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Pentair MiniMax NT LN User's Manual
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1. U Connect the Manometer hose to the fitting Turn the gas valve knob to ON Turn on the heater and read the Manometer Soy Du P The Manometer must read per the values of the Gas Pressure Requirement Table on manifold side of the gas valve while operating 8 Ifreading is below specified check the inlet pressure while the heater is running to make sure of proper supply before attempting adjustments MiniMax NT LN Illustration above is for Natural Gas see Table 5 9 For adjustment remove the Regulator Adjustment Cap and using a screwdriver turn the screw clockwise to increase counterclockwise to decrease gas pressure ACAUTION The use of Flexible Connectors FLEX is NOT recommended as they cause excessive high gas pressure drops GAS PRESSURE TS Regulator Adjustment Cap 1 8 NPT Plug Inlet Press E gt NOTE All readings must be taken while heater is operating Any adjustments or readings made while heater is off will result in performance problems Figure 4 Manifold Press All Values are 0 2 inch W C 6 inch W C for LN 400 Model 1 8 NPT Plug Table 5 Rev E 4 19 05 P N 472089 Section II Installation INDOOR VENTING General Reguirements 14 The vent pipe must be the same size or larger The MiniMax NT LN heaters are capable of a 360 degree discharge rotation and operate with a positive vent static pressure and with a vent gas tem
2. HEAT MODE When a call for heat is received from the thermostat supplying 24 volts to the TH terminal the module will check the pressure switch for normally open contact The combustion blower is then energized and once the air pressure switch contacts close the 15 second pre purge period begins After pre purge the hot surface igniter is energized for approximately 40 second heat up period followed by the gas valve for the trial for ignition TFI period for maximum of 7 seconds for the LN model When the flame is detected during the TFI period through the flame sensor the igniter is deactivated and the gas valve remains energized Note After the pre purge period the combustion blower slows down to half normal speed during the heat up and TFI periods and continues thereafter for another 30 seconds at low speed then return to full speed for the remainder of the heating cycle The thermostat air pressure switch and burner flame are constantly monitored to assure that the system operates properly When the thermostat is satisfied and the demand for heat ends the gas valve is immediately de energized the module senses the loss of flame signal and initiates the 45 second post purge period before de energizing the combustion blower 2 FAILURE TO LIGHT THE BURNER LOCK OUT Should the main burner fail to light or the flame is not detected during the first TFI try for ignition cycle the gas valve is de energized and the ignitio
3. OFF 10 If the appliance will not operate follow the instructions NOTE Knob cannot be turned to OFF unless knob is To Turn Off Gas To Appliance and call your service tech pushed in slightly Do not force nician or gas supplier 6 Wait five 5 minutes to clear out any gas If you then smell gas STOP Follow B in the safety information above If you don t smell gas go to the next step Gas gt 7 Turn gas control knob counterclockwise to ON Inlet See Figure 19 8 Close the access doors and set the thermostat to desired Mode POOL SPA or REMOTE Figure 19 Gas control knob shown in ON position TO TURN OFF GAS TO APPLIANCE 1 Turn off all electric power to the appliance if service is to 3 Open access doors be performed 4 Push in gas control knob slightly and turn clockwise 2 Setthe thermostat to OFF CY to OFF Do not force 5 Close access doors Rev E 4 19 05 P N 472089 Section IV Operation SAFETY CONTROLS VACUUM AIR PRESSURE FAN SWITCH The air pressure switch see Figure 20 is a safety device used to insure that the combustion air 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 connected upstream of the ignition module The ignition module does not operate unless the air pressure switch and all safety switch
4. J6 amp J8 will cause the DDTC to switch to the SPA setting and control the heater to the DDTC spa set point temperature If only heating the spa then depress the pool down arrow until the display goes to Off Rev E 4 19 05 PIN 472089 Section V Troubleshooting 28 Troubleshooting Instruction TROUBLESHOOTING DDTC The DDTC temperature display contains three LED s with a decimal point between the first and second this display is also used to display an error code if for some reason there is a failure within the heater control system or a DDTC internal fault The DDTC will display the actual temperature or set point temperature or OFF as selected by the user When DDTC detects an error the display will show Exx see Figure 27 where Exx 1s the error code of DDTC fault see Table 11 Codes 1 through 9 indicate a soft lockout error that means after these errors are fixed the heater will resume normal operation and restart immediately Code ERR indicates a hard lockout error that means after these errors are fixed you need to reset the power of the heater through the switch on the bottom of the electrical junction box on the right side of the cabinet NOTE If Code ERR is shown on the LED display at any time turn the heater off from power switch then turn on the heater again If the error code is still displayed call a certified Pentair Service Technician for repair Code Error 51H E SystemLowVoltage Al L
5. and prevents the firing of the heater the cause of the low gas 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 P N 472089 22 Figure 20 Figure 21 Adjustment Knob Typical Water Pressure Switch Figure 22 Thermal Fuse Figure 23 Low Gas Pressure Switch Rev E 4 19 05 Section IV Operation 23 SAFETY CONTROLS cont d Flame Current Diagnostic LED Check Point 1Flash Air Flow Fault HIGH LIMITS 2 Flashes Flame no Call for Heat 3 Flashes Lock Out A High Limit 1s a safety device that opens the electrical circuit and shuts off the heater based on a water temperature set point within the High Limit Device The MiniMax NT LN series of heaters contains two 2 high limit devices which are located on the main inlet outlet header one sensing the inlet water temperature and one sensing the outlet water temperature OPERATION OF IGNITION MODULE The Ignition Module see Figure 24 is microprocessor based Figure 24 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 using flame rectification allows the heater to operate 1
