Pentair MiniMax 250 User's Manual
Contents
1. OUTDOOR VENTILATION 15 50 2in SOCKET 30 63 J Sedo MODEL A DIM 200 21 63 250 24 63 300 27 63 Figure 2 400 34 13 LEG INDOOR VENTILATION INDOOR VENT ADAPTOR PIN 460506 4in Kit PIN 460507 5 Kit 2 00 ot P N 460506 TIN Sin Kit 2 P N 460507 Ss 30 63 e e I p Nee om MODEL A DIM 14 50 200 21 63 SOSA PAE 250 24 63 a T Y 300 27 63 Figure 3 LEG 6 64 4 4 875 20 Sak A DIM P N 471593 Rev 11 1 01 Installation Electrical 7 ELECTRICAL ALL HSI UNITS Electrical Rating 50 60 Hz 120 V A C ONLY NOTE The transformer is pre wired at the factory for 120 VAC operation connect line supply to the line terminal block inside junction box Use caution in con necting supply to proper Line L Neutral N and Ground GND terminals see below Figure 5 NOTE If any of the original wiring supplied with this heater must be replaced installer must supply No 18 AWG 105 C U L approved AWM low energy stranded copper wire or it s equivalent In Canada wires must be CSA approved The heater must be electrically grounded and bonded in accordance with local codes or in the absence of local codes with the latest national electrical codes ANSI NFPA No 70 In Canada CSA standard C22 1 Canada Electrical Code Part 1 and or local codes Always use crimp type connectors when conn2. e EE cree Ene Dese ene Eee Back Cover P N 471593 Rev 11 1 01 Introduction MiniMax NT Low NOx Pool and Spa Heaters Congratulations on your purchase of a MiniMax NT Low NOx high performance heating system Proper installation and service of your new heating system and correct chemical maintenance of the water will ensure years of enjoyment The MiniMax NT Low NOx is a compact lightweight efficient induced draft gas fired high performance pool and spa heater that can be directly connected to schedule 40 PVC pipe The MiniMax NT Low NOx also comes equipped with the Pentair multifunction temperature controller 7800 which shows at a glance the proper functioning of the heater All HSI hot surface ignition MiniMax NT Low NOx heaters are designed with a direct ignition device HSI which eliminates the need for a standing pilot The MiniMax NT Low NOx requires an external power source 120 240 VAC 50 60 Hz to operate IMPORTANT NOTICES For the installer and operator of the MiniMax NT Low NOx pool and spa heater The manufacturer s warranty may be void if for any reason the heater is improperly installed and or operated Be sure to follow the instructions set forth in this manual If you need any more information or if you have any questions regarding to this pool heater please contact Pentair Pool Products Inc at 800 831 7133 These heaters are designed for the heating of swimming pools and spa
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4. esn snu epoo e20 Aq se 10 eui unoJuj sessed 1i uoiuM ye jurod y uey s23 je snu Suollellelsul JOO 10 ju9A Jl OF j9efqo Aue 9A OQ 1SE89 je pejeuiuuJoe JUBA Rev C 11 1 01 P N 471593 Installation Outdoor 19 VENTILATION OUTDOOR INSTALLATION ONLY Outdoor Shelter Installation in Canada see page 16 For outdoor installation with built in vent the heater must be placed in a suitable area on a level noncombustible surface Do not install the heater under an overhang with clearances less than 3 feet from the top of the heater The area under an overhang must be open on three sides Maintain minimum clearances as indicated below Install a minimum of 4 feet below and 4 feet horizontally from any opening to a building see Figure 17 IMPORTANT When locating the heater consider that high winds can roll over or deflect off adjacent buildings and walls Normally placing the heater at least three feet from any wall will minimize downdraft NOTE This unit shall not be operated outdoors at temperatures below 20 F for natural gas OUTDOOR INSTALLATION MINIMAX NT VENTING GUIDELINES E Check local building codes for setback requirements Figure 17 Vent Termination Must be not less than 7 ft above public walkways A Must be at least 3 ft above any forced air inlet l
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6. When call for heat is received from the thermostat supplying 24 VAC to the W module terminal the control will perform a self check routine flash the diagnostic LED on units manufactured prior to 10 15 01 located on the module for up to four seconds and begins the safety timing ignition sequence After the fan prepurge cycle the hot surface ignitor is activated for a heat up period followed by energization of the gas valve for the trial for ignition period When flame is detected during the trial for ignition the ignitor is deactivated and the gas valve remains energized The thermostat and main burner flame are constantly monitored to assure the system continues to operate properly When the thermostat is satisfied and the demand for heat ends the main valve is de energized immediately FAILURE TO LIGHT LOCK OUT Should the main burner fail to light or flame is not detected during the trial for ignition period the control will go into lockout and the gas valve will be turned off immediately The thermostat controller will display a flame failure error icon service LED and recovery from lockout requires a manual reset by either resetting the 7800 Thermostat or removing 24 VAC from the system by turning off main power switch located on the junction box behind right door for a period of 5 seconds FLAME FAILURE RE IGNITION If the established flame signal is lost while the burner is operating the control will respond wit
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8. Insufficient water flow Turn switch to ON Heater Short Cycling Rapid On and Off Operation Clean filter and pump strainer Defective wiring Repair or replace wiring Defective flow valve or out of adjustment Call serviceperson Defective hi limit and or thermostat Call serviceperson Heater Makes Knocking Noises Make sure all valves on system are open Heater operating after pump has shut off Shut off gas supply and call serviceperson Heater exchanger scaled Shut off gas supply and call serviceperson Please consult the latest edition of the MiniMax NT Low NOx Service Manual for complete service and repair instructions Repairs should only be attempted by properly trained service personnel P N 471593 Rev 11 1 01 33 MINIMAX NT LOW NOx HEATER Single Voltage MiniMAX NT Low NOx Single Voltage rii GG g GGG X ZS o o QGP K 4 A us gt p Rev 11 1 01 471593 34 MiniMax NT Low NOx Single Voltage Replacement parts ITEM DESCRIPTION Shut off Safety Switch Exhaust Gasket Blower sd lue Collector Assy et Manifold Ass ol at hange T m 9o O a U 2 4 lt 471592 471701 471692 471591 471995 471996 471714 471741 471610 472007 472005 471991 471622 072184 471835 471821 471785 471838 471641 471640 471566 471587 471694 471672 471992 274440 471441 070951 471750 471506
9. Equiv ft Additional 90 elbows Additional 45 elbows Additional 90 elbows Additional 45 elbows after first elbow after first elbow after first elbow after first elbow Quantity Reduced Max Quantity Reduced Max Wm Rev 11 1 01 P N 471593 Installation Indoor INDOOR INSTALLATION USA ONLY OUTDOOR SHELTER INSTALLATION CANADA See page 17 for Indoor Vent Adaptors products of combustion and vent gases must be completely removed to the outside atmosphere through a vent pipe which is connected to the stack adaptor A vent pipe extension of the same size must be connected to the indoor stack adaptor and extended at least 2 feet higher than highest point of the roof within a 10 foot horizontal radius and at least 3 ft higher than the point at which it passes through the roof or as permitted by local code see Figures 11 and 12 The vent should terminate with an approved vent cap weather cap for protection against rain or blockage by snow Double wall vent pipe and an approved roof jack shall be employed through the roof penetration The heater must be located as close as practical to a chimney or gas vent ACAUTION The heater should be installed at least 5 feet away from the pool or spa The heater must be placed in a suitable room on a non combustible floor or on a non combustible base and in an area where leakage from heat exchanger or water connections will not result in damage to
