Whirlpool T-K2 User Manual
T-K2 Instantaneous Water Heater
Installation Manual and Owner’s Guide
Flash Water Heater
Model T-K2
Suitable for potable water heating and space heating
FEATURING
• ENDLESS HOT WAT ER
• ON DEMAND
• COMPACT, SPACE SAVING
• ENERGY CONSER VING
• COMPUTER CONTROLS
• COMPUTERIZED SAFETY
• NO PILOT LIGHT
Takagi Industrial Co. USA Inc.
6 Goddard
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 person, qualified in water
heater installation. 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 st o re or us e g asoli ne 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
in your building.
Immediately contact your gas
•
supplier from another
location. Follow the gas
supplier’s instruc tio n s.
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.
, do not use any phone
Table of Conten t s
Specifications…………………………….. 2
For Your Safety…………………………... 3
Operation…………………………………. 4
General…………………………… 4
Turning It On……………………… 4
Turning It Off……………………… 4
Temperature……………………… 4
Flow……………………………….. 4
Freeze Protection………………... 5
Installation………………………………… 6
General…………………………… 6
Accessories………………………. 6
Electrical Connections…………... 6
Wiring Diagrams…………………..7,8
Gas Supply Piping………………. 9
Water Plumbing………………….. 10
Pressure Relief Valve……………. 10
Wall Hanging Installation………... 11
Standing Installation……………... 11
Outdoor Installation……………… 11
Indoor Installation………………... 12
Combustible Air Supply…. 12
Exhaust Venting…………. 13
Manufactured Home (Mobile Home)
Installation……………….………... 13
Indoor……………………… 13
Outdoor……………………. 13
Initiating the Appliance…………... 14
Initial Operation…………………... 14
Space Heating Application……….. 15
Applications………………………. 19
Storage Tank……………... 19
Recirculation……………… 19
Maintenance……………………………… 20
Troubleshooting………………………….. 20-22
Optional Items……………………………. 23
TK-RE01………………………….. 23
TK-BK01………………………….. 23
TK-TV01…………………………... 23
TK-TV03…………………………... 23
TK-TV04…………………………… 23
Dipswitch Settings………………………... 24
Indoor NG Dipswitch Settings…… 24
Outdoor NG Dipswitch Settings…. 24
Indoor LP Dipswitch Settings……. 25
Outdoor LP Dipswitch Settings….. 25
Exploded Diagrams………………………. 26-29
Parts List………………………………….. 30
Flow Chart……………………………….. 31
Specifications
Natural Gas Input Min. 20,000 Btu
Max. 185,000 Btu
LPG Input Min. 19,000 Btu
Max. 175,000 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 2.3” WC
Propane 2.5” WC
Weight 60 lbs.
Dimensions 24.5”x16.5”x8.3”
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.
For Your Safety
PLEASE READ THIS MANUAL CAREFULLY
AND FOLLOW IT EXACTLY FOR YOUR
SAFETY.
1. Follow all l ocal codes, or in t he abs enc e 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/NFP A 70 in the US A 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 can’t be met.
Device will only work if the unit has pro per
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.
7. 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 temperat ure 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.
8. 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.
9. WARNING: Do not store or use gasoli ne or
other flammable vapors or liquids in the
vicinity of this or any other appliance.
10. 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
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.
6. WARNING: Do not disconnect the
electrical supply if the temperatures will be
near freezing. The Freeze Prevention
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
Flash’s 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 t urn the
burners on, but after the burners are ignited,
the flow rate can drop to 0.6 gallons per
minute without the burners turning off.
As long as water, gas and electricity are
connected, there will be an endless flow 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,
“Fire On” lamp will light up.
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, unit will shut off.
3. “Fire On” lamp will go out.
Temperature
The output temperature of the T-K2 has been
factory set for a maximum 120° F (50° C).
This is electronically controlled by the
computer and can be adjusted with a TKRE01 temperature controller, or with the
dipswitches on the computer board (See pgs.
21-22 for dipswitch settings). Further
adjustment may be made by mixing in cold
water with the hot to obtain the ideal water
temperature.
The flow rate possible out of the unit is
dependent on 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.
Flow
The flow rate through the T-K2 is limited to a
maximum of 6.9 GPM. The temperature
setting, along with the supply temperature of
the water will determine the f low rate the unit
puts out. Consult the flow charts on the last
page of this manual to determine t he possible
outlet temperature and flow rate combinations.
