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Pentair Pool Products MiniMax 250 Operating & Installation Manual

Low nox series pool & spa heaters.
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MiniMax
OPERATION & INSTALLATION MANUAL
FOR YOUR SAFETY - READ BEFORE OPERATING
Warning:
If you do not follow these instructions exactly, a fire or explosion may
result, causing property damage, personal injury or loss of life.
For additional free copies of this manual; call (800) 831-7133.
U.S. Patent Numbers
5,318,007 - 5,228,618
5,201,307 - 4,595,825
Warning: Improper installation, adjustment, alteration, service or maintenance can
cause property damage, personal injury or death. Installation and service must be
performed by a qualified installer, service agency or the gas supplier.
For Your
Safety
Rev. C 11-1-01
NT Low NOx Series
®
POOL & SPA HEATERS
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.
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or other appliances.
Pentair Pool Products, Inc.
1620 Hawkins Ave., Sanford, NC 27330
10951 W. Los Angeles Ave., Moorpark, CA 93021
WARNING
WARNING
(919) 774-4151
(805) 523-2400
1 1
1
To
Consumer
Retain For
Future
Reference
P/N 471593

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   Summary of Contents for Pentair Pool Products MiniMax 250

  • Page 1

    Rev. C 11-1-01 NT Low NOx Series ® POOL & SPA HEATERS WARNING WARNING Pentair Pool Products, Inc. 1620 Hawkins Ave., Sanford, NC 27330 (919) 774-4151 • 10951 W. Los Angeles Ave., Moorpark, CA 93021 Consumer Retain For...

  • Page 2: Table Of Contents

    Table of Contents Introduction ... Important Notices ... Code Requirements ... Warranty Information ... Operation ... Safety Rules ... HSI (Hot-Surface Ignition) Lighting/Operation - Natural Gas ... Installation Instructions—Specifications ... Installation — Electrical ... Installation — Remotes (2 and 3 Wire) ... 8 - 9 Installation —...

  • Page 3: Introduction, Important Notices, Code Requirements

    40 PVC pipe. The MiniMax NT Low NOx, also comes equipped with the Pentair multifunction temperature controller 7800 which shows, at a glance, the proper functioning of the heater. All HSI (hot-surface ignition) MiniMax NT Low NOx heaters are designed with a direct ignition device (HSI) which eliminates the need for a standing pilot.

  • Page 4: Warranty Information, Operation, Safety Rules

    Return the warranty registration card after filling in the serial number from the rating plate inside the heater. Pentair Pool Products’ high standards of excellence include a policy of continuous product improvement resulting in your state-of-the-art heater. We reserve...

  • Page 5: Operating Instructions, To Turn Off Gas To Appliance

    E. The MiniMax NT Low NOx incorporates the Pentair temperature controller 7800 to aid you in the operation of the heater, and to assist in diagnosing a failure in the heater’s function.

  • Page 6: Installation Instructions—specifications

    Installation Instructions SPECIFICATIONS IMPORTANT NOTICE: These installation instructions are designed for use by qualified personnel only, trained especially for installation of this type of heating equipment and related components. Some states require installation and repair by licensed personnel. If this applies in your state, be sure your contractor bears the appropriate license.

  • Page 7: Installation — Electrical

    Installation (Electrical) ELECTRICAL, ALL HSI UNITS Electrical Rating 50/60 Hz The transformer is pre-wired at the factory for 120 VAC operation ,connect line supply to the line terminal block inside junction box. Use caution in necting supply to proper Line (L), Neutral (N), and Ground (GND) terminals; see below, Figure 5.

  • Page 8

    Installation (Remotes) TWO-WIRE OR THREE-WIRE REMOTE HOOK-UP 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 "SPA"...

  • Page 9

    POWER TPROBE (AUX1) This icon is not a fault icon but instead indicates a remote switching device is connected to the Pentair Temperature Controller 7800, and has overriding selection control of Pentair Temperature Controller 7800. 5 A FUSE FOR AUX2 (PILOT DUTY ONLY)

  • Page 10

    Installation (Single Voltage Wiring) MiniMax NT Low NOx 400 HSI Electronic Ignition Wiring Diagram (SINGLE VOLTAGE) P/N 471593 SPEED SPEED POOL Rev. C 11-1-01...