10. NORMAL operation pressing the MODE key allows you the cycle between the right hand display showing the SET TEMP for the currently active POOL or SPA or the TIME Pentair Temperature Controller 7800 Layout FLASH IN PROGRAM MODE DAY ICON ALTERNATE DISPLAY C or F DISPLAY IN TIME MODE ONLY FAHRENHEIT ALTERNATE DISPLAY C CELSIUS P ooooooo BLANK A M SYSTEM PowER V I NORMAL AN SERVICE 0 F CURRENT TEMP SET TEMP TIME POOL OR SPA SPALPOOL DISPLAY ALTERNATELY ON LCD TO SHOW ACTIVE SELECTION P v7 Pres IGN H LMT PRESS FAN AUX TFUSE FAULT CONDITION LCD ICONS SET e POOL OFF SPA T Temp PROGRAM STEP 9 H KEYPAD SWITCHES Figure 21 Rev 11 1 01 471593 Temperature amp Time Setting Programming 24 TO CHANGE THE FACTORY TEMPERATURE SETTINGS 1 Before changing the temperature make sure the Temperature is in the right window see pages 24 and 25 if Time is displayed press the MODE key to change to the Temperature Mode SET e 2 To change the Pool Temperature setting press the POOL key POOL OFF BOO 3 To Raise or Lower the Pool Temperature
11. area for gas Be sure to smell next attempted repair may result in a fire or explosion to the floor because some gas is heavier than D Do not use this heater if any part has been under air and will settle on the floor water Immediately call a qualified service WHAT TO DO IF YOU SMELL GAS technician to inspect the heater and to replace Do not try to light any heater any part of the control system and any gas Do not touch any electrical switch do not use control which has been under water any phone in your building E The MiniMax NT Low NOx incorporates the Pentair temperature controller 7800 to aid you in the operation of the heater and to assist in diagnosing a failure in the heater s function Immediately call your gas supplier from a neighbor s phone Follow the gas supplier s instructions Ifyou cannot reach your gas supplier call the Fire Department es OPERATING INSTRUCTIONS M 1 STOP Read the safety information above 9 Replace the control access door 2 Set the thermostat to the lowest setting 10 Turn on the electrical power to the heater 3 Turn off electric power to the heater 11 Set the thermostat to the desired setting 4 This heater is equipped with an ignition device 12 Ifthe heater will not operate follow the instruc which automatically lights main burners Do tions To Turn Off Gas To Heater and call your not try to light the burners by hand service technician or gas supplier 5 Remove the
12. bacteria algae and other oxidiz able materials The disinfectant remaining is called chlorine residual or bromine residual You can determine the disinfectant residual of your pool water with a reliable test kit available from your local pool supply store You must maintain a disinfectant residual level adequate enough to assure a continuous kill of bacteria or virus introduced into pool water by swimmers through the air from dust rain or other sources Itis wise to test pool water regularly Never allow chlorine residual to drop below 0 6 ppm parts per million The minimum level for effective chlorine or bromine residual is 1 4 ppm pH The term pH refers to the acid alkaline balance of water expressed on a numerical scale from 0 to 14 A test kit for measuring pH balance of your pool water is available from your local pool supply store see Table 3 pH Chart Neutral Table 3 Strongly Acid 01 2 34 5 6 Strongly Alkaline 7 8 9 10 11 12 13 14 Muriatic Acid has a pH of about 0 Pure water is 7 neutral Weak Lye solution have a pH of 13 14 Rev 11 1 01 27 RULE 7 4 to 7 6 15 desirable pH range It is essential to maintain correct pH see Table 4 If pH becomes too high over alkaline it has these effects 1 Greatly lowers the ability of chlorine to destroy bacteria and algae 2 Water becomes cloudy There is more danger of scale formation on the plaster or in the heat exchanger 4 Filter element
13. done by opening the drain valve located at the inlet outlet header see Figure 23 allowing all water to drain out of the heater It would be a good practice to use compressed air to blow the water out of the heat exchanger See additional notes under Important Notices in Introduction Rev 11 1 01 Maintenance Water Treatment CHEMICAL BALANCE POOL AND SPA WATER Your Pentair Pool Products pool heater was designed specifically for your spa or pool and will give you many years of trouble free service provided you keep your water chemistry in proper condition Three major items that can cause problems with your pool heater are improper pH disinfectant residual and total alkalinity These items if not kept properly balanced can shorten the life of the heater and cause permanent damage A CAUTION Heat exchanger damage resulting from chemical imbalance is not covered by the warranty WHAT A DISINFECTANT DOES Two pool guests you do not want are algae and bacteria To get rid of them and make pool water sanitary for swimming as well as to improve the water s taste odor and clarity some sort of disinfectant must be used Chlorine and bromine are universally approved by health authorities and are accepted disinfecting agents for bacteria control WHAT IS A DISINFECTANT RESIDUAL When you add chlorine or bromine to the pool water a portion of the disinfectant will be consumed in the process of destroying
14. or fan pressure switches which all appear as air gas pressure faults illuminating blower fan fault icon and RED service required LED P N 471593 Rev 11 1 01 Troubleshooting Normal Operation of Heater 29 3 After normal firing of the heater main burners the heater will continue to operate until the temperature setpoint is reached thermostat satisfied As the pool spa loses heat the heater will refire and continue to operate cycling automatically to maintain the selected temperature setpoint for either the pool or spa If at anytime during the firing of the heater an unsafe condition is detected the heater will stop firing and an automatic safe shutdown sequence will begin Investigate and have corrected the cause of the abnormal firing termination before placing heater back in operation Please Note During the firing of the heater you decide to change to the pool or spa selection by depressing the selector key for POOL or SPA the heater will first acknowledge the new selection by flashing the new selection s corresponding selection LED POOL or SPA however the heater will first complete a safe shutdown sequence before automatically switching to the new selected setting and safely initiating a new firing sequence using the the new temperature setpoint During this automatic crossover sequence the keyboard on the Pentair Temperature Controller 7800 will not accept any further keying until the cycle complete
15. problems should obtain their physician s advice before using spas or hot tubs 6 Persons taking medication which induce drowsiness such as tranquilizers antihistamines or anticoagulants should not use spas or hot tubs AWARNING Should overheating occur or the gas supply fail to shut off turn off the manual gas control valve to the appliance Do not use this heater if any part has been under water Immediately call a qualified service technician to inspect the heater and to replace any part of control system and gas control which has been under water P N 471593 Rev C 11 1 01 Operation Lighting 5 MINIMAX NT LOW NOx HSI ELECTRONIC IGNITION LIGHTING OPERATION NATURAL GAS ENS FOR YOUR SAFETY READ BEFORE LIGHTING i If you do not follow these instructions exactly a fire or explosion may result causing personal injury loss of life and property damage Do not attempt to light the heater if you suspect a natural gas leak Lighting the heater can result in a fire or explosion which can cause personal injury death and property damage A This heater is equipped with an ignition device C Use only your hand to push in or turn the gas which automatically lights the main burners control knob Never use tools If the knob will Do not try to light the burners by hand not push in or turn by hand don t try to repair it B BEFORE OPERATING smell all around Call a qualified service technician Forced or the heater
