Pentair Pool Products MiniMax 250 User Manual

Rev. C 11-1-01 P/N 471593
1
1
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.
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or other appliances.
For Your
Safety
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.
MiniMax
®
NT Low NOx Series
POOL & SPA HEATERS
OPERATION & INSTALLATION MANUAL
WARNING
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.
WARNING
U.S. Patent Numbers
5,318,007 - 5,228,618
5,201,307 - 4,595,825
Pentair Pool Products, Inc.
1620 Hawkins Ave., Sanford, NC 27330 • (919) 774-4151
10951 W. Los Angeles Ave., Moorpark, CA 93021
• (805) 523-2400
1
To
Consumer
Retain For
Future
Reference

Pentair Pool Products MiniMax 250 Specifications

General

Model	MiniMax 250
Category	Swimming Pool Heater
Heating Capacity	250, 000 BTU/hr
Fuel Type	Natural Gas or Propane
Heat Exchanger	Copper
Type	Gas
Ignition Type	Electronic
Warranty	1 year
Efficiency	80% Thermal Efficiency (approximate)

Summary

Introduction

IMPORTANT NOTICES

Crucial warnings for installers and operators regarding warranty and proper usage.

CODE REQUIREMENTS

Specifies adherence to national and local electrical and fuel gas codes for installation.

Operation

SAFETY RULES

Essential guidelines for safe use of spa and hot tub water temperatures and user precautions.

WARRANTY INFORMATION

Details on the limited factory warranty, including registration and limitations.

MINIMAX NT LOW NOx HSI ELECTRONIC IGNITION LIGHTING/OPERATION - NATURAL GAS

OPERATING INSTRUCTIONS

Step-by-step guide for lighting and operating the heater safely and correctly.

TO TURN OFF GAS TO APPLIANCE

Procedure for safely shutting off the gas supply to the heater.

Installation Instructions

SPECIFICATIONS

Key technical specifications including dimensions and model details for ventilation.

OUTDOOR VENTILATION

Guidelines and diagrams for outdoor ventilation installations.

INDOOR VENTILATION

Guidelines and diagrams for indoor ventilation installations.

Installation (Electrical)

ELECTRICAL, ALL HSI UNITS

Details on the electrical rating and connection requirements for HSI units.

Installation (Remotes)

TWO-WIRE OR THREE-WIRE REMOTE HOOK-UP

Instructions for connecting remote control systems to the heater.

Installation (Single Voltage Wiring)

MiniMax NT Low NOx 400 HSI Electronic Ignition Wiring Diagram

Technical diagram illustrating the wiring for the 400 model HSI unit.

Installation (Single Voltage Wiring)

MiniMax NT Low NOx 250 HSI Electronic Ignition Wiring Diagram

Technical diagram illustrating the wiring for the 250 model HSI unit.

Installation (Dual Voltage Wiring)

MiniMax NT Low NOx (ALL MODELS) HSI Electronic Ignition Wiring Diagram (DUAL VOLTAGE)

Technical diagram for dual voltage models covering all HSI units.

Installation (Plumbing)

WATER CONNECTIONS

Details on reversible inlet/outlet connections and reversing water connections.

PLUMBING CONNECTIONS

Information on direct schedule 40 PVC plumbing connections and bulkhead fittings.

Installation (Gas Line)

GAS CONNECTIONS

Guidelines for connecting the gas line, including pipe sizing and pressure requirements.

REGULATED MANIFOLD PRESSURE TEST

Procedure for testing and adjusting the regulated manifold pressure.

Installation (Indoor)

INDOOR VENTING—General Requirements

Requirements for indoor venting, including pipe sizing, elbows, and terminal types.

Installation (Indoor)

INDOOR INSTALLATION (USA ONLY) OUTDOOR SHELTER INSTALLATION (CANADA)

Specific instructions for indoor installation and outdoor shelter installation in Canada.

Installation (Indoor)

REQUIRED AIR SUPPLY

Table detailing required air supply (combustion and ventilation) for different models.

INSTALLATION ON FLOORS CONSTRUCTED OF COMBUSTIBLE MATERIALS

Methods for installing the heater on combustible floors using bases or kits.

Installation (Indoor)

MINIMAX NT LOW NOx VENTING GUIDELINES

Detailed guidelines for vent termination for roof and side wall installations.

Installation (Outdoor)

MINIMAX NT VENTING GUIDELINES

Guidelines for outdoor installation, including clearances and vent termination.

Basic Operation

GENERAL DESCRIPTION

Overview of the MiniMax NT Low NOx heater's features and capabilities.

TO OPERATE HEATER

Step-by-step instructions for starting and operating the heater.

Basic Operation

SAFETY CONTROLS

Explanation of safety controls like air pressure, water pressure, and low gas pressure switches.

AIR PRESSURE (FAN) SWITCH

Details on the function and operation of the air pressure safety switch.

Basic Operation

IGNITION MODULE

Information on the microprocessor-based ignition module and its operation.

FAILURE TO LIGHT-LOCK OUT

Description of the lockout condition when the burner fails to light.

Thermostat (Programming & Layout)

PENTAIR TEMPERATURE CONTROLLER 7800

Overview of the Pentair Temperature Controller 7800, its layout, and functions.

NORMAL OPERATION (NO REMOTE)

Instructions for normal operation and setting temperatures without a remote.

Temperature & Time Setting (Programming)

TO CHANGE THE FACTORY TEMPERATURE SETTINGS:

Procedure for changing the factory default pool and spa temperature settings.

TIME SETTING

Instructions for setting the day and time on the controller.

Maintenance

MAINTENANCE INSTRUCTIONS

Recommended checks for the heater at least every six months and at the start of the season.

ENERGY SAVING TIPS

Tips to improve energy efficiency and reduce heating costs.

Maintenance (Water Treatment)

CHEMICAL BALANCE

Importance of maintaining proper chemical balance (pH, disinfectant) for heater longevity.

WHAT IS A DISINFECTANT RESIDUAL?

Explanation of disinfectant residual levels and testing for pool water.

Troubleshooting—Normal Operation Sequence of Heater

NORMAL OPERATION SEQUENCE

Description of the heater's automated firing start-up and shutdown sequence.

Troubleshooting & Service

LEGEND OF FAULT ICONS AND TYPE OF PROBLEMS FLAGGED

Explanation of fault icons displayed on the controller and associated problems.

Troubleshooting - General

Heater will not come on

Possible causes and remedies when the heater fails to start.

Heater Short Cycling (Rapid On and Off Operation)

Troubleshooting steps for issues causing the heater to cycle on and off rapidly.

MINIMAX NT LOW NOx HEATER - (Single Voltage)

MiniMAX NT Low NOx, Single Voltage

Exploded view diagram for single voltage models.

MiniMax NT Low NOx Single Voltage Replacement parts

MINIMAX NT LOW NOx HEATER - (Dual Voltage)

MiniMAX NT Low NOx, Dual Voltage

Exploded view diagram for dual voltage models.

MiniMax NT Low NOx Dual Voltage Replacement parts

MiniMax NT Low NOx Heaters Limited Warranty

Limited Warranty

Details the parts covered, duration, and conditions of the heater's limited warranty.