Takagi T-K4U-IN Installation Manual And Owner's Manual
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On-Demand Water Heater
Installation Manual and Owner's Guide
ANSI Z21.10.3 and CSA 4.3
Gas Tankless Water Heater
Suitable for potable water heating and space-heating*
* Please refer to local codes for space-heating compliance.
FEATURING
• ENDLESS HOT WATER
• ON-DEMAND USAGE
• COMPACT, SPACE SAVING
• ENERGY CONSERVATION
• COMPUTERIZED SAFETY
• NO PILOT LIGHT
• Satisfies the 2012 SCAQMD Rule
1146.2 for Ultra-Low NOx
Emissions
• EASY-LINK SYSTEM AND
MULTI-UNIT SYSTEM
(510U (T-D2U) model only)
510U (T-D2U)
model only
110U Indoor (T-KJr2U-IN)
•
310U Indoor (T-K4U-IN)
•
510U Indoor (T-D2U-IN)
•
- Do not store or use gasoline or other
- WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch, do not
TM
• Immediately call your gas supplier from
• If you cannot reach your gas supplier, call
- Installation and service must be performed
Models
110U Outdoor (T-KJr2U-OS)
•
310U Outdoor (T-K4U-OS)
•
510U Outdoor (T-D2U-OS)
•
If the information in these
instructions is not followed
exactly, a fire or explosion may
result causing property damage,
WARNING
personal injury or death.
flammable vapors and liquids in the vicinity
of this or any other appliance.
use any phone in your building.
a neighbor's phone. Follow the gas
supplier's instructions.
the fire department.
by a qualified installer, service agency or the
gas supplier.
If you have any questions, please
call or write to:
500 Tennessee Waltz Parkway
Ashland City, TN 37015
Toll Free: 1-877-737-2840
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Table of Contents
Related Manuals for Takagi T-K4U-IN
Summary of Contents for Takagi T-K4U-IN
- Page 1 Installation Manual and Owner’s Guide 510U (T-D2U) model only ANSI Z21.10.3 and CSA 4.3 Models 110U Indoor (T-KJr2U-IN) 110U Outdoor (T-KJr2U-OS) • • 310U Indoor (T-K4U-IN) 310U Outdoor (T-K4U-OS) • • 510U Indoor (T-D2U-IN) 510U Outdoor (T-D2U-OS) • • If the information in these instructions is not followed...
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Page 2: Table Of Contents
Contents CONTENTS Installation Manual SPECIFICATIONS .......................... 4 INTRODUCTION .......................... 5 SAFETY GUIDELINES ........................6 INSTALLATION ..........................7 General.............................7 Clearances..........................9 Included accessories........................9 Optional items..........................9 Warning for installations......................11 High-altitude installations......................12 Venting instructions.......................13 Gas supply and gas pipe sizing....................18 Water connections........................20 Electrical connections......................21 Temperature remote controller....................22 Easy-Link System........................25 Multi-Unit System........................29... -
Page 3: Installation Manual
Installation Manual Installation Manual CONGRATULATIONS Congratulations and thank you for choosing our tankless water heater. Before use, we recommend that you read through this safety manual carefully. Please refer to the back of the manual for details about the warranty. Keep this manual for future reference. If you lose the manual, contact the manufacturer or your local distributor. -
Page 4: Specifications
110U 310U 310U 510U 510U Model Indoor Outdoor Indoor Outdoor Indoor Outdoor (T-KJr2U-IN) (T-KJr2U-OS) (T-K4U-IN) (T-K4U-OS) (T-D2U-IN) (T-D2U-OS) Natural Gas Input Min.: 15,000 Min.: 15,000 Min.: 15,000 BTU/h (Operating Range) Max.: 140,000 Max.: 190,000 Max.: 199,000 Gas Connection 3/4" NPT Water Connections 3/4"... -
Page 5: Introduction
• This equipment is an on-demand, tankless water heater designed to efficiently supply endless hot water for your needs. • The 110U Indoor (T-KJr2U-IN), 310U Indoor (T-K4U-IN) and 510U Indoor (T-D2U-IN) models are only to be installed indoors (direct-vent (double vent) convertible). The 110U Outdoor (T-KJr2U-OS), 310U Outdoor (T-K4U-OS) and 510U Outdoor (T-D2U-OS) models are only to be installed outdoors. -
Page 6: Safety Guidelines
Installation Manual Safety Guidelines SAFETY GUIDELINES SAFETY DEFINITION Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. DANGER Indicates an imminently hazardous situation which, if not avoided, could result in death or serious injury. WARNING Indicates an imminently hazardous situation which, if not avoided, could result in minor or moderate injury. -
Page 7: Installation
Regularly ensure that the area around the unit is dust- or debris-free. Regular maintenance is recommended for these types of environment. 9. For the 110U Indoor (T-KJr2U-IN), 310U Indoor (T-K4U-IN) and 510U Indoor (T-D2U-IN) models: • These units may be converted to a direct-vent (sealed combustion) appliance by installing a direct-vent conversion kit Part No. - Page 8 Installation Manual Installation • Installation and service must be performed by a qualified installer (for example, a licensed plumber or gas fitter), otherwise the warranty will be void. WARNING • The installer (licensed professional) is responsible for the correct installation of the water heater and for compliance with all national, state / provincial, and local codes.