16. slightly and turn the knob clockwise to OFF See page 5 Natural Gas Instructions 6 Wait 5 minutes to clear out any gas If you then smell gas STOP Follow the safety information stated earlier in the lighting instructions section If you don t smell gas go to the next step See page 5 Natural Gas Instructions 7 Turn the knob on the gas control counter clockwise to the ON position See page 5 Natural Gas Instructions 8 Replace the doors 9 Push either the Pool or Spa key to start the heater NOTE Pool key is Factory set at 78 and Spa key is set at 104 10 Setthe thermostat if needed by using the up down arrows to set the desired temperature a Fan motor starts which closes draft proving switch b Ignition module is energized after fan prepurge cycle is completed approximately 2 minutes c Check for powering up the glow coil hot surface ignitor by viewing through the sight glass 11 The ignitor will warm up and then gas valve opens to ignite the main burners 12 Heater will operate until desired temperature is reached P N 471593 Rev 11 1 01 Basic Operation SAFETY CONTROLS AIR PRESSURE FAN SWITCH The air pressure switch is a safety device used to insure that the blower fan is operating and has been designed to monitor the vacuum negative pressure within the blower housing The air pressures switch is factory set and is in the ignition module circuit the ignition m
17. the area adjacent to the heater or the structure When such locations cannot be avoided it is recommended that a suitable drain pan with adequate drainage be installed under the heater The pan must not restrict air flow Installations in basements garages or underground structures where flammable liquids may be stored must have the heater elevated 18 inches from the floor using a non combustible base The following minimum clearances from combustible materials must be provided Side Front Back Top Water Connection 18 in 24 in Remaining 6 6 in Ceiling Clearance 18 in To ceiling or roof P N 471593 Figure 11 VENT CAP AND RISER FURNISHED BY INSTALLER AIR SUPPLY VENTILATION E A AIR SUPPLY GAS COMBUSTION OPTIONAL SIDE WALL VENT NT Figure 12 The heater should not be installed closer than 6 inches to any fences walls or shrubs at any side or back nor closer than 18 inches at the plumbing side A minimum clearance of 24 inches must be maintained at the front of the heater Figure 13 Rev C 11 1 01 Installation Indoor NOTE The heater requires two uninterrupted air supply openings one for ventilation and one to supply oxygen for proper gas combustion The air supply openings should be sized according to Table 2 Air supply requirements be
18. 003 472002 472001 31 Plate do 1 f 471871 471819 471873 471977 41 O 32 Jacket Upper Panel Left 1 471575 33 Jacket Corner BT 34 JacetDivder 1 4718271471651 471826 471580 35 Jacket Lower Panel Left 1 471647 36 Base 471829 471645 471828 471573 37 JacketBack 1 1 1 471861 471669 471874 471574 38 Bracket JacetSid e 1 2 3 471768 39 Jacket Upper Panel Right 1 J 456 40 Jacket Upper Subplate Rigt 2 ET 41 Jacket LowerPanel Right 1 1 471577 42 BaseHeatShield 1 1 471831 471646 471830 471579 43 ControlBoxAssy J 1 O 472015 44 Air Pressure Switch J 1 J4rtz47 471743 471569 45 Module Ignition Control 1 2 471893 46 TemperatueControler 1 47156 NotShown rg NA Transformer 40 VA Not Shown tT Note Some parts are not listed in above please contact Customer Service Department for detail 471593 Rev 11 1 01 37 NOTES Rev 11 1 01 P N 471593 38 NOTES P N 471593 Rev 11 1 01 39 NOTES Rev 11 1 01 P N 471593 Pentair Pool Products Because reliability matters most MiniMax NT Low NOx Heaters Limited Warran
19. 4 Ignitor on no valve A Valve coil open B Open valve wire C Bad control check voltage between V1 amp V2 5 Flame okay during TFI A Bad ignitor no flame sense after B Bad S1 wire C Poor ground at burner D Poor flame check flame current FLAME SENSOR CURRENT CHECK MULTI PURPOSE METER USE MICROAMP SCALE Figure 25 2465H MODULE SERVICE CHECKS Flame current is the current which passes through the flame from the sensor to ground The minimum flame current necessary to keep the system from lockout is 0 7 microamps To measure flame current connect an analog DC microammeter to the FC1 FC2 terminals per figure Meter should read 0 7 pA or higher If meter reads below 0 on scale meter leads are reversed Disconnect power and reconnect meter leads for proper polarity Rev 11 1 01 471593 32 Troubleshooting General A CAUTION Possible Cause Heater will not come on Automatic ignition system fails Remedy Check if electrical connections are correct and securely fastened If YES call serviceperson Pump not running Place pump in operation Pump air locked Check for leaks Filter dirty Clean filter Pump strainer clogged Clean strainer Defective wiring or connection Repair or replace wires Defective pressure switch Replace switch Defective gas controls Call serviceperson On Off switch in OFF position
20. 471597 471601 71836 471822 471696 72003 472001 471668 71819 471820 471575 471581 71651 471580 471647 471645 471573 471669 471574 471768 471576 471767 471577 71646 471579 471994 471743 471562 471565 471727 71659 471726 N A 471859 m Iu ol2 ar 5 5 5 2 2 c o Q m PISSIS o 2 SEIS UJ gt o 2 Baffle Heat Exchanger 8 16 250 400 1 1 1 112 250 40 1 Burner 5 8 250 1400 1 acket Upper Panel Left acket Divider acket Lower Panel Left acket Upper Subplate acket Lower Panel Right ase Heat Shield 1 1 WIN 1 2 7 1 1 1 1 1 2 2 Return ifo F 1 00 c 00 o c c c 0 emperature Controller ight Door Assy eft Door Assy 5 N A 471428 NA 5 8 250 400 471984 Note Some parts are not listed in above please contact Customer Service Department for detail 2 4 2 0 lt Le 0 2 5 5 o z o 5 a amp 3 LI gt o ola ole o 5 g A 7A 32 J 33 y NA P N 471593 Rev 11 1 01 35 MINIMAX NT LOW NOx HEATER Dual Voltage MiniMAX NT Low NOx Dual Voltage Rev 11 1 01 471593 36 MiniMax NT Low NOx Dual Voltage Re
21. E 123 250 V PLOT DUTY ONLY hor USED DISPLAY MODE ye RELAY IGN MODULE G VALVE LIMITS POWER TPROBE REMOTE BLOWER ape AUX1 2 I L 2 BLOWER POWER LINE 3 E a BLOWER POWER LINE lt e E E amp c ola z w 5 al lolo 2 E Bg 05 REMOTE POOL OFF SPA THERMOSTAT SELECT SWITCH Figure 8 EN COMMON Rev 11 1 01 471593 10 Installation Single Voltage Wiring iagram D iring ic Ignition Max NT Low NOx 400 HSI Electron SINGLE VOLTAGE ini ANO OVA 021 Alddns 83309 1v901 HO 3009 VolIHLo313 TIVNOILVN SHL OL IWHOJNOO LSNW 3ONVITddV OL ONIHIM ONILO3NNOOH3LNI ONILVH 3H 1 vH3dWWal O SZL A009 ADNVD 81 3ulM
22. MiniMax NT Low NOx Series POOL amp SPA HEATERS OPERATION amp INSTALLATION MANUAL FOR YOUR SAFETY READ BEFORE OPERATING Warning If you do not follow these instructions exactly a fire or explosion may result causing property damage personal injury or loss of life For additional free copies of this manual call 800 831 7133 Pentair 001 Products Because reliability matters most To Consumer Retain For Future Reference U S Patent Numbers 5 318 007 5 228 618 5 201 307 4 595 825 AWARNING Warning Improper installation adjustment alteration service or maintenance can cause property damage personal injury or death Installation and service must be performed by a qualified installer service agency or the gas supplier WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance For Your Do not touch any electrical switch do not use any phone in your building Safety Immediately call your gas supplier from a neighbor s phone Follow the gas supplier s instructions If you cannot reach your gas supplier call the fire department Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or other appliances Pentair Pool Products Inc 1620 Hawkins Ave Sanford NC 27330 919 774 4151 10951 W Los Angeles Ave Moo
