MiniMax® NT Series - H2Oco.com

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Section III.Installation8MANUAL BY-PASSPOOLHEATERMANUALBY-PASSTOPOOLFILTERPUMPWhere the flow rate exceeds the maximum 120 GPM,a manual bypass should be installed and adjusted. Afteradjustments are made, the valve handle should beremoved to avoid tampering. See Figure 2.CHECKVALVEGATEVALVEM odel M in. (GPM)Max. (GPM) *Figure 2.FROMPOOLPLUMBING CONNECTIONSCHECKVALVEThe MiniMax NT heater has the unique capability of directschedule 40 PVC plumbing connections. A set of bulkheadfittings is included with the MiniMax NT to insureconformity with Pentair’s recommended PVC plumbingprocedure. Other plumbing connections can be used. SeeFigure 2 for plumbing connections.CAUTIONBefore operating the heater on a new installation, turnon the circulation pump and bleed all the air fromthe filter using the air relief valve on top of the filter.Water should flow freely through the heater. Do notoperate the heater unless water in the pool/spa is atthe proper level. If a manual by-pass is installed,temporarily close it to insure that all air is purgedfrom the heater.VALVESWhen any equipment is located below the surface of thepool or spa, valves should be placed in the circulation pipingsystem to isolate the equipment from the pool or spa. Checkvalves are recommended to prevent back siphoning.CAUTIONExercise care when installing chemical feeders soas to not allow back siphoning of chemical into theheater, filters or pump. When chemical feeders areinstalled in the circulation of the piping system,make sure the feeder outlet line is down stream ofthe heater, and is equipped with a positive sealnoncorrosive “Check Valve”, (P/N R172288),between the feeder and heater.20020120250301203003012040040120* Do not exceed the maximum recommendedflow rate for the connecting piping.See page 30 forPressure Relief Valve Installations.BELOW POOL INSTALLATIONTable 1.If the heater is below water level, the pressureswitch must be adjusted. This adjustment must bedone by a qualified service technician.See following CAUTION before installation.CAUTIONBELOW OR ABOVE POOL INSTALLATIONThe water pressure switch is set in the factory at1½ PSI. This setting is for a heater installed at pool levelor within 3’ above or 3’ below. If the heater is to be installedmore that 3’ above or 3’ below, the water pressure switchmust be adjusted by a qualified service technician. Seepage 22, Figure 22.FLOW SWITCHIf the heater is installed more the 6’ above the pool ormore than 10’ below the pool level, you will be beyondthe limits of the pressure switch and a flow switch mustbe installed. Locate and install the flow switch externallyon the outlet piping from the heater, as close as possibleto the heater. Connect the flow switch wires in place ofthe water pressure switch wires.P/N 472235 Rev. D 12-22-04
Section III.Installation9WATER CONNECTIONSReversing Headers —Reversible Inlet/Outlet ConnectionThe MiniMax NT Series heater is factory assembledwith right side inlet/outlet water connections. Theinlet/outlet header can be reversed for left side waterconnections without removing the heat exchanger.Reversing Water ConnectionsTools required:Phillips Screw Driver9/16 in. Socket and Wrench1/2 in. & 9/16 in. Open Wrench1. Remove the right and left large access doors. It isnot necessary to remove the top of the heater togain access to the headers.NOTEDo NOT remove the high-limit and pressureswitches or the thermistor from the front headerduring the reversing procedure, as they will be inthe proper location when installed on the left side.3. Disconnect the water pressure switch wiring.4. Disconnect the temperature sensor wires fromthe circuit board and feed them back to theheader.2. Disconnect all wires from the high-limitswitches except the short jumper wire.5. Remove the 8 bolts holding the main inlet/outlethead.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 10 and 11: Section III.Installation10Reversibl
Page 12 and 13: Section III.Installation12GAS PIPE
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

MiniMax® NT Series - H2Oco.com

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