  • Page 11

    Installation (Single Voltage Wiring) MiniMax NT Low NOx 250 HSI Electronic Ignition Wiring Diagram (SINGLE VOLTAGE) Rev. C 11-1-01 POOL P/N 471593...

  • Page 12

    Installation (Dual Voltage Wiring) MiniMax NT Low NOx (ALL MODELS) HSI Electronic Ignition Wiring Diagram (DUAL VOLTAGE) P/N 471593 POOL PUMP RELAY Rev. C 11-1-01...

  • Page 13: Installation — Plumbing

    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 Before operating the heater on a new installation,...

  • Page 14: Installation — Gas Line, Regulated Manifold Pressure Test

    Installation (Gas Line) 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 important because different types of gas require different gas pipe sizes. The rating plate on the heater will indicate which gas the heater is designed to burn.

  • Page 15

    Installation (Indoor) 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.

  • Page 16

    Installation (Indoor) INDOOR INSTALLATION (USA ONLY) OUTDOOR SHELTER INSTALLATION (CANADA) See page 17 for (Indoor) Vent 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 indoor stack adaptor and extended at least 2 feet higher than highest point of the roof within a 10 foot...

  • Page 17

    Installation (Indoor) NOTE The heater requires two uninterrupted air supply openings; one for ventilation and one to supply oxygen for proper gas combustion. The air supply openings should be sized according to Table 2. Air supply requirements below apply to all MiniMax NT Low NOx heaters*.

  • Page 18

    Installation (Indoor) P/N 471593 Rev. C 11-1-01...

  • Page 19

    Installation (Outdoor) VENTILATION OUTDOOR INSTALLATION ONLY For outdoor installation with built in vent, the heater must be placed in a suitable area on a level, noncombustible surface. Do not install the heater under an overhang with clearances less than 3 feet from the top of the heater. The area under an overhang must be open on three sides.

  • Page 20: Basic Operation — General Description

    2. Set thermostat to lowest setting by using up/down arrow keys. See page 24. 3. Push the off key on the Pentair temperature controller 7800 (the amber “off “ led will illuminate). See page 24. 4. Open the access doors.

  • Page 21: Basic Operation — Safety Controls

    Basic Operation SAFETY CONTROLS AIR PRESSURE (FAN) SWITCH The air pressure switch is a safety device used to insure that the blower (fan) is operating and has been designed to monitor the vacuum (negative) pressure within the blower housing. The air pressures switch is factory set and is in the ignition module circuit—...

  • Page 22

    Basic Operation SAFETY CONTROLS, (cont’d.) IGNITION MODULE The Ignition Module is microprocessor based and operates on 24 VAC supplied by the transformer. The control utilizes a microprocessor to continually and safely monitor, analyze, and control the proper operation of the gas burners. The module with the presence of the flame sensor/ignitor or remote sensor, using flame rectification, allows the heater to operate.

  • Page 23: Thermostat (programming & Layout)

    POOL mode by depressing the “POOL” key and repeat the temperature setting procedure in this example. The Pentair Temperature Controller 7800 remembers the last set temperature for both the POOL and SPA mode and you may cycle between the two settings with the POOL and SPA selector keys.

  • Page 24: Temperature & Time Setting (programming)

    Temperature & Time Setting (Programming) TO CHANGE THE FACTORY TEMPERATURE SETTINGS: 1. Before changing the temperature, make sure the “Temperature” is in the right window, see pages 24 and 25, if “Time” is displayed, press the MODE key to change to the “Temperature Mode”. 2.

  • Page 25

    Time Setting (Programming) TIME SETTING, (cont’d.) 3. The first setting, once you enter the Programming Mode, will be the Day. The Day icon will be flashing. Use the UP or DOWN arrow TEMP keys to locate the appropriate day, then press the SET key. The Day is now set and the Hour Time icon will start to flash.

