Bradford White BRADFORD WHITE EVERHOT TG-150I-N(X) Service manual

238-48022-00D 7/11
Bradford White EverHotTankless Gas Water Heater
For Interior Installation
TG-150I-N(X), TG-180I-N(X), TG-199I-N(X), TG237I-N(X) & TG-237I-N(X)A
INSTALLATION AND OPERATION INSTRUCTION MANUAL
With Troubleshooting Guide
PLACE THESE INSTRUCTIONS ADJACENT TO WATER HEATER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE
Do not store or use gasoline or other
flammable vapors and liquids in the vicinity of this
or any other appliance
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance.
Do not touch any electrical switch; do not use
any phone in your building.
Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
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 gas supplier.
WARNING: If the information in these
instructions is not followed exactly, a fire or
explosion may result causing property
damage, personal injury or death
Ambler, PA 19002
Tech. Service [phone]
Service Part [phone]
Warranty Service [phone]
A Spanish language version of these instructions is available by
contacting Bradford White.
La versión espãnola de estas instrucciones se puede obtener al
escribirle a la fábrica cuyo nombre aparece en la placa de.

2
SECTION I: IMPORTANT INFORMATION
TABLE OF CONTENTS
I IMPORTANT INFORMATION ......... 2 VII ELECTRICAL CONNECTIONS ... 49
II SPECIFICATIONS .......................... 6 VIII OPERATING INSTRUCTIONS.... 60
III INSTALLATION
INSTRUCTIONS ............................. 9
TEMPERATURE
ADJUSTMENT............................. 62
IV WATER CONNECTIONS.............. 13 IX MAINTENANCE........................... 68
V VENTING ...................................... 22 X PARTS LIST ................................ 72
VI GAS CONNECTIONS ................... 46 XI WARRANTY ................................ 88
This gas-fired water heater is design certified by CSA International under the American
National Standard, Z21.10.3 (as indicated on the rating plate) and CAN/CGA 4.3-M (as
indicated on the rating plate) available from CSA Standards Association, 5060 Spectrum
Way, Mississauga, Ontario, Canada L4W 5N6.
This water heater must be installed in accordance with local codes. In the absence of local
codes, it must be installed in compliance with the National Fuel Gas Code (ANSI Z223.1-
Latest Edition), or in Canada CAN/CGA B149.1 Natural Gas Installation Code (Latest Edition)
or CAN/CGA B149.2 Propane Installation Code (Latest Edition).
The following terms are used throughout this manual to bring attention to the presence of
hazards at various risk levels, or to important information concerning product life.
READ CAREFULLY
Indicates special instructions on
installation, operation or
maintenance, which are
important but not related to
personal injury hazards.
NOTICE
Indicates a potentially
hazardous situation, which, if
not avoided, could result in
death, serious injury or
substantial property damage.
WARNING
Indicates potentially hazardous
situation, which, if not avoided,
may result in moderate or minor
injury or property damage.
CAUTION
Indicates an imminently
hazardous situation, which, if
not avoided, will result in death,
serious injury or substantial
property damage.
DANGER
This water heater has a limited warranty. The warranty for this water heater is valid only if the
water heater has been installed, maintained, and operated in accordance with these
instructions.
NOTICE

3
DO NOT store or use gasoline or other flammable, combustible, or corrosive vapors and/or
liquids in the vicinity of this or any other appliance.
Failure to properly install the vent and air intake (if applicable) system could result in property
damage, personal injury, or death.
DO NOT install any damaged venting system components. If damage is evident, please
contact the supplier where the water heater was purchased or the venting manufacturer.
Use only authorized terminals for venting this water heater.
This water heater is equipped with an adjustable thermostat to control water temperature.
Hot water temperatures required for automatic dishwasher and laundry use can cause scald
burns resulting in serious personal injury and/or death. The temperature at which injury
occurs varies with the person’s age and the time of exposure. The slower response time of
disabled persons increases the hazards to them. NEVER allow small children to use a hot
water tap, or to draw their own bath water. NEVER leave a child or disabled person
unattended in a bathtub or shower.
DANGER
Improper installation, adjustments, alteration, service or maintenance can cause property
damage, personal injury or loss of life. Failure to follow all instructions in the proper order can
cause personal injury or death. Read and understand all instructions, including all those
provided with the appliance before installing, starting-up, operating, maintaining or servicing
this appliance. Keep this manual and literature in legible condition with this water heater for
reference by owner and service technician.
This water heater requires regular maintenance and service to operate safely. Follow the
instructions contained in this manual.
Installation, maintenance, and service must be performed only by a qualified, skilled and
knowledgeable installer or service provider.
Installation is not complete unless a pressure relief valve is installed into the proper location
in the hot water outlet piping of this water heater.
It is the responsibility of the installing contractor to see that all controls are correctly installed
and are properly operating when the installation is complete.
This water heater is NOT suitable for installation on combustible flooring. Install water heater
exactly as shown in this manual.
DO NOT operate this water heater without first being certain it is filled with water.
WARNING

