Technical data

Page 12
Page __________ of __________
Outside Combustion Air
INFRA-REZ
®
Model TR heaters may be operated with combustion air from the heated space or with combustion air piped
from outside. If outside combustion air is selected, a Reznor outside combustion air kit must be installed, Outside combus-
tion air may be supplied in any vented application but should always be supplied (1) if the building atmosphere has negative
pressure; (2) if the building atmosphere is dirty or dusty; (3) if the building atmosphere contains substances that will cause
toxic gas when combined with flame or flue
products; (4) if the heater is installed in a tightly
closed room that does not provide required
air for combustion.
The outside combustion air kit for INFRA-REZ
®
Model TR heaters includes a section of 4” flex-
ible pipe expandable to three feet, a special
designed inlet air cap, and two clamps. The
maximum length of the field-supplied combus-
tion air pipe depends on the size and length
of heater and the type of pipe.
Reflector Gaps Covers
and End Covers
Reflector gap covers are designed to provide the system with
a continuous reflector while still allowing for system expan-
sion. The gap covers “fill-in the gaps” at the ends of the tube
reflectors.
End caps vertically “close” both the combustion chamber end
and the tail pipe end of the reflector system.
Reflector gap covers may be installed on any INFRA-REZ
®
heater system. End covers may only be used in conjunction
with the gap covers.
Side Shield
An optional side shield may be added to INFRA-REZ
®
Model
TR heaters. With an optional side shield installed along one
side of the length of a straight tubular system, the heater may
be installed with much less clearance to combustibles.
The aluminum side shield is a modular design with two sec-
tions per 10-ft. tube. The modular sections hang from the
tube reflector brackets. Reflector brackets, reflectors, and
optional side shield are designed for easy installation.
Covers the gaps
creating a continuous
reflector
Reflector Gap Cover
Optional Reflector
Gap Cover
NOTE: Reflectors on systems with gap covers cannot be rotated.
U-Bolt
Reflector
Bracket
Optional
Side Shield
Tube
Reflector
Reflector
Retainer
Options (Continued from previous page)
INFRA-REZ
®
HEATER Model TR
Combustion
Air Inlet
Length
Table
NOTE: Do not install
an outside combus-
tion air inlet on an
unvented heater.
MAXIMUM LENGTH OF OUTSIDE COMBUSTION AIR INLET
PIPE
EQUIVALENT LENGTH
FOR
TYPE OF SIZE 90° Elbow 45° Elbow
INLET PIPE MBH Meters Feet Meters Feet Meters Feet
50
75 24.4 80 3.0 10 1.5 5
100
125
150 18.3 60 3.0 10 1.5 5
175
200
50
75 12.2 40 N/A N/A N/A N/A
100
125
150 9.1 30 N/A N/A N/A N/A
175
200
Corrugated
or Flexible

Assumes the use of three feet of flexible pipe at the
combustion air inlet on the burner/control box
MAXIMUM
LENGTH

Smooth
Wall