23
INSTALLATION INSTRUCTIONS
Replace the front cover panel on the water heater.
Turn on the gas and water to the water heater by
opening the shut-off valves.
NOTICE:
To use 3" vent pipe, an increasing adapter will be
required.
WARNING:
To use Category III Stainless Steel, a proper transition part
will be required to prevent flue gas from leaking.
This water heater requires the correct DIP switch
adjustments per vent length for proper operation.
Incorrect DIP switch adjustments may cause improper
water heater operation resulting in serious injury or death.
Depending on the size of pipe that is chosen for
venting the water heater, it might be necessary
to use a fitting for stepping down in pipe size, to
connect to the water heater.
All intake and exhaust venting components must
have the same diameter size. DO NOT use a
different size on the intake and exhaust venting.
It is recommend to have a vent length as short
as possible. Input rate of the water heater
decreases if there is restriction (pressure drop) in
the venting system.
The following table shows approximate input rate
reduction. Actual input rate reduction may be
different at each installation.
The unit may be vented horizontally through a
wall or vertically through the roof. Pipe runs must
be adequately supported along both vertical and
horizontal runs.
Maximum unsupported span is recommended to
be no more than 4 feet (1.2 m). It is imperative
that the first hanger be located on the horizontal
runs immediately adjacent to the first 90-degree
elbow from the vertical rise. Only use support
isolation hanging bands. DO NOT use wire to
support pipe runs.
Stress levels in the pipe and fittings can be
significantly increased by improper installation.
If rigid pipe clamps are used to hold the pipe in
place, or if the pipe cannot move freely through
a wall penetration, the pipe may be directly
stressed, or high thermal stresses may be
formed when the pipe heats up and expands.
Install accordingly to minimize such stresses.
Venting for Direct-Vent Water Heater
5
6
Venting
Setting Vent Size Min Vent Length Max Vent Length
A-0
3" 0% 5%
2" --- ---
A-1
3" 5% 10%
2" 5% 10%
A-2 2" 15% 20%
A-3 2" 20% 25%
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