Takagi T-H3J-DV - INSTALLATION; GENERAL

7 Page
INSTALLATION
GENERAL
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.20.)
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. (For the Outdoor model, these components are not available since there’s
no exhaust venting required.)
•TheIndoormodelrequiresa3"or4”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.
•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3”clearancefromtheleftandrightsidesoftheunittocombustibleandnon-combustible
surfaces.
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