Instruction/ maintenance manual of the product 250 Pentair
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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.
P/N 471593 Rev . C 1 1-1-01 2 T able of Contents Introduction ............................................................................................................... 3 Important N otices ........................................................
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.
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.
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.
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.
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.
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.
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 co.
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.
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.
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.
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.
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.
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 .
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 .
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 .
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.
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.
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.
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.
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.
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.
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” .
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 .
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 .
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.
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.
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).
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.
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 .
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.
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.
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 .
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 4.
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 .
Rev . C 1 1-1-01 P/N 471593 37 NOTES.
P/N 471593 Rev . C 1 1-1-01 38 NOTES.
Rev . C 1 1-1-01 P/N 471593 39 NOTES.
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.
An important point after buying a device Pentair 250 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Pentair 250 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Pentair 250 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Pentair 250 you will learn all the available features of the product, as well as information on its operation. The information that you get Pentair 250 will certainly help you make a decision on the purchase.
If you already are a holder of Pentair 250, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Pentair 250.
However, one of the most important roles played by the user manual is to help in solving problems with Pentair 250. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Pentair 250 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
