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Installation (Indoor)
INDOOR VENTING—General Requirements
The vent pipe must be the same size or larger. The MiniMax NT/TSI 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. The total length of the horizontal run must not exceed the length that is listed below in the tables.
Please note the allowable vent runs for each stack pipe diameter are different and can not be exceeded.
Note that each 90-degree elbow reduces the maximum horizontal vent run by 8 feet and each 45-degree elbow
in the vent run reduces the maximum vent run by 4 feet. See the tables below for the maximum vent lengths
using a 90-degree and 45-degree elbows.
The MiniMax NT/TSI Low NOx is a "Category III" appliance and is an induced-draft pool and spa heater which
uses positive pressure to push flue gases through the vent pipe to the outside. This requires a completely sealed
vent system—single wall vent pipe with sealed-seams and joints may be used.
Flue gases under positive pressure may escape into the dwelling with any cracks
or loose joints in the vent pipe, or improper vent installation. The vent pipe must
be of a sealed-seam construction such as those listed for use with "Category III
Appliances" and for operating temperatures above 350° F. The use of listed
thimbles, roof jacks and/or side vent terminals are required; and the proper
clearances to combustible materials must be maintained in accordance with type of
vent pipe employed—in the absence of a clearance recommendation by the vent pipe
manufacturer, the requirements of the Uniform Mechanical Code should be met.
The ventilation air requirements for the MiniMax NT/TSI Low NOx heater can
be found on
page
20. It is recommended that vent runs over 18 feet be insulated to
reduce condensation related problems and/or the use of a condensate trap in the vent
run close to the heater may be necessary in certain
installations such as cold climates. The MiniMax NT/TSI
Low NOx is suitable for through-the-wall venting,
see table and dimensions below.
Recommended sources for Side-wall vent hood terminals
include: The Field Controls Co. (2308 Airport Road,
Kingston, NC 28501, (800)742-8368) and Tjernlund
Products Inc. (1601 Ninth Street, White Bear Lake, MN
55110, (800) 255-4208)—consult manufacturer for model
information and availability.
CAUTION
Do NOT combine exhaust vent pipes to a common exhaust
vent in multiple unit installations. Run separate vent pipes.
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Rev. B 1-22-04
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