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  5. Installation Manual And Owner's Manual

Takagi AT-D3U-IN Installation Manual And Owner's Manual

Manual is about: On-Demand Water Heaters Series 200

Summary of AT-D3U-IN

  • Page 1

    Gas tankless water heater tm suitable for combination 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 • complies with...

  • Page 2: Contents

    2 page contents installation manual specifications .............................................4 introduction ..........................................5 safety guidelines .....................................6 safety definition ....................................6 general ...........................

  • Page 3: Installation Manual

    3 page installation manual installation manual congratulations congratulations and thank you for choosing our tankless water heater. Before use, we recommend that you read through this installation manual carefully. Please refer to the back of the manual for details about the warranty. Keep this man...

  • Page 4: Specifications

    4 page model 110u indoor (at-kjr3u- in) 110u outdoor (at-kjr3u- os) 310u indoor (at-k5u- in) 310u outdoor (at-k5u- os) 510u indoor (at-d3u- in) 510u outdoor (at-d3u- os) natural gas input (operating range) btu/h min.: 15,000 max.: 140,000 min.: 15,000 max.: 190,000 min.: 15,000 max.: 199,000 gas con...

  • Page 5: Introduction

    5 page introduction • this manual provides information necessary for the installation, operation, and maintenance of the water heater. • the model description is listed on the rating plate which is attached to the side panel of the water heater. • please read all installation instructions completely...

  • Page 6: Safety Guidelines

    6 page safety guidelines safety definition general 1. Follow all local codes, or in the absence of local codes, follow the current edition of the national fuel gas code: ansi z223.1/nfpa 54 in the usa or b149.1 natural gas and propane installation code in canada. 2. Properly ground the unit in accor...

  • Page 7: Installation

    7 page installation general 1. Follow all local codes, or in the absence of local codes, follow the current edition of the national fuel gas code: ansi z223.1/nfpa 54 in the usa or b149.1 natural gas and propane installation code in canada. 2. All gas water heaters require careful and correct instal...

  • Page 8

    8 page • installation and service must be performed by a qualified installer (for example, a licensed plumber or gas fitter). Otherwise, the warranty will be void. • the installer (licensed professional) is responsible for the correct installation of the water heater and for compliance with all nati...

  • Page 9

    9 page top back bottom side side front maintain all clearances around the water heater. Clearances optional items # model 110u indoor (at-kjr3u-in) 110u outdoor (at-kjr3u-os) 310u indoor (at-k5u-in) 310u outdoor (at-k5u-os) 510u indoor (at-d3u-in) 510u outdoor (at-d3u-os) 1. 4” backflow preventer an...

  • Page 10

    10 page the pipe cover protects the plumbing pipes to the water heater. It is fixed to the bottom of the water heater, so it hides the plumbing and improves the appearance of the installation. 3. Recess box: it allows for “clean” installations. The water heater fits inside the recess box, which hide...

  • Page 11

    11 page warning for installations for your safety, read before installation: 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 b...

  • Page 12

    12 page bank of dip switches 110u (at-kjr3u-in/os) and 310u (at-k5u-in/os) computer board note: the dark squares indicate the correct dip switch positions. Lower bank of dip switches 510u (at-d3u-in/os) computer board installation installation manual outdoor models 0 to 2,000 ft. (0 to 610 m) (defau...

  • Page 13: For Indoor Models

    13 page 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 from carbon monoxide a...

  • Page 14

    14 page • a condensate collector is required for horizontal and/or vertical vent runs exceeding 5 ft. Of equivalent length (not including sidewall terminatons). • a backflow preventor should be installed in the exhaust when the heater is installed in climates subject to freezing temperatures. Genera...

  • Page 15: -Combustion Air Supply-

    15 page -combustion air supply- • this gas water heater requires an adequate source of clean air for combustion and ventilation. Without sufficient air, your water heater may not operate properly and may emit excessive and abnormal amounts of carbon monoxide which may result in carbon monoxide poiso...

  • Page 16

    16 page calculate the air volume of the room air requirements depend on the size of the room. Room volume (ft. 3 ) = floor area (ft. 2 ) x ceiling height (ft.) if there are large objects in the room (e.G., refrigerator, furnace, car), subtract their volume from the vol- ume of the room to get a bett...

