John-wood Takagi - 240H-340H-540H User Manual Page 1

Gas Tankless Water HeaterTMSuitable for potable water heating and space-heating Please refer to local codes for space-heating compliance.T-H3-DV model

10 PageThe pipe cover protects the plumbing pipes to the waterheater from unexpected adjustments.Thispipecoverisfixedtothebottomofthe

11 PageWARNING FOR INSTALLATIONSFOR YOUR SAFETY, READ BEFORE INSTALLATION:Do not install the heater where water, debris orflammable vapors m

12 PageHIGH-ALTITUDE INSTALLATIONSCheck the elevation where your water heater is installed.  Set DIPswitches shown in the table below

13 PageVENTING INSTRUCTIONS-General-T-H3J-DV/240H,T-H3S-DV/340H,andT-H3-DV/540Hmodelsmustbeventedinaccordancewiththesection“Ventin

14 Page-DIPswitch settings for Vent length--Exhaust vent (Plasc vent)-These models can be vented with a plastic vent which is made of PVC, CPVC, or

15 Page• The maximum length of exhaust vent piping must not exceed21.3 m (70 ft.) for76 mm (3”)venting,whichdependsontheele

16 Page<How to install plastic venting>76 mm (3") vent connecon Diagram From 76 mm (3") to 102 mm (4") vent connecon Diagram-E

17 Page-Stainless steel Vent Illustraons-<How to install stainless steel venting>• Regardingtheclearancesfromtheexhaustterminaltothe

18 Page-Vent terminaon clearances-Canada U.S.ADirect vent and other than Direct VentDirect ventOther than Direct VentAClearance above grade, verand

19 Page-For sidewall terminaons--For rooop terminaons-Formultiplesidewallexhaustterminations(e.g.multi-unitsystems),anexhausttermination

2 PageContentsCONTENTSInstallation Manual　SPECIFICATIONS ...

20 PageGAS SUPPLY AND GAS PIPE SIZING-General-• The minimum and maximum inlet gas pressures are:• Inlet gas pressure except the ranges in t

21 Page-Natural Gas Supply Piping-MaximumdeliveryCapacityofCubicFeetofGasperHourofIPSPipecarryingNaturalGaswith0.60SpecificGravi

22 Page-Measuring inlet gas pressure-Thewaterheatercannotperformproperlywithoutsufficientinletgaspressure.Belowareinstructionsonhowt

23 Page-Pressure relief valve-Thewaterheaterhasahigh-temperatureshutoffswitchbuilt inasastandardsafetyfeature(calledaHi-Limitswitc

24 Page-Condensate Drain Connecons-Thewaterheaterisahighefficiencycondensingwaterheaterthatproducescondensate(acidicwater).The acidi

25 PageELECTRICAL CONNECTIONS1. Thewaterheaterrequires120 VAC, 60 Hz electrical power supply that is properly grounded.2. Theuseofasurgepr

26 PageEASY-LINK SYSTEM(Available on the T-H3-DV / 540H Indoor only)TheT-H3-DV/540Hwaterheaterscanbeconnectedwithallowableheaters(seeth

27 Page2. Select one unit to be the “PARENT” unit.3. “PARENT” unit : LocatethetwobanksofDIPswitchesatthebottomleftofthecomputerb

28 Page(C) Examples of incorrect settings and /or connections CASE 1: Wrong DIPswitch setting on the "PARENT" unit CASE 2: Wrong

29 PageCASE 3: Wrong connections between the "CHILD-1" unit and the "CHILD-2" unit• If you connect the “PARENT” connector of the

3 PageInstallaon ManualInstallation ManualCONGRATULATIONSCongratulationsandthankyouforchoosingourtanklesswaterheater.Beforeuse,wereco

30 PageMULTI-UNIT SYSTEMMultipleT-H3-DV/540Hunitscanbecombinedforamulti-unitsystem,alongwiththemulti-unitcontroller(TM-MC02).Them

31 PageAPPLICATIONS-Space-Heang Applicaons--Recirculaon-*The recirculation pump is to be controlled by:-Dual-set aquastat (recommended w/timer)*Th

32 PageINITIAL OPERATIONInstallaonInstallaon ManualIF YOU SMELL GAS:• Donottrytostartthewaterheater.• Donottouchanyelectricswitches;

33 PageOwner's GuideCONGRATULATIONSCongratulationsandthankyouforchoosingourtanklesswaterheater.Beforeuse,werecommendthatyourea

34 PageOPERATING SAFETYFOR YOUR SAFETY READ BEFORE OPERATINGA. Thiswaterheaterdoesnothaveapilot.Itisequippedwithanignitiondevicethat

35 PageDANGERVapors from flammable liquids will explode and catch fire causing death or severe burns. Do not use or store flammable products s