6. area for gas Be sure to smell next to the floor because some don t try to repair it call a qualified service technician Forced gas is heavier than air and will settle on the floor or attempted repair may result in a fire or explosion WHAT TO DO IF YOU SMELL GAS D Do not use this appliance if any part has been under water Do not try to light any appliance Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system Do not touch any electrical switch do not use any phone in and any gas control which has been under water your building Immediately call your gas supplier from a neighbor s phone Follow the gas supplier s instructions OPERATING INSTRUCTIONS 1 STOP Read the safety information above A through D 9 Set the thermostat to the desired temperature setting 2 Open the access doors Set power switch to OFF see a Ignition module is energized and the pre purge cycle is Figure 25 started approximately 15 seconds 3 Set the thermostat to OFF see page 27 b Fan motor starts which closes Vacuum Air Pressure fan 4 This appliance is equipped with an ignition device which switch automatically lights the burners Do not try to light the burn c Check for powering up the glow coil hot surface ignitor ers by hand by viewing through the glass window or opening on the 5 Push in gas control knob slightly and turn clockwise y burner face plate to
7. they will be in the proper location when installed on the left side 3 Disconnect the water pressure switch wiring 4 Disconnect the temperature sensor wires from the circuit board and feed them back to the header 5 Remove the 8 bolts holding the main inlet outlet head P N 472089 Section III Installation Reversible Inlet Outlet Connection conta On the MiniMax NT LN Series heater there is insulation installed by the factory on the return head side of the heaters This insulation is there so that if the heads are reversed in the field during initial installation of the heater the high limits will be insulated from the heat radiating from the flue collector 6 Return head in position before removal This view shows the insulation installed by the factory Remove the 8 bolts holding the return head in place 7 When heads are removed replace the heat exchanger tube seal gaskets 8 Exchange the inlet outlet header with the return header Lift the insulation to allow the main head to be installed Align header with the heat exchanger When head is placed into position release the insulation it will now shield the high limits from the heat produced by the flue collector Install header bolts and tighten snugly by hand This will help avoid cross threading When tightening use a cross pattern starting from the center of the header DO NOT over tighten P N 472089 10 9 Install the temp
8. though you are not heating your swimming pool The MiniMax NT LN should not be operated outdoors at temperatures below 0 F for propane and 20 F for natural gas Where freezing is possible it is necessary to drain the water from the heater This may be done by opening the drain valve located at the inlet outlet header see Figure 29 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 E 4 19 05 P N 472089 Section VI 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 vears of trouble free service provided you keep your water chemistry in proper condition Maintenance 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 ACAUTION 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 univer
9. 05 471981 471696 472083 471597 472004 472003 472002 472001 471984 7 10 11 2 1 FF y z co o K al 18 19 M N V M DN N o 31 32 33 4 Gas Pressure Switch Sub Gas Manifold Gas Manifold w Orifices 0 2000 O 4 5 6 8 200 250 300 400 4 5 6 8 200 250 300 400 35 Gas Orifice 0 2000 w 6 Burner 471668 37 38 39 0 1 42 471575 471576 471767 472505 472178 472182 472447 472100 471727 472372 471900 471726 075173 471571 472507 460506 4 460507 5 Jacket Upper Panel Left Jacket Upper Panel Right Jacket Upper Sub Plate Junction Box Assembly Air Pressure Switch 0 2000 Module Ignition Control Temperature Controller Assembly Right Door Assembly with Controller Right Door Assembly w o Controller 45 Left Door Assembly Thermal Cut off Not Shown Transformer 40 VA Not Shown Wire Harness Assembly Not Shown Indoor Vent Adaptor See pg 16 Note Parts for ASME and high altitude above 2000 are not listed above please contact our Customer Service Department for details Al A wo Eloo o 2 s 1 15 18 19 2 2 2 23 24 25 2 27 28 2 9 EEN 3 9 EEM 38 9 40 Ea 42 43 4 P N 472089 Rev E 4 19 05 35 NOTES Rev E 4 19 05 PIN 472089 SAVE THESE INSTRUCTIONS Li Pentair Water Pool and Spa Inc Pentair mn 1620 Hawkins
10. 1000 B T U per Cubic Foot o A u A 3 MODEL aa a a z o l z o ne m s a 101001 Co 2 m 2 aor RESIDENTIAL NATURAL GAS 2 STAGE REGULATION In many Natural gas line installations the gas supplier and or installer may utilize a two stage regulation process where by at the streets main gas supply they will install the first stage gas regulator which would be at a higher pressure This higher pressure is usually set at 2 psi or 5 psi and can be for long distances and in a much smaller pipe size 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 Reguirement Charts Stage One High Pressure Gas Pipe Sizing 2 PSI 1000 B T U Per CU FT MAXIMUM EQUIVALENT PIPE LENGTH 0 to 50 Ft 50 to 100 Ft 100 to 150 Ft Stage Two Low Pressure Gas Pipe Sizing Stage 2 set at 7 in W C MAXIMUM EQUIVALENT PIPE LENGTH Table 3 Table 4 P N 472089 Rev E 4 19 05 Section III Installation 13 TESTING GAS PRESSURE Push the power switch to OFF Turn the gas valve knob to OFF Remove 1 8 in NPT plug on the outlet side of the valve and screw in the fitting from the Manometer kit
11. 4 27 Section V Troubleshooting it 28 Troubleshooting DO aa 28 Troubleshooting General vico adas 29 Service Checks Ignition Moquie zrisrititron nska ita 29 Section VIE Maintenance uu u did sanscvenscbsnosiieeseeseecedesiievssGecnetenessiGerssccueetecexsivesstecestvererts 30 Maintenanice InStructions viiuon u e e a r 30 Pressure Rel lero ais 30 Energy Saving PS ia i null paf decals 30 spiina Fallan Winter Operation vita ki A A 31 Chemical Balances diiseni r uya a a 32 Replacement Parts NT LNW DDIC iconos Ade Oia 33 34 Rev E 4 19 05 PIN 472089 Section Heater Identification Information 4 Heater ldentification Information To identify the heater see rating plate on the inner front panel of the heater There are two designators for each heater one is the Model Number and the other is the Heater Identification Number HIN a Heater Identification Number HIN The following example simplifies the identification system 1 HTR Heater 2 200 250 300 or 400 Input rating Btu hr X 1000 3 NT MiniMax NT Series 4 LN Series Character 5 NH Gas type Natural gas and ignition system Hot Surface Ignition 6 Options Blank Standard Model ASME ASME Certified Bronze Headers ASHI ASME Certified Bronze Header and High Altitude Rating HALT High Altitude Rating HEATER IDENTIFICATION INFORMATION HIN H I N HEATER IDENTIFICATION NUMBER ID DESIGNATOR FOR PENTAIR POOL amp SPA HEATERS ASHI
