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Pentair Pool Products MiniMax NT Standard Series Operation & Installation Manual

Minimax nt standard series pool & spa heaters.
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MiniMax NT Standard Series
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
Rev. A 1-2-02
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
(919) 774-4151
(805) 523-2400
1 1
Retain For
P/N 472032



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   Summary of Contents for Pentair Pool Products MiniMax NT Standard Series

  • Page 1

    MiniMax NT Standard Series 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.

  • Page 2: Table Of Contents

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

  • Page 3: Introduction

    If you need any more information, or if you have any questions regarding to this pool heater, please contact Pentair Pool Products, Inc. at (800) 831-7133. These heaters are designed for the heating of swimming pools and spas, and should never be employed for use as space heating boilers, general purpose water heaters, in non-stationary installations, or for the heating of salt water.

  • Page 4: Warranty Information

    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: Hsi (hot-surface Ignition) Lighting/operation

    E. The MiniMax NT Standard incorporates the Pentair 7800 temperature controller 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

    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, for MiniMax NT Standard Heaters Electrical Rating 50/60 Hz The MiniMax NT Standard heater is prewired for 240 volt AC connection using the “BROWN” female connector and the “WHITE” common male connector; see below, Figure 4. If you require the heater to be connected to 120 volts AC, remove the “BROWN”...

  • Page 8: Installation - Remotes (2 And 3 Wire)

    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 - Wiring Diagram

    Installation (Dual Voltage Wiring) MiniMax NT Standard (ALL MODELS) HSI Electronic Ignition Wiring Diagram (DUAL VOLTAGE) P/N 472032 POOL PUMP RELAY FENWAL Rev. A 1-2-02...

  • Page 11: Installation - Water Connections

    40 PVC plumbing connections. A set of bulkhead fittings is included with the MiniMax NT Standard 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 12: Installation - Gas Line

    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 13: Venting - Indoor Installations

    Installation (Indoor) INDOOR VENTING—General Requirements The vent pipe must be the same size or larger. The MiniMax NT Standard 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°...

  • Page 14

    Installation (Indoor) INDOOR INSTALLATION (USA ONLY) OUTDOOR SHELTER INSTALLATION (CANADA) See page 15 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 15

    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 Standard heaters*.

  • Page 16

    Installation (Indoor) P/N 472032 Rev. A 1-2-02...

  • Page 17: Venting - Outdoor Installations

    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 18: Basic Operation - General Description

    2. Set thermostat to lowest setting by using up/down arrow keys. See page 22. 3. Push the off key on the Pentair temperature controller 7800 (the amber “off “ led will illuminate). See page 21. 4. Open the access doors.

  • Page 19: 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—the ignition module does not operate unless the air pressure switch and all safety switches are closed.

  • Page 20: Basic Operation - Hsi Ignition Module

    A “High Limit”, is a safety device that opens the electrical circuit and shuts off the heater based on a temperature set point within the “High Limit Device”. The MiniMax NT Standard series of heaters contains three (3) high limit devices, two (2) are located on the main inlet / outlet header, one sensing the inlet water temperature and one sensing the outlet water temperature.

  • Page 21: 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 22: 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 22 and 23, if “Time” is displayed, press the MODE key to change to the “Temperature Mode”. 2.

  • Page 23

    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 24: Maintenance

    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 ventilation air.

  • Page 25: 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 26: Trouble Shooting

    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 27

    POOL OR SPA (DISPLAY ALTERNATELY ON LCD TO SHOW ACTIVE SELECTION) FAULT CONDITION LCD ICONS Figure 23. Illustration of Pentair Temperature Controller 7800 with all fault icons displayed for clarity. SERVICE CHECKS—IGNITION MODULE i v r t a t e v l...

  • Page 28: 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 29: 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 30: Minimax Nt Standard Parts List & Exploded View (dual Voltage)

    MINIMAX NT STANDARD HEATER - (Dual Voltage) P/N 472032 Rev. A 1-2-02...

  • Page 31

    MiniMax NT Standard 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 W asher, Heat Exchanger Fire box Assy.

  • Page 32: 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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