4
DO NOT tamper with or alter the water heater and/or controls.
DO NOT operate water heater with jumpered or absent controls or safety devices.
DO NOT operate water heater if any external part has been under water. Immediately call a
qualified service technician to inspect the water heater and to replace any part of the control
system including gas controls, which has been under water.
DO NOT attempt to use this water heater with any gas other than the type listed on the rating
plate. Do not attempt to convert this water heater for use with a gas other than the type for
which it is equipped. Failure to use the proper gas can create an unsafe condition resulting in
property damage, bodily injury, or death. Consult your local gas supplier or gas company if
there are any questions.
DO NOT operate this water heater if the input rate exceeds the rate shown on the water
heater rating plate.
This water heater contains very hot water under high pressure. Do not unscrew any pipe
fittings nor attempt to disconnect any components of this water heater without positively
assuring the water is cool and is not under pressure. Always wear protective clothing and
equipment when installing, starting up or servicing this water heater to prevent scald injuries.
Do not rely on the temperature gauges to determine the temperature. Do not touch any
components unless they are cool.
This water heater must be properly vented and connected to an approved vent system in
good condition. DO NOT operate water heater with the absence of an approved vent system.
A clean and unobstructed vent system is necessary to allow noxious fumes that could cause
injury or loss of life to vent safely and will contribute toward maintaining the water heater’s
efficiency.
This water heater is for indoor installation only. A venting system must be used to supply
outdoor air for combustion to the water heater.
This water heater requires its own separate venting system. DO NOT connect the exhaust
vent into an existing vent pipe or chimney.
Water heater materials of construction, products of combustion and the fuel contain carbon
monoxide, nitrogen oxides, aldehydes and/or other toxic or harmful substances which can
cause death or serious injury and which are known to the state of California to cause cancer,
birth defects and other reproductive harm. Always use proper safety clothing, respirators and
equipment when servicing or working nearby this water heater.
WARNING

5
Liquefied petroleum gases/propane gas is heavier than air and will remain at floor level if
there is a leak. Basements, crawl spaces, closets and areas below ground level will serve as
pockets for accumulation of leaking gas. Before lighting, smell all around the appliance area
for gas. Be sure to smell next to the floor.
IF YOU SMELL GAS:
DO NOT try to light any appliance.
DO NOT touch any electric switch; do not use any telephone in your building.
Immediately call your gas supplier from a telephone in another building. Follow the gas
supplier’s instructions.
If you cannot reach your gas supplier, call the fire department.
DO NOT OPERATE THE APPLIANCE UNTIL THE LEAKAGE IS CORRECTED!
WARNING
Flammable items, pressurized containers or any other potential fire hazardous articles must
never be placed on or adjacent to the water heater. Open containers of flammable material
must not be stored or used in the same room with this water heater.
DO NOT USE AN INSULATION BLANKET WITH THIS WATER HEATER. This water heater
meets or exceeds the ASHRAE/IES 90.1b (latest edition) standards with respect to insulation
and standby loss requirements.
WARNING

6
SECTION II: SPECIFICATIONS
Table 1. Specifications.
* Minimum flow may vary slightly depending on the temperature setting and the inlet water temperature.
** For commercial and hydronic applications requiring higher temperatures. Requires the use of an optional controller
(P/N 239-47805-00).
Bradford White Corporation is continually updating and improving products. Therefore, specifications are subject to
change without prior notice.
The maximum inlet gas pressure must not exceed the value specified by the manufacturer. The minimum value
listed is for the purpose of input adjustment.
Model TG-150I-N(X) TG-180I-N(X) TG-199I-N(X) TG-237I-N(X) TG-237I-N(X)A
Minimum Rate Btu/h 15,000 19,000
Maximum Rate Btu/h 150,000 180,000
199,000 Natural
Gas
190,000
Propane
237,000
Flow Rate (Min-Max) *
0.6-5.0 GPM
(2.3-18.9
L/min)
0.6-7.5 GPM
(2.3-28.4 L/min)
0.6-9.4 GPM
(2.3-35.5 L/min)
0.6-9.8 GPM
(2.3-37 L/min)
Flow Rate (45F rise) 5.0 GPM
(18.9 L/min)
6.7 GPM
(25.4 L/min)
7.1 GPM
(27.0 L/min)
8.5 GPM
(32.2 L/min)
Default Temperature Setting 104°F (40°C)
Maximum Temp Setting (commercial **) 160°F (71°C) 180°F (82°C) 185°F (85°C)
Maximum Temp Setting (residential) 120°F (49°C)
Minimum Temperature Setting 96°F (36°C) 98°F (37°C)
Weight 50 lb (23 kg) 55 lb (25 kg)
Energy Factor 0.82 0.82 0.82 N/A
Thermal Efficiency 84%
Noise level (inside rating) 49 dB
Electrical
Consumption
Normal 53 W 65 W 79 W 99 W
Standby 2 W
Anti-frost
Protection 100 W 100 W 116 W
By-Pass Control Fixed Electronic
Minimum Gas Supply
Pressure
Natural Gas 5.0 inch W.C.
Propane 8.0 inch W.C.
Maximum Gas Supply
Pressure
Natural Gas 10.5 inch W.C.
Propane 13.5 inch W.C.
Type of Appliance Direct Vent, Temperature controlled continuous flow gas water heater
Operation With or without remote controls, mounted in kitchen, bathroom, etc.
Approved Gas Type Natural Gas or Propane-Ensure unit matches gas type supplied at the installation location.
Connections Gas Supply: 3/4" MNPT, Cold Water Inlet: 3/4" MNPT, Hot Water Outlet: 3/4" MNPT
Ignition System Direct Spark Ignition
Electric Connections Water Heater: AC 120 Volts, 60Hz. Remote Control: DC 12 Volts (Digital)
Water Temperature Control Simulation Feedforward and Feedback
Minimum Water Supply Pressure 20 PSI (Recommended 30-80 PSI for maximum performance)
Maximum Water Supply Pressure 150 PSI
Remote Control Cable Non-Polarized Two Core Cable (Minimum 22 AWG)
ENERGY STAR®Qualified Yes (Both U.S. and Canada) No

