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27).
6. When installation of the termination is complete install necessary
piping and fittings to route the vent piping back to the water
heater.
7. The vent pipe shall be supported properly to avoid bending or
failure. The water heater manufacturer recommends that the
vent pipe be supported every five feet (152 cm) of vertical run
and every three feet (91 cm) of horizontal run.
8. Do not install the vent piping in a manner that will allow water
to be trapped in the piping.
Pipe (field supplied)
4" x 3" Reducer
or 3" x 2" Reducer
(field supplied),
if needed
3" Pipe
(field supplied)
Exhaust Elbow
Vent Connection
(factory installed)
Figure 17. Vent (Exhaust) Connection
9. All vent (exhaust) pipes shall be pitched a minimum of a 1/4
inch per foot back to the water heater (to allow drainage of
condensate).
10. If installing three-inch vent pipe, connect the vent pipe to the
exhaust elbow on the water heater.
11. If installing two- or four-inch pipe, transition to three-inch pipe
at the exhaust elbow on the water heater as shown in
(page 24). The field installed three-inch pipe between the
17
exhaust elbow and the reducer coupling should be 18 inches
(45 cm) or less in length.
DIRECT VENT INSTALLATION
1. Read the
General Venting Instructions
Requirements on page 22
before proceeding. These instructions and requirements must
be followed in addition to the instructions below that are specific
for Direct Vent configurations.
2. Determine which Direct Vent arrangement will be used for the
installation. There are seven Direct Vent arrangement options.
See
through
Figure 44
Figure 50
3. Determine vent and intake air pipe size to be used for the
installation. See
Venting Requirements
4. Plan the layout of the vent and intake air piping backwards from
the termination point outdoors to the water heater. Layout the
vent and intake air piping to use a minimum of pipe and elbows.
5. Install the terminations first.
• If standard terminations are being used and the intake
air or vent piping will terminate vertically, through a
roof, see
Vertical Termination Installation
• If standard terminations are being used and the intake
air or vent piping will terminate horizontally, through
a sidewall, see
Sidewall Termination Installation
27).
• If a concentric termination(s) will be used see
tric Termination Installation Preparation
• If a low-profile termination will be used see
Vent Termination installation
6. When installation of the termination(s) is complete Install
necessary piping and fittings to route the intake air and vent
(page 21) and Venting
(page 22)
Venting Requirements
(page 35)
(page 22).
(page 25).
(page
Concen-
(page 30).
Low-Profile
(page 34).
piping back to the water heater.
7. The intake air and vent piping shall be supported properly
to avoid bending or failure. The water heater manufacturer
recommends that the vent and intake air piping be supported
every 5 feet (152 cm) of vertical run and every 3 feet (91 cm)
of horizontal run.
8. Do not install the vent or intake air piping in a manner that will
allow water to be trapped in the piping.
9. A field supplied condensate Tee fitting and drain hose shall
be installed in the intake air piping near the water heater in
colder climates with heavy snow accumulations and in areas
that regularly experience high humidity. The drain hose should
be routed to an adequate floor drain separate from any other
condensate drains. See
Note: Snow being pulled into the intake air piping and
then melting can lead to excessive amounts of
water accumulation and damage water heater
components. Warm, humid outdoor air can lead to
excessive condensation inside the intake air piping
and may also damage water heater components.
10. The intake air and vent (exhaust) piping must be pitched a
minimum of a 1/4 inch per foot back to the water heater (to
allow drainage of condensate).
11. If installing three-inch vent pipe connect the vent pipe to the
exhaust elbow on the water heater.
12. If installing two- or four-inch vent pipe, transition to three-inch
pipe at the exhaust elbow on the water heater as shown in
(page 24). The field installed three-inch pipe between the
17
exhaust elbow and the reducer coupling should be 18 inches
(45 cm) or less in length.
13. Ensure the Intake Air Screen on the Intake Air Connection to
the water heater is removed before connecting the intake air
Figure
pipe to the water heater. See
Breathing Hazard - Carbon Monoxide Gas
Breathing carbon monoxide can cause brain damage or
death. Always read and understand instruction manual.
Note: Do not leave the screen inside the Intake Air
Connection for Direct Vent installations. Once the
intake air pipe is installed the screen will be hidden
from view and may become clogged with debris over
time. This will cause improper combustion and may
also lead to Blocked Intake Air fault conditions and
associated control system lock outs.
INTAKE AIR
SCREEN
(remove for Direct Vent)
14. If installing three-inch intake air pipe connect the intake air pipe
to the intake air connection on the water heater.
15. If installing two- or four-inch intake air pipe, transition to three-
inch pipe at the intake air connection on the water heater as
shown in
Figure 19
the intake air connection and the reducer coupling should be
24
(page 25).
Figure 20
(page 24).
Figure 18
Do not obstruct water heater air intake.
Gas and carbon monoxide detectors
are available.
Install water heater in accordance with
the instruction manual.
Figure 18. Intake Air Screen
. The field installed three-inch pipe between
Figure
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