Takagi T-K3-OS Installation Manual And Owner'S Manual Download Page 2

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-In accordance with ANSI Z21.10.3 and SCAQMD
Rule 1146.2, CO emission does not exceed 400 PPM
for normal input.

CONTENTS

*50 psi or above is recommended for maximum flow

NOTE

-Check the rating plate to ensure this product
matches your specifications.

SPECIFICATION

T-K3-OS and T-K3-SP

Natural Gas Input

(Operating Range)

Min: 11,000 Btu/h

Max: 190,000 Btu/h

LPG Input

(Operating Range)

Min: 11,000 Btu/h

Max: 190,000 Btu/h

Gas Connection

¾” NTP

Water Connections

¾” NTP

Water Pressure

15 - 150 psi*

Natural Gas Pressure
Inlet

Min. 5.0” WC

Max. 10.5” WC

LP Gas

Pressure Inlet

Min. 8.0” WC

Max. 13.5” WC

Manifold Pressure of
the

T-K3-OS

Natural: 2.8” WC

Propane: 3.1” WC

Manifold Pressure of
the

T-K3-SP

Natural: 2.4” WC

Propane: 4.1” WC

Weight

40 lbs.

Dimensions

H20.5” x W13.8” x D8.5”

Ignition

Electric Ignition

Supply

120VAC (60Hz)

Operation

92 W

Standby

6.2 W

Consumption
of the

T-K3-

Freeze-
Protection

111 W

Operation

92 W

Standby

6.2 W

Electric

Consumption
of the

T-K3-

Freeze-
Protection

111 W

SPECIFICATIONS……………………...

INTRODUCTION…………………….…

SAFETY GUIDELINES…………….…..

INSTALLATION……………………..….

General…………………………….…

Accessories…………………………..

Outdoor Installation………………….

Indoor Installation…………………....

Venting Instructions

(T-K3-SP ONLY)

…

Gas Supply / Gas Pipe Sizing…...…

Water Connections……………..……

Pressure Relief Valve…………….…

Electrical Connections……………....

Remote Controller Connection…..…

Initial Operation………………………

NORMAL OPERATION…………..……

Normal Operation…………………...

Flow………………………………...…

Freeze Protection System …………

Temperature Setting ………………..

Maintenance and Service…………..

TROUBLESHOOTING…………………

WIRING DIAGRAM…………………….

OPERATING SAFETY…………………

APPLICATIONS………………………..

Space Heating……………………….

Dual-Purpose Heating………………

Re-Circulation ……………………….

OPTIONAL ITEMS……………………..

COMPONENTS DIAGRAM &

PARTS LIST……….

OUTPUT TEMPERATURE CHART….

WARRANTY ……………………………

Manufacturer reserves the right to discontinue, or change at any time, specifications or
designs without notice and without incurring obligations.

Summary of Contents for T-K3-OS

Page 1: ...professional service technician Improper installation and or operation or installation by an unqualified person will void the warranty WARNING If the information in this manual is not followed exactly a fire or explosion may result causing property damage personal injury or death TAKAGI Industrial Co USA Inc 5 Whatney Irvine CA 92618 Toll Free 888 882 5244 USA Toll Free 877 877 4953 CANADA Flash W...

Page 2: ...z Operation 92 W Standby 6 2 W Consumption of the T K3 OS Freeze Protection 111 W Operation 92 W Standby 6 2 W Electric Consumption of the T K3 SP Freeze Protection 111 W SPECIFICATIONS INTRODUCTION SAFETY GUIDELINES INSTALLATION General Accessories Outdoor Installation Indoor Installation Venting Instructions T K3 SP ONLY Gas Supply Gas Pipe Sizing Water Connections Pressure Relief Valve Electric...

Page 3: ...ous tankless water heater designed to efficiently supply endless hot water for your needs The principle behind the T K3 OS SP Water Heater is simple 1 A hot water tap is turned on 2 Water enters the heater 3 The water flow sensor detects the water flow 4 The computer automatically ignites the burner 5 Water circulates through the heat exchanger and then gets hot 6 The computer will modulate the ga...

Page 4: ...o p 5 4 Check the rating plate for the correct GAS TYPE GAS PRESSURE WATER PRESSURE and ELECTRIC RATING If this unit does not match your requirements do not install and consult with Takagi 5 If any problem should occur turn off all hot water taps and turn off the gas Then call a trained technician or the Gas Company or the manufacturer WARNING Water temperatures over 125ºF can cause severe burns i...

