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Pentair MiniMax NT LN - page 1
Rev . E 4-19-05 P/N 472089 1 1 MiniMax NT ® LN Series Pool & Spa Heaters OPERA TION & INST ALLA TION MANUAL W ARNING U.S. Patent Numbers 6,295,980 5,318,007 - 5,228,618 5,201,307 - 4,595,825 Pentair Water Pool and Spa, Inc. 1620 Hawkins Ave., Sanford, NC 27330 • (919) 566-8000 10951 W. Los Angeles Ave., Moorpark, CA 93021 • (805) 523-2 ...
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Pentair MiniMax NT LN - page 2
P/N 472089 Rev . E 4-19-05 2 Customer Service If you have questions about ordering Pentair W ater Pool and Spa replacement parts, and pool products, please use the following contact information. Customer Service (8 A.M. to 5 P .M. Pacific T ime) Phone: (800) 831-7133 (press 3 in voice mail) Fax: (800) 284-4151 T echnical Support for Pentair W ater ...
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Pentair MiniMax NT LN - page 3
Rev . E 4-19-05 P/N 472089 3 T able of Contents Section I. Heater Identification Information ........................................................... 4 Section II. Introduction ............................................................................................ 5 Important N otices ........................................................ ...
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Pentair MiniMax NT LN - page 4
P/N 472089 Rev . E 4-19-05 4 T o 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 : Heate ...
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Pentair MiniMax NT LN - page 5
Rev . E 4-19-05 P/N 472089 5 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, ef ficient, ...
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Pentair MiniMax NT LN - page 6
P/N 472089 Rev . E 4-19-05 6 CONSUMER INFORMA TION AND SAFETY W ARNING 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 ...
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Pentair MiniMax NT LN - page 7
Rev . E 4-19-05 P/N 472089 7 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 ...
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Pentair MiniMax NT LN - page 8
P/N 472089 Rev . E 4-19-05 8 PUMP FILTER POOL HEATER CHECK VALVE MANUAL BY-PASS TO POOL GATE VALVE CHECK VALVE FROM POOL Figure 2. PLUMBING CONNECTIONS The MiniMax NT LN heater has the unique capability of direct schedule 40 PVC plumbing connections. A set of bulkhead fittings is included with the MiniMax NT LN to insure conformity with Pentair ’ ...
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Pentair MiniMax NT LN - page 9
Rev . E 4-19-05 P/N 472089 9 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 r emoving the heat exchanger . Reversing W ater Connections T ools r equir ed: Phil ...
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Pentair MiniMax NT LN - page 10
P/N 472089 Rev . E 4-19-05 10 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 ...
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Pentair MiniMax NT LN - page 11
Rev . E 4-19-05 P/N 472089 11 GAS CONNECTIONS GAS LINE INST ALLA TIONS 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 require dif ferent gas pipe sizes. The rating plate on the heater will indicate which gas the heater is designed to burn. The table ...
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Pentair MiniMax NT LN - page 12
P/N 472089 Rev . E 4-19-05 12 GAS PIPE SIZING T able 2. “RESIDENTIAL” NA TURAL GAS 2 ST AGE REGULA TION In many Natural gas line installations, the gas supplier and/or installer may utilize a two stage r egulation pr ocess wher e by at the str eets main gas supply they will install the first stage gas r egulator , which would be at a higher pr ...
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Pentair MiniMax NT LN - page 13
Rev . E 4-19-05 P/N 472089 13 TESTING GAS PRESSURE OFF ON Regulator Adjustment Cap 1/8" NPT Plug (Manifold Press) 1/8" NPT Plug (Inlet Press) Figure 4. e r u s s e r P s a Gl e d o M l a r u t a N s e h c n I . C . W t e l n I m u m i x a M N L0 1 t e l n I m u m i n i M N L* 5 d l o f i n a M N L4 : E T O N e l i h w n e k a t e b t s u ...
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Pentair MiniMax NT LN - page 14
P/N 472089 Rev . E 4-19-05 14 INDOOR VENTING — General Requirements The vent pipe must be the same size or larger . The MiniMax NT LN heaters are capable of a 360-degree dischar ge rotation and operate with a positive vent static pressure and with a vent gas tem perature less than 400° F . The total length of the horizontal run must not exceed t ...
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Pentair MiniMax NT LN - page 15
Rev . E 4-19-05 P/N 472089 15 OUTDOOR SHEL TER INST ALLA TION (CANADA) See page 16 for V ent Adaptors All 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 vent adaptor and extended a ...
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Pentair MiniMax NT LN - page 16
P/N 472089 Rev . E 4-19-05 16 . o N t c u d o r P. a i D t n e V 6 0 5 0 6 4. n i 4 7 0 5 0 6 4. n i 5 CAUTION 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 heat ...
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Pentair MiniMax NT LN - page 17
Rev . E 4-19-05 P/N 472089 17 INDOOR INST ALLA TIONS MINIMAX NT VENTING GUIDELINES 4' 7' 4' 4' Force Air Inlet V ent Hood W alkwa y 3' 1' min. 1' min. 1' min. abov e grade V ent Hood V ent Hood must e xtend at least 3 ft. higher than the point at which it passes through the roof , or as permitted by local cod ...