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Page 9: Clearances
Bottom Front Back Sides 110U Indoor (T-KJr2U-IN)* 12 in. 12 in. 4 in.** 0.5 in. 3 in. 310U Indoor (T-K4U-IN)* (305 mm) (305 mm) (102 mm) (13 mm) (76 mm) 510U Indoor (T-D2U-IN)* 110U Outdoor (T-KJr2U-OS) 36 in. 12 in. - Page 10 Installation Manual Installation 1. 4” Backflow preventer and F-F adaptor: 2. Direct-vent conversion kit: 9007667005 9007996005 (TK-TV10) There are two functions available for this This kit can be used adaptor, which can be connected with the to convert the water water heater and NovaVent venting line heater from a single and prevents the backflow of air through...
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Page 11: Warning For Installations
Installation Manual Installation WARNING FOR INSTALLATIONS 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. Do not locate your This may cause damage to the heater and void the heater in a pit or location where gas and water warranty. -
Page 12: High-Altitude Installations
Installation Manual Installation HIGH-ALTITUDE INSTALLATIONS Check the elevation where your water heater is installed. Set DIPswitches shown in the table below depending on the altitude. Indoor models Altitude 0 to 2,000 ft. 2,000 to 3,000 to 5,000 to 7,500 to DIPswitches (DEFAULT) 3,000 ft. -
Page 13: Venting Instructions
Installation Manual Installation VENTING INSTRUCTIONS For indoor models -General- • Improper venting of this appliance can result in excessive levels of carbon monoxide which can result in severe personal injury or death. • Improper installation can cause nausea or asphyxiation, severe injury or death DANGER from carbon monoxide and flue gases poisoning. - Page 14 Set DIPswitches shown in the table below depending on the vent length. 110U Indoor (T-KJr2U-IN) 510U Indoor (T-D2U-IN) Vent length 310U Indoor (T-K4U-IN) (Upper bank of DIPswitches) ON 1 2 3 4 5 6 7 8 9 10 ON 1 2 3 4 5 6 7 8 0 to 7 ft No.
- Page 15 Installation Manual Installation Venting Illustrations- For the 110U Indoor (T-KJr2U-IN), 310U Indoor (T-K4U-IN) and 510U Indoor (T-D2U-IN) models For details of the optional items, refer to the Installation manual for each Optional item. Vertical Installation Horizontal Installation Rain cap Wall...
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Page 16: Vent Termination Clearances
Installation Manual Installation -Vent termination clearances- INSIDE CORNER DETAIL Vent terminal Air supply inlet Area where is not permitted Gas meter / regulator Canada U.S.A Direct-vent and other Direct- Other than than Direct-vent vent Direct-vent Clearance above grade, veranda, porch, deck, or 1 foot 1 foot 1 foot... - Page 17 Installation Manual Installation -For sidewall terminations- For multiple sidewall exhaust terminations (e.g. multi- 2 ft. unit systems), an exhaust termination must be at least 1 (610 mm) min 1 ft. (305 mm) ft. (305mm) away from another exhaust termination. An exhaust termination must also be at least 2 ft.