Page 5: ...al sound TAKAGI does not recommend installing the unit on a wall adjacent to a bedroom or a room that is intended for quiet study or meditation etc Locate your heater close to a drain where water leakage will not do damage to surrounding areas As with any water heating appliance the potential for leakage at some time in the life of the product does exist If there is no drain Takagi will not be res...

Page 6: ...e fan and burner causing damage to the unit Particles from flour aerosols and other contaminants may reduce the functions of the rotating fan and cause improper burning of the gas Regularly ensure that the area around the unit is dust or debris free regular maintenance is recommended for these types of environment 5 Do not install the unit where the exhaust vent opening is pointing into any openin...

Page 7: ...ocate the bank of dipswitches at the bottom right corner of the computer board The OUT dipswitch on the computer board should be switched to ON up For the T K3 OS no dipswitches need to be changed 4 The outdoor vent cap must be used when the T K3 SP is installed outdoor Takagi requires the use of its part No TK TV04 5 When installed outdoors the T K3 OS SP water heater shall be wall mounted only L...

Page 8: ...eater under an overhang less than 3 feet from its top or eaves The area under an overhang must be open to three sides Do not install the water heater vent terminator within 1 ft in the USA of any air intake or building opening and with in 3 ft in Canada of any air intake or building opening Refer to p 13 Avoid locating the water heater exhaust opening near any air intake devices These fans can pic...

Page 9: ...plied from outside the building an opening communicating directly with the outside should have a minimum free area of one square inch per 15 000 BTUH input of the total input rating of water heater in the enclosed area When combustion air is supplied from inside the building an opening communicating with the rest of the dwelling should have a minimum free area of one square inch per 1 000 BTUH inp...

Page 10: ...structions when installing the vent pipe 4 Do not common vent this appliance with any other vented appliance Do not terminate vent into a chimney If the vent must go through the chimney the vent must run all the way through the chimney with Category III approved or Special BH vent pipe 5 The maximum length of exhaust vent piping must not exceed 50 ft deducting 5 ft for each elbow used in the venti...

Page 11: ...e vent pipe to the water heater collar 4 Do not cut the vent collar of the unit 5 The weight of the vent stack must not rest on the water heater 6 The vent must be easily removable from the top of the water heater for normal service and inspection of the unit 7 The water heater vent must not be connected to any other gas appliance or vent stack 8 Avoid locating the water heater vent terminator nea...

Page 12: ...t page Install a condensation drain in the venting Follow the vent system to vent manufacturer s instruction and local code Do not common vent or connect any vent from other appliances to the T K3 SP vent Use 4 category III approved or Special BH single or double wall stainless steel vent pipe ...

Page 13: ...side corner H Clearance to each side of center line extended above meter regulator assembly 3 feet I Clearance to service regulator vent outlet 3 feet J Clearance to non mechanical air supply inlet to building or the combustion air inlet to any other application 3 feet 1 foot 4 feet from below or side opening 1 foot from above opening K Clearance to mechanical air supply inlet 6 feet 3 feet 3 feet...

Page 14: ...ing conditions and damage to the unit 4 Until testing of the main gas line supply pressure is completed ensure the gas line to the T K3 OS SP is disconnected to avoid any damage to the water heater MEASURING INLET GAS PRESSURE The T K3 OS SP cannot perform properly without sufficient inlet gas pressure Below are instructions on how to check the inlet gas pressure THIS IS ONLY TO BE DONE BY A LICEN...

Page 15: ...vity Based on Pressure Drop of 0 5 WC Based on Energy Content of 1100 BTU Cubic Ft T K3 OS SP requires 173 Cubic Ft hr Unit Cubic feet per Hour Pipe Size Length in Feet inches 10 20 30 40 50 60 70 80 90 100 125 150 200 363 249 200 171 152 138 127 118 111 104 93 84 72 1 684 470 377 323 286 259 239 222 208 197 174 158 135 1 1404 965 775 663 588 532 490 456 428 404 358 324 278 1 2103 1445 1161 993 88...

Page 16: ...lso recommended on the hot water outlet of the unit If the T K3 OS SP is installed within or subjected to a closed loop water system a thermal expansion tank must be installed 4 Before installing the water heater flush the water line to remove all debris and after installation is complete purge the air from the line Failure to do so may cause damage to the heater 5 There is a wire mesh filter with...

