Reznor VR Unit Installation Manual - Manual (Page 29)

Form I-VR, P/N 205202 R13, Page 28
6.4.2 Dual Vent
Terminal, Option CC5 Duel Venting - By using the Dual Vent Option Kit,
Option CC5, two heaters may use the same vent
terminal. No other dual venting arrangement is
approved.
Follow the installation instructions and requirements
included in the Option Kit. See Vent Terminal Arrange-
ments in FIGURES 28A and 28B.
6.4 Venting and Combustion Air (cont’d) 6. Mechanical
(cont’d)
Dual Vent Terminal Kit
6 ft
(1.8M)
minimum
Roof Flashing
Roof pitched
from 0 to 45°
6” (152mm)
minimum
Follow the instructions in the Addendum, page 45, to join double-wall
and single-wall pipe and to attach a vent cap to double wall pipe.
Vertical flue extension
to be 6” (152mm)
higher than anticipated
snow depth but no less
than 24” (610mm) above
the roof. Vertical pipe
extension must be
insulated.
Parapet or adjoining building
3 ft (.9M)
minimum
If the fresh air intake
is within 10 feet (3M)
of the flue extension,
the flue extension
must be at least 12”
(305mm) higher than
the fresh air intake.
Fresh air
intake must
be 6” (152mm)
higher than
anticipated
snow depth.
Clearance
thimble is required when flue pipe
extends through combustible materials.
Follow the requirements of the thimble
and/or the vent pipe manufacturer.
6 ft
(1.8M)
minimum
Roof Flashing
Vertical flue extension must
be 6” (152mm) higher than
anticipated snow depth but no
less than 24” (610mm) above
the roof. Vertical pipe exten-
sion must be insulated.
Parapet or adjoining building
Roof pitched
from 0 to 45°
Clearance thimble is required
when flue pipe extends through
combustible materials. Follow
the requirements of the thimble
and/or vent pipe manufacturer.
FIGURE 27A - Vertical Vent Terminal Arrangements
(drawings are not proportional; read all information)
6 ft
(1.8M)
minimum
Roof Flashing
Roof pitched
from 0 to 45°
Vertical flue extension to
be 6” (152mm) higher than
anticipated snow depth but
no less than 24” (610mm)
above the roof. Vertical pipe
extension must be insulated.
Parapet or adjoining building
Follow the instructions in
the Addendum, page 45, to
join double-wall and single-wall pipe
and to attach a vent cap to double-wall pipe.
6” (152mm)
minimum
Clearance thimble is required
when flue pipe extends through
combustible materials. Follow the
requirements of the thimble and/or
the vent pipe manufacturer.
FIGURE 27B - Vertical Vent Terminal/Air Intake Arrangements
(drawings are not proportional; read all
information)
6 ft
(1.8M)
minimum
Roof Flashing
Roof pitched
from 0 to 45°
Vertical flue extension
to be 6” (152mm) higher
than anticipated snow
depth but no less than
24”(610mm) above the
roof. Vertical pipe exten-
sion must be insulated.
3 ft (.9M)
minimum
Fresh air
intake must
be 6” (152mm)
higher than
anticipated
snow depth.
If the fresh air intake
is within 10 feet (3M)
of the flue extension,
the flue extension
must be at least 12”
(305mm) higher than
the fresh air intake.
Parapet or adjoining building
Clearance thimble is
required when flue pipe
extends through combus-
tible materials. Follow the
requirements of the
thimble and/or the
vent pipe manufacturer.
SINGLE WALL - Single wall vent run and
single wall terminal end
DOUBLE WALL - Single wall vent run and
double wall terminal end
SINGLE WALL - Single-wall vent run;
single-wall terminal end; and single-wall
fresh air intake
DOUBLE WALL - Single-wall vent run;
double-wall terminal end; and single-wall
fresh air intake
Vertical Vent and Inlet Air Terminals
6.4.1 Specific Venting Requirements (cont’d)
WARNING: Dual venting of two heaters is permitted only when using the Dual Vent
Kit, Option CC5. (Refer to FIGURES 28A and 28B.) No other manifolding of vent runs
is permitted due to possible back pressure and recirculation of combustion products
into the building. See Hazard Levels, page 2.