefore attempting adjustments.9. For adjustment, remove the Regulator Adjustment Cap and using a screwdriver turn the screw clockwiseto increase - counterclockwise to decrease gas pressure.CAUTIONThe use of Flexible Connectors (FLEX) is NOT recommended as they cause excessive high gas pressure drops.GAS PRESSURE REQUIREMENTSRegulator Adjustment CapGasPressureModelNaturalPropaneInches W.C.1/8" NPT Plug(Inlet Press)Maximum InletSTD1014TSI10N/ AMinimum InletS TD 5*12TSI4 N/ AFigure 4.OFFON1/8" NPT Plug(Manifold Press)ManifoldSTD4 11TSI2 N/ ANOTE:All readings must be taken while heater isoperating. Any adjustments or readings made whileheater is off will result in performance problems.All Values are +/- 0.2 inch W.C.* 6 inch. W.C. for STD 400 Model.Table 7.Rev. D 12-22-04 P/N 472235
Page 1 and 2: MiniMax ® NT SeriesPool & Spa Heat
Page 4 and 5: Section I. Heater Identification In
Page 6 and 7: Section II.Introduction6CODE REQUIR
Page 8 and 9: Section III.Installation8MANUAL BY-
Page 10 and 11: Section III.Installation10Reversibl
Page 14 and 15: Section III.Installation14INDOOR VE
Page 16 and 17: Section III.Installation16COMBUSTIO
Page 18 and 19: Section III.Installation18OUTDOOR I
Page 20 and 21: Section III.Installation20WIRING DI
Page 22: Section IV.Operation22SAFETY CONTRO
Page 25: Section IV.Operation25Figure 27.Rev
Page 28 and 29: Section V.TroubleshootingTroublesho
Page 30 and 31: Section VI.MaintenanceMaintenance I
Page 32 and 33: Section VI.MaintenanceCHEMICAL BALA
Page 34 and 35: 34P/N 472235 Rev. D 12-22-04
Page 36 and 37: 36REPLACEMENT PARTSNT TSI w/DDTC
Page 38 and 39: 38NOTESP/N 472235 Rev. D 12-22-04
Page 40: 40SAVE THESE INSTRUCTIONSPentair Wa

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