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Pentair 250 - page 1
Rev . C 1 1-1-01 P/N 471593 1 1 FOR YOUR SAFETY - READ BEFORE OPERA TING W arning: 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. Do not store or use gasoline or other flammable vapors and liqu ...
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Pentair 250 - page 2
P/N 471593 Rev . C 1 1-1-01 2 T able of Contents Introduction ............................................................................................................... 3 Important N otices .............................................................................................................. ............................................ ...
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Pentair 250 - page 3
Rev . C 1 1-1-01 P/N 471593 3 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, ef ...
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Pentair 250 - page 4
P/N 471593 Rev . C 1 1-1-01 4 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 NOx 200, 250, 300, and 400 natural gas models. It is very important that the owner/installer read and ...
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Pentair 250 - page 5
Rev . C 1 1-1-01 P/N 471593 5 Operation (Lighting) FOR YOUR SAFETY : READ BEFORE LIGHTING A. This heater is equipped with an ignition device which automatically lights the main burners. Do not try to light the burners by hand. B. BEFORE OPERA TING, smell all around the heater area for gas. Be sure to smell next to the floor because some gas is heav ...
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Pentair 250 - page 6
P/N 471593 Rev . C 1 1-1-01 6 Installation Instructions IMPOR T ANT 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, ...
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Pentair 250 - page 7
Rev . C 1 1-1-01 P/N 471593 7 Installation (Electrical) ELECTRICAL, ALL HSI UNITS Electrical Rating 50/60 Hz 120 V .A.C. ONL Y NOTE The transformer is pre-wired at the factory for 120 V AC 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 (GN ...
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Pentair 250 - page 8
P/N 471593 Rev . C 1 1-1-01 8 TWO-WIRE OR THREE-WIRE REMOTE HOOK-UP Installation (Remotes) Before connecting the remote control system please read the following: 1. 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 "SP A" and "POOL&qu ...
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Pentair 250 - page 9
Rev . C 1 1-1-01 P/N 471593 9 • Three-wir e 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 ...
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Pentair 250 - page 10
P/N 471593 Rev . C 1 1-1-01 10 Installation (Single V oltage Wiring) MiniMax NT Low NOx 400 HSI Electronic Ignition Wiring Diagram (SINGLE VOL T AGE) GRN IGN MODULE IGNITOR HOT SURFACE BURNER LOW GAS PRES. SWITCH GRN VAL TH S2 L2 L1 S1 MiniMax NT 400 LOW NOx WIRING DIAGRAM IF ORIGINAL FACTORY WIRING MUST BE REPLACED, INSTALLER MUST SUPPLY UL OR CSA ...
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Pentair 250 - page 11
Rev . C 1 1-1-01 P/N 471593 11 Installation (Single V oltage Wiring) MiniMax NT Low NOx 250 HSI Electronic Ignition Wiring Diagram (SINGLE VOL T AGE) GRN IGN MODULE IGNITOR HOT SURFACE BURNER LOW GAS PRES. SWITCH GRN VAL TH S2 L2 L1 S1 MiniMax NT 250 LOW NOx WIRING DIAGRAM IF ORIGINAL FACTORY WIRING MUST BE REPLACED, INSTALLER MUST SUPPLY UL OR CSA ...
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Pentair 250 - page 12
P/N 471593 Rev . C 1 1-1-01 12 Installation (Dual V oltage Wiring) MiniMax NT Low NOx (ALL MODELS) HSI Electronic Ignition Wiring Diagram (DUAL VOL T AGE) GRN IGN MODULE IGNITOR HOT SURFACE BURNER GND MV1 TH S2 L2 L1 S1/240 MiniMax NT LOW NOx ALL MODELS WIRING DIAGRAM IF ORIGINAL FACTORY WIRING MUST BE REPLACED, INSTALLER MUST SUPPLY UL OR CSA (IF ...
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Pentair 250 - page 13
Rev . C 1 1-1-01 P/N 471593 13 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. CAUTION Bef ...
