23
If a concentric termination(s) will be used see Concentric
Termination Installation on page 29.
If a low-profile termination will be used see Low Profile Vent
installation on page 33.
6. When installation of the termination(s) is complete Install
necessary piping and fittings to route the intake air and vent
piping back to the water heater.
7. The intake air and vent piping must 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
should 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 Figure 20
on page 24.
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 3 inch vent pipe connect the vent pipe to the
exhaust elbow on the water heater.
12. If installing 4 inch vent pipe transition to 3 inch pipe at the
exhaust elbow on the water heater as shown in Figure 17 on
page 23. The field installed 3” pipe between the exhaust
elbow and the 4” x 3” 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
pipe to the water heater. See 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.
Breathing carbon monoxide can cause brain damage or
death. Always read and understand instruction manual.
Breathing Hazard - Carbon Monoxide Gas
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.
If the vent piping will terminate vertically, through a roof, see
Vertical Termination Installation on page 24.
If the vent piping will terminate horizontally, through a
sidewall, see Sidewall Termination Installation on page 26.
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 must be supported properly to avoid bending
or failure. The water heater manufacturer recommends that
the vent pipe 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 piping in a manner that will allow water
to be trapped in the piping.
3” PIPE FIELD
SUPPLIED
EXHAUST ELBOW
VENT CONNECTION
FACTORY INSTALLED
4” PIPE FIELD
SUPPLIED
4” x 3” REDUCER
FIELD SUPPLIED
VENT (EXHAUST) CONNECTION
Figure 17
9. All vent (exhaust) pipes must be pitched a minimum of a
1/4 inch per foot back to the water heater (to allow drainage
of condensate).
10. If installing 3 inch vent pipe connect the vent pipe to the
exhaust elbow on the water heater.
11. If installing 4 inch pipe transition to 3 inch pipe at the exhaust
elbow on the water heater as shown in Figure 17. The field
installed 3” pipe between the exhaust elbow and the 4” x 3”
reducer coupling should be 18 inches (45 cm) or less in length.
DIRECT VENT INSTALLATION
1. Read the General Venting Instructions on page 20 and
Venting Requirements on page 21 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 (7) Direct Vent arrangement
options. See Figures 44 through 50.
3. Determine vent and intake air pipe size to be used for the
installation; see Venting Requirements on page 21.
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 on page 24.
If standard terminations are being used and the intake air or
vent piping will terminate horizontally, through a sidewall, see
Sidewall Termination Installation on page 26.
