DIVERSITECH CVENT-2-EXT User manual

CVENT-2-EXT
Extended Concentric Vent Kit – 2”
•Simplies the installation of high eciency furnaces
•Requires only one hole to be cut rather than two
•Saves time & money during installation

Extended Concentric Vent Installation Instructions
CVENT-2-EXT Extended Concentric Vent Termination
For use with all condensing gas furnace models
General
The Extended Concentric Vent allows both the intake for combustion air and the exhaust vent to pass through a standard roof or
sidewall. This is an alternative to the standard two pipe intake/vent shown in the basic furnace installation instructions.
Follow these instructions as well as the basic furnace installation instruction for installation of the intake/vent pipe(s) and all
furnace installation procedures.
Refer to the furnace installation instructions for intake/vent pipe sizing information.
NOTE: The Extended Concentric Vent reduces the allowable intake/vent piping length by 5 feet from that listed in the basic furnace
installation instructions.
Do not operate the furnace until the installation and assembly
of the Extended Concentric Vent and all piping are completed.
Failure to follow this warning could result in product damage
or improper operation, personal injury or death.
WARNING:
This kit contains the following parts:
(1) Combustion Air Inlet Cap
(1) Air Inlet Pipe
(1) Vent Pipe
(1) Intake/Vent Concentric “Y”
Pipe and ttings are required to complete installation (user supplied). The combustion air and vent pipe ttings must conform to
ANSI and ASTM standards D1785, F891, D2665, D2241, D2661, or F628. Pipe cement and primer must conform to ASTM standards
D2564 or D2235.
In Canada, construct all combustion air and vent pipes for this unit of CSA or ULC certied Schedule 40 PVC, PVC-DWV, or ABS-DWV
pipe and pipe cement.
MODEL INTAKE/VENT NOM.
PIPE SIZE
OVERALL ASSEM’D
LENGTH1
INTAKE PIPE OUTSIDE
DIAMETER
AIR INLET PIPE
LENGTH2
CVENT-2-EXT 2” 60” 3-1/2” 45-3/4”
1. Shipping dimension. This may be eld modied by cutting or extending both the intake and exhaust pipes. 12” is the
minimum allowable length and 60” is the maximum allowable length for this dimension. SDR-26 PVC (D2241) only may be
used for extending pipes. Do not extend pipes with Schedule 40 PVC or couplings.
2. This dimension will change if the intake/vent pipes are lengthened or shortened.
Figure 1–Vent Terminal Assembly
Assembled Terminal
“Y” Concentric Fitting
3” diameter
air inlet pipe
2” diameter
vent pipe
Combustion
air inlet cap
Figure 2–Typical Roof Installation
Vent
Combustion Air
Maintain 12”
minimum (18” for
Canada) clearance
above highest anticipated
snow level. maximum of 24”
above roof.
Some local code inspectors are not familiar with
concentric vents. Be sure to check local code
requirements and acceptability prior to installation.
NOTICE:
Do not use the Extended Concentric Vent kit for anything
other than a Category IV furnace. One Extended Concentric
Vent Kit can be used for each furnace. Failure to follow this
warning could result in re, personal injury or death.
WARNING:

Vertical Roof Mounting
NOTE: Roof mounting is recommended as it allows less intake air contaminants and reduces ground-level exhaust.
1. Use furnace installation instructions to determine pipe diameter.
2. Determine correct Extended Concentric Vent size for the pipe diameter selected.
3. Determine the best location for the Extended Concentric Vent.
4. Cut a 4” diameter hole for CVENT-2-EXT, 2” kit.
5. Partially assemble Extended Concentric Vent kit. Follow furnace installation instructions for cleaning and cementing.
a. Cement “Y” tting to larger diameter air inlet pipe (Figure 1).
b. Cement combustion air inlet cap to smaller diameter pipe (Figure 1).
6. Install “Y” tting and pipe assembly through hole and roof boot/ashing (user supplied).
7. Secure to roof (Figure 3) using metal strapping or equivalent support material (user supplied).
8. Install combustion air inlet cap and small diameter pipe assembly into roof. Cement and bottom small diameter pipe in “Y”
concentric tting.
9. Cement furnace combustion air and vent pipes to Extended Concentric Vent. Refer to Figure 3 for proper pipe attachment.
10. Check installation by allowing furnace to run through one cycle.
NOTE: Keep assembly free of insulation during installation.
NOTE: Multiple Extended Concentric Vent kits may be installed vertically following the same clearances between vent outlets as
shown in Figure 6.
NOTE: Termination height must be above roof surface or anticipated snow level (minimum 12” in U.S . or minimum 18” in Canada)
as shown in Figures 2 & 3.
Do not use eld supplied couplings to extend pipes.
CAUTION:
Figure 3–Typical Roof Install
Maintain 12” minimum (18” for Canada) clearance above highest
anticipated snow level. maximum of 24” above roof.
Vent Combustion Air
Roof weather
Seal/Flashing
(eld supplied)
Combustion Air
Support
(eld supplied)
Elbow
(eld supplied)
Max 60”

