Takagi T-H2-DV Installation Manual And Owner's Manual
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Takagi T-H2-DV Installation Manual And Owner's Manual

On-demand condensing water heater
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T H2 DV / T H2 OS
On Demand Condensing Water Heater
Installation Manual and Owner's Guide
Gas Tankless Water Heater
Model T H2 DV and T H2 OS
Suitable for potable water heating and space heating
FEATURING
x ENDLESS HOT WATER
x ON DEMAND USAGE
x COMPACT, SPACE SAVING
x ENERGY CONSERVATION
x COMPUTERIZED SAFETY
x NO PILOT LIGHT
x EASY LINK SYSTEM
WARNING
This product must be installed and
serviced by a licensed plumber, a
licensed gas fitter, or a professional
service
technician.
installation and/or operation, or
installation
by
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
Improper
an
unqualified

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Summary of Contents for Takagi T-H2-DV

  • Page 1 Suitable for potable water heating and space heating death. FEATURING x ENDLESS HOT WATER x ON DEMAND USAGE TAKAGI Industrial Co. USA, Inc. x COMPACT, SPACE SAVING 5 Whatney x ENERGY CONSERVATION Irvine, CA 92618 x COMPUTERIZED SAFETY...

  • Page 2: Table Of Contents

    Rule 1146.2, CO emission does not exceed 400 PARTS LIST………………….……………………… PPM for normal input OUTPUT TEMPERATURE CHART……...… Takagi reserves the right to discontinue, or change PRODUCT REGISTORATION AND at any time, specifications or designs without LIMITED WARRANTY…………………….…… notice and without incurring obligations...

  • Page 3: Introduction

    Please read all installation instructions completely before installing this product. x If you have any problems or questions regarding this equipment, consult with Takagi or its local representative. x The T H2 DV/T H2 OS Water Heater is an on demand, tankless water heater designed to efficiently supply endless hot water for your needs.

  • Page 4: Safety Guidelines

    PRESSURE and ELECTRIC RATING. *If this unit does not match your requirements, do not install and consult with TAKAGI. 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.

  • Page 5: Installation

    As with any water heating appliance, the potential for leakage at some time in the life of the product does exist. Takagi will not be responsible for any water damage that may occur. If you install a drain pan under the unit, ensure that it will not restrict the combustion air flow.

  • Page 6: General

    Installation GENERAL 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.

  • Page 7: Optional Items

    Installation OPTIONAL ITEMS 1. TM RE30 Temperature Remote Controller The TM RE30 Temperature Remote Controller has two functions. It allows the output temperature from the T H2 DV/T H2 OS to be adjusted within the range of 100 °F to 185 °F, and it also works as a diagnostic tool that will give a concise error code whenever there is a problem with the unit.

  • Page 8: Warning For Installations

    Installation WARNING FOR INSTALLATIONS FOR YOUR SAFETY, READ BEFORE INSTALLATION: FOR YOUR SAFETY, READ BEFORE INSTALLATION: Do not install the heater where water, debris or Do not have the vent terminal pointing toward flammable vapors may get into the flue terminal. any opening into a building.

  • Page 9: T H2 Os Installation

    2,500 to 4,000 ft 4,000 to 5,000 ft Altitude Over 5,000 ft (DEFAULT) Switch No.5 Switch No.6 Consult TAKAGI Technical Dept. at 1 888 882 5244 The dark squares indicate the direction the dipswitches should be set to. DO NOT adjust any dipswitches on the right bank.

  • Page 10: T H2 Dv Installation

    Sidewall venting is recommended for the T H2 DV. Vertical venting (roof termination) is acceptable. Side 3” Front 4” TAKAGI recommends running the (24” Recommended exhaust vent and the intake pipe as for Maintenance) parallel as possible. The TH PA01 adaptor is used to make Bottom 12”...
  • Page 11 The T H2 DV is a Category IV appliance and must be vented accordingly with any 4” vent approved for use with Category III/IV or Special BH type gas vent. TAKAGI recommends the “T Vent” line manufactured by TAKAGI (Refer to Takagi’s “T Vent” brochure for details). However, the following are also UL listed manufacturers: ProTech Systems Inc.

  • Page 12: Vent Termination

    Installation 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 / IV approved or Special BH vent pipe). The maximum length of exhaust vent piping must not exceed 50 ft.
  • Page 13 Installation PVC Venting Illustrations Horizontal Installation Diagram Vertical Installation Diagram (With elbow terminations) Wall Roof Roof Flashing Fire stop Connection between exhaust vent collar and PVC piping See the next page for instructions. Horizontal Installation Diagram (With 3” PVC Concentric Termination) Concentric Termination Wall Keep a 1”...
  • Page 14 Installation (For Intake: 4” only) 1. Connect a 4” PVC Straight pipe directly on the intake vent collar of the T H2 DV. (For Intake: 3” only) 1. Connect a 4” PVC Straight pipe directly on the intake vent collar of the T H2 DV. 2.

  • Page 15: Vent Clearances

    Installation Vent clearances Canada U.S.A Direct vent and other than Direct Direct vent Other than Direct Vent Vent Clearance above grade, veranda, porch, deck, 1 foot 1 foot 1 foot or balcony. 4 feet from below or side Clearance to window or door that may be 3 feet 1 foot opening.