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Pentair MiniMax NT LN - page 18
P/N 472089 Rev . E 4-19-05 18 OUTDOOR INST ALLA TION 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 mu st be open on three sides. IMPOR ...
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Pentair MiniMax NT LN - page 19
Rev . E 4-19-05 P/N 472089 19 Y ou need to open the right door then remove the control panel cover for servicing the Line T erminal Block as shown in Figures 16 & 17, (see item 40 in the exploded view on page 33) . ELECTRICAL CONNECTIONS Electrical Rating 60 Hz 120 / 240 V olts AC, single phase CAUTION This heater is designed to operate at 120 ...
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Pentair MiniMax NT LN - page 20
P/N 472089 Rev . E 4-19-05 20 WIRING DIAGRAM–NT LN/W DDTC Section III. Installation Figure 18. WATER PRESS MiniMax NT LN W/DDTC Wiring Diagram FAN J2 GY 18 AWG, 600V, 150˚C TEMP. RATING. IF ORIGINAL FACTORY WIRING MUST BE REPLACED, WITH 18 AWG, 600V, 105˚C TEMP. RATING. INSTALLER MUST SUPPLY UL/CSA APPROVED WIRE THERMAL FUSE WIRING MUST BE REPL ...
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Pentair MiniMax NT LN - page 21
Rev . E 4-19-05 P/N 472089 21 BASIC SYSTEM OPERA TION 1. Start pump, make sure the pump is running and is primed, to close the water pr essure switch and supply power to heater . Be sure the pool and/or spa is properly filled with water . Follow the Lighting/Operating instructions below . Section IV . Operation Operation Instruction FOR YOUR SAFETY ...
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Pentair MiniMax NT LN - page 22
P/N 472089 Rev . E 4-19-05 22 SAFETY CONTROLS V ACUUM AIR PRESSURE (F AN) 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 conn ...
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Pentair MiniMax NT LN - page 23
Rev . E 4-19-05 P/N 472089 23 SAFETY CONTROLS, (cont’d.) HIGH LIMITS A “High Limit”, is 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 inle ...
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Pentair MiniMax NT LN - page 24
P/N 472089 Rev . E 4-19-05 24 DIGIT AL DISPLA Y TEMPERA TURE CONTROLLER (DDTC) REMOTE POOL SPA OFF POWER PRESSURE SW THERMOSTAT HEATING SERVICE REMO TE BUTT ON POOL BUTT ON SP A BUTT ON OFF BUTT ON TEMP . UP TEMP . DO WN SP A AND POOL TEMPERA TURE SET BUTT ONS SYSTEM INDICA T OR LIGHTS PRESS ANY ARROW ONCE TO CHECK SET TEMPERATURE TEMPERATURE SETTI ...
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Pentair MiniMax NT LN - page 25
Rev . E 4-19-05 P/N 472089 25 Section IV . Operation Figure 27. ...
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Pentair MiniMax NT LN - page 26
P/N 472089 Rev . E 4-19-05 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 of f 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 ? ...
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Pentair MiniMax NT LN - page 27
Rev . E 4-19-05 P/N 472089 27 • HEA TING 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. • SER VICE The service light is off durin ...
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Pentair MiniMax NT LN - page 28
P/N 472089 Rev . E 4-19-05 28 Section V . T roubleshooting T roubleshooting Instruction e d o C r o r r En o i t p i r c s e D r o r r E 1 0 Ee g a t l o V w o L m e t s y S 2 0 Et i m i L e r u t a r e p m e T h g i H 3 0 En e p O e s u F l a m r e h T 4 0 Ee r u l i a F n a F 5 0 Ee r u l i a F e m a l F / n o i t i n g I 6 0 Ee r u l i a F e l u ...
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Pentair MiniMax NT LN - page 29
Rev . E 4-19-05 P/N 472089 29 Possible Cause Remedy 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 Defectiv ...
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Pentair MiniMax NT LN - page 30
P/N 472089 Rev . E 4-19-05 30 ENERGY SA VING TIPS 1. If possible, 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 swim ...
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Pentair MiniMax NT LN - page 31
Rev . E 4-19-05 P/N 472089 31 SPRING AND FALL OPERA TION If the pool is being used occasionally , do not turn the heater completely of f. 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 OPERA TION CAUTION ...
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Pentair MiniMax NT LN - page 32
P/N 472089 Rev . E 4-19-05 32 RULE: 7.4 to 7.6 is a desirable pH range. It is essential to maintain correct pH, see T able 13 . If pH becomes too high (over alkaline), it has these effects: 1. Greatly lowers the ability of chlorine to destroy bacteria and algae. 2. W ater becomes cloudy . 3. There is more danger of scale formation on the plaster or ...
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Pentair MiniMax NT LN - page 33
Rev . E 4-19-05 P/N 472089 33 REPLACEMENT P ARTS — NT LN w/DDTC ...
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Pentair MiniMax NT LN - page 34
P/N 472089 Rev . E 4-19-05 34 ...
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Pentair MiniMax NT LN - page 35
Rev . E 4-19-05 P/N 472089 35 NOTES ...
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Pentair MiniMax NT LN - page 36
P/N 472089 Rev . E 4-19-05 36 40 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 SAVE THESE INSTRUCTIONS ...
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