36 PageNormal OperaonOwner's GuideNORMAL OPERATIONTEMPERATURE CONTROLLER and REMOTE CONTROLLERTheillustraonbelowshowsanexampleoftheco

37 PageTEMPERATURE SETTINGS-Set temperature-TEMPERATURE TABLE OF CONTROLLERNormal OperaonOwner's Guide°C 38 40 43 45 50* 52 55 57 60°F 100 10

38 PageADDITIONAL FEATURESYoucangetsomeinformationaboutthewaterheaterconditionbypressingthe"INFO" button. For more informatio

39 PageTEMPERATURE SETTINGS ON THE PCB(WITHOUT REMOTE CONTROLLER)Thereare2presettemperatures(49°C(120 °F) and 60°C(140 °F))that you can s

4 PageSPECIFICATIONS*275790pa(40psi)oraboveisrecommendedformaximumflow.**TheManifoldPressureisthefactorysettingandgenerallyshoul

40 PageFLOW• Thisunitcomesequippedwithheatingblockstoprotectitagainstdamagesassociatedwithfreezing.• Forthisfreezeprotectionsyst

41 PageMAINTENANCE AND SERVICE• Cleanthecold-waterinletfilter.(Refertodiagrambelow.)• Besurethatallopeningsforcombustionandventil

42 PageTROUBLESHOOTINGGENERALPROBLEM SOLUTIONSTEMPERATURE and AMOUNT OF HOT WATERIt takes long time to gethotwateratthefixtures.• The time it

43 PagePROBLEM SOLUTIONSWATER HEATERUnit does not ignite whenwatergoesthrough the unit.• Istheflowrateover1.9L/min(0.5GPM)?(p.36)• Che

44 PageERROR CODES-General-• Theunitsareself-diagnosticforsafetyandconveniencewhentroubleshooting.• If there is a problem with the

45 Page-Fault Analysis of Error Codes-Iftheerrorcode is displayed onthecomputerboardof the waterheaterorremotecontrollerand/ortempe

46 PageTroubleshoongOwner's GuideRemoteGreen LEDMalfunctiondescriptionDiagnosis391TwoTimes Air-fuel ratio rod failure• Checkforconnection/b

47 PageCOMPONENTS DIAGRAMCase assembly Temperature remote controller724723722056Temperature controllerComponents DiagramOwner's Guide0520520

48 PageT-H3-DV / 540HT-H3J-DV / 240H and T-H3S-DV / 340HComputer board assemblySurge box assembly1217137037060637090537037107017131037094027077087147

49 PageComponents DiagramOwner's GuideBurner assembly1011041151061071081101091117121120620530537090534011031050650541131141027081191511180550511

5 PageINTRODUCTION• This manual provides information necessary for the installation, operation, and maintenance ofthewaterheater.• Themodeldes

50 PageComponents DiagramOwner's GuideWater Way assembly402460456461458404417407454405457406410455408458454462CD052059052409417Water outlet sec

51 PagePARTS LISTItem # Description Part #001002Case assembly for Indoor modelsFront cover for T-H3J-DV / 240H and T-H3S-DV / 340H

52 PageParts ListOwner's GuideItem # Description Part #116117118119PressureportCombustion chamber tubeGas inletGas inlet ringEKK2DEX019EK117EX

53 PageParts ListOwner's GuideItem # Description Part #462463464465Fastener“16-25A”Fastener“6-15”Flat heaterDrain tubeEKK39EX12KEK217EK21846

54 PageOUTPUT TEMPERATURE CHARTChart is based on properly sized gas lineT-H3J-DV / 240HOutput Temperature ChartOwner's GuideT-H3S-DV / 340H*Whe

55 Page1. Generaltermsoflimitedwarranty: Thislimitedwarrantygivesyouspecificlegalrights,andyoumayalsohaveotherrightswhichvary

56 Page    (3)LimitedLaborCoverage•Themanufacturerwillprovideforreasonablelaborchargesassociatedwithwarranty

57 PageNOTES

58 PageNOTES

59 PageNOTES

6 PageSAFETY GUIDELINESSAFETY DEFINITIONGENERAL 1. Followalllocalcodes,orintheabsenceoflocalcodes,followthemostrecenteditionofCSA

60 PageIf you have any questions, please call 1-888-479-8324

7 PageINSTALLATIONGENERAL1. Followalllocalcodes,orintheabsenceoflocalcodes,followthemostrecenteditionofCSAB149.1NaturalGas,Prop

8 PageINCLUDED ACCESSORIESOPTIONAL ITEMS• Installation and service must be performed by a qualified installer (for example, a licensed plumber or ga

9 PageMaintain all clearances around thewaterheater.CLEARANCESInstallaonInstallaon ManualINCLUDED ACCESSORIESCheckthattheseitemsbelowarei