  • Page 16: Additional Clearances

    Installation 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. 3ft. 1ft.

  • Page 17: Gas Supply And Gas Pipe Sizing

    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 or Takagi Service Representative will void all warranty. Takagi is not liable for any property and/or personal damage resulting from unauthorized conversions.
  • Page 18 Installation Re open the manual gas valve. Check to see that there are no gas leaks. Open some of the fixtures that use the highest flow rate to turn on the T H2 DV/T H2 OS. Check the inlet gas pressure. When T H2 DV/T H2 OS is on maximum burn, the manometer should read from 5.0”...

  • Page 19: Water Connections

    Divide each appliance’s BTU requirement by 1000BTU to get the appliances Cubic Ft. requirement. T H2 DV/ Takagi into account the distance the appliance is from the gas T H2 OS meter, look in the above gas chart to properly size the line.

  • Page 20: Pressure Relief Valve

    The T H2 DV/T H2 OS does not include a built in condensate neutralizer cartridge for reducing the pH level of condensate water. If local codes dictate that condensate must be neutralized prior to drainage, a condensate neutralizer must be installed. As an option, Takagi offers the TH NT01 Neutralizer assembly (sold separately).
  • Page 21 1. Connect a 1/2” FPT X 3/8” (or 1/2”) HB Adaptor to the condensate drain port at the bottom of the T H2 DV/T H2 OS. 2. Connect a condensate drain tube to the 1/2” FPT X 3/8” (or 1/2”) HB Adaptor. TAKAGI recommends the material of the condensate tube be either EPDM or PVC.
  • Page 22 All preventative measures and safety practices must be adhered to when draining condensate. TAKAGI will not be responsible for any damage caused by condensate. A drain pan, or other means of protection against water damage, is required to be installed under the water heater in case of leaks.

  • Page 23: Electrical Connections

    Installation ELECTRICAL CONNECTIONS 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 WARNING CSA C22.1 Canadian Electrical Code, Part 1, in Canada.

  • Page 24: Remote Controller Connection

    Installation TM RE30 REMOTE CONTROLLER CONNECTION Disconnect power supply from the T H2 DV/T H2 OS. Take off the T H2 DV/T H2 OS’s front cover. Locate the remote controller terminal, pictured below (located around the upper right hand side of the computer board).

  • Page 25: Pump Control Connection

    Installation PUMP CONTROL CONNECTION The T H2 DV/T H2 OS can be used to control a recirculation pump. Proper pump control helps to preserve the life of the system and saves energy as well: The T H2 DV/T H2 OS pump control port is a “normally open dry contact”, and therefore needs additional components to properly control a recirculation pump.

  • Page 26: Pump Control Mode

    Installation PUMP CONTROL MODES The T H2 DV/T H2 OS provides the four types of the pump control modes. The pump control modes are selected by changing dipswitch settings. The dipswitches that change the pump control modes are located in the right bank of dipswitches in the upper left quadrant of the computer board in the T H2 DV/T H2 OS.
  • Page 27 Installation D) Normal Control (Default setting): No.5 and No.6 OFF Feature: This mode provides no special pump control. Pump activation can only be turned ON or OFF by the TM RE30 remote controller. Function: The pump will run continually all the time as long as there is a power supply to the T H2 DV/T H2 OS.

  • Page 28: Easy Link System

    4 units, only the first 4 units will work as a part of the Easy Link system. The other additional units will not work. x The T H2 DV/T H2 OS cannot be linked with other different Takagi models in an CAUTION Easy Link system.
  • Page 29 Installation 4. Between the “MASTER” and the “SLAVE 1” units Connect the “MASTER connector” of the “MASTER” unit to the “[1] connector” of the “SLAVE 1” unit. 5. Between the “SLAVE 1” and the “SLAVE 2” units Connect the “[2] connector” of the “SLAVE 1” unit to the “[1] connector” of the “SLAVE 2” unit. 6.
  • Page 30 Installation (C) Examples of incorrect settings and/or connections CASE 1: x Unless you change dipswitch No.10 of the “MASTER” unit to the “ON” position, the system will not work as an Easy Link system. The units will operate as individual units. MASTER unit SLAVE 1 unit Wrong dipswitch setting...
  • Page 31 Installation CASE 3: If you connect the “MASTER connector” of the “SLAVE 1” unit to the “[1] connector” of the “SLAVE 2” unit, the “SLAVE 2” unit will operate as an individual unit, and will not be part of the Easy Link system. Wrong connection between the “SLAVE 1”...

  • Page 32: Applications

    Takagi Pump Control set to “Recirculation Mode” * The recirculation pump is to provide no less than 2 GPM and no more than 4 GPM through each activated Takagi unit in the system. This is a concept drawing only. Page...
  • Page 33 Shall Run 60 Seconds Every 6 Hours * The circulation pump is to provide no less than 2 GPM through each activated Takagi unit in the system. x Priority Control Devices such as a flow switch, an Aquastat or other electronic controller can be used to prioritize the domestic water system over the heating system.