23. NIHIM AHOLOVH TVNIOIHO INVHOVIG 5NIUHIM STAGOW T1V XON MOT LN XeNIUIN z o e H3HSVM SNLLLOO LNIYd M3HOS GNNOYD AL34VS Alddns ILYNIWYIL WNYSLXS P N 471593 Installation Plumbing WATER CONNECTIONS Reversible Inlet Outlet Connection The MiniMax NT Low NOx heater is factory assembled with right side inlet outlet water connections The inlet outlet header can be reversed for left side water connections without removing the heat exchanger Reversing Water Connections Tools required 1 4 in Screw Driver 9 16 in Socket and Wrench 1 2 in amp 9 16 in Open Wrench Remove the right and left large inspection plates 2 Disconnect all wires from the high limit switches except the short jumper wire Disconnect the pressure switch wiring 4 Remove the temperature sensing bulb from the inlet outlet header Note If needed you may cut the wire ties holding them together 5 Remove the 16 bolts holding the main inlet outlet head and return head in place exchange the heads using the new tube seals supplied with the heater re install the 16 bolts using moderate torque 6 Install the temperature sensing probe by passing the wires through the hole provided on the left side of the brace panel Route wires through the support bracket 7 Reconnect all the high limit wires and the pressure switch wiring routing the wires through the same hole as th
24. OL INSTALLATION If the heater is below water level the pressure switch must be adjusted This adjustment must be done by a qualified service technician See Page 22 Figure 20 P N 471593 Installation Gas Line GAS CONNECTIONS 14 Pipe Sized For Length Of Run In Equivalent Feet Table 1 GAS LINE INSTALLATIONS Before installing the gas line be sure to check which gas the heater has been designed to burn This is important because different types of gas require different gas pipe sizes The rating plate on the heater will indicate which gas the heater is designed to burn Table 1 shows which size pipe is required for the distance from the gas meter to the heater The table is for natural gas at a specific gravity of 65 When sizing gas lines calculate three 3 additional feet of straight pipe for every elbow used When installing the gas line avoid getting dirt grease or other foreign material in the pipe as this may cause damage to the gas valve which may result in heater failure The gas meter should be checked to make sure that it will supply enough gas to the heater and any other appliances that may be used on the same meter The gas line from the meter will usually be of a larger size than the gas valve supplied with the heater Therefore a reduction of the connecting gas pipe will be necessary Make this reduction as close to the heater as possible The heater and any other gas appliances
25. OWN arrow TEMP keys Set the Hour to the proper time P will show to the right for PM and blank for AM p Once the proper Hour is visable press the SET key The Minute icon s will TEMP now start flashing e 4 TEMP MODE e 5 With the Minute icon s flashing use the UPIDOWN arrow TEMP keys and select the proper Minute setting then press the SET key The Day and Time are E now set and the Day icon will be flashing V TEMP SET e PROGRAM MODE e 6 Press the SET and MODE keys at the same time to return to the Operational Mode SET e PROGRAM NOTE During the programming of the CLOCK DAY function you touch only the MODE key and a 9 appears in the upper left corner of the Current Temperature Display Area this represents a delay function and will be used for future functions and accessories to the MiniMax NT Low NOx When the appears simply stop the programmaing do NOT touch any key for 30 seconds the controller will automatically return to the operating mode now by pressing the SET amp MODE keys at the same time you will re enter the programming function and the icon will disappear Rev 11 1 01 P N 471593 Maintenance MAINTENANCE INSTRUCTIONS It is recommended that you check the following items at least every six months and at the beginning of every swimming season 1 Examine the venting system M
26. ake sure there are no obstructions in the flow of combustion and ventila tion air 2 Visually inspect the main burner and the hot surface ignitor The normal color of the flame is blue When flame appears yellow burners should be inspected and cleaned Check ignitor for damage 3 Keep the heater area clear and free from combustibles and flammable liquids LOW NOx Figure 22 ENERGY SAVING TIPS 1 Ifpossible keep pool or spa covered when not in use This will not only cut heating costs but also keep dirt and debris from settling in the pool and conserve chemicals 2 Reduce the pool thermostat setting to 78 F or lower This is accepted as being the most healthy temperature for swimming by the American Red Cross 3 Usean accurate thermometer When the proper maximum thermostat settings have been determined tighten the thermostat knob stopper SPRING AND FALL OPERATION If the pool is being used occasionally do not turn the heater completely off Set the thermostat down to 65 This WINTER OPERATION If the pool won t be used for a month or more turn the heater off at the main gas valve For areas where there is no danger of water freezing water should circulate through the heater all year long even though you are not heating your swimming pool The MiniMax NT Low NOx should not be operated outdoors at temperatures below 0 F for propane and 20 F for natural gas P N 471593 26 Pre
27. anifold pressure All Readings are taken with the heater fired Any adjustments or readings made with heater off will give incorrect readings 6 WC for 400 model P N 471593 Rev C 11 1 01 Installation Indoor 15 INDOOR VENTING General Requirements The vent pipe must be the same size or larger The MiniMax NT Low NOx heaters are capable of a 360 degree discharge rotation and operate with a positive vent static pressure and with a vent gas temperature less than 400 F The total length of the horizontal run must not exceed the length that is listed below in the tables Please note the allowable vent runs for each stack pipe diameter are different and can not be exceeded Note that each 90 degree elbow reduces the maximum horizontal vent run by 8 feet and each 45 degree elbow in the vent run reduces the maximum vent run by 4 feet See the tables below for the maximum vent lengths usinga 90 degree and 45 degree elbows The MiniMax NT Low NOx induced draft pool and spa heater uses positive pressure to push flue gases through the vent pipe to the outside This requires a completely sealed vent System Single wall vent pipe with sealed seams and joints may be used Flue gases under positive pressure may escape into the dwelling with any cracks or loose joints in the vent pipe or improper vent installation The vent pipe must be of a sealed seam construction such as those listed for use with category III appliances Alternately s
28. as supply pressure must be corrected Typical causes are undersized supply piping undersized gas meter or low gas regulator setting gas supply regulator and gas meter problems are typically corrected by your local gas company Rev 11 1 01 21 PRESSURE CONNECTOR amp AIR PRESSURE SWITCH Figure 18 Figure 19 Adjustment Knob Typical Water Pressure Switch Figure 20 Low Gas Pressure Switch P N 471593 Basic Operation 22 SAFETY CONTROLS cont d IGNITION MODULE The Ignition Module is microprocessor based and operates on 24 VAC supplied by the transformer The control utilizes a microprocessor to continually and safely monitor analyze and control the proper operation of the gas burners The module with the presence of the flame sensor ignitor or remote sensor using flame rectification allows the heater to operate HIGH LIMITS A High Limit is a safety device that opens the electrical circuit and shuts off the heater based on a temperature set point within the High Limit Device The MiniMax NT Low NOx series of heaters contains three 3 high limit devices two 2 are located on the main inlet outlet header one sensing the inlet water temperature and one sensing the outlet water temperature The third high limit is located on the exhaust outlet and senses the temperature of the flue gas OPERATION OF IGNITION MODULE HEAT MODE