Page 17: ...st 190 000 BTU hr 5 The pressure relief valve needs to be rated for a maximum of 150 psi 6 The discharge piping for the pressure relief valve must be directed so that the hot water cannot splash on anyone or on nearby equipment 7 Attach the discharge tube to the pressure relief valve and run the end of the tube to within 6 from the floor This discharge tube must allow free and complete drainage wi...

Page 18: ...ring errors can cause improper and dangerous operation Verify proper operation after servicing 1 The heater must be electrically grounded Do not attach the ground wire to either the gas or the water piping 2 The FLASH T K3 OS SP water heater requires AC 120V 60 Hz electrical power supply that is properly grounded An on off switch controlling the main power to the T K3 OS SP must be provided for se...

Page 19: ... not use this water heater if any part has been submersed under water Immediately call a qualified service technician to inspect the water heater and to replace any damaged parts CAUTION IF YOU SMELL GAS Do not try to start the water heater Do not touch any electric switch do not use any phone in your building Immediately call your gas supplier from a neighbor s phone Follow the gas supplier s ins...

Page 20: ...mple 104 F The temperature options unit F 99 100 102 104 106 108 110 111 113 115 117 122 131 140 158 167 Temperature settings 140 F and above are for heating applications only 3 Open a hot water tap Mix cold water with the hot if you need 4 Close the hot water tap WARNING Hot Water temperatures over 125 F can cause severe burns instantly or death from scalding The outlet hot water temperature of t...

Page 21: ...e there has to be electrical power to the unit Damage to the heat exchanger caused by freezing temperatures due to power loss is not covered under the warranty The freeze protection system will activate when the temperature drops below 36 5 F 2 5 C and is rated to protect the unit down to 5 F 15 C in a wind free environment Do NOT install the water heater in an area where the water heater is subje...

Page 22: ...nly If you desire a hot water temperature other than the 4 preset settings please purchase the optional temperature remote controller part No TK RE02 With this optional TK RE02 you can set the temperature from 99ºF to 167ºF with various increments Please read the instructions carefully prior to installing the TK RE02 as failure to do so could damage the temperature controller and or the water heat...

Page 23: ... as necessary by a licensed technician If repairs are needed any repairs should be done by a licensed technician UNIT DRAINING and FILTER CLEANING 1 Close the manual gas shut off valve 2 Close the water shut off valve 3 Open all hot water taps in the house When the residual water flow has ceased close all hot water taps 4 Have a bucket or pan to catch the water from the unit s drain plugs Unscrew ...

Page 24: ... too high p 20 22 The hot water is not available when a fixture is opened Make sure the unit gets 120V 60Hz power supply If you are using the remote controller is the power button turned on p 20 Is the gas supply valve fully open p 19 Is the water supply valve fully open p 19 Is the filter on cold water inlet clean p 23 Is the hot water fixture sufficiently open to draw at least 0 5 GPM through th...

Page 25: ...everse connection and cross connection If you use the remote controller is the power button turned on p 20 The fan motor is still spinning after operation has stopped This is normal After operation has stopped the fan motor keeps running from 5 to 50 seconds in order to re ignite quickly as well as purge all the exhaust gas out of the flue Abnormal sounds come from the unit Contact TAKAGI ...

Page 26: ...ate the source of the problem instead Consult the following chart for the cause of each error code Red LED TK RE02 Symptom 03 Incorrect Dipswitch Settings Blinking One Time 70 Proportional Valve Computer 31 Outlet Thermistor 32 Inlet Thermistor Blinking Two Times 39 Air fuel Ratio Rod Failure 11 Ignition Failure 12 Flame Loss 55 Abnormal Main Gas Valve 51 Abnormal Solenoid Gas Valve 72 False Flame...

Page 27: ...front panel of the appliance Electrical Rating 120 VAC 60 Hz Note If any of the original wiring supplied with this appliance must be replaced it must be replaced with appliance wiring material 180c or its equivalent Replacement wires are available through Takagi ...

Page 28: ...ician Forced or attempted repair may result in a fire of explosion D Do not use this water heater if any part has been under water Immediately call a qualified service technician to inspect the water heater and to replace any damaged parts OPERATING INSTRUCTIONS 1 STOP Read the safety information above or in the Owners Manual 2 Turn off all electric power to the water heater 3 Do not attempt to li...

Page 29: ...ARNING The outlet hot water temperature of the T K3 OS SP water heater is factory set at 122 ºF Use this heater at your own risk The set outlet water temperature can cause severe burns instantly or death from scalds Test the water before bathing or showering Do not leave children or an infirm person in the bath unsupervised DANGER Hot Water temperatures over 125 ºF can cause severe burns instantly...