  • Page 34: Initial Operation

    Initial Operation INITIAL OPERATION FOR YOUR SAFETY, READ BEFORE OPERATING x Check the GAS and WATER CONNECTIONS for leaks before firing unit for the first time. x Open the main gas supply valve to the unit using only your hand to avoid any spark. Never use tools.

  • Page 35: Operating Safety

    Operating Safety ’ ’ ’ 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.
  • Page 36 Operating Safety 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: Vapors: 1.

  • Page 37: Normal Operation

    Normal Operation NORMAL OPERATION GENERAL 1. Open a hot water tap. 2. Mix cold water with the hot to get 3. Close the hot water tap. the correct temperature water. x Flow rate to activate the T H2 DV/T H2 OS : 0.5 gallon per minute x Flow rate to keep the T H2 DV/T H2 OS running : 0.4 gallon per minute WARNING...
  • Page 38 Normal Operation Figure.1 Increase button Decrease button 3 digit 7 Seg LED T H2 DV/T H2 OS computer board Temperatures available (unit:°F) x The temperature has been preset at the factory to 120°F (49°C). x If temperatures other than the ones listed above are required, the TM RE30 can provide a couple more temperature options.

  • Page 39: Flow

    TAKAGI will not be responsible for any damage to the heat exchanger as a result of freezing. x TAKAGI also highly recommends the use of a back flow vent damper to minimize the amount of cold air entering through the exhaust venting when the water heater is off.

  • Page 40: Maintenance And Service

    Keep the area around the water heater clear. Remove any combustible materials, gasoline or any flammable vapors and liquids. TAKAGI recommends having the unit checked once a year or as necessary by a licensed technician. If repairs are needed, any repairs should be done by a licensed technician.

  • Page 41: Troubleshooting

    Troubleshooting TROUBLESHOOTING GENERAL PROBLEM SOLUTIONS x The time it takes to deliver hot water from the T H2 DV/T H2 OS It takes long time to get hot water at the to your fixtures depends on the length of piping between the two. fixtures.
  • Page 42 35 seconds in order to re ignite quickly, as well as purge all the exhaust gas out of the flue. x Contact TAKAGI. Abnormal sounds come from the unit. Remote controller does not Press the ON/OFF button.

  • Page 43: Error Codes

    Troubleshooting ERROR CODES T H2 DV/T H2 OS 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 3 digit 7 Seg.
  • Page 44 Error Malfunction description Diagnosis Code Check the dipswitch Incorrect dipswitch settings settings on PCB Call TAKAGI Warning for the “991” error code Technical Dept. at 1 888 882 5244 Ignition failure Check gas supply Loss of flame Output thermistor failure...

  • Page 45: Components Diagram

    Case assembly Other than the case assembly (No.15) and front cover (No.16), all of the T H2 OS’s parts are the same as the T H2 DV. The T H2 OS doesn’t have fan motor for exhaust (No.124). T-H2-DV T-H2-OS Page...

  • Page 46: Computer Board Assembly

    Components Diagram Computer board assembly Other than Part# 719, the T H2 DV and the T H2 OS share the same components. The T H2 OS doesn’t have exhaust thermistor assembly (No.706) and exhaust fan motor wire (No.720). Burner assembly The T H2 DV and the T H2 OS share the same components.

  • Page 47: Water Way Assembly

    Other than Part# 456, Part# 459, Part# 460 and Part# 461, the T H2 DV and the T H2 OS share the same components. The T H2 OS doesn’t have hi limit switch for exhaust (No.442) and exhaust thermistor assembly (No.706). T-H2-DV T-H2-OS Page...

  • Page 48: Parts List

    Parts List PARTS LIST Item# Part# Description Item# Part# Description EKH5B Case assembly for T H2 DV EKK2K Manifold gasket B EKH5M Front cover for T H2 DV Manifold assembly with EKH6T gas valve assembly LP EV00K Intake air port assembly EM335 Bracket Manifold assembly with...
  • Page 49 Parts List Item# Part# Description Item# Part# Description EX021 Heater plate EX12K Fastener “6 15” EX01H Fastener “16AG” EKH1Y Band B EKK2P Outlet heater EX13B Header EK239 Outlet drain plug EX13P Flat heater EZM06 O ring P6 FKM EX13R 3 array heater EX00H Mixing thermistor EZM12...
  • Page 50 Output Hot Water GPM...

  • Page 51: Limited Warranty

    This limited warranty gives you specific legal rights, and you may also have other rights which vary from State to State. The manufacturer, Takagi Industrial Co. USA, Inc., will honor the warranty to the original retail buyer at the original location only, and it is not transferable. THIS WARRANTY COVERS ONLY FAILED MECHANICAL AND ELECTRICAL PARTS DUE TO FACTORY DEFECTS UNDER NORMAL USAGE FOR THE PRODUCT’S INTENDED...
  • Page 52 Any Takagi product not installed in compliance with all applicable local & state codes, ordinances, and good trade practices. „ Any Takagi product sold to or installed in areas outside of the fifty states (and the District of Columbia) of the United States of America and Canada. „...

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