12. 40 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 1t is being maintained See your local pool dealer for help in properly balancing the water chemistry Rev E 4 19 05 33 REPLACEMENT PARTS NT LN w DDTC gt S s e NS 4 a o a Q Rev E 4 19 05 P N 472089 34 Replacement Parts NT LN 472356 472373 472352 471701 472354 472355 472359 472357 ajala SIIS NININ w ow ow DOO U a 471610 472008 472005 472270 471991 471622 072184 471835 471922 472332 472362 Heat Exchanger w Headers 71910 471838 Heat Exchanger w o Headers 471933 471934 471935 471936 8 16 Baffle Heat Exchanger 200 250 300 400 471642 471641 471896 471640 Thermistor Probe 471566 Hi Limit Thermostat 115 F 471587 Hi Limit Thermostat 150 F 471694 Water Pressure Switch 472125 In Out Top Sub Header Assembly 472363 20 In Out Main Header Assembly 471992 21 In Out Bottom Sub Header 472364 22 Cap In Out Bottom Sub Header 471420 23 Ring Adapter 274494 4 Adapter Bulkhead Ring 274440 5 Adapter Bulkhead 2 471441 26 Gasket Fin Tube Seal 070951 7 Flow Valve Assembly 471750 Power Element Flow Valve 472330 as Valve Natural Gas 471601 Burner Tray Assembly 4719
13. Ave Sanford NC 27330 919 566 8000 Pool Products 10951 W Los Angeles Ave Moorpark CA 93021 805 523 2400 Because reliability matters most P N 472089 Rev E 4 19 05
14. DNIHIM ISNA WAYSAHL ONILWY dIN31 9 901 A009 DOMY 8L HLIM 34IM Q3AOtiddV YSIN AlddNS LSNW YITIVLSNI 030V1d38 39 LSNW ONIHIM AHOLOVA TWNIDIYO Al MS 34NsSIHd IV HIMOTY 10H4LNOD JLONIH HOJ IVANVA NOLLVTIVLSNI NOLLVHIdO 33S y ssgHd YILVM Sid SIF SLIT HOIH Rev E 4 19 05 P N 472089 Section IV Operation 21 Operation Instruction BASIC SYSTEM OPERATION 1 Start pump make sure the pump is running and is primed to close the water pressure switch and supply power to heater Be sure the pool and or spa is properly filled with water Follow the Lighting Operating instructions below MINIMAX NT LN HSI ELECTRONIC IGNITION LIGHTING OPERATION FOR YOUR SAFETY READ BEFORE LIGHTING AWARNING If you do not follow these instructions exactly a fire or explosion may result causing property damage personal injury or loss of life Do not attempt to light the heater if you suspect a gas leak Lighting the heater can result in a fire or explosion which can cause personal injury death and property damage A This appliance does not have a pilot It is equipped with If you cannot reach your gas supplier call the Fire an ignition device which automatically lights the burners Department Do not try to light the burners by hand f C Use only your hand to push in or turn the gas control knob B BEFORE OPERATING smell all around the appliance Never use tools Ifthe knob will not push in or turn by hand
15. H HOT SURFACE IGNITION N NATURAL GAS LN LOW NOx NT MINIMAX NT SERIES MODEL SIZE BTU INPUT in 1000 of BTU HR P N 472089 Rev E 4 19 05 Section II Introduction 5 Introduction MiniMax NT LN Series Pool and Spa Heaters Congratulations on your purchase of a MiniMax NT LN high performance heating system Proper installation and service of your new heating system and correct chemical maintenance of the water will ensure years enjoyment The MiniMax NT LN 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 LN also comes equipped with the Pentair multifunction temperature controller which shows at a glance the proper functioning of the heater All MiniMax NT LN heaters are designed with a direct ignition device HSI hot surface ignition which eliminates the need for a standing pilot The MiniMax NT LN requires an external power source 120 240 VAC 60 Hz to operate This instruction manual provides operating instructions installation and service information for the MiniMax NT LN high performance heater The information in this manual applies to all MiniMax NT LN 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 LN History and experience has shown that most heater
16. ION Pressure Relief Valve Installations Before operating the heater on a new installation turn BELOW POOL INSTALLATION 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 If a manual by pass is installed temporarily close it to insure that all air is purged from the heater If the heater is below water level the pressure switch must be adjusted This adjustment must be done by a qualified service technician See following CAUTION before installation ACAUTION VALVES BELOW OR ABOVE POOL INSTALLATION The water pressure switch is set in the factory at 17 PSI This setting is for a heater installed at pool level or within 3 above or 3 below If the heater is to be installed more that 3 above or 3 below the water pressure switch must be adjusted by a qualified service technician See page 22 Figure 21 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 siphoning ACAUTION Exercise care when installing chemical feeders so as to not allow back siphoning of chemical into the heater filters or pump When chemical feeders are FLOW SWITCH If the heater is instal
17. MiniMax NT LN Series Pool amp Spa Heaters OPERATION amp INSTALLATION MANUAL X Pentair Pool Products Because reliability matters most To Consumer Retain For Future Reference U S Patent Numbers 6 295 980 5 318 007 5 228 618 5 201 307 4 595 825 WARNING FOR YOUR SAFETY READ BEFORE OPERATING If you do not follow these instructions exactly a fire or explosion may result causing property damage personal injury or loss of life 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 Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this heater or other appliances WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance Do not touch any electrical switch do not use any phone in your building 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 For additional free copies of this manual call 800 831 7133 Pentair Water Pool and Spa Inc 1620 Hawkins Ave Sanford NC 27330 919 566 8000 10951 W Los Angeles Ave Moorpark CA 93021 805 523 2400 Rev E 4 19 05 P N 472089 Customer Service If you have questions about ordering Pentair Wat
18. NOCES seis A 5 Warranty Information aa 5 Code RUMANA 6 Consumerilnformation and Safely u u uuu ethanthacdtieieadias a a aaa A i 6 Section Ill Installation U u uuu 7 PECHOS n aaa S a Qu Sat aaah uapa natak AT qu qusa qikun chu a i saus 7 Plumbing Connections iii AA EATE TN NAN Na ll aa da 8 VAIVOS ia sets The TN a Mina en diss ni Sa aaa dint 8 Manual By Passa E a 8 Below PooliI stallall uu a a an a aaa HN hu kn a Tan 8 Water CONNECUONS list ln 9 10 Gas CONNEcHONS it tai iaa 11 SIMEONE NI 11 Gas Pipe SIZING tiraba on 12 Testing Gas Pressure Gas Pressure Requirements l L I an nanan 13 Indoor Venting General Requirements I nn 14 Indoor USA Outdoor Canada Installations 1 I n nn nanas 15 Combustion Air Supply vic da rail ori 16 VEA bid 16 Indoor Installations Venting Guidelines l I n n nn nnnnnnnnnnannssn 17 Outdoor Installations Venting Guidelines u uuu aa 18 Outdoor Vent ity aaron r lah oO qasa il 18 Electrical Connections i a na a u r dihanitani dinshadieil iaasennanion 19 Wiring Diagram NT LN with DDTC oiia Aaea ia Taa beaa ie 20 Section IV Operation zst sacia ca a o acc ca nics uuu u 21 Basic System Operation u y u ayu ta nl 21 ASI Hot Surface Ignition Lighting Oper tori ita in rr nr 21 odlo Control ataca rola laa alla 22 23 Digital Display Temperature Controller DDTC 1 Jl nn 2