Page 30: ...valve shall be installed to temper the water for those other uses in order to reduce scald hazard potential Water temperature over 125 F can cause severe burns instantly or death from scalds Chemicals such as diluted Glycol can be used for radiant floor Hydro fan coil air or Baseboard heating only The diluted solution of glycol must contain LESS than 30 of Glycol Heating application only Size the ...

Page 31: ... of Massachusetts There are a wide variety of variations to the application of controls and equipment presented Designers must add all necessary safety and auxiliary equipment to conform to code requirements and design practice For more details contact the Takagi Technical Department at 888 882 5244 Size the pump to provide at least 2 GPM through the system at 15 Ft of Head plus applications and p...

Page 32: ... plus piping head losses 2 GPM will allow the system to operate at its optimal performance If the application requires a higher re circulating flow rate make sure that the re circulating flow rate is no greater than 4 GPM If the flow rate is too high the system could be damaged by erosion This is a concept drawing only ...

Page 33: ...rminator to exhaust flue gases through the wall without a thimble Install this vent terminator in accordance with Takagi s installation instructions and any applicable codes 3 TK TV03 Vent Damper for T K3 SP The TK TV03 Vent Damper prevents the backflow of air through the exhaust vent This is a CSA tested Takagi component This helps prevent harmful exhaust gases from entering the home as well as h...

Page 34: ...PONENTS DIAGRAM Case assembly Computer board assembly 701 708 716 711 405 406 709 712 714 710 718 713 001 002 004 005 052 050 054 053 702 707 706 T K3 SP T K3 OS 001 002 004 005 050 052 052 053 054 707 706 702 ...

Page 35: ... gasket 105 Gas valve assembly 113 Gas inlet ring 121 Surge box plate 106 Flame rod 114 Burner window 122 Igniter plate 107 Igniter rod 115 Rod holder gasket 123 Wire clamp 60 108 Gas inlet 116 Rod holder 12 Burner assembly T K3 SP 101 102 103 104 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 716 704 708 159 703 715 704 717 705 156 153 151 153 151 152 154 158 150 ...

Page 36: ...heater 403 Water inlet 410 Heater 417 Outlet drain plug 404 Water outlet 411 Pipe heater fixing plate 418 Exhaust 405 Oｕｔｌｅｔ thermistor 412 Fuse fixing plate 18 419 Silicon ring OS 406 Inlet thermistor 413 Fuse fixing plate 14 Water way assembly T K3 SP T K3 OS 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 401 418 419 450 456 052 452 457 458 454 454 458 455 456 450 451 453 ...

Page 37: ...er M3 10 Water way assembly 450 Screw M4 6 454 O ring P14 EPDM 458 Fastener 14 22 451 Screw M3 6 455 O ring P6 EPDM 452 O ring P16 EPDM 456 O ring P4 EPDM 453 O ring P15 EPDM 457 Fastener 16A Computer board assembly 701 Computer board 709 Flow sensor wire 702 Transformer TD 227 715 AC120V power ON OFF switch 703 Surge box 710 Flame rod wire 716 Igniter and Freeze protection wire 704 Igniter 711 Ga...

Page 38: ...Hot Water GPM 40 F 50 F 60 F 70 F 40 F 6 2 5 7 5 2 4 8 4 4 4 1 3 9 3 7 3 5 3 3 3 1 2 8 2 6 2 5 2 4 2 3 2 2 50 F 7 0 6 9 6 2 5 7 5 2 4 8 4 4 4 1 3 9 3 7 3 5 3 1 2 8 2 7 2 6 2 5 2 4 60 F 7 0 6 9 6 2 5 7 5 2 4 8 4 4 4 1 3 9 3 5 3 1 3 0 2 8 2 7 2 6 70 F 7 0 6 9 6 2 5 9 5 4 5 0 4 7 4 1 3 6 3 4 3 3 3 1 3 0 90 95 100 105 110 115 120 125 130 135 140 150 160 165 170 175 180 Output Hot Water GPM ...

Page 39: ...Heat Exchanger Warranty If the heat exchanger fails within ten 10 years in normal residential operation with proper installation see instruction from installation manual from the installation date Takagi Industrial Co USA Inc will furnish a brand new heat exchanger or a refurbished or conditioned tank less water heater with same model For commercial industrial or and recirculation applications or ...

Page 40: ... 40 19H046 ...

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