Venting Through An Existing System - Westinghouse Premium WGRT 199 Series Installation, Start-Up, Maintenance, Parts, Warranty

2. Venting Through an Existing System

This heater may be vented through an existing unused vent system.
The inner diameter of the existing vent system is utilized for the
combustion air source. Two methods have been approved for such
venting: Concentric Venting Through an Existing System and Venting
as a Chase.
Do not install the heater into a common existing vent with any other
appliance. This will cause flue gas spillage or heater malfunction,
resulting in substantial property damage, serious personal injury, or
death.
Contractors must check state and local codes before installing
through an existing vent opening. State and local codes always take
precedence over manufacturer's instructions. Failure to check state
and local codes before installing through an existing opening could
result in property damage and add significantly to installation costs.
If an existing venting system is converted for use with this heater, the
installer must ensure that the existing venting system is clean and
free from particulate contamination that could damage the heater.
Failure to do so could result in property damage and heater failure.
Such failure IS NOT covered under warranty.
Concentric Venting Through an Existing System
NOTE: The following instructions refer only to venting through
an existing vent system, and not to venting with Westinghouse's
optional concentric vent kits. Refer to Concentric Vent Kit installation
manual (LP-166) for further information on venting with the optional
Concentric Venting through an Existing System
1
EXHAUST
SEAL
EXISTING
SEALED
CAP
SEAL
Figure 26 - 1, 2 - Concentric Venting Through an Existing System, 3, Chase Venting Through an Existing System
NOTE: These drawings are meant to demonstrate system venting only. The installer is responsible for all equipment and detailing required
by local codes.
Concentric Venting through an Existing System
2
EXHAUST
COMBUSTION
AIR
EXISTING
SEAL
AIR INTAKE
(w/SCREEN)
SEAL
LP-325-LL
03/15/12
concentric vent kits.
Concentric venting through an existing system must run vertically
through the roof. See Table 19 for proper minimum vent sizing. Use
only the approved venting materials specified in Table 14 for piping
the system. All instructions listed in this Venting section apply. See
Figures 26-1 and 26-2 for venting demonstrations.
Vent / Air Inlet Size
2"
3"
4"
Table 19 - Minimum Existing Vent / Chase Sizing
The upper and lower vent terminations as well as all joints in
the venting system must be properly sealed to ensure that all
combustion air is drawn properly and exhaust does not leak from
the system. Failure to properly seal the venting system will result
in property damage, serious personal injury, or death.
Chase Venting Through an Existing System
When venting as a chase, follow all instructions included in this
Venting section, including those in the previous Concentric Venting
Through an Existing System section. See Figure 26-3 for chase
venting demonstration.
SEAL
COMBUSTION AIR
AIR INTAKE
w/SCREEN
12" MIN.
SEALED CAP
LP-325-MM
03/15/12
Minimum Existing Vent / Chase Size
4"
5"
7"
Chase Venting through an Existing System
3
EXHAUST
24"
INTAKE
SEAL
EXISTING
VENT
SEAL
CAP
whl-004 Rev. 000 Rel. 013 Date 5.1.18
33
LP-325-NN
07/22/13