19. S The DDTC board shown in Figure 26 is a digital temperature controller capable of controlling the pool spa or both to a minimum temperature of 65 F below 65 F display reads Off and a maximum of 104 F The DDTC board also functions as a system status indicator using LED lights and programmed error codes During normal operation the DDTC will display the current temperature of the water returning to the heater depending on which mode has been selected Pool or Spa This 1s accomplished by a thermister sensor on the inlet port of the water header of the heater and working in conjunction with the internal microprocessor controlling the operation of the heater Changing the desired pool or spa temperature is easily done by simply depressing the appropriate up or down arrow until the display reads the desired set point temperature For example set pool to 78 F and the spa to 104 F when releasing the up or down arrow the display will flash once then return to the current temperature At any time you wish to know the temperature setting of the pool or spa simply press the appropriate up or down arrow the display will flash once and display the set point temperature for three 3 seconds then flash once again and return to the current temperature P N 472089 Rev E 4 19 05 Section IV Operation 25 With the Power amp Pressure Switch LED ON the DDTC is in mode change and internally recalibr
20. TE CONTROL THE TWO WIRE REMOTE CONTROL SYSTEM is typically installed and connected to the heater for spa heating The two wire remote system 1s usually provided with a water temperature sensor that monitors the system temperature and turns the heater on or off in response to the temperature of the spa To heat a spa it should be connected to terminals J6 and J8 Pool heating remote control would require connecting to terminals J5 and J8 If the REMOTE mode is set at the front panel LED light the DDTC will respond to a contact closure by remote system and heater will operate until the remote system temperature setting 1s satisfied NOTE With this type of two wire remote with 1ts own temperature sensors and system control using the up arrows on the front of the DDTC hold down the up arrow until you reach the maximum setting of 104 F this allows the remote system thermostat to operate the heater at any set point below 104 F the heater thermostats then act as a secondary controller 1f water temperature reaches 104 F THE THREE WIRE REMOTE CONTROL SYSTEM will be connected to terminals J5 J6 amp J8 J8 is the common terminal If the heater is in the REMOTE mode the DDTC will monitor the terminals and respond to a contact closure between J5 amp J8 or J6 amp J8 A contact closure between J5 amp J8 will cause the DDTC to switch to the POOL setting and control the heater to the DDTC pool set point temperature A contact closure between
21. aligned before securing into place using the six 6 screws provided in the Vent Adaptor Kit METAL FLANGE SCREWS 6 Figure 11 Rev E 4 19 05 17 Installation Section lll ZL inBid UOITEUIUU 19 JUBA ay WO1 eme POUIEJUIELU aq PINOUS 1991 OL JO s9ueJeajo EJUOZIOU LUNUUILIUU 34u AJddns re E9IUBUISU 104 Buipiinq au 0 19 U1 Ajddns 1e yeolueydewW UOU JOJ ae PEJEDIPUI S DLEJESIJI e Ajddns aly sjeuejew Bune nsu sedoid pue s uiof swees pejeos Ajjusueujed UJIM adid juan Jem a Buis e osn feu eaoge Y lt Ajpeyuozoy y p lt 4 Bap 00 uey ssal MOJSJ 4 y E sune aunjeadua seb an UJIM seoueijdde you are p aeb 10 MOPUIM oop Aue wo eme S99UEJSIP BUIMOJJOJ SU PEJEDOJ aq snu III AJOBEJEJ ullA asn 104 lqelins aq jsnu e 10 9 uuo2 JUBA y SE JaJewelp owes ay aq snu e 40 SU9 X9 did JUIA opel AoqE y sea JE 9g snw o INJONJIS BU JO 1 U109 SPISUI UE JO Y UIYHM 29 LON SNUI sSNIPEJ Y OL e UIUJIM PEJEDOJ OYEJUI JE SPISINO Aue AoqE y sea JE aq snw S EMYJEM o1gnd anoqe y uey ss JOU aq jsnu SUO 8 8ISUI JEM SPIS 10 UONBUILI9 UIA BURUA uonoss ses deo J9UJESM JUSA pue EJO LUJOJS yoel Joo POOH JUSA em apis PeIsi ponosd e ue UJIM SJEUILUJ9 snu e JO S891NOS PEPUSLILIODEH ENAM uOIJeJjousd 100 y UBNOJUJ SIILUIUJ 4o01 e sn JSNLU po2 eooj Ag payiuled se Jo 004 y UBNOJUJ s
22. 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 F 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 Rev E 4 19 05 Section VI Maintenance 31 SPRING AND FALL OPERATION If the pool is being used occasionally do not turn the heater completely off Set the thermostat down to 65 F This 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 WINTER OPERATION ACAUTION Operating this heater continuously at water temperatures below 68 F will cause harmful condensation and will damage the heater and void the warranty If the heater has been drained for freezing condition do NOT turn ON until the system is circulating water Water trapped in the heat exchanger can result in freeze damage to the exchanger or headers Freeze damage is specifically not covered by the warranty 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
23. at 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 must be disconnected from the gas supply piping system during any pressure testing on that system greater that Y PSI 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 NOTE A manual main shut off valve must be installed externally to the heater DO NOT INSTALL THE GAS LINE UNION INSIDE THE HEATER CABINET THIS WILL VOID YOUR WARRANTY SEDIMENT TRAPS Install a sediment in front of the gas controls The sediment GAS VALVE trap shall be either a tee fitting AE with a capped nipple in the bottom outlet which can be removed for cleaning as illustrated in Figure 3 or a MANUAL other device recognized as an SHUT OFF effective sediment trap All ANE gas piping should be tested NIPPLE lt HEATER CABINET after installation in accordance CAP with local codes Figure 3 Rev E 4 19 05 P N 472089 Section II Installation 12 GAS PIPE SIZING Table 2 PIPE SIZING FOR GAS LINE CONNECTIONS MAXIMUM EGUIVALENT PIPE LENGTH Ft Natural Gas at
24. ating OR With only the Power LED ON and Pressure Switch LED OFF Circulation Pump is off and the Pressure Switch has turned the heater off Internal check during Power Up Water temperature below 58 F Water temperature above 14 F Heater in OFF state or when checking the Set temperature Thermostat set to OFF ERROR CODES See Trouble Shooting Section Figure 27 Rev E 4 19 05 P N 472089 Section IV Operation 26 SET UP The MiniMax NT LN Heater comes from the factory preset with a pool temperature setting of 78 F and a preset spa temperature of 100 F and in the off mode setting Once the power is turned on the DDTC board will do a self diagnostic internal check during this time the display will first read 888 then the display will switch to three dashes this process takes approximately ten 10 seconds The DDTC will then illuminate the Power LED and Off LED see Figure 27 1 Turn on the power to the heater the switch is on the bottom of the electrical junction box located inter nally on the right side of the cabinet The DDTC will now go through the self diagnostic s test as stated above 2 Turn on the circulating system pump and make sure that adequate water is being delivered to the heater The PRESSURE SW LED will now illuminate 3 If you are using the heater with a remote control system open the right door of the heater to access the rear porti