29. control access door 6 Push in gas control knob slightly and turn clock wise X to OFF If not on OFF position 7 Wait five 5 minutes to clear out any gas If you Gas B then smell gas STOP Follow B in the safety Inlet information above If you don t smell gas go to the next step 8 Turn knob on gas control counterclockwise A to ON see Figure 1 Figure 1 Gas control knob shown in ON position eee TURN OFF GAS TO APPLIANCE 1 Set the thermostat to lowest setting 4 Push in gas control knob slightly and turn Turn off all electric power to the heater if clockwise xy to OFF Do not force service is to be performed 5 Replace control access door 3 Remove control access door Rev 11 1 01 471593 Installation Instructions SPECIFICATIONS IMPORTANT NOTICE These installation instructions are designed for use by qualified personnel only trained especially for installation of this type of heating equipment and related components Some states require installation and repair by licensed personnel If this applies in your state be sure your contractor bears the appropriate license
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31. e thermostat sensor wires 8 Re install the two large inspection plates on the appropriate side PLUMBING VALVES When any equipment is located below the surface of the pool or spa valves should be placed in the circulation piping system to isolate the equipment from the pool or spa Check valves are recommended to prevent back siphon A CAUTION Exercise care when installing chemical feeders so as to not allow back siphoning of chemical into the heater filters or pump Rev 11 1 01 13 Figure 9 PLUMBING CONNECTIONS The MiniMax NT Low NOx heater has the unique capability of direct schedule 40 PVC plumbing connections A set of bulkhead fittings is included with the MiniMax NT Low NOx to insure conformity with Pentair s recommended PVC plumbing procedure Other plumbing connections can be used A CAUTION Before operating the heater on a new installation turn on the circulation pump and bleed all the air from the filter using the air relief valve on top of the filter Water should flow freely through the heater Do not operate the heater unless water in the pool spa is at the proper level MANUAL BY PASS Where the flow rate exceeds the maximum 120 GPM a manual bypass should be installed and adjusted After adjustments are made the valve handle should be removed to avoid tampering we om max Pm 7 Lm m flow rate for the connecting piping BELOW PO
32. eater will try to come on c If you desire to reset the temperature settings of the temperature controller the remote has to be in the desired mode for you to change the particular setting Example You wish to raise or lower the pool temperature from the factory setting you must have the remote system in the pool mode if you wish to change the spa temperature you must have the remote system in the spa mode 5 Now turn on the gas valve to OPEN position the heater is now ready to operate NOTE The heater factory settings are 78 F for the pool and 104 F for the spa When connecting a remote control to the MiniMax you must install the low voltage thermostat wires in separate conduit from ANY line voltage wires AUX Failure to follow these instructions will cause the thermostat relay to react erratically A Remote hook up deactivates the selector keys on the front This icon is not a fault icon but instead indicates a remote thermostat display panel and gives selection control to the remote switching device is connected to the Pentair Temperature Controller 7800 and has overriding selection control of Pentair Temperature 3 WIRE REMOTE Controller 7800 5 AFUSE A FOR AUX2 PILOT DUTY ONLY AUX2 PUMP 10A 5A PURGE MODE 250 V 250 V 531 534 RELAY RELAY PEE BERG PUMP AUX2 642 642 WA A C LOAD PUMP AUX2 TEMPERATUR
33. ecting two wires LINE TERMINAL BLOCK GREEN WIRE INTERNAL WHITE WIRE FACTORY WIRES BLACK WIRE Figure 5 Rev 11 1 01 P N 471593 Installation Remotes TWO WIRE OR THREE WIRE REMOTE HOOK UP Before connecting the remote control system please read the following l First turn the gas valve to the OFF position and power up the heater now using the front buttons on the temperature controller set the SPA and POOL temperature to the maximum setting see Page 24 Now turn the heater to the OFF mode by using the OFF button on the temperature controller see Page 24 or by using the main power switch located on the bottom of the junction box With the heater in the OFF mode locate the three tabs on the back of the temperature controller as viewed from the backside see Figure 6 Two wire remote with temperature control a Using 3 16 female quick disconnect connectors connect one wire to the GND tab of the temperature controller then the second wire to either the SPA or POOL tab al POOL SPA GND Figure 6 b Now return power to the heater but leaving the temperature controller in the OFF position see Page 24 Note If you used the main power switch to turn off the heater now turn the main power switch on At this time the remote system has control over the heater and will turn it on and off when called for b
34. he flame sensing curcuit the ignition module and Pentair Temperature Controller 7800 will shut down and will display an ignition fault and luminate the red service light Please note that on initial firing of heater when gas supply piping is full of air or after long period of non operation of the heater it is normal for the first ignition attempt to not complete To clear the fault condition power to the Pentair Temperature Controller 7800 must be cycled to reset system If heater continues to fail to light have heater inspected by a qualified service person before placing heater back in service Insufficient waterflow pump icon displays excessive water temperature high limit icon cause a soft lockout of the firing sequence which means if the cause of the problem clears by itself or with human intervention ie turning on pump etc such as a slow to prime water pump finally pumping adequate waterflow causing the water pressure safety switch to close the ignition sequence automatically restarts again The other category of fault conditions lead to a hard lockout of the firing sequence which require a qualified service person to correct before the heater is returned to service In hard lockout the heater must be manually reset by toggling power to Pentair Temperature Controller 7800 after correction of the fault condition Examples of causes of hard lockouts include inadequate gas supply pressure and or failure of fan
35. hin 1 second The gas valve is de energized and the control starts a new ignition sequence in an attempt to relight the burner If the burner does not relight the control will go into lockout requiring a manual reset P N 471593 Rev 11 1 01 Thermostat Programming amp Layout 23 MINIMAX NT LOW NOx PENTAIR TEMPERATURE CONTROLLER 7800 See Figure 21 for keypad and Pentair Temperature Controller layout details GENERAL The MiniMax NT Low NOx Pentair Temperature Controller 7800 is the heart of the control system It controls all functions of the heater after first verifying that all safety controls are functioning normally If a malfunction is detected the Pentair Temperature Controller 7800 will flag the error with both the RED Service LED lighting and a corresponding LCD icon appearing on the Pentair Temperature Controller 7800 pin AUX pointing the affected safety control s NOTE The exception is the AUX REMOTE This icon is not a fault icon LCD icon which appears when a REMOTE Control or Remote Switch is connected to but instead indicates a remote the Pentair Temperature Controller 7800 which overrides the POOL and SPA keypads on the control giving ON selection control to the REMOTE switching device is connected to the Pentair Temperature Controller 7800 and has BASIC THERMOSTAT OPERATION overriding selection control of Pentair Temperature Controller 7800 The Pentair Temperature Co
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37. ing maintained See your local pool dealer for help in properly balancing the water chemistry P N 471593 Troubleshooting Normal Operation Sequence of Heater 28 NORMAL OPERATION SEQUENCE Refer to Figure 21 of Pentair Temperature Controller 7800 keyboard The heater features a fully automated firing start up and shutdown sequence under the control of the MiniMax NT Low NOx Pentair Temperature Controller 7800 Now that the heater has been properly installed and wired for either remote operation or local operation and you have setup the Pentair Temperature Controller 7800 temperature setpoints as described earlier in manual in Thermostat section the following is the normal operating sequence when the heater turns on the and the thermostat calls for heat for the pool or spa 1 The fan will start beginning the heater s safety prepurging cycle which lasts for 2 minutes If at anytime during the prepurge cycle the Pentair Temperature Controller 7800 detects that a safety control is not working due to either a safety control malfunction or other unsafe condition the firing sequence will stop until the unsafe condition is removed the fault icon related to the problem will illuminate 2 After proper completion of the prepurge cycle the hot surface ignitor glow coil will turn on preheat for 40 seconds Once the 40 seconds is passed the main gas valve will open At this time if flame is not safely established and is dectected by t
38. ingle wall or double wall type B duct which has had duct seams and joints permanently sealed using cements or other suitable means which are rated for use at the flue gas temperatures of 325 F and are permanent are acceptable The use of listed thimbles roof jacks and or side vent terminals are required and the proper clearances to combustible materials must be maintained in accordance with type of vent pipe employed in the absence of a clearance recommendation by the vent pipe manufacturer the requirements of the Uniform Mechanical Code should be met The ventilation air requirements for the MiniMax NT Low NOx heater and can be found on page 17 It is recommended that vent runs over 18 feet be insulated to reduce condensation related problems and or the use of a condensate trap in the vent run close to the heater may be necessary in certain installations such as cold climates The MiniMax NT Low NOx is suitable for through the wall venting Recommended sources for Side wall vent hood terminals include The Field Controls Co 2308 Airport Road Kingston NC 28501 800 742 8368 and Tjernlund Products Inc 1601 Ninth Street White Bear Lake MN 55110 800 255 4208 consult manufacturer for model information and availability ACAUTION Do NOT combine exhaust vent pipes to a common exhaust vent in multiple unit installations Run separate vent pipes 45 ft Maximum Vent Run 5 in O D vent Equiv ft 22 ft Maximum Vent Run 4 in O D vent
39. k cover of this manual and a copy of the warranty and warranty registration card are included with the product Return the warranty registration card after filling in the serial number from the rating plate inside the heater Pentair Pool Products high standards of excellence include a policy of continuous product improvement resulting in your state of the art heater We reserve the right to make improvements which change the specifications of the heater without incurring an obligation to update the current heater equipment SAFETY RULES Spa or hot tub water temperatures should never exceed 104 F A temperature of 100 F is considered safe for a healthy adult Special caution is suggested for young children Drinking of alcoholic beverages before or during spa or hot tub use can cause drowsiness which could lead to unconsciousness and subsequently result in drowning Pregnant women beware Soaking in water above 100 F can cause fetal damage during the first three months of pregnancy resulting in the birth of a brain damaged or deformed child Pregnant women should stick to the 100 F maximum rule 4 Before entering the spa or hot tub the user should check the water temperature with an accurate thermometer Spa or hot tub thermostats may err in regulating water temperatures by as much as 4 F 5 Persons with a medical history of heart disease circulatory problems diabetes or blood pressure
40. llow exclusion or limitation of incidental or consequential damages so the above may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from state to state HEATER SERIAL NUMBER Please Fill In Pentair Pool Products Inc 1620 Hawkins Ave Sanford NC 27330 919 774 4151 10951 W Los Angeles Ave Moorpark CA 93021 805 523 2400 P N 471593 Rev 11 1 01
41. low apply to all MiniMax NT Low NOx heaters REQUIRED AIR SUPPLY Air Ventilation Sq In Air for Combustion Sq In 200 200 200 250 250 250 300 300 300 400 400 400 Table 2 NOTE The openings listed in Table 2 are free open vent area if the vents incorporate restrictive louvers the vent openings must be increased to compensate for the area blocked by the louvers or grills INSTALLATION ON FLOORS CONSTRUCTED OF COMBUSTIBLE MATERIALS The heater may be placed on a combustible floor using either of the two methods listed below a Use Listed Factory Non combustible Base Kit for use on combustible floors Non Combustible Base Kit 471961 471960 460508 LS Rev 11 1 01 17 b Construct a non combustible base from masonry blocks as illustrated see Figure 14 O HOLLOW MASONARY BLOCKS NOT LESS THAN 4 THICK LAID WITH ENDS UNSEALED AND JOINTS MATCHED FOR AIR CIRCULATION COVER BLOCKS WITH 24 GA MIN GALVANIZED SHEET METAL Figure 14 ACAUTION Chemicals should not be stored near the heater installation Combustion air can be contaminated by corrosive chemical fumes which can void the warranty INDOOR VENT ADAPTORS FITS ALL MODELS The proper draft hood and adapter must be installed on the heater as shown below and on pages 15 and 16 Product No Indoor Vent Adaptor Figure 15 P N 471593 18 Installation In
42. must be disconnected from the gas supply piping system during any pressure testing on that system greater that 2 PSIG The heater and its gas connection must be leak tested before placing the heater in operation Do not use flame to test the gas line Use soapy water or another nonflammable method A manual main shut off valve must be installed externally to the heater AWARNING Do not install the gas line union inside the heater cabinet This will void your warranty 10 30 50 350 400 600 10 20 150 200 450 REGULATED MANIFOLD PRESSURE TEST 1 Attach the manometer to the heater jacket 2 Shutoffthe main gas valve 3 Remove 1 8 in NPT plug on the outlet side of the valve and screw in the fitting from the manometer kit 4 Connect the manometer hose to the fitting 5 Turn on the heater 6 The manometer must read 4 in WC for natural gas while operating 7 Foradjustment remove the Regulator Adjustment Cap and using a screwdriver turn the screw clock wise to increase counterclockwise to decrease gas pressure Regulator Adjustment Cap 1 8 NPT Plug Inlet Press a 1 8 NPT Plug Manifold Press Figure 10 A CAUTION The use of Flexible Connectors FLEX is NOT recommended as they cause high gas pressure drops MINIMAX NT LOW NOx GAS PRESSURE REQUIREMENTS Maximum inlet gas pressure Minimum inlet gas pressure Normal m
43. ntroller 7800 comes pre programmed for use with the spa temperature set at 104 and the pool temperature set for 78 F and with default display mode set to display degrees F this may be adjusted to display in degrees C with jumper on back of board see Figure 21 You need not do anything further to enjoy your heater other than set it in the pool or spa mode by depressing the key located under the corresponding POOL or SPA LED light The LED above the selection will light and the corresponding POOL or SPA LCD icon on the display will appear NORMAL OPERATION NO REMOTE Each temperature setting in either POOL or SPA mode is settable independently If the Factory s presetting of 78 F for Pool and 104 F for Spa is not desirable you may adjust these settings See page 24 for changing the Factory Temperature Settings To set the temperature while in SPA mode press the TEMP UP key with UP arrow to increase or TEMP DOWN with DOWN arrow to decrease the set temperature to that desired NOTE The left hand display indicates the current real time temperature To set the temperature for POOL mode first switch to POOL mode by depressing the POOL key and repeat the temperature setting procedure in this example The Pentair Temperature Controller 7800 remembers the last set temperature for both the POOL and SPA mode and you may cycle between the two settings with the POOL and SPA selector keys In
