Installation Manual
Installation
10│Page
Improperventingofthisappliancecanresultinexcessivelevelsofcarbonmonoxide
whichcanresultinseverepersonalinjuryordeath.
Wheninstallingtheventsystem,allapplicablenationalandlocalcodesmustbe
followed.Ifyouinstallthimbles,firestopsorotherprotectivedevicesandthey
penetrateanycombustibleornoncombustibleconstruction,besuretofollowall
applicablenationalandlocalcodes.
T‐H2‐DVINSTALLATION
T‐H2‐DV is equipp ed 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 prev ent heat damage to PVC
(Plastic)ventingifPVCisused.
If the exhaust gas temperature exceeds 140°F, these components will enable the unit to safely sto p
operations.(For the T‐H2‐OS model, these components are not available since there’s no exhaust
ventingrequired.)
• T‐H2‐DVrequiresa4”make‐upintakeairsupply
pipe.Theintakepipemustbesealedairtight.
• Air supply pipe can be made of ABS, PVC,
galvanized steel, corrugated stainless steel,
orCategorylll/IVstainlesssteel.
• Sidewall ventingis recommended for
the T‐H2
‐DV. Vertical venting (roof
termination)isacceptable.
• TAKAGI recommends running the
exhaust vent and the intake pipe as
parallelaspossible.
• TheTH‐PA01adaptorisusedtomake
theconnectionbetween theT‐H2‐DV
vent collar and PVC vent pipe easier
andformaintenancepurposes.
VENTINGINSTRUCTIONS
‐General‐
TheT‐H2‐DVmustbeventedinaccordancewiththesection“VentingofEquipment"ofthelatestedition
of the Natural Fuel Gas Code: The ANSI Z223.1, All applicable local building codes, Section 7 of the
CAN/CSAB149.1NaturalGasinCanada,PropaneInstallationCodeinCanada.
The use of venting materials approved for Category III/ IV appliances is recommended whenever
possible. However, T‐H2‐DV may also be vented with plastic pipe materials such as PVC. For details ,
pleaserefertotheExhaustVent(PVCVent)sectiononp.13.VentinstallationsinCanadawhichutilize
plastic
ventsystemsmustuseventingthatcomplieswithULCS636.
WARNING
Top12”
Side3”
Back0.5”
Side3”
Front4”
(24”Recommended
forMaintenance)
Bottom12”
Keeptheclearances.