25. d with two permanent air supply openings one within 12 inches of the ceiling the other within 12 inches of the floor These openings shall directly or through duct connect to outdoor air Pentair Water Pool and Spa Inc does not recommend indoor installations that do not provide combustion air from outside the building 16 Air Supply Requirements Guide for MiniMax NT LN Heaters Net Free open Area for Each Opening Square Inches Heater Ducted from Direct from Size Outside Outside Area indicated is for one of two openings one at floor level and one at the ceiling NOTE If using louvered type or screen type openings check with Louver Screen Manufacturers to correct for the Louver Screen resistance Table 10 ACAUTION Chemicals should not be stored near the heater installation Combustion air can be contaminated by corrosive chemical fumes which can void the warranty VENT ADAPTORS FITS ALL MODELS The proper vent adaptor must be installed on the heater as shown below in Figure 9 Product No Vent Adaptor 9 L 9 P N 472089 1 Remove the six 6 retaining screws from the old exhaust grill and discard the screws gasket and exhaust grill as shown in Figure 10 EXHAUST GRILL SCREWS 6 Figure 10 2 Install the Vent Adaptor as shown in Figure 11 Make sure the holes in the gasket metal flange of the main vent assembly and heater cover are
26. damage is caused by improper installation practices IMPORTANT NOTICES For the installer and operator of the MiniMax NT LN 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 Water Pool and Spa Inc at 800 831 7133 WARRANTY INFORMATION The MiniMax NT LN pool heater is sold with a limited factory warranty Specific details are described on the warranty registration card which is included with the product Return the warranty registration card after filling in the serial number from the rating plate inside the heater Pentair Water Pool and Spa 5 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 These heaters are designed for the heating of swimming pools and spas and should never be used as space heating boilers general purpose water heaters in non stationary installations or for the heating of salt water The manufacturer s warranty may be void if for any reason the heater is improperly installed and or operated Be sure to follow the instruct
27. e BEIGE common connector and plug it into the BLUE common connector When connecting the power supply to the Line Terminal Block inside the junction box follow the polarity as shown below Connecting to 120 VAC make sure that you connect the wire to the terminal L the neutral wire is connected to the neutral terminal N and the ground is connected to the ground terminal GND see below Figure 17 If any of the original wiring supplied with this heater must be replaced installer must supply No 18 AWG 600V 105 C U L approved AWM low energy stranded copper wire or it s equivalent Thermal fuse wiring must be replaced with 18 AWG 600V 150 C temp rating ACAUTION The installation must conform with local codes or in the absence of local codes with the National Fuel Gas Code ANSI Z223 1 NFPA 54 and or CSA B149 1 Natural Gas and Propane Installation Codes If an external electrical source is utilized the heater when installed must be electrically grounded and bonded in accordance with local codes or in the absence of local codes in the USA with the National Electrical Code ANSI NFPA 7 in Canada with Canadian Electric Code CSA C22 1 Always use crimp type connectors when connecting two wires TRANSFORMER CONNECTOR BLUE j CONNECTOR MENI BEIGE COMMON CONNECTOR RED 240V CONNECTOR TERMINAL BLOCK FORAC INPUT A 120 240 VOLT SINGLE You need to open the right oh d
28. ecomes too high over alkaline it has these effects 1 Greatly lowers the ability of chlorine to destroy bacteria and algae 2 Water becomes cloudy 3 There is more danger of scale formation on the plaster or in the heat exchanger tubing 4 Filter elements 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 tubes 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 13 pH Control Chart Add Soda Ash or Marginal Ideal Marginal Add Acid Sodium Bicarbonate ALKALINITY High or 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 1
29. ed C Bad control check voltage at ignitor 4 lgnitor on no valve action A Valve coil open B Open valve wire C Bad control check voltage 5 Flame okay during A Bad flame sensor Try For Ignition TFI B Bad wires no flame sense after TFI C Poor ground at burner D Poor flame check flame current Rev E 4 19 05 P N 472089 Section VI Maintenance Maintenance Instruction 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 Make sure there are no obstructions in the flow of combustion and ventilation 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 Inspect the heat exchanger for soot Clean as necessary 4 Remove burner tray and clean burners and main burner orifices 5 Keep the heater area clean and free from combustibles and flammable liquids 6 Check wire ends and wire connections They should be clean and tight 7 Check the gas pressure supply and manifold as described in this manual Figure 28 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 sett
30. elated components Some states require installation and repair by licensed personnel If this applies in your state be sure your contractor bears the appropriate license See Figure 1 for Outdoor and Indoor Installations DIMENSIONS IN INCHES MODEL A DIM 200 21 63 250 24 63 300 27 63 400 34 13 2 in SOCKET 05 INDOOR INSTALLATION VENT ADAPTOR See Indoor Venting Instructions r 2 00 T A Of em in SOCKET L 24 05 INDOOR VENT ADAPTOR P N 460506 4 in Kit P N 460507 Sin Kit Figure 1 Rev E 4 19 05 P N 472089 Section II Installation 8 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 See Figure 2 Max GPM Figure 2 cael NE PLUMBING CONNECTIONS 300 The MiniMax NT LN heater has the unique capability of 400 direct schedule 40 PVC plumbing connections A set of bulkhead fittings is included with the MiniMax NT LN to Do not exceed the maximum recommended a a flow rate for the connecting piping insure conformity with Pentair s recommended PVC plumbing procedure Other plumbing connections can be Table 1 used See Figure 2 for plumbing connections See page 30 for AC AUT
31. er Pool and Spa replacement parts and pool products please use the following contact information Customer Service 8 A M to 5 P M Pacific Time Phone 800 831 7133 press 3 in voice mail Fax 800 284 4151 Technical Support for Pentair Water Pool and Spa Inc Sanford North Carolina 8 A M to 5 P M Eastern Time Phone 919 566 8000 Fax 919 76 0562 Moorpark California 8 A M to 5 P M Pacific Time Phone 805 523 2400 Ext 6502 Fax 805 530 0194 Web site visit www pentairpool com to find information about Pentair Water Pool and Spa Inc O 2005 Pentair Water Pool and Spa Inc 1620 Hawkins Ave Sanford NC 27330 919 556 8000 10951 West Los Angeles Ave Moorpark CA 93021 805 523 2400 All rights reserved Information in this document is subject to change without notice Trademarks and Disclaimers MiniMax NT LN and the Pentair Pool Products logo are registered trademarks of Pentair Water Pool and Spa Inc Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products Pentair Water Pool and Spa Inc disclaims any proprietary interest in trademarks and trade names other than its own P N 472089 Rev E 4 19 05 Table of Contents Section I Heater Identification Information 4 Section Il Introduction u uuu u 5 Important
32. erature sensing probe by passing the wires through the hole provided on the left side of the brace panel Route wires through the support bracket 10 Reconnect all the high limit wires and the pressure switch wiring routing the wires through the same hole as the thermostat sensor wires 11 Pump and bleed system to check the head for leaks 12 Reinstall the two large inspection plates on the appropriate side Remember The inlet and outlet markings on the header are still correct Do not plumb the heater backwards Rev E 4 19 05 Section II Installation 11 GAS CONNECTIONS GAS LINE INSTALLATIONS Before installing the gas line be sure to check which gas the heater has been designed to burn This is impor tant because different types of gas reguire different gas pipe sizes The rating plate on the heater will indicate which gas the heater is designed to burn The tables shown on page 12 show which size pipe is reguired 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 th
33. es are closed WATER PRESSURE SWITCH The water pressure switch see Figure 21 closes when there is a sufficient flow of water to the heat exchanger to safely operate the heater The switch has been preset by the Factory at 1 2 PSI for operation NOTE See Below Pool Level Installation instructions on page 8 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 1f this is the case the water pressure switch must be reset by a qualified service technician 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 water pressure switch may have to be replaced with a flow switch THERMAL FUSE This is a single use switch mounted on combustion chamber jacket divider inner front panel The fuse see Figure 22 is activated by excessive temperature due to abnormal operating conditions Upon detection of excessive heat within the inner front panel the fuse will open the safety circuit causing shutdown of the heater LOW GAS PRESSURE SWITCH The MiniMax NT LN model heater uses a low gas supply pressure switch see Figure 23 ahead of the gas valve to prevent operation of the heater when the gas supply pressure is below the minimum reguired for proper operation of the burners The switch is factory set In the event that the switch does not close
34. essed y UJIUM ye jurod ay uey J9UBIU y sea JE puajxa snu SUOIJEJ EJSUI uo le11 u d JOO 10 JUSA jeu liy 80404 apei6 anoqe ULL Jud sen A9UUIUJ N POOH IUS Y OLUEU auon Y OL uyy yoalqo Aue anoqe pZ 1SLoJ JE POJEUILUJ9 uan SANITAGIND SNILN3A LN XVININIW SNOILVTIVLSNI HOOGNI P N 472089 Rev E 4 19 05 Section II Installation 18 OUTDOOR INSTALLATION Outdoor Shelter Installation in Canada see page 15 For outdoor installation with an exhaust grill 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 IMPORTANT In an outdoor installation it is important to ensure water is diverted from overhanging eves with a proper gutter drainage system The heater must be set on a level foundation for proper drainage Under certain conditions heavy rains or unusually high winds it may be necessary to install an outdoors vent In this situation use Outdoor Vent Kit P N 460424 see below e This unit shall not be operated outdoors at temperatures below 20 F OUTDOOR INSTALLATION VENTING GUIDELINES SIDE VIEW Air Inlet 4 ft Exhaust Grill a Vent aj Building Vent Termination Must be at least 3 ft above any forced a
35. ground structures where flammable liquids may be stored must have the heater elevated 18 inches from the floor The following minimum clearances from combustible materials must be provided Ha Gu ad INCHES INCHES WATER PIPING BLANK FRONT To ceiling or roof Table 9 Rev E 4 19 05 15 P P Vent Cap and Chimney or Gas Vent Riser Furnished by Installer 3 Outlet Air 3 Opening Optional Side Wall Vent a Inlet Air Opening Heater Figure 6 AH Vent Cap and Chimney or Gas Vent Riser Furnished by Installer E Outlet Air Opening 1 Optional Side Wall Vent 5 E Inlet Air Opening Heater Figure 7 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 8 PIN 472089 Section II Installation COMBUSTION AIR SUPPLY For indoor installation the heater location must provide sufficient air supply for proper combustion and ventilation of the surrounding area The requirements for the air supply specify that the room in which a heater is installed should be provide
36. has occurred or when the heater is first firing The problem must be investigated by the technician prior to attempts to fire the heater again TEMPERATURE SETTING The heater comes factory set at 78 F for the pool mode and 100 F for the spa mode using the up and down arrows you can set the thermostats to a minimum temperature of 65 F or a maximum of 104 F If you desire to heat only one body of water the thermostat is capable of an off mode As an example 1f you only wish to heat the spa and not the pool simple depress and hold the pool down arrow and the thermostat will lower its setting to 65 F then go to an off mode If there 1s a remote system connected to the heater please see the special thermostat setting features under Heating Mode Selection amp Remote mode HEATING MODE SELECTION 1 Off Mode The heater will not come on NOTE The Off display on the Digital Display Temperature Controller does not mean that the heater is off It only states that the pool or spa thermostat has been turned off 2 Spa Mode The heater will operate and heat the spa to the desired temperature 3 Pool Mode The heater will operate and heat the pool to the desired temperature 4 Remote Mode The DDTC is compatible with two and three wire remote control systems In order to operate by a remote control system the REMOTE mode must be selected on the front panel When the REMOTE mode is selected the REMOTE LED will light up REMO
37. ing to 78 F or lower This is accepted as being the most healthy temperature for swimming by the American Red Cross 3 Use an accurate thermometer When the proper maximum thermostat settings have been determined tighten the thermostat knob stopper P N 472089 ACAUTION REMOVE THE FLOW VALVE ASSEMBLY WHEN DRILLING THE HOLE TO INSTALL A PRV OTHERWISE YOU WILL DRILL INTO THE VALVE ASSEMBLY PRESSURE RELIEF VALVE In some installations a pressure relief valve PRV is required on the MiniMax NT LN Series To install a PRV remove the access doors remove Flow Valve assembly then carefully drill a 3 8 in hole in center of 3 4 in NPT port on main header being a RELIEF om k el VALVE FOR PRV Z V s INSTALLATION v DRILL THRU lt THE NPT PORT KZ careful to drill only N REMOVE FLOW VALVE y BEFORE DRILLING through wall at THE NPT PORT bottom of 3 4 in NPT port and no Figure 29 deeper now thread in the 3 4 in NPT PRV NOTE A S M E version varies slightly It is of bronze construction and is supplied with the A S M E Section IV pressure relief valve pre installed at factory RELIEF VALVE TO WINTERIZE OPEN DRAIN VALVE Test the relief valve at least once a year by lifting up lever A S M E VERSION 5 Set time clock to start circulation system no earlier than daybreak The swimming pool loses less heat at this time 6 For pools that