  • Page 17

    17 page calculate minimum size of vent openings and ducts the vent cross-sectional area needed to provide the free area depends on the covering on the vent openings. Typical vents use louvers or grilles to protect the opening. The louver or grill itself blocks some of the free area, so the open- ing...

  • Page 18

    18 page combustion air supply options gable vent to outdoors install above insulation outlet air to attic 1 in 2 per 4,000 btu/h inlet air from the crawl space open foundation vent confined space alternate air inlet 1 in 2 per 4,000 btu/h figure 1 - direct to outdoors openings figure 3 - vertical duc...

  • Page 19

    19 page -vent length and no. Of elbows- this is a category iii appliance and must be vented accordingly. The vent system must be sealed airtight. All seams and joints without gaskets must be sealed with high heat resistant silicone sealant or ul listed aluminum adhesive tape having a minimum tempera...

  • Page 20

    20 page -dip switch settings for vent length- single pipe with room-air intake horizontal installation wall hanger sidewall vent termination vertical condensation drain** backflow preventer* *backflow preventer (recommended for freezing weather conditions: 36 °f (2 °c) and below). **vertical condens...

  • Page 21

    21 page installation installation manual two-pipe, direct-vent installation examples vertical condensation drain** horizontal installation wall hanger hanger sidewall vent termination backflow preventer* fire stop vertical installation vertical condensation drain** backflow preventer* rain cap roof ...

  • Page 22

    22 page two-pipe, direct-vent sidewall installation single pipe with room-air intake installation installation manual horizontal installation with the 9008900005 vent kit covering wall thicknesses part# termination 9008899005 wall thimble 9008898005 termination + thimble 9008900005 110u indoor (at-k...

  • Page 23

    23 page installation installation manual -clearances for rooftop terminations- • exhaust terminations must be at least 1 ft . (305 mm) away from any obstructions. • in lieu of using roof caps, a 90 degree elbow and 45 degree elbow can be used for the exhaust, and two 90 degree elbows can be used for...

  • Page 24: -Clearances For

    24 page for multiple sidewall exhaust terminations (e.G. Multi- unit systems), an exhaust termination must be at least 1 ft. (305mm) away from another exhaust termination. An exhaust termination must also be at least 2 ft. (610 mm) away from an inside corner. If the adjacent wall is less than 2 ft. ...

  • Page 25

    25 page -vent termination clearances- canada u.S.A direct-vent and other than direct-vent direct- vent other than direct-vent a clearance above grade, veranda, porch, deck, or bal- cony 1 foot (30 cm) 1 foot (30 cm) 1 foot (30 cm) b clearance to window or door that may be opened 3 feet (91 cm) 1 foo...

  • Page 26: -General-

    26 page gas supply and gas pipe sizing -general- • minimum and maximum inlet gas pressures: • inlet gas pressures that fall outside the range of values listed above may adversely affect the performance of the water heater. These pressures are measured when the water heater is in full operation and w...

  • Page 27: -Natural Gas Supply Piping-

    27 page based on energy content of 1,000 btu/cubic ft: divide each appliance's btu/h requirement by 1,000 btu/ft 3 to get the appliance's ft 3 /h requirement. Take into account the distance the appliance is from the gas meter, then look in the above gas chart to properly size the line. For sections ...

  • Page 28

    28 page pressure port cold inlet hot outlet gas inlet as close as possible pressure relief valve installation installation manual -measuring inlet gas pressure- the water heater cannot perform properly without sufficient inlet gas pressure. Below are instructions on how to check the inlet gas pressu...

  • Page 29

    29 page -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 rel...

  • Page 30: -Installation-

    30 page temperature remote controller -included accessories-outdoor models only- it is also an optional accessory as a second remote for the indoor models. The optional remote con- troller doesn't come with the remote cable. Refer to p. 9. Mounting and wiring the remote controller 1. Take off the “ ...

  • Page 31

    31 page installation installation manual 3. Crimp the "fork terminals" to the cable. (fig. C) 4. Tighten the two "fork terminals" beneath the two "remote controller terminal" screws on the back of the main body. (fig. D-1) 5. Cut out the inlet for the remote controller cable from the bottom of the m...

  • Page 32

    32 page easy-link system available on the 510u (at-d3u-in/os) model only the 510u (at-d3u-in/os) 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 t...

  • Page 33

    33 page 7. Between the “child-2” and the “child-3” units: connect the “2” connector of the “child-2” unit to the “1” connector of the “child-3” unit. 8. Verify that all cables are connected like the diagram (b). 9. Turn on power to the “parent” unit. Next, turn on “child-1” . When the controller* in...

  • Page 34

    34 page installation installation manual • the parent/child dip switch, no.1 on the lower bank of dip switches, should be in the off position. • t his is the connection diagram between 510u (at-d3u-in/os) and multi-unit controller for 2 to 20 water heaters. Above is an example showing seven water he...

  • Page 35: Applications

    35 page applications space-heating applications recirculation *the recirculation pump is to be controlled by: -dual-set aquastat (recommended w/timer) • the aquastat's differential should be a minimum of 10 °f (5 °c). *the recirculation pump is to provide no less than 2 gpm (7.5 l/min) and no more t...

  • Page 36

    36 page • 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. • follow all local codes, or in the absence of local codes, follow the current edition of the national standard code, ansi...

  • Page 37: Initial Operation

    37 page initial operation operation 1. Once the above checks have been completed, please clean the filter of any debris. Refer to p. 46 for instructions. 2. Fully open the manual water control valve on the water supply line. 3. Open a hot water tap to verify that water is flowing to that tap. Then c...

  • Page 38: Owner'S Guide

    38 page owner's guide congratulations congratulations and thank you for choosing our tankless water heater. Before use, we recommend that you read through this owner's guide carefully. Please refer to the back of the manual for details about the warranty. Keep this manual for future reference. If yo...

  • Page 39: Operating Safety

    39 page operating safety operating safety owner's guide 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 appliance does not have a pilot. It is equipped with an ignition device which automatical...

  • Page 40

    40 page operating safety owner's guide a pressure relief valve listed as complying with the standard for relief valve and automatic gas shutoff devices for hot water supply system, ansi z21.22 ・ csa 4.4, shall be installed at the time of installation of the water heater in the location specified by ...

  • Page 41: Normal Operation

    41 page normal operation general • when the remote controller is installed, it will take priority over the built-in controller. • the controller has an energy saving mode. Five minutes after the water heater stops operating, the backlight of the controller turns off. • the backlight of the remote wi...

  • Page 42

    42 page temperature settings -set temperature- normal operation owner's guide operation screen on the controller built-in controller remote controller 1. Turn on the 120 vac power supply to the unit (the water heater or the multi-unit controller). 2. Press the "on/off" button on the controller in or...

  • Page 43

    43 page -additional features- information mode you can get some information about the water heater's condition by pressing the "info" button. For more information, follow the procedures below: the controller has a function that can change units of temperature and flow rate from °f to °c and from gal...

  • Page 44

    44 page temperature settings on the pcb without controller there are two preset temperatures, 120 °f (50 °c) and 140 °f (60 °c), that you can select by changing the dip switch settings on the computer board without the controller. See the table below. When the controller is in normal operation, the ...

  • Page 45

    45 page flow • this unit comes equipped with heating blocks to protect it against damages associated with freezing. • for this freeze protection system to operate, there has to be electrical power to the unit. Damage to the heat exchanger caused by freezing temperatures due to power loss is not cove...

  • Page 46

    46 page unit draining and filter cleaning maintenance and service • clean the cold-water inlet filter. (refer to "unit draining and filter cleaning" on this page.) • be sure that all openings for combustion and ventilation air are not blocked. • the venting system should be checked annually for any ...

  • Page 47: Troubleshooting

    47 page troubleshooting general problem solutions tempera ture and amount of ho t w ater it takes a long time to get hot water at the fixtures. • the time it takes to deliver hot water from the water heater to your fixtures depends on the length of piping between the two. The longer the distance or ...

  • Page 48

    48 page problem solutions w ater he ater unit does not ignite when water goes through the unit. • is the flow rate over 0.5 gpm (1.9 l/min)? (p. 41) • check the filter on the cold water inlet. (p. 46) • check for reverse connection and cross connection. • if you use the remote controller, is the pow...

  • Page 49

    49 page troubleshooting owner's guide error code error codes -general- • the units have self-diagnostic functions 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 built-in controller or remote controll...

  • Page 50

    50 page -for the 510u (at-d3u-in/os) model in an easy-link system- error codes will be displayed differently with units installed within an easy-link system, not only to show what the error code is, but to also indicate which unit within the system has the error code. Below is a sample of how the er...

  • Page 51

    51 page -fault analysis of error codes- if the error code is displayed on the computer board of the water heater or the controller, please check the following. After checking, consult with the manufacturer . Troubleshooting owner's guide remote green led malfunction description diagnosis 031 one fla...

  • Page 52

    52 page troubleshooting owner's guide remote green led malfunction description diagnosis 510 six flashes abnormal main gas solenoid valve • check for connection/breakage of wires (part #708) and/ or burn marks on the computer board (part #701). 551 six flashes abnormal gas solenoid valve • check for...

  • Page 53: Components Diagram

    53 page components diagram components diagram owner's guide case assembly 006 004 052 052 003 052 003 001 001 005 007 007 715 002 052 050 704 052 050 050 050 704 710 008 008 002 built-in temperature controller 722 721 065.

  • Page 54: Computer Board Assembly

    54 page 510u (at-d3u-in/os) 110u (at-kjr3u-in/os) and 310u (at-k5u-in/os) 701 705 103 402 402 707 713 403 714 709 708 711 705 103 709 402 402 711 707 714 407 408 708 701 064 713 712 712 721 721 computer board assembly surge box assembly components diagram owner's guide 120 705 053 062 706 703 068 70...

  • Page 55: Burner Assembly

    55 page components diagram owner's guide burner assembly 153 154 103 401 103 054 118 053 105 106 112 708 401 150 117 116 121 062 114 701 102 119 101 107 707 152 151 057 063 062 062 067 062 055 056 052 055 053 111 113 061 110 711 711 714 053 053 057 060 109 115 054 702 053 108 104 122 122 104 053 053...

  • Page 56: Water Way Assembly

    56 page components diagram owner's guide water way assembly c d a b b a 458 462 403 456 460 411 459 454 413 450 450 450 463 452 452 059 412 414 453 066 462 417 461 401 460 456 458 458 414 416 451 414 451 402 404 407 406 405 460 456 458 461 052 415 058 454 457 052 d 408 410 409 415 058 454 455 052 c ...

  • Page 57: Parts List

    57 page parts list owner's guide parts list item # description part # 110u, 310u and 510u models at-kjr3u-in/os, at-k5u-in/os and at-d3u-in/os 001 case assembly for indoor models for outdoor models n/a n/a ek596 ek597 002 front cover for indoor models for outdoor models n/a n/a ek598 ek599 003 004 0...

  • Page 58

    58 page item # description part # 110u, 310u and 510u models at-kjr3u-in/os, at-k5u-in/os and at-d3u-in/os 118 119 burner gasket burner holder gasket 319143-568 319143-569 ek567 ek568 120 121 122 surge box plate pcb fixing plate thermostat 319143-176 n/a 319143-185 ek436 ek603 ekj59 130 131 lp conve...

  • Page 59

    59 page item # description part # 110u, 310u and 510u models at-kjr3u-in/os, at-k5u-in/os and at-d3u-in/os 701 computer board for 110u (at-kjr3u-in/os) model for 310u (at-k5u-in/os) model for 510u (at-d3u-in/os) model 100270582 100270583 100270584 ek611 ek612 ek613 702 703 704 remote fixing plate fo...

  • Page 60: Output Temperature Chart

    60 page output temperature chart chart is based on properly sized gas line 110u (at-kjr3u-in/os) output temperature chart owner's guide *when the set temperature is 130 °f (55 °c) or higher, maximum flow rate is limited to 8.0 gpm. Output temperature vs. Gpm (max. 6.6 gpm) with various inlet water t...

  • Page 61: Limited Warranty

    61 page 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 defecti...

  • Page 62

    62 page • 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, ordinan...

  • Page 63

    63 page this page is intentionally left blank..

  • Page 64

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