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Page 18: Gas Supply And Gas Pipe Sizing
Installation Manual Installation GAS SUPPLY AND GAS PIPE SIZING -General- • Check that the type of gas matches the rating plate first. • Ensure that any and all gas regulators used are operating properly and providing gas pressures within the specified range shown below. Excess gas inlet pressure may cause serious accidents. - Page 19 Installation Manual Installation -Natural Gas Supply Piping- Maximum delivery capacity of cubic feet of gas per hour of IPS pipe carrying Natural Gas with 0.60 specific gravity based on pressure drop of 0.5" W.C. Based on energy content of 1,000 BTU/Cubic ft.: The water heater requires 140 Cubic ft./hr for the 110U (T-KJr2U) model, 190 Cubic ft./hr for the 310U (T-K4U) model, and 199 Cubic ft./hr for the 510U (T-D2U) model.
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Page 20: Water Connections
Installation Manual Installation -Measuring inlet gas pressure- 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 to the off position. The water heater cannot perform properly without sufficient inlet gas pressure. -
Page 21: Electrical Connections
Installation Manual Installation -Pressure relief valve- The water heater has a high-temperature shutoff switch built in as a standard safety feature (called a Hi-Limit switch) therefore a “pressure only” relief valve is required. • This unit does not come with an approved pressure relief valve. • An approved pressure relief valve must be installed on the hot water outlet. -
Page 22: Temperature Remote Controller
Installation Manual Installation TEMPERATURE REMOTE CONTROLLER -INCLUDED ACCESSORIES- Check that these items below are included with the remote controller. Temperature Screws Manual Remote controller cable remote controller* Qty: 1 Qty: 2 Qty: 1 Qty: 1 9009069005 (TM-RE42) -INSTALLATION- • This remote controller is NOT waterproof Do not install in high temperature environments, steamy conditions (such as a bath room), outdoors, in direct sunlight, or within the reach of children. - Page 23 Installation Manual Installation 3. Tighten the two "Fork terminals" beneath the two "Remote controller terminal" screws on the back of the main body. (Fig. C-1) 4. Cut out the inlet for the remote controller cable from the bottom of the main body. (Fig. C-2) 5. Place the “Main body”...
- Page 24 Installation Manual Installation 5. Pull the remote’s wires through the hole at the bottom of the water heater’s casing. 6. Properly attach the remote’s wires to the remote controller terminal on the computer board (No polarity). * Do NOT jump or short-circuit the wires, or computer will be damaged. 7. Replace Front Cover securely. 8. Wires used for the remote controller connection must be: • Minimum 20 gauge wire (No polarity) • Maximum 400 ft. (122 m) long 510U (T-D2U) model 9009069005 Fig.
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Page 25: Easy-Link System
Installation Manual Installation EASY-LINK SYSTEM (Available on the 510U (T-D2U) model only) -General- The 510U (T-D2U) model water heaters can be connected with other allowable heaters (see the table below) with communication cables to work as a multiple-unit manifold system. • The Easy-Link System allows up to 4 units to manifold together. - Page 26 Installation Manual Installation 5. Between the “PARENT” and the “CHILD-1” units: Connect the “PARENT” connector of the “PARENT” unit to the “1” connector of the “CHILD-1” unit using the supplied linking cable. 6. Between the “CHILD-1” and the “CHILD-2” units: Connect the “2”...
- Page 27 Installation Manual Installation • A remote controller is not required for an Easy-Link System, however, it does NOTICE provide for more temperature options and ease of maintenance. • If a remote controller is used, the temperature on all the units in the system will automatically be set to the same temperature that is set on the remote.
- Page 28 Installation Manual Installation CASE 3: Wrong connections between the "CHILD-1" unit and the "CHILD-2" unit • If you connect the “PARENT” connector of the “CHILD-1” unit to the “1” connector of the “CHILD-2” unit, the “CHILD-2” unit will operate as an individual unit, and will not be part of the Easy-Link System.
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Page 29: Multi-Unit System
Installation Manual Installation MULTI-UNIT SYSTEM Multiple 510U (T-D2U) models can be combined for a Multi-Unit System, along with the multi- unit controller (Parts 9008300005 (TM-MC02)) and remote controller (9008172005 (TM-RE40)). Each set of multi-unit controller and remote controller can control from 2 units to 20 units for commercial or residential applications. -
Page 30: Applications
Installation Manual Applications APPLICATIONS -Space-Heating Applications- • In order to purge air in water pipes within a closed-loop system, an air vent and air separator should be installed in the system. Required circulation flow rates are labeled next to each application diagram. These flow rate WARNING requirements must be followed. -
Page 31: Dual-Purpose Hot Water Heating
Installation Manual Installation -Dual-purpose hot water heating- (Domestic and Space Heating): Diagrammatic layout of radiant heating and domestic water heater per Mass. code. All water piping should be insulated in accordance with 780 CMR (Massachusetts energy code) 3-inch gas exhaust vent (Discharge must Cold water supply Automatic tempering device comply with local and... -
Page 32: Initial Operation
Installation Manual Initial operation INITIAL OPERATION FOR YOUR SAFETY, READ BEFORE OPERATING • Check the GAS and WATER CONNECTIONS for leaks before firing unit for the first time. • Open the main gas supply valve to the unit using only your hand to avoid any spark. Never use tools. -
Page 33: Owner's Guide
Owner's Guide Owner's Guide CONGRATULATIONS Congratulations and thank you for choosing our tankless water heater. Before use, we recommend that you read through this safety manual carefully. Please refer to the back of the manual for details about the warranty. Keep this manual for future reference. If you lose the manual, contact the manufacturer or your local distributor. -
Page 34: Operating Safety
Owner's Guide 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 35 Owner's Guide 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.
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Page 36: Normal Operation
Owner's Guide Normal Operation NORMAL OPERATION REMOTE CONTROLLER The illustration below shows an example of the display. The exact display may differ from examples. Display for Temperature "INFO" Button When the STAND BY LED is ON, the Each time the button is pressed, hot water temperature will be the operation mode is selected displayed. in the sequence of the following. Inlet water Outlet water Water... -
Page 37: Temperature Settings
Owner's Guide Normal Operation TEMPERATURE SETTINGS -Set temperature- Operation Screen Turn on the 120 VAC power supply to the unit (the water heater or the multi-unit controller). Press the "ON/OFF" button on the controller in order to turn the controller When ON, the STAND BY LED is lit. -
Page 38: Additional Features
Owner's Guide Normal Operation ADDITIONAL FEATURES -Information mode- You can get some information about the water heater condition by pressing the "INFO" button. For more information, follow the procedures below: Operation Screen First of all, inlet water temperature will be displayed on Inlet water temperature the remote controller by pressing the "INFO"... -
Page 39: Without Remote Controller
Owner's Guide Normal Operation TEMPERATURE SETTINGS ON THE PCB (WITHOUT REMOTE CONTROLLER) There are 2 preset temperatures (120 °F (50 °C) and 140 °F (60 °C)) that you can select from by changing the DIPswitch settings on the computer board without the remote controller. See the table below. When the remote controller is in normal operation, the set temperature of the remote controller is given priority over the set temperature of the DIPswitch settings. -
Page 40: Flow
• The freeze protection system will activate when the freeze protection thermostat senses air temperature below 36.5 °F (2.5 °C). • For the 110U Indoor (T-KJr2U-IN), 310U Indoor (T-K4U-IN) and 510U Indoor (T-D2U-IN) models: • In any areas subject to freezing temperatures, the manufacturer highly recommends an indoor installation with an indoor model. -
Page 41: Maintenance And Service
Owner's Guide Normal Operation MAINTENANCE AND SERVICE Turn off the electrical power supply and close the manual gas shutoff valve and the manual water control valve before servicing. WARNING • Clean the cold-water inlet filter. (Refer to Unit draining and filter cleaning section in this page.) • Be sure that all openings for combustion and ventilation air are not blocked. -
Page 42: Troubleshooting
Owner's Guide Troubleshooting TROUBLESHOOTING GENERAL PROBLEM SOLUTIONS WATER CONNECTIONS It takes long time to • The time it takes to deliver hot water from the water heater to your get hot water at the fixtures depends on the length of piping between the two. The longer fixtures. - Page 43 Owner's Guide Troubleshooting PROBLEM SOLUTIONS Unit does not ignite • Is the flow rate over 0.5 GPM (1.9 L/min)? (p. 36) when water goes • Check for the filter on cold water inlet. (p. 41) through the unit. • Check for reverse connection and cross connection. • If you use the remote controller, is the power button turned on? • Check if the inlet temperature is too high.
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Page 44: Error Codes
Owner's Guide Troubleshooting ERROR CODES -General- • The units have self-diagnostic function for safety and convenience when troubleshooting. • If there is a problem with the installation or the unit, the error code will be displayed on the remote controller. • Consult with the table on the following pages for the description of each error code. - Page 45 Owner's Guide Troubleshooting -Fault Analysis of Error Codes- If the error code is displayed on the computer board of the water heater or remote controller, please check the following. After checking, consult with the manufacturer. Green Malfunction Remote Diagnosis description One Time Incorrect DIPswitch • Check the DIPswitch settings on the PCB (Part #701).
- Page 46 Owner's Guide Troubleshooting Green Malfunction Remote Diagnosis description Two Times Air-fuel ratio rod • Check for connection/breakage of wires (Part #709) failure and/or soot on the AFR rod (Part #108). Two Times Flow sensor failure • Check for connection/breakage of wires and/or (Easy-Link System debris on the flow sensor impeller (Part #402).
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Page 47: Components Diagram
Owner's Guide Components Diagram COMPONENTS DIAGRAM Case assembly Outdoor model Indoor model Temperature remote controller Page... - Page 48 Owner's Guide Components Diagram Computer board assembly 110U (T-KJr2U) and 510U (T-D2U) model 310U (T-K4U) models Surge box assembly Page...
- Page 49 Owner's Guide Components Diagram Burner assembly Burner assembly 107 106 Manifold assembly Exhaust section (Outdoor model) Page...
- Page 50 Owner's Guide Components Diagram Water Way assembly Bypass section (510U (T-D2U)model) 510U (T-D2U) model To Water inlet section To Water outlet section Water outlet section Water inlet section Page...
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Page 51: Parts List
T-D2U models Case assembly for Indoor models 319143-428 EK103 for Outdoor models 319143-429 EK111 Front cover for 110U and 310U Indoor (T-KJr2U-IN and T-K4U-IN) 319143-430 EK110 for 110U and 310U Outdoor (T-KJr2U-OS and T-K4U-OS) 319143-431 EK123 for 510U Indoor (T-D2U-IN) - Page 52 319143-458 EK134 Exhaust port for Outdoor models 319143-219 EKK56 Heat exchanger assembly for 110U and 310U Indoor 319143-459 EK119 (T-KJr2U-IN and T-K4U-IN) for 110U and 310U Outdoor 319143-460 EK121 (T-KJr2U-OS and T-K4U-OS) for 510U Indoor (T-D2U-IN) 319143-461 EKD62 for 510U Outdoor (T-D2U-OS)
- Page 53 Owner's Guide Parts List Part # Item # Description 110U, 310U and T-KJr2U, T-K4U 510U models and T-D2U models Computer board for 110U (T-KJr2U) model 319143-469 EKJ6V for 310U (T-K4U) model 319143-470 EK106 for 510U (T-D2U) model 319143-471 EK149 Rubber grommet for Indoor models 319143-426 EK148 Surge box...
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Page 54: Output Temperature Chart
Owner's Guide Output Temperature Chart OUTPUT TEMPERATURE CHART Chart is based on properly sized gas line 110U (T-KJr2U) model Output Temperature vs. GPM (Max. 6.6 GPM) with Various Inlet Water Temperature Set Temp. (°F) 310U (T-K4U) model Output Temperature vs. GPM (Max. 8.0 GPM) with Various Inlet Water Temperature Set Temp. -
Page 55: Limited Warranty
Owner's Guide Warranty LIMITED WARRANTY 1. The manufacturer warrants this product against defects in materials or workmanship as described in this document if installed within the United States or Canada. The manufacturer or its authorized Service Representative will, at its sole discretion, repair or replace any failed or defective mechanical or electrical parts, or components thereof, or, if the manufacturer or its authorized Service Representative cannot replace said parts, and repair is not commercially practicable, the manufacturer or its authorized Service Representative will refund the purchase price. - Page 56 Owner's Guide Warranty • Freeze damage that occurs without taking proper preventive measures as described in the installation manual. • Condensate damage due to improperly installed or lack of a condensate trap (drain). • Any product not installed in compliance with all applicable local & provincial codes, ordinances, and good trade practices. • Any 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. • Any product installed in applications that cause the water heater to activate more than 300 times per day. (This averages to an activation every 5 minutes in a 24-hour period.) • Any failures that are not due to defects in materials or workmanship (mechanical and/or electrical parts). • Damages due to improper installation: • Gas: incorrect gas pipe sizing, incorrect gas meter sizing, incorrect gas type, and/or gas pressures that fall outside the product’s specified range. • Water: incorrect water pipe sizing, water pressures that fall outside the product’s specified range, recirculation flow rates that fall outside the product’s specified range (air removal), and/or lack of proper methods of air removal in a closed-loop, circulation system.