38. ions set forth in this manual ACAUTION OPERATING THIS HEATER CONTINUOUSLY AT WATER TEMPERATURE BELOW 68 F WILL CAUSE HARMFUL CONDENSATION AND WILL DAMAGE THE HEATER AND VOID THE WARRANTY Do not use the heater to protect pools or spas from freezing if the final maintenance temperature desired is below 68 F as this will cause condensation related problems Rev E 4 19 05 P N 472089 Section II Introduction 6 CODE REGUIREMENTS The installation must conform with local codes or in the absence of local codes with the National Fuel Gas Code ANSI Z223 1 NFPA 54 and or CSA B149 1 Natural Gas and Propane Installation Codes The heater when installed must be electrically grounded and bonded in accordance with local codes or in the absence of local codes in the USA with the National Electrical Code ANSI NFPA 7 in Canada with Canadian Electric Code CSA C22 1 member A CERTIFIED CONSUMER INFORMATION AND SAFETY AWARNING The U S Consumer Product Safety Commission warns that elevated water temperature can be hazardous See below for water temperature guidelines before setting temperature 1 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 Prolonged immersion in hot water can induce hyperthermia 2 Drinking of alcoholic beverages before or during spa or hot tub use can cau
39. ir inlet located within a 10 ft radius Heater side view ARAHAL IRA A A ADAP AA AA REA MM Must be located 4 feet away from the building wall Figure 13 openings and at the following distances away from any door window or gravity air inlet gt 41t below gt 4ft horizontally OUTDOOR VENT KIT 1 Remove the six 6 retaining screws from the old exhaust grill and discard the screws gasket and exhaust grill as shown in Figure 14 2 Install the Outdoor Vent Kit P N 460424 as shown in Figure 15 Make sure the holes in the gasket metal flange of the main vent assembly and heater cover are aligned before securing into place using the six 6 screws provided in the Outdoor Vent Kit EXHAUST GRILL METAL FLANGE SCREWS 6 SCREWS 6 Figure 14 lt LA Figure 15 ACAUTION If installing the heater next to or near an air conditioning unit or a heat pump allow a minimum of 36 in between the air conditioning unit and the heater P N 472089 Rev E 4 19 05 Section II Installation 19 ELECTRICAL CONNECTIONS Electrical Rating 60 Hz 120 240 Volts AC single phase ACAUTION This heater is designed to operate at 120 or 240 VAC It is not recommended to be connected to OR operate on a 208 VAC NOTE The MiniMax NT LN heater is prewired for 240 volt AC connection using the RED connector and the BEIGE common connector see below Figure 16 For 120 volt AC supply remove th
40. led more the 6 above the pool or more than 10 below the pool level you will be beyond the limits of the pressure switch and a flow switch must be installed Locate and install the flow switch externally on the outlet piping from the heater as close as possible to the heater Connect the flow switch wires in place of the water pressure switch wires installed in the circulation of the piping system make sure the feeder outlet line is down stream of the heater and is equipped with a positive seal noncorrosive Check Valve P N R172288 between the feeder and heater P N 472089 Rev E 4 19 05 Section II Installation WATER CONNECTIONS Reversing Headers Reversible Inlet Outlet Connection The MiniMax NT LN Series 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 reguired Phillips Screw Driver 9 16 in Socket and Wrench 1 2 in amp 9 16 in Open Wrench 1 Remove the right and left large access doors It is not necessary to remove the top of the heater to gain access to the headers TT p 2 Disconnect all wires from the high limit switches except the short jumper wire Rev E 4 19 05 NOTE Do NOT remove the high limit and pressure switches or the thermistor from the front header during the reversing procedure as
41. n module performs an inter purge delay approximately 15 seconds before attempting another TFI cycle The module will attempt 2 additional TFI s cycles before locking out The gas valve will be turned off immediately The combustion blower will be turned off following 45 seconds post purge period The module will automatically reset after one hour if the thermostat is still calling for heat and attempt a new TFI cycle 3 FLAME FAILURE RE IGNITION If the established flame signal is lost while the burner is operating the control will respond within 08 second The gas valve is de energized and the control Figure 25 starts a new ignition sequence in an attempt to relight the burner The ignition attempt will be repeated 3 times If the burner does not relight the control will go into lockout as previously described in the Failure to Light the Burner Lock Out If flame is reestablished normal operation resumes Rev E 4 19 05 P N 472089 Section IV Operation 24 DIGITAL DISPLAY TEMPERATURE CONTROLLER DDTC PRESSURE SW SYSTEM INDICATOR LIGHTS THERMOSTAT HEATING m1 SERVICE 9 t a Pentair Pool Products Because reliability matters most REMOTE lt POOL Figure 26 i TEMP UP TEMP DOWN REMOTE BUTTON POOL BUTTON SPA BUTTON OFF BUTTON SPA AND POOL TEMPERATURE SET BUTTON
42. on of the DDTC Locate the three terminals marked Pool J5 Spa J6 and Com J8 If the remote system is a three wire remote unit connect the pool lead to the pool terminal J5 connect the spa lead to the spa J6 terminal and connect the common wire to the com terminal J8 If the remote system 1s a two wire remote the remote system will be used to turn the heater on for a selected body of water Pool or Spa select which application you are working with and connect one wire to the common terminal J8 and the other wire to either Pool J5 or Spa J6 Close and latch the door LED INDICATORS There are nine lights that can be seen from the front of the control panel five are system indicators and four are mode indicators which helps you understand the operation of the heater see Figure 26 If something should go wrong the lights will aid in troubleshooting the problem An additional four lights can be seen after opening the control panel These four lights are diagnostic indicators for the service technician to troubleshoot the system On the right front of the DDTC board there are four Buttons and corresponding LED lights see Figure 26 Using the buttons allows you to select one of the four modes and the lights indicate which operational mode that the heater is in Off Spa mode Pool mode or Remote mode If the heater is not connected to a remote system then the remote mode will not be used The foll
