Reznor VR Unit Installation Manual - Manual (Page 30)

Form I-VR, P/N 205202 R13, Page 29
Roof or building overhang
3 ft (.9M)
minimum
6 ft (1.8M)
minimum
18” (457 mm)
minimum
6” (152mm)
clearance to
combustibles
Dual Vent
Adapter Box
Wall
6 ft (1.8M)
maximum
Parapet or adjoining building
Pitch flue pipe down toward outlet 1/4 inch
per foot for condensate drainage.
Approved clearance thimble is required when flue pipe
extends through combustible materials. Follow the require-
ments of the thimble and/or the vent pipe manufacturer.
Single wall outer dual vent pipe
Single wall inner dual vent pipe
FIGURE 28B -
Horizontal Dual Vent
Terminal Arrangement
FIGURE 28A -
Vertical Dual
Vent Terminal
Arrangement
Dual Vent Terminal Arrangements with Option CC5
Model VR/GVR heaters are approved for operation without an outdoor vent.
Before installing a tubular infrared heater in the unvented mode, extreme care
should be exercised in examining the building atmosphere and structure.
Where an unvented infrared heater is used, natural or mechanical means
shall be provided to supply and exhaust at least 4 cfm for natural gas and
5 cfm for propane gas, per hour input of installed heaters.
Exhaust openings for removing flue products shall be above the level of the
heater.
When mechanical means is provided to supply and exhaust, a positive inter-
lock must be provided by the installer so that the heater cannot operate unless
the supply and exhaust system is operating.
• Do not operate in the unvented mode when dust or dirt are present.
• Do not operate in the unvented mode in a building where contaminants
are in the air that will produce a toxic gas when burned or exposed to high
temperatures.
NOTE: If either of the above situations exist, it is recommended that a vented
system with an optional combustion air inlet be installed.
6.4.3 Unvented
Installation
6” (152mm)
clearance to combustibles
Dual Vent
Adapter
Box
6 ft
(1.8M)
maximum
6 ft (1.8M)
minimum
Vent pipe
from heater
Vent pipe
from heater
Vertical extension must be 6”
(152mm) higher than anticipated
snow depth but not less than 24”
(610mm) above the roof
Roof Flashing
Parapet or adjoining bulding
Approved clearance thimble is required when
flue pipe extends through combustible materials.
Follow the requirements of the thimble and/or
the vent pipe manufacturer.
Single-wall outer dual vent pipe
Single-wall inner dual vent pipe
FIGURE 29 - Install
“Inverted” Terminal
Cap on an Unvented
Heater