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T-KJr. T-KJr.

Instantaneous Water Heater
Installation Manual and Owners Guide
Flash Water Heater
Model T-KJr.
Suitable for potable water heating and/or space heating
FEATURING
ENDLESS HOT WATER
ON DEMAND
COMPACT, SPACE SAVING
ENERGY CONSERVING
COMPUTER CONTROLS
COMPUTERIZED SAFETY
NO PILOT LIGHT
Takagi Industrial Co. USA Inc.
3-B Goodyear
Irvine, CA 92618
Toll Free (888) 882-5244
www.takagi-usa.com
FOR YOUR SAFETY
- This product
must be installed and serviced by a
professional service technician or licensed
plumber or gas fitter when installed in the
Commonwealth of Massachusetts and/or
any other State. Warning
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.
WARNING
: If the information in this
manual is not followed exactly, a fire or
explosion may result, causing property
damage, personal injury or death.
Do not store or use gasoline or other
flammable vapors or liquids in the
vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
Do not use any appliance.
Do not touch any electrical
switch
;
do not use any phone in
your building.
Immediately contact your gas
supplier from another location.
Follow the gas suppliers
instructions.
If you cannot reach your gas
supplier, call the fire
department.
Installation and service must be
performed by a qualified installer,
service agency or the gas supplier. 1
Table of Contents
Specifications..
1
For Your Safety...
2
Operation.
3
General
3
Turning It On
3
Turning It Off
3
Temperature
3
Flow..
4
Freeze Protection...
4
Installation
5
General
5
Accessories.
5
Electrical Connections...
5
Wiring Diagram
6
Temperature Settings.
6
Gas Supply Plumbing
7
Water Plumbing.
8
Pressure Relief Valve.
8
Wall Hanging Installation...
9
Outdoor Installation.
9-10
Indoor Installation...
10-11
Combustible Air Supply.
10
Exhaust Venting.
10-11
Manufactured Home (Mobile Home)
Installation....
11
Indoor
11
Outdoor.
11
Initiating the Appliance...
11
Initial Operation......
12
Space Heating Application..
13
Dual Purpose Heating.
14
Applications
15
TKJr with Storage Tank...
15
TKJr with Recirculation...
15
Before Operating..
16
Danger
17
Maintenance.
18
Troubleshooting / Errors Codes... 18-19
Optional Items
20
TK-RE01..
20
TK-BK01..
20
TK-TV01...
20
TK-TV03...
20
Parts Diagram.
21-22
Parts Lists..
23
Flow Chart
24
Specifications
Natural Gas Input
Min. 19,500 Btu
Max. 140,000 Btu
LPG Input
Min. 17,000 Btu
Max. 140,000 Btu
Gas Connection
¾ NPT
Water Connections
¾ NPT
Water Pressure
Min. 15 psi
Max. 150 psi
Natural Gas Pressure Inlet Min. 5 WC
Max. 10.5 WC
LP Gas Pressure Inlet
Min. 11 WC
Max. 14 WC
Manifold Pressure
Natural 2.9 WC
Propane 3.2 WC
Weight
30 lbs.
Dimensions
20x14x6
Ignition
Electronic Ignition
Electrical Supply
AC 120 V
*** Inlet gas pressure must not exceed the
above maximum values. For gas pressures lower than 5 WC for
natural gas, call the manufacturer. Before installing in areas over 4,500 feet
above sea level, contact the manufacturer
for high altitude adjustment instructions. Check the rating plate to insure this
product matches your specifications. Takagi - USA is constantly improving our
products; therefore specifications are
subject to change without prior notice. 2
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. Properly ground the unit in accordance with all
local codes, or in the absence of local codes,
with the National Electrical Codes, ANSI/NFPA
70 in the USA or CSA standard C22.1 Canada
Electrical Code Part 1 in Canada.
3. Carefully plan where to install your Flash
Water Heater. Insure that your heater will have
enough combustible air, proper ventilation, and
locate your heater where water leakage will not
do damage to surrounding areas. If there is a
possibility of water damage, install a suitable
drain pan under the unit, which will not restrict
combustible airflow.
4. Check the rating plate for the correct gas type,
gas pressure, water pressure, and electrical
rating. Do not install this unit if these
requirements cant be met.
5. If a problem should occur, turn off all hot water
taps and turn off the gas. Call a trained
technician, the Gas Company, or the
manufacturer.
WARNING:
Do not disconnect the electrical
supply if the temperatures will be near freezing.
The Freeze Prevention Device will only work if the
unit has proper electrical power. The Freeze
Prevention Device is rated

for temperatures down
to 5º F (-15º C) in a wind free environment. The
wind chill factor will cause the Flash Water Heater
to freeze and be damaged at temperatures above
5º F (-15º C). Refer to the sections on Winterizing
and the Freeze Prevention Device for more
information.
6.
WARNING:
Before bathing or showering
always check the water temperature. Do not
leave children or the infirm unsupervised in the
shower or bath. The water temperature is set
at 120º F (50º C) from the factory to maximize
the amount of hot water you can use. Water
temperature over 125º F can cause severe
burns instantly or death from scalds.
7.
WARNING:
Do not use this appliance if any
part has been underwater. Immediately call a
certified and trained technician to inspect and
service the unit if necessary.
8.
WARNING:
Do not store or use gasoline or
other flammable vapors or liquids in the vicinity
of this or any other appliance.
9.
WARNING:
Do not reverse the water and gas
connections, this will damage your heater and
can cause severe injury or death from scalds.
Follow the diagram below when installing your
Flash water heater.
Rating plate
Cold In
Hot Out
Gas 3
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 Flashs flow sensor
detects that hot water is needed, and automatically
commands the computer to electronically ignite the
burners, and heat water. During operation, the
computer monitors the water temperature and flow
rate, and controls the gas flow and fan speed to
maintain a constant output temperature. After the
burners are ignited the fire on lamp will be lit.
0.75 gallons per minute is required to turn the
burners on, but after the burners are ignited, the
flow rate can drop to 0.60 gallons per minute
without the burners turning off.
As long as water, gas and electricity are
connected, there will be an endless supply of hot
water. To turn on your water heater, just open a
tap. To turn the heater off, just close the tap.
Turning It On
To turn on the Flash water heater
1. Open a hot water tap, or turn on water
demanding appliance.
2. Unit will detect flow, burners will ignite, and
Fire On lamp will light up on computer board.
3. If necessary, mix in cold water to get a
comfortable temperature.
Turning It Off
To turn off the Flash water heater
1. Close the hot water tap, or turn appliance off.
2. Flow will diminish and unit will shut off.
3. Fire On lamp will go out.
Temperature
The output temperature of the T-KJr. has been
factory set to maintain a maximum of 120
°
F (50
°
C). This is electronically controlled by the
computer and can be adjusted with a TK-RE01
temperature controller. Further adjustment may be
made by mixing in cold water with the hot to obtain
the ideal water temperature.
The maximum possible flow rate out of the unit is
dependent on ground water temperature and the
temperature setting chosen. Consult the flow
charts on the last page of this unit to determine the
possible outlet temperature and flow rate
combinations.
WARNING:
Temperatures above 125º F (52º C)
can cause severe burns or death from scalding.
Children, the disabled and the elderly are at a high
risk of being injured. Feel the water temperature
before bathing or showering. Do not leave
children, disabled persons, or the elderly
unsupervised.
Lamp is lit
Lamp is lit
extinguished 4
Flow
The flow rate through the T-KJr. is limited to a
maximum of 5.8 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-KJr. is