44. o a flame roll out or other abnormal condition causing excessive temperatures in the cabinet The cause of the fault must be corrected and the one shot fuse replaced before icon can be cleared This fault icon displays whenever there is a failure of either the low gas pressure switch due to low pressure or switch failure or additionally the fan and or air pressure switch circuit has failed resulting in an open safety circuit The nature of these faults are mission critical for the safe operation of the heater and result in a hard lockout The cause of the fault must be corrected and the heater will require a manual reset by toggling the power supplied to the 7800 Controller to clear the fault ey ge o m FAN This fault icon displays whenever insufficient waterflow causes the water pressure switch to fail to close This is a soft lockout condition and will clear by itself if the waterflow is restored The icon will then clear and if the heater was attempting to fire the cycle will restart and continue U JJ m o o P N 471593 Rev C 11 1 01 Troubleshooting amp Service 31 SERVICE CHECKS IGNITION MODULE Service Checks 1 Dead A Miswired B Transformer bad C Fuse Circuit breaker bad D Bad control check LED for steady on 2 Thermostat on no ignition A Miswired B Bad thermostat no voltage at terminal W 3 Valve on no ignitor A Defective ignitor B Miswired C Bad control check voltage at ignitor
45. ocated within a 10 ft radius Must be located the following distances away from any door window or gravity air inlet 4 ft below or 4 ft horizontally or D 1 ft above Rev 11 1 01 P N 471593 Basic Operation 20 GENERAL DESCRIPTION The MiniMax NT Low NOx Pool and Spa Heater is a fan assisted induced draft appliance The MiniMax NT Low NOx is available in 200 000 250 000 300 000 and 400 000 btu hr capacities and are certified for both indoor and outdoor installations The MiniMax NT Low NOx version natural gas pool heater must be used for installations in the South Coast Air Quality Management District SCAQMD these heaters are certified to comply with SCAQMD Rule 1146 2 and also meet Ventura Co APCD Rule 74 11 1 The MiniMax NT Low NOx is designed to operate both in stackless outdoor installations and in indoor stack vent installations the indoor installation may be made using Kit 460506 or 460507 see pages 6 and 17 vertical vent pipe or with a horizontal vent pipe and a Listed side wall vent BASIC SYSTEM OPERATION TO OPERATE HEATER 1 Start pump make sure the pump is running and is primed to close water pressure switch and supply power to heater 2 Setthermostat to lowest setting by using up down arrow keys See page 24 Push the off key on the Pentair temperature controller 7800 the amber off led will illuminate See page 24 4 Open the access doors Push in the gas control knob
46. odule does not operate unless the air pressure switch and all safety switches are closed NOTE Some models of MiniMax NT Low NOx heaters manufactured before 10 15 01 used both a HIGH and LOW air pressure switch WATER PRESSURE SWITCH The water pressure safety switch closes when there is a sufficient flow of water to the heat exchanger to safely operate the heater The switch operation must be verified during initial operation of the heater after installation the switch is set at 1 PSIG and the switch contacts must not be closed in the absence of water flow NOTE See Below Pool Level Installation instructions on page 13 The switch may remain closed with no water flow if there is more than a 3 ft elevation difference between the heater heat exchanger and the pool water line if this is the case the water pressure switch must be reset to maintain open switch contacts with no water flow NOTE If the pool is more than one floor above or one floor below the heater the pressure switch may have to be replaced with a flow switch LOW GAS PRESSURE SWITCH LOW NOx Versions Only The MiniMax NT Low NOx heater uses a low gas supply pressure switch ahead of the gas valve to prevent operation of the heater when the gas supply pressure is below the minimum required for proper operation of the burners The switch is factory set In the event that the switch does not close and prevents the firing ofthe heater the cause ofthe low g
47. placement parts TEM DESCRIPION ary 20 250 300 400 PT Exhaust 6a Gasket 3 TopCover 1 X f 471885 471692 471886 471591 4 ExhaustAssy d 1 o 472014 472013 5 ShutoffSafetySwitch Exhaust 1 4 714 6 Blowr 1 1 farge 471883 471884 7 Gasket Blower 1 X A Jj J 476100 J 8 Collector Assy 1 472008 472007 472006 472005 9 Retum Manifold AssyNon ASME 11 J 4710991 12 FreboxAssy 1 f 471904 471835 471922 471821 13 Heat Exchanger Assy Non ASME 1 471910 471785 471928 471838 15 ThermistorProbe J _ 1 To 47886 E 16 Hi LimitThermostat 115 F 1 4 47105987 17 Hi Limit Thermostat 150 F 1 J _ 471694 18 WaterPressueSwich J 1 32 247672 19 Main Manifold Assy Non ASME 1 J 471992 20 Adapter BulkheadRing 2 2 27 440 21 Adapter Bukhead 2in 2 4A 41r441 22 Gasket Fin Tube Sea 18 0709581 23 HowValveAssy d 1 J 4 471790 26 GasValveNatwalGas 1 3 471600 27 BumerTrayAssy 1 471905 471836 471923 471981 28 lgnter 0 0 1 471696 29 GasManifoldAssy 1 472004 472
48. rpark CA 93021 805 523 2400 Rev 11 1 01 471593 Table of Contents pingere 3 ei rTo n 3 Important Notices UR 3 Code REGUIFEMENIS E RR sala edema 3 Warranty ntormation zo oet ee ete ci eb Deas d dde cerne ese tn p e p ete 4 ODER AMON e M 4 REM M M 4 HSI Hot Surface Ignition Lighting Operation Natural Gas sseeenenennnnnnnnnnnentnnnns 5 Installation Instructions Specifications ee 6 Ion 7 Installation Remotes 2 and 3 Wire 8 9 Installation Wiringi cic retra decere niger edente d repe Pep Hg n e 10 12 Installation Water Connections E EU ER pta EC d ge ede d rend 13 Installation PIUmbIng cte dr ro t d ERE OE OR ED d E HE ER 13 installation Gas Line 2 5 rere re tete tet aii pen ree e e b ee re bc CR EE S 14 Pipe Sizing Chart Gas Pressure Requirements sss tenerent tenente nentes 14 Regulated Manifold Pressure Test eate Phat eal etra Read 14 Venting Indoor Installations n os iaaa rea rennende nte nter tite retenti retentis 15 18 Venting Outdoor Installations ettet cecinit ciet teneret ete e ete Ka cea 19 Basic Operation General Descriptioni 1 1er een o HR i PR RE T QI ate ic tee
49. s the exception is you may still stop the heater with the OFF key o o 0 oO 0 OG O SYSTEM v V NORMAL IQOFJIQOOF 1 SERVICE CURRENT TEMP SET TEMP TIME POOL OR SPA Eis eels DISPLAY ALTERNATELY SEA eeen ON LCD TO SHOW ACTIVE SELECTION S P S P reai r AE GN H LMT PRESS FAN AUX TFUSE FAULT CONDITION LCD ICONS e d POOL OFF SPA t PROGRAM STEP dum 8 SS N te Figure 24 Illustration of Pentair Temperature Controller 7800 with all fault icons displayed for clarity Rev 11 1 01 P N 471593 Troubleshooting amp Service 30 LEGEND OF FAULT ICONS AND TYPE OF PROBLEMS FLAGGED This fault icon displays whenever there is an unexpected loss of flame This condition may arise from air in gas supply line or malfunction of flame detection circuit or related hardware This is a hard lockout condition requiring a manual reset to clear Q Z This fault icon displays whenever one or more of safety temperature limit switches open to flag an excessive temperature condition This is a soft lockout condition and if the condition clears the fault icon will clear and normal operation of heater will procede i This fault icon displays whenever the thermal fuse has opened due t
50. s and should never be employed for use as space heating boilers general purpose water heaters in non stationary installations or for the heating of salt water Do not use the heater to protect pools or spas from freezing if the final maintenance temperature desired is below 60 F as this will cause condensation related problems CODE REQUIREMENTS The installation must conform with local codes or in the absence of local codes with the latest National Fuel Gas Code ANSI Z223 1 and the latest edition of the National Electrical Code NFPA 70 Installation in Canada to be made in accordance with the latest CAN CGA B149 1 or 2 and CSA C22 1 Canadian Electric Code part 1 member CERTIFIED Rev 11 1 01 P N 471593 Operation This instruction manual provides operating instructions installation and service information for the MiniMax NT Low NOx high performance heater The information in this manual applies to the MiniMax NT Low NOXx 200 250 300 and 400 natural gas models It is very important that the owner installer read and understand the section covering installation instructions and recognize the local and state codes before installing the MiniMax NT Low NOx History and experience has shown that most heater damage is caused by improper installation practices WARRANTY INFORMATION The MiniMax NT Low NOx pool heater is sold with a limited factory warranty Specific details are described on the bac