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Pentair 250 - page 14
P/N 471593 Rev . C 1 1-1-01 14 Installation (Gas Line) 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 important because different types of gas require different gas pipe sizes. The rating plate on the heater will indicate which gas the heater is desig ...
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Pentair 250 - page 15
Rev . C 1 1-1-01 P/N 471593 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 ...
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Pentair 250 - page 16
P/N 471593 Rev . C 1 1-1-01 16 INDOOR INST ALLA TION (USA ONL Y) OUTDOOR SHEL TER INST ALLA TION (CANADA) See page 17 for (Indoor) 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 ...
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Pentair 250 - page 17
Rev . C 1 1-1-01 P/N 471593 17 . 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 Figure 15. Y L P P U S R I A D E R I U Q E R l e d o M n o i t s u b m o C r o f r i A . n I . q S n o i t a l i t n e V r i A . n I . q S 0 0 20 0 20 0 2 0 5 20 5 20 5 2 0 0 30 0 30 0 3 0 0 40 0 40 0 4 l e d o Mt i K e s a B e l b i t s u b m o ...
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Pentair 250 - page 18
P/N 471593 Rev . C 1 1-1-01 18 Detail H INDOOR INST ALLA TIONS MINIMAX NT LO W NOx VENTING GUIDELINES vent terminated at least 24" abov e any object within 10 ft. V ent Cap Ridge Chimney 3 ft. min. 2 ft. min. 10 ft. 4' 7' 4' Air Supply V entilation Air Supply Combustion V ent Hood W alkwa y 3' 1' min. 1' min. 1&ap ...
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Pentair 250 - page 19
Rev . C 1 1-1-01 P/N 471593 19 VENTILA TION OUTDOOR INST ALLA TION ONL Y (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 ...
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Pentair 250 - page 20
P/N 471593 Rev . C 1 1-1-01 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 ...
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Pentair 250 - page 21
Rev . C 1 1-1-01 P/N 471593 21 SAFETY CONTROLS AIR PRESSURE (F AN) 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 ignitio ...
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Pentair 250 - page 22
P/N 471593 Rev . C 1 1-1-01 22 SAFETY CONTROLS, (cont’d.) IGNITION MODULE The Ignition Module is microprocessor based and operates on 24 V AC 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 flam ...
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Pentair 250 - page 23
Rev . C 1 1-1-01 P/N 471593 23 MINIMAX NT LOW NOx PENT AIR TEMPERA TURE CONTROLLER 7800 (See Figur e 21, for keypad and Pentair T emperatur e Contr oller layout details.) GENERAL The MiniMax NT Low NOx Pentair T emperature Controller 7800 is the heart of the control system. It controls all functions of the heater after first verifying that all safe ...
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Pentair 250 - page 24
P/N 471593 Rev . C 1 1-1-01 24 OFF SPA POOL SET MODE PROGRAM TEMP TEMP STEP Increase Raise ( ) Decrease Lower ( ) 1. Before changing the temperature, make sure the “ T emperatur e ” is in the right window , see pages 24 and 25, if “ T ime ” is displayed, press the MODE key to change to the “T emperatur e Mode” . 2. T o change the Pool T ...
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Pentair 250 - page 25
Rev . C 1 1-1-01 P/N 471593 25 Time Setting (Programming) TIME SETTING, (cont’d.) 3. The first setting, once you enter the Pr ogramming Mode , will be the Day . The Day icon will be flashing. Use the UP or DOWN arrow TEMP keys to locate the appropriate day , then press the SET key . The Day is now set and the Hour T ime icon will start to flash. ...
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Pentair 250 - page 26
P/N 471593 Rev . C 1 1-1-01 26 LOW-NOx 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. Make sure there are no obstructions in the flow of combustion and ventila- tion air . 2. V isually inspect the main burner and th ...
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Pentair 250 - page 27
Rev . C 1 1-1-01 P/N 471593 27 Maintenance (W ater T reatment) RULE: 7.4 to 7.6 is a desirable pH range. It is essential to maintain correct pH, see T able 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. W ater becomes cloudy . 3. There is more danger of sc ...
