T-K2 Instantaneous Water Heater Installation Manual and Owner’s Guide FOR YOUR SAFETY - This product must be installed and serviced by a professional service technician or licensed person, qualified in water heater installation. Operation creates carbon monoxide gas and flue gases, which can cause serious injury or death. Improper installation and/or operation, or installation by an unqualified person, will void warranty.
Table of Contents Specifications…………………………….. 2 For Your Safety…………………………... 3 Operation…………………………………. 4 General…………………………… 4 Turning It On……………………… 4 Turning It Off……………………… 4 Temperature……………………… 4 Flow……………………………….. 4 Freeze Protection………………... 5 Installation………………………………… 6 General…………………………… 6 Accessories………………………. 6 Electrical Connections…………... 6 Wiring Diagrams…………………..7,8 Gas Supply Piping………………. 9 Water Plumbing………………….. 10 Pressure Relief Valve……………. 10 Wall Hanging Installation………...
For Your Safety PLEASE READ THIS MANUAL CAREFULLY AND FOLLOW IT EXACTLY FOR YOUR SAFETY. 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 USA or the CGA standard, CAN/CGA B149.1 or .2 Installation Codes for Gas Burning Appliances in Canada. 2.
Operation General The Flash Water Heater is an instantaneous, tankless water heater designed to efficiently supply domestic or commercial hot water. The principle behind the Flash water heater is simple: Once a hot water tap is opened, the Flash’s flow sensor detects that hot water is needed, and automatically commands the computer to electronically ignite the burners, and heat water.
The flow rate through the T-K2 is limited to a maximum of 6.9 GPM. The temperature setting, along with the supply temperature of the water will determine the flow rate the unit puts out. Consult the flow charts on the last page of this manual to determine the possible outlet temperature and flow rate combinations. Based on the United States Department of Energy method of testing water heater output, the T-K2 is rated for 240 gallons per hour, or 4.0 GPM, at a 77° F rise above the inlet temperature.
Installation This section is for the installer. The installer is responsible for the correct installation of your Flash Water Heater. For Your Safety: Only a certified and trained service technician or qualified plumber may service or install your product. Please keep this owner’s manual in a safe place for future reference. Copies of this manual are available from TAKAGI-USA General All gas water heaters require careful and correct installation to ensure safe and efficient operation.
Refer to the following wiring diagrams. Wiring diagrams are also printed on the inside panel of the appliance. Wiring Diagrams Electrical Rating 120 VAC, 60 Hz, 0.8 A. 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. Wires are available through the manufacturer.
Gas Supply Piping Check the rating plate to make sure that the unit was built for the type of gas available in the area. The gas supply piping should be sized according to the Applicable Plumbing Code for a maximum draw of 185,000 BTUH. First determine the effective length of the gas supply line by measuring the actual length of piping, and then adding 5 ft. for every elbow or “T” to the actual length. Use the charts below to determine the pipe diameter necessary to accommodate the BTU demand of the unit.
Water Plumbing Follow local guidelines for the length of the plumbing line in order to ensure that there is enough water pressure for all the fixtures on the line. First, calculate the effective length of the plumbing line by measuring the total length of pipe, and then adding to this 5’ for each elbow or tee in the line.
Wall Hanging Installation For a wall mount installation, use TK-BK01 brackets to securely attach the T-K2 to the wall. Locate the heater as desired, but follow all applicable local codes, as well as the indoor or outdoor clearances that apply to the installation. Standing Installation If the unit is to be installed standing on a surface, adjust the legs so that the unit stands securely and is level (legs can be adjusted up to 1”). Do not install the unit standing directly on a combustible surface.
WARNING: Do not install the heater where water, debris, or flammable vapors may get into the flue terminal. This may cause damage to the heater. Combustible Air Supply The T-K2 must be installed in a location where the proper amount of combustible air will be available to it at all times. If the unit is installed in a confined space, there must be permanent openings supplying air to the unit.
Exhaust Venting This water heater must be vented in accordance with the section on venting of equipment in the latest edition of the National Fuel Gas Code. This is a Category III appliance, and must be vented accordingly. The following are UL listed manufacturers: ProTech Systems FasNSeal, Z-Flex Inc. Z-Vent II and Heat-Fab Inc. Saf-T Vent. This unit requires 4” vent pipe. Connect the vent pipe to the unit so that it is sealed airtight.
Initiating the Appliance Initial Operation For your safety, read before operating. 1. STOP! Do not operate without reading the safety information first! 2. Switch off the electrical power supply to the heater. 3. Do not attempt to light the burner manually. 4. Turn the manual gas control valve located on the outside of the unit counterclockwise to the OFF position. 5. Wait five (5) minutes to clear out any gas. If you then smell gas, STOP! Follow “b” in the “Initiating the Appliance” section above.