51. s may become blocked If pH is too low over acid the following conditions may occur 1 Excessive eye burn or skin irritation 2 Etching of the plaster 3 Corrosion of metal fixtures in the filtration and recirculation system which may create brown blue green or sometimes almost black stains on the plaster 4 Corrosion of copper in the heater which may cause leaks 5 Ifyou have a sand and gravel filter the alum used as a filter aid may dissolve and pass through the filter CAUTION Do not test for pH when the chlorine residual is 3 0 ppm or higher or bromine residual is 6 0 ppm or higher See your local pool supply store for help in properly balancing your water chemistry RULE Chemicals that are acid lower pH Chemicals that are alkaline raise pH Table 4 pH Control Chart Add Soda Ash or Marginal Ideal Marginal Add Acid Sodium Bicarbonate ALKALINITY High Low Total alkalinity is a measurement of the total amount of alkaline chemicals in the water and control pH to a great degree It is not the same as pH which refers merely to the relative alkalinity acidity balance Your pool water s total alkalinity should be 100 140 ppm to permit easier pH control A total alkalinity test is simple to perform with a reliable test kit You will need to test about once a week and make proper adjustments until alkalinity is in the proper range Then test only once every month or so to be sure it is be
52. setting press the proper TEMP key until the desired setting is displayed o 4 TEMP NOTE During Programming of the Pool Temperature the two buttons on the 1 TEMP right are used to or the display setting numbers Increase Decrease Raise Lower NOTE Pool Temperature is now set 4 You can leave the right window displaying the set Temperature or by pressing the MODE key you can return to the Time Mode C NOTE To re set the Spa Temperature follow the above steps 1 through 4 g V TEMP while in the Spa Heating Mode TIME SETTING 1 Make sure heater is turned OFF and not in the POOL or SPA ON Mode POOL OFF 2 Place the Controller in Programming Mode by depressing SET and MODE buttons at same time SET e _ MODE NOTE During Programming of the Time Setting the two buttons on the right STEP are used to Cou the display setting numbers 1 TEMP P N 471593 Rev C 11 1 01 Time Setting Programming 25 TIME SETTING cont d 3 The first setting once you enter the Programming Mode will be the Day The Day icon will be flashing Use the UP or DOWN arrow TEMP keys to locate 1 zw the appropriate day then press the SET key The Day is now set and the Hour ve Time icon will start to flash B e PROGRAM MODE e 4 With Hour Time icon flashing use the UP D
53. ssure Relief Valve In some installations a pressure relief valve PVR is required on the MiniMax NT Low NOXx To install a PRV carefully drill a 3 8 1n hole in center of 3 4 in NPT port on main header being careful to drill only thru wall at bottom of 3 4 in NPT port and no deeper now thread in the 3 4 NPT PRV NOTE A S M E version varies from illustration It is of bronze construction and is supplied with the A S M E Section IV pressure relief valve pre installed at factory Test the relief valve at least once a year by lifting up lever FOR PRV INSTALLATION DRILL THRU Figure 23 5 Settime clock to start circulation system no earlier than daybreak The swimming pool loses less heat at this time 6 For pools that are only used on the weekends it is not necessary to leave the thermostat set at 78 F Lower the temperature to a range that can be achieved easily in one day Generally this would be 10 to 15 F if pool heater is sized properly 7 During the winter or while on vacation turn the heater off 8 Set up a regular program of preventative maintenance for the heater each new swimming season Check heat exchanger controls burners operation etc will keep the pool and the surrounding ground warm enough to bring the pool up to a comfortable swimming temperature in a shorter period of time Where freezing is possible it is necessary to drain the water from the heater This may be
54. t 20 Basic Operation Safety Controls e ope cre o ar e ta to ab dece re re ee dn 21 22 Basic Operation HSI Ignition Module sentiet hte tet de te nei e Ee DUE He 22 Thermostat Programming amp LayOUt cocci tente rte fefe E e re Fed eH Pee o Te e PR 23 Temperature amp Time Setting entente tnnt ntt rnnt ttti ttti nett nnt nen eet tt aas 24 25 Maintenance en cca ecce reg dn en ied iud OL adea Den ru Vau PX Kad ELCHE iva Na nd egi 26 Maintenance INStruCtiOns s c htec taedet ta att ct b REG et bcn UR Eu ir gs 26 Pressure Relief Valve T 26 Maintenance Water Treatment cain ertet tete e de 27 Trouble ShoDlilig c i sen tae 28 Normal Operation Sequence od rt hen OR E Pu il eem de edi ad 28 29 Troubleshooting Service 2 9 239 Ea etica beide Eat feni eid alat adeft mee NSE 30 31 Troubleshooting Gerieral cire itn een dicnnt e I de n HH e de de e te 32 MiniMax NT Low NOx Parts List amp Exploded View Single Voltage 33 34 MiniMax NT Low NOx Parts List amp Exploded View Dual 35 36 Warranty Information Enn
55. ty Your MiniMax NT Low NOx pool heater is another quality product from Pentair Pool Products Inc and is backed by the following warranty 1 The following parts are warranted for 5 years from date of purchase The MiniMax NT Low NOxXx cabinet and combustion chamber the main burners and burner manifold the inlet outlet header and the return header This warranty does not cover rusting or corrosion on cabinets or burners that does not affect the heater s operation The following parts are covered for 2 years from date of purchase The automatic flow control valve all controls heat exchanger pilot generator and the pilot assembly This warranty only applies to the original purchaser 3 This warranty shall not apply to any units or parts which have been subject to accident negligence alteration abuse misapplication or misuse The above warranty applies only if the heater is installed and operated in complete compliance with the installation and operation manual provided with each unit Copies of this manual are available by writing to Pentair Pool Products Inc at the address below Pentair Pool Products Inc assumes no liability except for the repair or replacements of parts as specified above Ship defective parts or equipment along with serial number and purchase date transportation prepaid to the address below Purchaser shall be responsible for freight charges for return of merchandise to purchaser Some states do not a
56. y the remote system thermostat thus keep the pool and spa at the desired temperature AUX2 PUMP 10A 5A PURGE MODE in 250 V CR 35 RELAY RELAY BAB BBR PUMP AUX2 642 642 10A TEMPERATURE L23 250V DISPLAY MODE RELAY IGN MODULE G VALVE LIMITS POWER TPROBE REMOTE BLOWER 2 123456 2 AUX1 eej Ie go el leo al loo ao oo ba i i L iii 5AFUSE FOR AUX2 PILOT DUTY ONLY A C LOAD PUMP AUX2 PILOT DUTY ONLY NOT USED AIR PRESS POOL SPA GND H LIMIT T FUSE GND REMOTE SWITCH CONTROLLER Three Wire continued on next page P N 471593 BLOWER POWER LINE BLOWER POWER LINE Figure 7 Rev C 11 1 01 Installation Remotes TWO WIRE OR THREE WIRE REMOTE HOOK UP cont d Three wire remote a Using 3 16 female quick disconnect connectors connect the common wire to the GND tab of the temperature controller then connect the two remaining wires to the temperature controller corresponding to the remote control device pool wire to POOL tab spa wire to SPA tab b Now return power to the heater Note If you used the main power switch to turn off the heater now turn the main power switch on At this time the remote system has control over the heater and if pool or spa temperature is below the temperature controller setting then the h
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