Based on the United States Department of
Energy method of testing water heater output,
the T-K2 is rated for 240 gallons per ho ur, or
4.0 GPM, at a 77° F rise above the inlet
temperature. Refer to the following chart of
typical household flow rates to determi ne what
the T-K2 can do in a household application.
Remember that for bathing, cold water will be
mixed for a comfortable temperature,
increasing the flow output rate.
Household Fl ow Rates
Appliance / Use
Lavatory Faucet 1.0
Bath Tub 4.0
Shower 2.0
Kitchen Sink 1.5
Dishwasher 1.5
Washing Machine 2.0
Taken from UPC 1997
Freeze Prevention
Flow Rate
(GPM)
This unit comes equipped with heaters that
discourage the unit from freezing. For this
freeze prevention system to operate there has
to be electrical power to the unit.
The f reeze preven tion devi ces will not work if
the electrical power source is disconnected.
The unit has been rated for temperatures
down to 5º F (-15º C) in a wind free
environment. The wind chill factor will cause
the unit to freeze at temperatures above 5º F
(-15º C), even if the unit is installed indoors.
For indoor installation in areas where the
temperature will be well below freezing for
extended periods of time, use the thermostat
extension cable to extend the internal
thermostat to the outdoors, and install a TKTV03 backflow prevention kit so that cold air
will not backflow into the flue and cause the
unit to freeze. Do not install the water heater in
an area with extrem ely cold we ather. Thi s will
void your warranty and Takagi Industrial Co.
USA Inc. will not be responsible for any
damage that occurs.
WARNING: The pipe heaters are located on
the Flash Water Heater only. Any hot or cold
water pi pes loc ated ou tside of the uni t will not
be protected. Properly protect and insulate
these pi pe s from fr ee zing.
If the heater will not be in use for a long period
of time or if the temperatures will drop below
5º F (-15º C) with the wind chill factor, turn off
heater and drain the unit of water. This applies
to indoor and outdoor installations. This will
keep the unit from freezing and being
damaged.
Follow these instructions carefully:
1. Turn off the power supply to the Flash
Water Heater.
2. Close manual gas control valve.
3. Close manual water shut off valve.
4. Open all hot water taps in the house.
(Bathroom, kitchen, laundry room, etc.).
When the water flow has ceased, close all
hot water taps.
5. Have a bucket or pan ready to catch the
water f rom the unit’s drain plugs . Remove
the drai n pl ugs t o dra in the wa te r out of t he
unit.
6. Let drain for 5 minutes.
7. Securely screw the drain plugs back into
place.
Follow these steps when it is again safe to use
the water heater:
1. Make sure all hot water taps are closed
and the drain plugs are securely attached.
2. Purge the water line of debris.
3. Open manual water control valve located
on the water supply line.
4. Open all the hot w ater taps to verify water
flows to the taps. Close hot water taps.
5. Op en manual gas control valve located on
the gas supply line.
6. Turn on the power supply to the Flash
Water Heater.
Installation
This section is for the installer. The
installer is responsible for the correct
installation of your Fla sh Wat er H ea ter.
For Your Safety: Only a certified and
trained service technician or qualified
plumber may service or install your
product.
Please ke ep this owner’s ma nual in a safe
place for future reference. Copies of this
manual are available from TAKAGI-USA
General
All gas water heaters require careful and
correct installation to ensure safe and efficient
operation. This manual must be followed
exactly.
1. Read the For Your Safety section in the
beginning of this manual.
2. This unit is not capable of being used as a
pool or spa heater.
3. The regulator is preset at the factory. It is
computer controlled and should not need
adjustment.
4. Suitable for potable water heating only.
Well wa ter or h ard water m ay cause s cale
problems that will not be covered by the
manufacturer’s warranty.
5. Maintain pr oper spac e for servi cing. Inst all
the unit so that it can be connected or
removed easily.
6. Install so that the electrical power can be
switched off if necessary.
7. Avoid installing in an area with high levels
of dust, sand or debris. Particles may clog
the air vent, reduce fan function, or cause
improper combustion.
8. Do not install the unit where the exhaust
vent is pointing into any opening in a
building or where the noise may disturb
your neighbors.
Accessories
Check that all the parts listed below were
included with the unit.
Electrical Connections
The T-K2 requires a 60 Hz 120 VAC electrical
power supply, and it should be properly
ground ed in accordance wit h the most rec ent
edition of the National Electrical Code,
ANSI/NFPA 70 and any local codes. In
Canada, all electrical wiring to the heater
should be installed in accordance with the
Canadi an Electri cal Code, CSA C22.1 Part 1,
and any l ocal c odes. Do not r ely on the g as or
water piping to ground the metal parts of the
heater.