Space Heating Application The FLASH T-K2 can be used for space heating as well as potable heating of hot water applications. WARNING • • • • • Toxic chemicals such as used for boiler treatments chemical, alcohol, glycerol and glycol group will not be introduced into the system when used for potable water and space heating.
Dual-purpose hot water heating (Domestic and Heating): Pressure Relief Valve Air Vent Pump Expansion Tank Domestic potable water Radiant, Hydro or Baseboard Heating Equipment. Check Valve Priority Control Devices Cold water supply Priority Control Devices: It has a capability to make priority system that can be used as a controller flow sensor, Aquastat, or electronic controller to controlling radiant, Hydro or baseboard heating equipments.
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.
DAN GER 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. Can be carried from other rooms to the main burner by air currents.
Applications The T-K2 can be installed in a variety of plumbing applications, which will provide more comfortable domestic hot water. Contact Takagi for information on using this unit as a heat source. T-K2 with Storage Tank Hot Out Cold In Relief Valve Check Valve Hot Water Recirculation Recirc. Pump Pump The maximum flow rate through the T-K2 is 6.9 GPM. If it is necessary to achieve higher flow rates for longer periods of time, then it can be installed in conjunction with a storage tank.
Maintenance WARNING: Turn off the electrical power supply, the manual gas control valve, and the manual water control valve before servicing. The unit should be checked once a year or as necessary by a certified and trained technician. If repairs are needed, the repairs should be done by a certified and trained technician. The following systems and parts should be checked at least once a year: 1. Venting systems 2. Burners 3. Manual operation of the pressure relief valve to ensure correct operation. 4.
The T-K2 Will Not Initiate First check the flow rate through the unit. If the flow is not .75 GPM or greater, the unit will not initiate. Check the filter and the flow sensor for any debris or damage. Press the lower green button on the GFCI inside the unit. If the red light above it does not come on, then there is a problem with the electrical supply to the unit.
Optional Items TK-RE01 Temperature Remote Controller The TK-RE01 Temperature Remote Controller has two functions, it allows the maximum output temperature from the T-K2 to be adjusted within the range of 95° F to 180° F, and it also works as a diagnostic toll that will give a concise error code whenever there is a problem with the unit. The temperature options are 95° , 100° , 102° , 104° , 106° , 108° , 109° , 111° , 113° , 115° , 117° , 122° , 131° , 140° , 158° , 167° and 180° F.
T-K2 Dipswitch Temperature Settings In the following dipswitch diagrams, the direction in which the head of the dipswitch should be pointing is represented with black.
Indoor LP Dipswitch Settings ON 4 3 LP IN 180 4 2 3 OUT IN 1 4 3 OUT ON 120° F NG ON 2 180 105 2 LP 112 1 4 3 2 NG 1 4 4 IN ON 112° F 105 1 180 ON 105° F OUT 3 IN 112 ON 2 2 1 180 LP 1 4 OUT 1 2 IN NG ON 3 OUT 3 LP 105 2 NG 112 1 105 ON 3 4 ON 4 LP 3 2 NG 2 3 105 112 1 4 112 1 LP Indoor Temperature Settings 180 ON 180° F ERROR Outdoor LP Dipswitch Settings ON 105° F ON 112° F ON 120° F 4 3 LP IN 180 ON 180° F 4 2
Computer board assembly
Case assembly
Burner assembly
Water way assembly
T - K2 PARTS LIST 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 CASE ASSEMBLY BACK GUARD PANEL ASSEMBLY FRONT COVER FIXING PLATE TRANSFORMER JUNCTION BOX JUNCTION BOX COVER SCREW SCREW (COATED) SCREW SCREW SILICON RING HEAT EXCHANGER ASSEMBLY HEAT EXCHNAGER FIXING PLATE (BACK) HEAT EXCHANGER FIXING PLATE (FRONT) SCREW HI-LIMIT SWITCH SCREW QUICK RELEASE PLATE O-RING WATER CONTROL VALVE O-RING GASKET QUICK RELEASE PLATE QUICK RE
Flow Rate vs. Temperature Hot Water Out GPM vs. Output Temperature for Various Input Temperature 8.0 7.0 Gallon per Minuite 6.0 5.0 4.0 3.0 2.0 1.0 0.0 110 115 120 125 130 135 140 155 165 180 40 F 4.4 4.1 3.9 3.6 3.4 3.3 3.1 2.7 2.5 2.2 50 F 5.2 4.8 4.4 4.1 3.9 3.6 3.4 3.0 2.7 2.4 60 F 6.2 5.6 5.2 4.8 4.4 4.1 3.9 3.3 3.0 2.6 70 F 6.7 6.7 6.2 5.6 5.2 4.8 4.4 3.6 3.3 2.