Installation; General - Takagi AT-KJr3U-IN Installation Manual And Owner's Manual

INSTALLATION

1. Follow all local codes, or in the absence of local codes, follow the current edition of the National Fuel
Gas Code: ANSI Z223.1/NFPA 54 in the USA or B149.1 Natural Gas and Propane Installation Code in
Canada.
2. All gas water heaters require careful and correct installation to ensure safe and efficient operation.
This manual must be followed exactly. Read the "Safety Guidelines" section.
3. The manifold gas pressure is preset at the factory. It is computer controlled and should not need
adjustment.
4. Maintain proper space for servicing. Install the unit so that it can be connected or removed easily.
Refer to the "Clearances" section on p. 9 for proper clearances.
5. The water heater must be installed in a location where the proper amount of combustible air will be
available to it at all times without obstructions.
6. The electrical connection requires a means of disconnection, to terminate power to the water heater.
This is necessary for servicing and safety purposes.
7. Do not install the unit where the exhaust vent is pointing into any opening in a building or where the
noise may disturb your neighbors. Ensure that the vent termination meets the minimum distance
requirements set by code, including minimum clearances from doorways or openings. (Refer to pp.24
and 25.)
8. Particles from flour, aerosols, and other contaminants may clog the air vent, build up and reduce
the functions of the rotating fan, cause improper burning of the gas, or cause damage to the water
heater. Regularly ensure that the area around the unit is dust- or debris-free. Regular maintenance is
recommended for these types of environments. Direct Venting is recommended.
9. For 110U Indoor (AT-KJr3U-IN), 310U Indoor (AT-K5U-IN) and 510U Indoor (AT-D3U-IN) models:
• If the water heater is used as a direct-vent appliance, the unit requires a 3 in. (76 mm)
combustible air supply pipe. The intake pipe must be sealed airtight. Refer to "VENTING
INSTRUCTIONS" on p.13 for more detail.
• Terminating the venting through a sidewall is recommended for the direct-vent system.
• Running the exhaust vent and the intake pipe parallel is recommended.
• Terminating the exhaust and intake on the same wall/surface is recommended. Terminating in
the same pressure zone allows for pressure balancing, which prevents nuisance shutdowns.
• Only install the water heater in a heated area where below freezing temperatures cannot occur.
The warranty does not cover damage caused by freezing.
• The water heater must be securely mounted to a wall or other suitable structure.
10. The 110U Outdoor (AT-KJr3U-OS), 310U Outdoor (AT-K5U-OS) and 510U Outdoor (AT-D3U-OS) models
are only to be installed outdoors and only in an area with mild, temperate climates. The Outdoor
model shall be wall mounted, mounted on a stand, or installed in an approved recess box. Locate the
Outdoor model in a open, unroofed area and maintain the minimum clearances. (Refer to p.11.)

GENERAL

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Installation Manual
Installation