CAUTION: Label all wires prior to
disconnection when servicing controls. Wiring
error can cause improper and dangerous
operation. Verify proper operation after
servicing.
• A means for switching off the 120 VAC
power supply must be pr ovided.
Wire the heater exactly as shown in the
•
wiring diagram.
A green screw is provided in the junction
•
box for the grounding connection.
Refer to the following wiring diagrams. Wiring
diagrams are also printed on the inside panel
Wiring Diagrams
of the appliance.
Elect r ical Rat ing
120 VAC, 60 Hz, 0.8 A.
Note : I f a n y of t he o ri gi n al wi ring sup pl i e d w i th th i s ap pl i ance mus t be r epl ac e d, i t m u st be r epl aced
with appliance wiring material (180c) or its equivalent. Wires are available through the manufacturer.
Gas Supply Piping
Check the rating plate to make sure that the
unit was built for the type of gas available in
the area.
The gas supply piping should be sized
according to the Applicable Plumbing Code for
a maximum draw of 185,000 BTUH. First
determine the effective length of the gas
supply line by measuring the actual length of
piping, and then adding 5 f t. f or ev ery elbow or
“T” to the actual length. Use the charts below
to determine the pipe diameter necessary to
accommodate the BTU demand of the unit. If
there are more gas drawing appliances on the
line, si ze a cco r din g to the ma xi mu m amoun t o f
BTU demand.
The gas supply pressures must be within the
ranges of the following chart:
Natural Gas
Supply Pressure
Propane Gas
Supply Pressure
Insufficient gas supply pressure can cause the
Flash Water Heater to lose efficiency or not
work at all.
Min. 5” WC
Max. 10.5” WC
Min. 11” WC
Max. 14” WC
WARNING: Fire or e xplosio n may resul t if the
maximum supply pressures are exceeded.
The manifold gas pressure should be at
maximum 2.3” WC for natural gas, and 2.5”
WC for propane.
Always use approved connectors to connect
the unit to the gas line. Always purge the gas
line of any debris before connecting to the
water heater.
WARNING: Conversion of this unit from
natural gas to propane or propane to natural
gas cannot be done in the field. Contact your
local retailer or distributor to get the correct
unit for your gas type.
Always install a manual shutoff valve on the
gas supply line in case of an emergency, or if
service or maintenance is necessary.
This appliance and its individual shut-off valve
must be isolated from the gas supply piping
system by unplugging the unit and turning off
the main gas valve during any pressure testing
of the gas supply piping system at test
pressures equal to or less than ½ PSI.
When all of the connections have been made,
check the gas line for leaks. Apply soapy
water to all gas fittings and connections, if
bubbles form, there may be a leak.
Natural Gas Supply Piping
Based on 0.60 specific gravity for natural gas at .5” WC pressure drop
DOE standard is 1100 BTU per cubic ft. of natural gas
Pipe
Size
Length 10’ 20’ 30’ 40’ 50’ 60’ 70’ 80’ 90’ 100’ 125’ 150’ 200’
½” 174 119 96 82 73 66 61 56 53 50 44 40 34
¾” 363 249 200 171 152 138 127 118 111 104 93 84 72
1” 684 470 377 323 286 259 239 222 208 197 174 158 135
1 ¼” 1404 965 775 663 588 532 490 456 428 404 358 324 278
1 ½” 2103 1445 1161 993 880 798 734 683 641 605 536 486 416
2” 4050 2784 2235 1913 1696 1536 1413 1315 1234 1165 1033 936 801
Cubic Feet of Natural Gas
Propane Supply Piping
Based on 11” WC supply pressure
Pipe
Size
Length 10’ 20’ 30’ 40’ 50’ 60’ 70’ 80’ 90’ 100’ 125’ 150’ 200’
½” 275 189 152 129 114 103 96 89 83 78 69 63 55
¾” 567 393 315 267 237 217 196 185 173 162 146 132 112
1” 1071 732 590 504 448 409 378 346 322 307 275 252 213
1 ¼” 2205 1496 1212 1039 913 834 771 724 677 630 567 511 440
1 ½” 3307 2299 1858 1559 1417 1275 1181 1086 1023 976 866 787 675
2” 6221 4331 3465 2992 2646 2394 2205 2047 1921 1811 1606 1496 1260
kBTU of Propane
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