Takagi T-KJr2U-IN User manual
Gas Tankless Water HeaterTM
Suitable for potable water heating and space-heating*
* Please refer to local codes for space-heating compliance.
FEATURING
(510U (T-D2U) models only)
Models
WARNING
On-Demand Water Heater
Installation Manual and Owner’s Guide
110U Outdoor (T-KJr2U-OS)
310U Outdoor (T-K4U-OS)
510U Outdoor (T-D2U-OS)
110U Indoor (T-KJr2U-IN)
310U Indoor (T-K4U-IN)
510U Indoor (T-D2U-IN)
CONTENTS
Installation Manual
4
5
6
7
7
9
9
9
9
12
13
18
20
21
22
25
29
30
32
Owner's Guide
34
36
36
37
40
40
41
41
42
42
44
47
51
54
55
Contents
Installation Manual
CONGRATULATIONS
Model 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)
Natural Gas Input
Gas Connection
Water Connections
Water Pressure*
Natural gas
Inlet Pressure
Manifold
Pressure**
Weight
Dimensions
Ignition
Electric
SPECIFICATIONS
should not need adjustment
NOTE:
The manufacturer reserves the right to discontinue, or change at any time, specifications or designs
without notice and without incurring obligations.
5
INTRODUCTION
SAFETY GUIDELINES
SAFETY DEFINITION
GENERAL
1.
2.
3.
4. GAS TYPE, GAS PRESSURE, WATER PRESSURE and ELECTRIC
RATING
do not install and consult with the manufacturer
5.
WARNING
WARNING
CAUTION
Safety Guidelines
DANGER
INSTALLATION
GENERAL
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
INCLUDED ACCESSORIES
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 national, state / provincial,
and local codes.
The manufacturer does not recommend installing the water heater in a pit or
location where gas and water can accumulate.
The manufacturer does not recommend installing the water heater in an attic
due to safety issues
WARNING
The warranty will not cover damage caused by water quality.
The manufacturer recommends using the direct-vent kit when the water
heater is installed in a beauty salon
the
manufacturer does not recommend installing the unit on a wall adjacent to a
bedroom, or a room that is intended for quiet study or meditation, etc
CAUTION
Model Top Bottom Front Back Sides
CLEARANCES
#Model
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)
✓✓✓
✓✓✓
✓✓✓✓✓✓
✓✓✓
✓✓✓
✓✓✓
INCLUDED ACCESSORIES
Installation manual
and owner’s guide
Temperature
remote controller kit*
Communication cable
510U (T-D2U) models only
1. 4” Backflow preventer and F-F adaptor:
9007996005
2. Direct-vent conversion kit: 9007667005
(TK-TV10)
3. Pipe covers: 9007670005 (TK-PC01)
4. Recess box: 9007674005 (TK-RB02)
5. Sidewall vent terminator (Hood) and Wall thimble kit: 9008004005 and 9008005005
Wall thimble (4"-7")
9008004005
Termination (5"-10")
9008005005
6. Direct-vent concentric termination
Part# Covering wall thicknesses
WARNING FOR INSTALLATIONS
FOR YOUR SAFETY, READ BEFORE INSTALLATION:
ProhibitedProhibited
HIGH-ALTITUDE INSTALLATIONS
110U (T-KJr2U) and 310U (T-K4U) models
Computer board
WARNING
DO NOT adjust any DIPswitches on the upper bank for the 510U (T-D2U)
models.
NOTE:
510U (T-D2U) models
Computer board
Indoor models
0 (DEFAULT) Up to 2,500 ft Up to 5,000 ft Up to 7,500 ft Over 7,500 ft
(Lower bank of
DIPswitches)
OFF
ON 12345678910
OFF
ON 12345678910
OFF
ON 12345678910
OFF
ON 12345678910
OFF
ON 123456
OFF
ON 123456
OFF
ON 123456
OFF
ON 123456
Altitude
DIPswitches
Outdoor models
0 (DEFAULT) Up to 2,000 ft Up to 4,000 ft Up to 6,000 ft Over 6,000 ft
(Lower bank of
DIPswitches)
OFF
ON 12345678910
OFF
ON 12345678910
OFF
ON 12345678910
OFF
ON 12345678910
OFF
ON 123456
OFF
ON 123456
OFF
ON 123456
OFF
ON 123456
Altitude
DIPswitches
VENTING INSTRUCTIONS
For indoor models
-General-
The manufacturer recommends the NovaVent line.
General rules for venting water heaters are:
General rules for vent terminations:
any air intake devices
DANGER
CAUTION
-Vent length and No. of Elbows-
without gaskets
Follow the vent pipe manufacturer’s instructions when installing the vent pipe.
Do not common vent this appliance with any other vented appliance.
-DIPswitch settings for Vent length-
For Indoor and direct-vent models
Vent type Diameter Max. No. of Elbows Max. Vertical and Horizontal (Total) Vent Length
5
5
*For each elbow added, deduct 5 ft. (1.5m) from max. vent length.
No. of Elbows Max. Vertical or Horizontal Vent Length
5
110U Indoor (T-KJr2U-IN)
310U Indoor (T-K4U-IN)
510U Indoor (T-D2U-IN)
(Upper bank of DIPswitches) Vent length
0 to 7 ft
8 to 50 ft
(DEFAULT)
OFF
ON 12345678
OFF
ON 12345678
OFF
ON 123456789 10
OFF
ON 123456789 10
For the 110U Indoor (T-KJr2U-IN), 310U Indoor (T-K4U-IN) and 510U Indoor (T-D2U-IN) models
conversion kit with water heater
* * *
***
* * *
* * *
* * *
* *
* *
*
* *
V
V
V
V
V
V
V
V
V
V
X
X
X
H
.
CAUTION
GAS SUPPLY AND GAS PIPE SIZING
-General-
NOTICE
Gas type Inlet gas pressure
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.
The manufacturer is not liable for any property and/or personal
damage resulting from gas conversions
CAUTION
Based on energy content of 1,000 BTU/Cubic ft.: The water heater requires 140 Cubic ft./hr for the 110U (T-KJr2U)
models, 190 Cubic ft./hr for the 310U (T-K4U) models, and 199 Cubic ft./hr for the 510U (T-D2U) models.
Pipe size Length
Diameter 10' 20' 30' 40' 50' 60' 70' 80' 90' 100' 125' 150' 200'
3/4"
1"
1 1/4"
1 1/2"
2"
Unit: Cubic feet per hour
Water
heater
Gas meter
AB
C
3/4" Pipe size
Gas sizing example
(Natural Gas)
THIS IS ONLY TO BE DONE BY A LICENSED PROFESSIONAL
WATER CONNECTIONS
1.
2.
CAUTION
3.
4.
Cold
inlet
Hot
outlet
Gas
inlet
As Close as
Possible
Pressure relief valve
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