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Introduction
Congratulations on your purchase of a MiniMax NT/TSI 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/TSI Low NOx is a compact, lightweight, efficient, induced-draft, gas fired high
performance pool and spa heater that can be directly connected to schedule 40 PVC pipe. The MiniMax NT/TSI
Low NOx, also comes equipped with the Pentair multifunction temperature controller which shows, at a glance, the
proper functioning of the heater. All MiniMax NT/TSI Low NOx heaters are designed with a hot-surface ignition
(HSI) which eliminates the need for a standing pilot. The MiniMax NT/TSI Low NOx requires an external power
source (120/240 VAC 60 Hz) to operate.
This instruction manual provides operating instructions, installation and service information for the MiniMax NT/TSI
Low NOx high performance heater. The information in this manual applies to the MiniMax NT/TSI Low NOx 200,
250, 300, and 400 natural gas models.
It is very important that the owner/installer read and understand the section covering installation instructions, and
recognize the local and state codes before installing the MiniMax NT/TSI Low NOx. History and experience has
shown that most heater damage is caused by improper installation practices.
GENERAL DESCRIPTION
The MiniMax NT/TSI Low NOx Pool and Spa Heater incorporates a special burner with an induced draft
combustion system. The heater series is available in 200,000/250,000/300,000 and 400,000 Btu/hr.
The MiniMax NT/TSI Low NOx heaters are design certified by CSA (Canadian Standards Association) as complying
with the latest edition of ANSI (American National Standard Institute) Z21.56 · CSA 4.7-M98 in the USA and
Canada for both indoor and outdoor installations.
The MiniMax NT/TSI series complies with the Low Nitrogen Oxides emission requirements of California, South
Coast Air Quality Management District (SCAQMD) Rule 1146.2, Ventura County Air Pollution Control District
(APCD) Rule 74.11.1 and Title 30 Texas Administrative Code (TAC), Chapter 177.465.
The MiniMax NT/TSI Low NOx is designed to operate both in stackless outdoor installations and indoors with
stack vent installations—the indoor installation may be made using Kit 460506 or 460507; see
vertical vent pipe or with an approved side-wall vent.
CODE REQUIREMENTS
The installation must conform with local codes or in the absence of local codes with the latest
National Fuel Gas Code, ANSI Z223.1, and the latest edition of the National Electrical Code, NFPA 70.
Installation in Canada to be made in accordance with the latest CAN/CGA-B149.1 or .2 and
CSA C22.1 Canadian Electric Code, part 1.
Rev. B 1-22-04
3
pages 6 and
20,
P/N 472235
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