  • Page 26: Maintenance, Maintenance Instructions, Pressure Relief Valve

    Maintenance MAINTENANCE INSTRUCTIONS It is recommended that you check the following items at least every six months and at the beginning of every swimming season. 1. Examine the venting system. Make sure there are no obstructions in the flow of combustion and ventila- tion air.

  • Page 27: Maintenance (water Treatment)

    Maintenance (Water Treatment) CHEMICAL BALANCE POOL AND SPA WATER Your Pentair Pool Products pool heater was designed specifically for your spa or pool and will give you many years of trouble-free service, provided you keep your water chemistry in proper condition.

  • Page 28: Trouble Shooting, Normal Operation Sequence

    To clear the fault condition power to the Pentair Temperature Controller 7800 must be cycled to reset system. If heater continues to fail to light have heater inspected by a qualified service person before placing heater back in service.

  • Page 29

    During this automatic crossover sequence the keyboard on the Pentair Temperature Controller 7800 will not accept any further keying until the cycle completes—the exception is you may still stop the heater with the “OFF” key.

  • Page 30: Troubleshooting & Service

    Troubleshooting & Service LEGEND OF FAULT ICONS AND TYPE OF PROBLEMS FLAGGED This fault icon displays whenever there is an unexpected loss of flame. This condition may arise from air in gas supply line or malfunction of flame detection circuit or related hardware.This is a hard lockout condition requiring a manual reset to clear.

  • Page 31

    Troubleshooting & Service SERVICE CHECKS—IGNITION MODULE i v r t a t e v l o t i a l f FLAME SENSOR CURRENT CHECK MULTI-PURPOSE METER USE MICROAMP SCALE Figure 25. SERVICE CHECKS Flame current is the current which passes through the flame from the sensor to ground. The minimum flame current necessary to keep the system from lockout is 0.7 microamps.

  • Page 32: Troubleshooting (general)

    Troubleshooting - General Possible Cause Heater will not come on Automatic ignition system fails Pump not running Pump air locked Filter dirty Pump strainer clogged Defective wiring or connection Defective pressure switch Defective gas controls On-Off switch in "OFF" position Heater Short Cycling Insufficient water flow Defective wiring...

  • Page 33

    MINIMAX NT LOW NOx HEATER - (Single Voltage) (Manufactured Date Prior to October 15, 2001) Rev. C 11-1-01 MiniMAX NT Low NOx, Single Voltage P/N 471593...

  • Page 34

    MiniMax NT Low NOx Single Voltage Replacement parts ITEM DESCRIPTION Exhaust Grill Gasket, Exhaust Grill Top Cover Exhaust Assy. Shut-off Safety Switch, Exhaust Blower Gasket, Blower Flue Collector Assy. Return Manifold Assy. Bolt, Heat Exchanger Washer, Heat Exchanger Fire box Assy. Heat Exchanger Assy.

  • Page 35

    MINIMAX NT LOW NOx HEATER - (Dual Voltage) MiniMAX NT Low NOx, Dual Voltage (Manufactured Date After October 15, 2001) Rev. C 11-1-01 P/N 471593...

  • Page 36

    MiniMax NT Low NOx Dual Voltage Replacement parts ITEM DESCRIPTION Exhaust Grill Gasket, Exhaust Grill Top Cover Exhaust Assy. Shut-off Safety Switch, Exhaust Blower Gasket, Blower Flue Collector Assy. Return Manifold Assy.Non-ASME Bolt, Heat Exchanger, Non-ASME Washer, Heat Exchanger Fire box Assy. Heat Exchanger Assy.

  • Page 37

    NOTES Rev. C 11-1-01 P/N 471593...

  • Page 38

    NOTES P/N 471593 Rev. C 11-1-01...

  • Page 39

    NOTES Rev. C 11-1-01 P/N 471593...

  • Page 40: Limited Warranty

    Copies of this manual are available by writing to Pentair Pool Products, Inc., at the address below. Pentair Pool Products, Inc. assumes no liability except for the repair or replacements of parts as specified above.

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  • Ken Lobsinger Mar 14, 2016 02:53:
    none yet... this is required to see the manual.