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Pentair 250 - page 28
P/N 471593 Rev . C 1 1-1-01 28 NORMAL OPERA TION SEQUENCE (Refer to Figure 21 of Pentair T emperature 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 T emperature Controller 7800. Now that the heater has been properly installed and wired for ei ...
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Pentair 250 - page 29
Rev . C 1 1-1-01 P/N 471593 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 ...
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Pentair 250 - page 30
P/N 471593 Rev . C 1 1-1-01 30 LEGEND OF F AUL T 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 . This fault ...
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Pentair 250 - page 31
Rev . C 1 1-1-01 P/N 471593 31 SERVICE CHECKS—IGNITION MODULE s k c e h C e c i v r e S m o t p m y Se r u C / e s u a C d a e D . 1d e r i w s i M . A d a b r e m r o f s n a r T . B d a b r e k a e r b t i u c r i C / e s u F . C ) n o y d a e t s r o f D E L k c e h c ( l o r t n o c d a B . D n o i t i n g i o n — n o t a t s o m r e h T . ...
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Pentair 250 - page 32
P/N 471593 Rev . C 1 1-1-01 32 Possible Cause Remedy Heater will not come on Automatic ignition system fails 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 Defecti ...
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Pentair 250 - page 33
Rev . C 1 1-1-01 P/N 471593 33 MINIMAX NT LOW NOx HEA TER - (Single V oltage) 1 4 3 5 6 8 9 10 12 26 28 33 34 36 48 47 46 49 44 42 43 38 37 18 17 16 15 21 14 32 39 24 25 2 7 11 22 23 20 19 29 31 30 35 45 41 40 50 13 27 MiniMAX NT Low NOx, Single Voltage (Manufactured Date Prior to October 15, 2001) ...
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Pentair 250 - page 34
P/N 471593 Rev . C 1 1-1-01 34 ITEM DESCRIPT ION QTY . 250 400 1 Exhaust Gr ill 1 2 Gask et, Exhaust Grill 1 3T o p Cover 1 471692 471591 4 Exhaust Ass y . 1 471995 471996 5 S hu t-o ff Sa fet y Switch, Exhaust 1 6B l o w e r 1 7 Gask et, Blower 1 8 Flue Collector As s y . 1 472007 472005 9 Return Manifold As s y .1 10 Bolt, Heat Exchan g er 16 11 ...
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Pentair 250 - page 35
Rev . C 1 1-1-01 P/N 471593 35 MINIMAX NT LOW NOx HEA TER - (Dual V oltage) 1 4 3 5 6 8 9 10 12 26 28 33 34 36 48 47 46 44 42 43 38 37 18 17 16 15 21 14 32 39 24 25 2 7 11 22 23 20 19 29 31 30 35 45 41 40 13 27 MiniMAX NT Low NOx, Dual Voltage (Manufactured Date After October 15, 2001) ...
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Pentair 250 - page 36
P/N 471593 Rev . C 1 1-1-01 36 ITEM DESCRIPTION QTY . 200 250 300 400 1 Exhaust Grill 1 2 Gask et, Exhaust Grill 1 3T o p Cover 1 471885 471692 471886 471591 4 Exhaust Ass y . 1 472013 5 Shut -off S afe t y Switch, Exhaust 1 6 Blower 1 471938 471884 7 Gasket, Blower 1 8 Flue Collector Ass y . 1 472008 472007 472006 472005 9 Return Manifold Ass y .N ...
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Pentair 250 - page 37
Rev . C 1 1-1-01 P/N 471593 37 NOTES ...
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Pentair 250 - page 38
P/N 471593 Rev . C 1 1-1-01 38 NOTES ...
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Pentair 250 - page 39
Rev . C 1 1-1-01 P/N 471593 39 NOTES ...
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Pentair 250 - page 40
P/N 471593 Rev . C 1 1-1-01 40 40 MiniMax NT Low NOx Heaters Limited W arranty Y our 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 NOx cabinet and combustion chamber , the ...
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