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6.
Exhaust piping installation
Reference to installation
Screened outlet
Joint
Elbow
Straight pipe
Elbow
Water
heater
4" diameter pipe
Schematic illustration
5.
Installation
Work
1. Drill holes for tapping screws, secure the tapping
screws temporarily on the wall, and hang the mount-
ing board (upper side) on the tapping screws.
2. Determine the screw positions (two at the top and
bottom respectively), and take off the equipment.
Item
3. Drill holes at the screw positions on the wall.
4. Hang the equipment again on the tapping screws
secured temporarily, and tighten the tapping screws
(two at the upper and lower sides respectively).
Install the water heater firmly so it will not turn over,
get damaged or broken due to the shocks of earth-
quakes or vibrations.
Note
Be careful of injuries when you need to work with
bare hands.
Be careful of electric wiring, and gas and water pip-
ing inside the house while drilling holes.
Location of screw hole
Installation must conform with local codes, or in the absence of local codes, the National Fuel Gas
Code, ANSI Z223.1/NFPA 54. A heavy load will be applied to the wall on which the water heater is
mounted. If the strength of the wall is not sufficient, reinforcement will be necessary.
Take care not to drop the water heater, or otherwise damage it.
The internal parts can be damaged and cause a danger of accident.
Be sure to mount the water heater on an upright wall.
Securing to the wall
Mounting
Water heater and building structure
Mounting board
(upper)
Location of screw hole
Tapping screw
Min: 1"
Insulation material
Building (Covered with
metal wooden screw)
1. Use only listed category III vent pipe with this
water heater.
2. Follow the vent pipe manufactures installation in-
structions.
3. Apply commercial silicon seal at the joints (joint
of exhaust pipe and adapter, joint of adapter and
exhaust pipe).
* See below for max. vent length.
Sealer
Installation of exhaust vent and end of pipe
Discharge the exhaust gas outside
using the extension sold separately.
Make the vertical section at the exhaust vent
as short as possible.
Maintain the same vent pipe diameter all the
way to the end.
Use only listed category III vent materials.
Make sure vent pipe is gas tight and will not
leak.
Do not place any dangerous objects at the end
of the exhaust vent.
Steam (smoke) or water drops may come out
from the end of the exhaust pipe. Select the
location for the end of the vent so that steam
is not visible, and the vent is not wet with drip-
ping water.
If snow is expected to accumulate, take care
the end of the pipe is not covered with snow
or hit by falling lumps of snow.
Preparation before installation
Exhaust pipe diameter and limit length
Check that the length from the installation loca-
tion of the water heater to the end of vent is within
the specified maximum distance.
* If this limit is exceeded, explosion may occur.
Be sure the vent pipe directs exhaust to the out-
side of the building.
Avoid firewalls when determining the route for
installing the exhaust pipe.
Do not mount a fireproof damper on the exhaust
pipe.
* The shortest vent length is
1 meter with a bend.
(The end of exhaust pipe
is not included as a bend.)
Avoid the installation
shown in the illustration on
the right
Exhaust hood
Water
heater
Pipe diameter
4"
Limit of exhaust
15 feets with 3 bends
vent length
(Except the end of pipe)
(A bend is equivalent to 12 feets straight pipe.)
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