Horizontal Sidewall Mounting
NOTE: Refer to the following items before horizontal
installation:
• Check furnace installation instructions for allowable clearances and locations.
• Refer to Figures 4 & 6 when venting multiple units using multiple Extended Concentric Vents.
• Avoid locations with high winds.
• Avoid locations where Extended Concentric Vent is likely to be damaged.
• Avoid locations where vapors are objectionable, or may damage the structure, plants or air conditioning condensing unit.
1. Use furnace installation instructions to determine pipe diameter.
2. Determine correct Extended Concentric Vent size for the pipe diameter selected.
3. Determine the best location for the Extended Concentric Vent.
4. When installing multiple Extended Concentric Vents, refer to the following guidelines:
a. Do not install multiple Extended Concentric Vents directly above one another unless separated by a 3’ distance (minimum).
b. Install multiple Extended Concentric Vents where the horizontal distance between the ends of each air intake is 4” or less or
greater than 24”. This will prevent a recirculation of ue gas.
5. Cut a 4” diameter hole for CVENT-2-EXT, 2” kit.
6. Partially assemble the Extended Concentric Vent kit. Follow furnace installation instructions for cleaning and cementing.
a. Cement “Y” tting to larger diameter air inlet pipe (Figure 1).
b. Cement combustion air inlet cap to smaller diameter pipe (Figure 1).
7. Install “Y” tting and pipe assembly through hole.
8. Install combustion air inlet cap and large diameter pipe assembly. Cement and bottom small diameter pipe in “Y” concentric
tting.
9. Secure to structure (Figure 7) using metal strapping or equivalent support material (user supplied).
10. Cement furnace combustion air and vent pipes to Extended Concentric Vent. Refer to Figure 7 for proper pipe attachment.
11. Check installation by allowing furnace to run through one cycle.
Figure 4–Sidewall Termination for Multiple
Vertical Extended Concentric Vents
Figure 7–Sidewall Termination Details
NOTE: Securing strap must be eld installed to prevent
movement to termination kit in side wall
Vent
Combustion air
Strap (eld supplied)
Combustion air
Vent
Elbow
(eld supplied)
1” Combustion
air inlet
vanes to wall
Max 60”
Maintain 12” clearance
abovehighest anticipated
snow level or grade
Combustion air
Vent
Roof Overhang
12” Minimum
36” Minimum
1”
Figure 5–Sidewall Termination
Combustion air
Vent
Roof Overhang
12” Minimum
1”
Maintain 12” clearance
abovehighest anticipated
snow level or grade
Figure 6–Sidewall Termination for Multiple
Horizontal Extended Concentric Vents
Combustion air
Vent
Roof Overhang
12” Minimum
1”
Maintain 12” clearance
above highest anticipated
snow level or grade
Less than 4” or greater than 24”
(between end bell edges)
Do not use eld supplied couplings to extend pipes.
CAUTION:
NOTE: Keep assembly free of insulation during installation.
NOTE: Maintain clearance dimensions as shown in Figure 4, 5, 6 & 7.
Recirculation of ue gasses may occur, causing the
intake pipe to freeze shut during cold weather
operation if the venting system is not installed per
these guidelines. If the venting system is not installed
properly, ue gas may recirculate, possibly causing
the intake pipe to freeze shut during cold weather.
WARNING: