T-K3 / T-K3-Pro On-Demand Water Heater Installation Manual and Owner’s Guide T-K3-Pro model ONLY WARNING This product must be installed and serviced by a licensed plumber, a licensed gas fitter, or a 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.
CONTENTS SPECIFICATIONS……………………...2 INTRODUCTION…………………….… 3 SAFETY GUIDELINES…………….….. 4 INSTALLATION……………………..…. 5 General…………………………….… 6 Included Accessories………………. 6 Outdoor Installation…………………. 8 Indoor Installation………………….... 9 Direct Intake Vent System…………. 10 Venting Instructions……………….... 11 Gas Supply / Gas Pipe Sizing…...… 17 Water Connections……………..……19 Pressure Relief Valve…………….… 20 Electrical Connections…………….... 21 Remote Controller Connection…..… 22 Easy Link System………..………..
INTRODUCTION • This manual provides information necessary for the installation, operation, and maintenance of the Flash T-K3/T-K3-Pro water heater. • The model description is listed on the rating plate which is attached to the front cover of the water heater. • Please read all installation instructions completely before installing this product. • If you have any problems or questions regarding this equipment, consult with Takagi or its local representative.
SAFETY GUIDELINES • Installation and service must be performed by a qualified installer (for example, a licensed plumber or gas fitter), otherwise the warranty by Takagi will be void. • The installer (licensed professional) is responsible for the correct installation of your Flash T-K3/T-K3-Pro Water Heater and for compliance WARNING with all national, state/provincial, and local codes. PLEASE READ THIS MANUAL CAREFULLY AND FOLLOW ALL DIRECTIONS. GENERAL 1.
INSTALLATION 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 at the beginning of this manual. • The warranty will not cover damage caused by water quality. Water hardness that leads to scale formation and/or corrosion may affect/damage the water heater. Hard water scaling and/or corrosion must be avoided or controlled by proper water treatment.
GENERAL 1. The manifold gas pressure is preset at the factory. It is computer controlled and should not need adjustment. 2. Maintain proper space for servicing. Install the unit so that it can be connected or removed easily. Refer to p. 7, p.8 and p. 9 for proper clearances. 3. The electrical connection requires a means of disconnection, to terminate power to the water heater for servicing and safety purposes. 4.
WARNING FOR INSTALLATION LOCATIONS Do not install the heater where water, debris or flammable vapors may get into the flue terminal. This may cause damage to the heater and void the warranty. Do not have the vent terminal pointing toward any opening into a building. Do not locate your heater in a pit or location where gas and water can accumulate. Prohibited Prohibited Do not install this water heater under an overhang less than 3 feet from its top or eaves.
OUTDOOR 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. Install outdoors only in areas with mild, temperate climates. 3. Ensure that the unit is set for outdoor installation. Locate the bank of dipswitches to the right of the 7-Seg. LED on the computer board.
INDOOR 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. Top 12” 2. When installed indoors, the T-K3/T-K3-Pro water heater shall be located in an area to maintain the following minimum clearances around the unit: Back 1” Side 2” Side 2” Keep the clearances.
DIRECT INTAKE VENT SYSTEM This T-K3/T-K3-Pro water heater may be converted to a direct vent (sealed combustion) appliance by installing an adapter (Part No. TK-TV10) which will bring all required combustible air from outside the building. When installing the TK-TV10 conversion kit, please follow all instructions included with the kit. • The T-K3/T-K3-Pro must be installed in a location where the proper amount of combustible air will be available to it at all times without obstructions.
VENTING INSTRUCTIONS WARNING: Improper venting of this appliance can result in excessive levels of carbon monoxide which can result in severe personal injury or death. This water heater must be vented in accordance with the section “Venting of Equipment" of the latest edition of the Natural Fuel Gas Code: The ANSI Z223.1, All applicable local building codes, Section 7 of the CAN/CSA B149.1 Natural Gas in Canada, Propane Installation Code in Canada.
VENT TERMINATION WARNING: Improper installation can cause nausea or asphyxiation, severe injury or death from carbon monoxide and flue gases poisoning. Improper installation will void product warranty. • The vent terminator provides a means of installing vent pipe through the building wall and must be located in accordance with ANSI Z223.1/NFPA 54, or in Canada with CAN/CSAB149.1 and local applicable codes.
Horizontal Installation Diagram Wall Vertical Condensation Drain (Install according to local codes) Sidewall Vent Terminator TK-BF01 Backflow Preventor (Recommended for freezing weather conditions: 36°F and below) Rain Cap Vertical Installation Diagram Roof Roof Flashing TK-BF01 Backflow preventor (Recommended for freezing weather conditions: 36°F and below) Vertical Condensation Drain (Install according to local codes) • Regarding the clearance from the terminator to the air inlet or opening, ref
VENT CLEARANCES Canada Direct vent and other than Direct Vent U.S.A Direct vent Other than Direct Vent 1 foot A Clearance above grade, veranda, porch, deck, or balcony. 1 foot 1 foot B Clearance to window or door that may be opened. 3 feet 1 foot 4 feet from below or side opening. 1 foot from above opening.
ADDITIONAL CLEARANCES Please follow all local and national codes in regards to proper termination clearances. In the absence of such codes, the following clearances can be used as guidelines. Local codes supersede these guidelines. For sidewall terminations 2ft. 1ft. 1ft. For multiple sidewall exhaust terminations (e.g. multi-unit systems), an exhaust termination must be at least 1 ft. away from another exhaust termination. An exhaust termination must also be at least 2 ft.
2ft. Exhaust termination Exhaust and/or direct-vent sidewall terminations should be at least 2 ft. away from an opposite surface/wall. Do not place the termination directly in front of an opening into a building. For rooftop terminations A A 2ft.
GAS SUPPLY AND GAS PIPE SIZING TO TURN OFF GAS TO APPLIANCE 1. Turn off all electric power to the water heater if service is to be performed. 2. Turn the manual gas valve located on the outside of the unit clockwise 3 to the off position. WARNING: Conversion of this unit from natural gas to propane or vise versa cannot be done in the field. Contact your local distributor to get the correct unit for your gas type. Conversion done by anyone other than the manufacturer will void all warranty.
Size the gas pipe appropriately to supply the necessary volume of gas required for the T-K3/T-K3-Pro (199,000 BTUH for both Natural Gas and Liquid Propane) using ANSI233.1/NAPA 54 in the USA or CAN/CSA B149.1 in Canada or local codes. Otherwise, flow capabilities and output temperatures will be limited. 1. Install a manual gas shut-off valve between the T-K3/T-K3-Pro and the gas supply line. 2.
WATER CONNECTIONS FOR YOUR SAFETY, READ BEFORE OPERATING: Do not use this water heater if any part has been submersed under water. Immediately call a licensed professional to inspect the water heater and to replace any damaged parts. 1. All pipes, pipe fittings, valves and other components, including soldering materials, must be suitable for potable water systems. 2.
PRESSURE RELIEF VALVE The Flash T-K3/T-K3-Pro has a high-temperature shut off switch built in as a standard safety feature (called a Hi-Limit switch) therefore a “pressure only” relief valve is required. 1. This unit does not come with an approved pressure relief valve. 2. An approved pressure relief valve must be installed on the hot water outlet. 3. The pressure relief valve must conform to ANSI Z21.22 or CAN 1-4.4 and installation must follow local code. 4.
ELECTRICAL CONNECTIONS WARNING: Follow the electrical code requirements of the local authority having jurisdiction. In the absence of such requirements, follow the latest edition of the National Electrical Code ANSI/NFPA 70 in the U.S. or the latest edition of CSA C22.1 Canadian Electrical Code, Part 1, in Canada. CAUTION: When servicing or replacing parts within the T-K3/T-K3-Pro, label all wires prior to disconnection to facilitate an easy and error-free reconnection.
REMOTE CONTROLLER CONNECTION 1) Disconnect power supply from the T-K3/T-K3-Pro. 2) Take off the T-K3/T-K3-Pro’s front cover. 3) Please find the remote control terminal using the picture below (located around the lower right-hand side of the computer board). 4) Open the plastic cover of the TM-RE30, and then attach the fork terminal to the connector base of the backside the TM-RE30 with two screws. Make sure the terminals are firmly fixed.
EASY LINK SYSTEM The T-K3/T-K3-Pro can be connected with other T-K3/T-K3-Pro’s with communication cables to work as a multiple manifold system. • The Easy Link system can connect up to 4 units. • A communication cable (gray color) comes with each unit. You can manifold from 2 units to 4 units without a multi-system controller. A 4-unit system has full automatic modulation between 11,000 BTU and 796,000 BTU. Gas Hot Cold • The T-K3/T-K3-Pro Easy Link system is limited to 4 units.
Easy Link Connection Procedures 1. Choose one of your units as the “MASTER” unit. 2. “The MASTER” Locate the bank of dipswitches to the right of the 7-seg. LED on the computer board of the TK3/T-K3-Pro that you select to be the “MASTER” unit. Change dipswitch No. 1 to “ON”. Do not change any dipswitch settings on the “SLAVE” units. 3. Between the “MASTER” and the “SLAVE-1” Connect the “MASTER connector” of the “MASTER unit” to the “SLAVE IN connector” of the “SLAVE-1” unit. 4.
CAUTION • If you connect the “SLAVE IN (or SLAVE OUT) connector” of the “MASTER” unit to the “MASTER (or SLAVE IN) connector” of the “SLAVE-1” unit, the system will not work as a easy link system. The “ON LINE” lamps will stay unlit and the units will work as individual units.
• If the TM-RE30 or the TM-RE10 remote controller (optional) has to be connected to the “MASTER” unit. If the TM-RE30 or the TM-RE10 is connected to a “SLAVE” unit, it will only control that particular individual “SLAVE” unit and will not control the Easy Link system as a whole.
INITIAL OPERATION FOR YOUR SAFETY, READ BEFORE OPERATING: • Check the GAS and WATER CONNECTIONS for leaks before firing it for the first time. • Open the main gas supply valve to the unit using only your hand to avoid any spark. Never use tools. If the knob will not turn by hand, do not try to force it; call a qualified service technician. Forced repair may result in a fire or explosion due to gas leaks.
NORMAL OPERATION • Flow rate to activate the T-K3/T-K3-Pro : 0.5 gallon per minute • Flow rate to keep the T-K3/T-K3-Pro running : 0.4 gallon per minute 1. NORMAL OPERATION WITHOUT REMOTE CONTROLLER 1. Open a hot water tap. 3. Close the hot water tap. 2. Mix cold water with the hot to get the correct temperature water. 2. NORMAL OPERATION WITH REMOTE CONTROLLER INSTALLED: TM-RE30 (Optional) *If the TM-RE10 is used, refer to the TM-RE10 Installation Manual included with the remote. 1.
FLOW • The flow rate through the FLASH T-K3/T-K3-Pro is limited to a maximum of 7.0 GPM. • The temperature setting, along with the supply temperature of the water will determine the flow rate output of the unit. • Please refer to the temperature vs. gallons per minute chart on p. 46 to determine the likely flow rates based on your local ground water temperature and your desired outlet water temperature combination.
TEMPERATURE SETTINGS • There are 8 preset temperatures that you can select from by changing the dipswitch settings on the computer board. • The temperature has been preset at the factory to 122ºF (50ºC). • If you desire to change the set temperature with dipswitches, please refer to the diagram on below. These temperatures are available: 104ºF, 113ºF, 122ºF, 131ºF, 140ºF, 158ºF, 176ºF, and 185ºF. • 140ºF, 158ºF, 176ºF and 185ºF are for heating applications only.
MAINTENANCE AND SERVICE WARNING: Turn off the electrical power supply and close the manual gas control valve and the manual water control valve before servicing. • Clean the cold-water inlet filter. (Refer to diagram below) • Be sure that all openings for combustion and ventilation air are not blocked. • Check that the exhaust vent pipe is not blocked. • Check the gas pressure. • Keep the area around the water heater clear. Remove any combustible materials, gasoline or any flammable vapors and liquids.
GENERAL TROUBLESHOOTING ~ TEMPERATURE and AMOUNT OF HOT WATER ~ PROBLEM POSSIBLE SOLUTIONS It takes long time to get hot water at the fixtures. • The time it takes to deliver hot water from the TK3/T-K3-Pro to your fixtures depends on the length of piping between the two. The longer the distance or the bigger the pipes, the longer it will take to get hot water. • If you would like to receive hot water to your fixtures quicker, you may want to consider a hot water recirculation system. (p.
~ WATER HEATER ~ PROBLEM POSSIBLE SOLUTIONS Unit does not ignite when water goes through the unit. • • • • 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. Is the flow rate over 0.5 GPM? (p. 28) Check for the filter on cold water inlet. (p. 31) Check for reverse connection and cross connection.
TROUBLESHOOTING – ERROR CODES • • All Takagi units are self diagnostic for safety and convenience when trouble shooting. If there is a problem with the installation or the unit, it will display a numerical error code on the TM-RE30 (if installed) or on the 7-Seg LED at the bottom left corner of the computer board to communicate the source of the problem. • Consult the following chart for the cause of each error code.
WIRING DIAGRAM A wiring diagram is located on the inside 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.
OPERATING SAFETY FOR YOUR SAFETY READ BEFORE OPERATING WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. A. This water heater does not have a pilot. It is equipped with an ignition device that automatically lights the burner. Do not try to light the burner by hand. B. BEFORE OPERATING smell all around the water heater area for evidence of leaking gas.
DANGER Vapors from flammable liquids will explode and catch fire causing death or severe burns. Do not use or store flammable products such as gasoline, solvents or adhesives in the same room or area near the water heater. Keep flammable products: 1. Far away from heater. 2. In approved containers. 3. Tightly closed 4. Out of children's reach Vapors: 1. Cannot be seen 2. Vapors are heavier than air 3. Go a long way on the floor 4.
APPLICATIONS Space Heating Applications WARNING • Toxic chemicals used in boiler treatments such as alcohol, glycerol and glycol group must not be introduced into the system when used for open loop potable water and space heating. • The T-K3/T-K3-Pro can be used to supply potable water and space heating and shall not be connected to any heating system or component(s) previously used with nonpotable water where any chemicals were added to the water heating appliances.
Dual-purpose hot water heating (Domestic and Space Heating): Diagramatic Layout of Radiant Heating and Domestic Water Heater Per Mass. Code An approved Pressure Only Relief Valve, Tie to Location approved by Local Codes and Must Meet BTU Rating of Takagi Model Used Cold Inlet Apply Correct Thermal Expansion Tank-Size Per Application Shut-Off Valve Thermostatic Mixing Valve 4" Gas Exhaust Vent (Discharge Must Comply with Local and State Codes).
OPTIONAL ITEMS 1. TM-RE30 Temperature Remote Controller 2. TK-BF01 Backflow preventer The TM-RE30 Temperature The TK-BF01 Backflow Remote Controller has two preventer prevents the backflow functions. It allows the output of air through the exhaust vent.
COMPONENTS DIAGRAM Case assembly Other than the front cover (No.7), all of the T-K3-Pro’s parts are the same as the T-K3. 052 050 002 006 052 051 051 004 052 003 001 051 706 707 053 050 007 702 054 052 053 005 052 Computer board assembly The T-K3 and the T-K3-Pro share the same components.
Burner assembly The T-K3 and the T-K3-Pro share the same components.
Water way assembly Other than the heat exchanger assembly (No.420), all of the T-K3-Pro’s parts are the same as the T-K3.
PARTS LIST Other than the front cover (No.7) and heat exchanger assembly (No.420), all of the T-K3-Pro’s components are the same as the T-K3.
Item# Part# Description Item# Part# Description 418 EKK2P Inlet heater 705 EKJ59 Freeze protection thermostat 419 EKK2E Outlet drain plug 706 EKN37 Fuse assembly 420 EK322 Heat exchanger assembly for T-K3-Pro 707 EKJ66 Junction box inner plate 450 EW009 Screw M4×6 708 EKK1M Computer board cover 451 EW00A Screw M4×3 709 EKK0D AC100V wire 452 EZM16 O-ring P16 FKM 710 EKK0Z EH-IG Wire 453 EZM15 O-ring P15 FKM 711 EKK10 Gas valve wire 454 EZM14 O-ring P14 FKM 7
OUTPUT TEMPERATURE CHART Out Put Temperature vs. GPM (Max.7.0 GPM) with Various Ground Water Temperature Correct Gas pipe size can be expect this chart 7.0 6.0 Out Put Hot Water GPM Output Hot Water GPM 5.0 4.0 3.0 2.0 1.0 0.0 90 95 100 105 110 115 120 125 130 135 140 150 160 165 170 175 180 40 F 6.5 5.9 5.4 5.0 4.7 4.3 4.1 3.8 3.6 3.4 3.3 3.0 2.7 2.6 2.5 2.4 2.3 50 F 7.0 7.0 6.5 5.9 5.4 5.0 4.7 4.3 4.1 3.8 3.6 3.3 3.0 2.8 2.7 2.6 2.5 7.0 7.
PRODUCT REGISTRATION AND LIMITED WARRANTY 1. Product registration card or form: The enclosed product registration card must be completed and returned within 45 days of original purchasing date by retail buyer. Copy of proof of original purchasing date must be sent in with the warranty card. The customer may register online with attached proof of original purchasing date via the Internet (www.takagi.com/warranty). THE CARD OR FORM IS FOR PRODUCT REGISTRATION.
(1) Heat exchanger (2) An on-demand recirculation system is a system that utilizes either a push-button or other type of manual activation (as opposed to automatic activation with a temperature sensor or timer) to activate the circulation pump. An on-demand recirculation system can use either the existing cold water line as the return line or have its own dedicated return line.