43. oor then remove the control panel cover for servicing the Line Terminal Block as shown in Figures 16 8 17 see item 40 in the exploded view on page 33 Figure 16 LINE TERMINAL BLOCK GREEN WIRE GROUND CONNECTION INTERNAL NEUTRAL WHITE 120 VAG FACTORY WIRES WHITE WIRE LINE 1 FOR 240 VAC BLACK WIRE HOT BLACK 120 VAC LINE 2 FOR 240 VAC Figure 17 Rev E 4 19 05 P N 472089 20 Installation WIRING DIAGRAM Section lll NT LN W DDTC 9NV19 13 HION 39V8 1 ZLIHWM MOVIE 9Nv19 13 39n08 JOVHL 3 LIHM M qat ONV18 SLIHM 3NNVP MOTIZA 39N0H Gay 137010 31d8Nd ONYHO JONVEO SIHD AVHS L83N N3389 NOYEVIN NMOHY naa ama HION MOVIE lava nq Hn41noo 40100 341M 343H SHIM INNOHO HOVLIV 9 Layover 30IS 3H1 NO OVA Oe HO OVA O21 SNISTAO S34930 OS A009 DMV 8L VYHNLVHJdNAL 30 3113H93 ANN O3AV 339WIdW38 38 13 1100 3NOINW83HL 318 SN3 NG 3N0I4 19313 NOLLYTIY LSNI 1 J4NLVYHJdWNAL aq 3113H93 0 SNISTAO S34930 SO A009 OMV 81 DJAV SIANOYAAV WSO 1N SYTAVO SAG YENDO YA LIOG HNALVTILSNIT 33OV1dNWat 34 13 1100 ANISN G ATWNIDIHO ANOIHLOZTA NOILYTIV LSNI 1 IS THERMISTER S3 N9I zl Ove NOI H OCL NOI AW 5 lt MW AAWA SVO Ja o gt 9 o S A0pZ ZLd OVA Ove HOS dauIMaud SI HILVIH JHL JON A ECERECEE AD Adz etd 81 eunbi4 ONILVH dWAL 9 051 A009 OMY 8L HLIM 039V1d38 38 LSNW
44. ow Voltage a High Temperature Limit Thermal Fuse Open Table 11 P N 472089 Rev E 4 19 05 Section V Troubleshooting 29 TROUBLESHOOTING GENERAL Possible Cause Heater will not come on Check if electrical connections are Automatic ignition system fails 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 Turn switch to ON Heater Short Cycling Rapid On and Off Operation Insufficient water flow 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 SERVICE CHECKS IGNITION MODULE Symptom 1 Dead A Miswired B Transformer bad C Fuse Circuit breaker bad D Bad control 2 Thermostat on no ignition A Miswired B Bad thermostat no voltage at terminal 3 Valve on no ignition A Defective ignitor B Miswir
45. owing are descriptions of the five system indicators POWER The light is on at all times in any switch position indicating 24 VAC power is being supplied to the control circuit If 1t fails to light no other light will be on Possible causes are 1 External power to the heater is disconnected check service panel circuit breaker or fuses 2 Transformer has failed e PRESSURE SW WATER PRESSURE SWITCH This light is on when Spa Pool Selector switch is on indicates the circulating pump is running properly If pressure light fails to light the pump may have lost its prime or water flow may be restricted by an inadvertently closed valve or clogged filter or pump basket If you have determined that there is no water flow restriction to the heater you should call a qualified technician THERMOSTAT This light is on when the thermostat contacts close signaled by the water temperature falling below the set point calling for the heater to fire to maintain the desired water temperature P N 472089 Rev E 4 19 05 Section IV Operation 27 HEATING The heating light is on any time the thermostat has signaled a call for heat which initializes the ignition safety circuit the light comes on indicating successful firing of the main burners and stays on until the pool spa reach the water temperature setting SERVICE The service light is off during normal operation of heater The light only comes on if a problem with a control
46. perature less than 400 F The total length of the horizontal run must not exceed the length that is listed below in the tables NOTE The allowable vent runs for each vent pipe diameter are different and can not be exceeded 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 using 90 degree and 45 degree elbows The MiniMax NT LN is a Category III appliance and is an induced draft pool and spa heater which uses positive pressure to push flue gases through the vent pipe to the outside This reguires a completely sealed vent system single wall vent pipe with sealed seams and joints 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 ofa sealed seam construction such as those listed for use with Category III Appliances and for operating temperatures less than 400 F The use of listed thimbles roof jacks and or side vent terminals are reguired 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 heater can be fo
47. phere through a vent pipe which is connected to the stack adaptor A vent pipe extension of the same size must be connected to the vent 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 6 7 and 12 The vent should terminate with an approved vent cap weather cap for protection against rain or blockage by snow Insulated 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 with adequate ventilation and on a leveled floor where leakage from heat exchanger or water connections will not result in damage to 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 It is recommended to install the heater on fire resistance slabs Do not install the heater directly on a combustible wood floor without placing a non combustible material between the floor and the heater Heaters must NEVER be installed directly on carpeting Installations in basements garages or under
48. sally 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 bacteria algae and other oxidizable 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 It is 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 12 pH Chart Neutral 7 8 9 10 Table 12 Strongly Acid 012 3 4 5 6 Strongly Alkaline 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 P N 472089 32 RULE 7 4 to 7 6 is a desirable pH range It is essential to maintain correct pH see Table 13 If PH b
49. se drowsiness which could lead to unconsciousness and subsequently result in drowning U 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 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 heater Do not use this heater if any part has been under water Immediately call a gualified service technician to inspect the heater and to replace any part of control system and gas control which has been under water P N 472089 Rev E 4 19 05 Section III Installation 7 Installation Instructions SPECIFICATIONS These installation instructions are designed for use by qualified personnel only trained especially for installation of this type of heating equipment and r
50. und on page 16 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 LN heater is suitable for through the wall venting see table and dimensions below Feet Recommended sources for Side wall vent hood terminals include The Field Controls Co 2308 Airport Road Kingston 4 inch Vent Pipe Number of Elbows Table 6 5 inch Vent Pipe 5 inch Vent Pipe Elbows Vent Run Elbows Vent Run oo a gt en 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 THROUGH WALL VENT KITS FOR HEATERS 471532 6 in Dia 6 5 16 in 12 5 8 in 10 5 8 in 471543 12 5 8 in 10 5 8 in Table 8 Part Figure 5 P N 472089 C Table 7 e F E Lg kami Rev E 4 19 05 Section II Installation INDOOR INSTALLATION USA ONLY OUTDOOR SHELTER INSTALLATION CANADA See page 16 for Vent Adaptors All products of combustion and vent gases must be completely removed to the outside atmos
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