Installation; General - Takagi T-H3S-DV Installation Manual And Owner's Manual

INSTALLATION

1. Follow all local codes, or in the absence of local codes, follow the most recent edition of the National
Fuel Gas Code: ANSI Z223.1/NFPA 54 in the USA or CAN/CSA B149.1 Natural Gas, 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
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. Make sure the vent termination meets the required distance by
local code from any doorway or opening to prevent exhaust from entering a building. (Refer to p. 22.)
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 environment.
9. The 240 Indoor (T-H3J-DV), 340 Indoor (T-H3S-DV), and 540 Indoor (T-H3-DV) are to be installed
indoors only. These units are equipped with a thermistor and hi-limit switch for the exhaust gas,
detecting excess temperatures within the flue and enabling the unit to safely stop operations if
needed. These components are always monitoring exhaust gas conditions in order to prevent heat
damage to ABS, PVC, CPVC, or polypropylene (Plastic) venting if ABS, PVC, CPVC, or polypropylene
is used. If the exhaust gas temperature exceeds 140 °F, these components will enable the unit to
safely stop operations. These components are not installed on the outdoor models since the exhaust
vent is built-in.
• The Indoor model requires a 3 in. or 4 in. make-up intake air supply pipe. The intake pipe must
be sealed airtight.
• Air supply pipe can be made of ABS, PVC, CPVC, polypropylene, corrugated stainless steel, or
Category lll / IV stainless steel. Regarding exhaust pipe, refer to p. 13 and 15.
• Sidewall venting is recommended for the Indoor model. Vertical venting (roof termination) is
acceptable.
• The manufacturer recommends running the exhaust vent and the intake pipe as parallel as possible.
10. The 240 Outdoor (T-H3J-OS), 340 Outdoor (T-H3S-OS), and 540 Outdoor (T-H3-OS) models only to be
installed outdoors and only in the area with mild, temperate climates.
The Outdoor model shall be wall-mounted or mounted on a stand. Locate the Outdoor model in an
open, unroofed area and maintain the following minimum clearances:
There is a 2 in. clearance from the left and right sides of the unit to combustible and
non-combustible surfaces.

GENERAL

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Installation Manual
Installation