7
Dimensions
Table 2. Water Heater Dimensions (Approx.).
DIM DESCRIPTION
TG-150I-N(X)
TG-180I-N(X)
TG-199I-N(X)
in. (mm)
TG-237I-N(X)
TG-237I-N(X)A
in. (mm)
A Width 14 (355.6) 18 1/2 (470)
B Depth * 9 5/8 (244.5) 9 1/8 (230.5)
C Height - Unit 22 7/8 (582) 23 5/8 (600)
D Height - with brackets 25 1/2 (648.2) 25 1/8 (639.8)
E Hot Water Outlet - from wall * 3 5/8 (91) 4 3/8 (110)
F Hot Water Outlet - from center 4 3/8 (110) 2 3/8 (61)
G Cold Water Inlet - from wall * 2 7/8 (70) 3 3/4 (94)
H Cold Water Inlet - from center 1 1/8 (27) 2 (52)
I Gas Connection - from wall * 4 3/8 (109) 2 1/8 (56.2)
J Gas Connection - from center 3 1/2 (89) 4 3/8 (110)
K
From base to gas connection 1 5/8 (40) 1 5/8 (40)
From base to cold connection 2 (50) 2 (50)
From base to hot connection 1 5/8 (41) 1 5/8 (41)
L Air intake to exhaust n/a 6 (152.4)
* This is the minimum dimension from the wall. The wall bracket is adjustable to allow an additional 1 5/8 in. (40 mm).
TG-150I-N(X), TG-180I-N(X), TG-199I-N(X) TG-237I-N(X), TG-237I-N(X)A

8
Figure 1. Graph Showing Pressure Drop v. Water Flow Rate.
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
0 25 50 75 100 125 150
Figure 2. Graph Showing Water Flow Rate v. Temperature Rise.
TG-150I-N(X) TG-237I-N(X)
TG-237I-N(X)A
TG-199I-N(X)TG-180I-N(X)
Pressure Drop (psi)
Water Flow Rate (gpm)
Pressure Loss (ft head)
TG-237I-N(X & TG-237I-N(X)A
TG-199I-N(X)
TG-180I-N(X)
TG-150I-N(X)
Water Flow Rate (gpm)
Temperature Rise (°F)

9
SECTION III: INSTALLATION INSTRUCTIONS
CAUTION
If building cold water supply has a back-flow preventer, check valve or water meter with check valve,
provisions for thermal expansion of water in the hot water system must be provided.
WARNING
Pressure relief valve discharge piping must be piped near floor to eliminate potential of severe
burns. Do not pipe in any area where freezing could occur. Do not install any shut-off valves, plugs
or caps to the temperature and pressure relief valve or piping.
WARNING
This water heater must be located in an area where leakage of the heat exchanger coil, water line
connections, or the pressure relief valve will not result in damage to the area adjacent to the water
heater or to lower floors of the structure. When such locations cannot be avoided, a suitable drain
pan must be installed under the water heater. The drain pan depth must be suitable for draining and
collecting water, and have a minimum length and width of at least four (4) inches (10.2 cm)
measured from the jacket of the water heater. The drain pan, as described above, can be
purchased from your plumbing professional. The drain pan must be piped to an adequate drain.
The piping must be at least ¾ inch (1.9 cm) in diameter and pitched for proper drainage.
WARNING
INSTALLATION OF THIS WATER HEATER REQUIRES ABILITY EQUIVALENT TO THAT OF A
LICENSED PLUMBER. Plumbing, air supply, venting, gas supply and electrical work are required.
DO NOT ATTEMPT TO LIGHT ANY GAS APPLIANCE IF YOU ARE NOT CERTAIN OF THE
FOLLOWING:
Liquefied petroleum gases/propane gas and natural gas have an odorant added by the gas
supplier that aids in detection of the gas.
Most people recognize this odor as a “sulfur” or “rotten egg” smell.
Other conditions, such as “odorant fade” can cause the odorant to diminish in intensity, or
“fade”, and not be as readily detectable.
If you have a diminished sense of smell, or are in any way unsure of the presence of gas,
immediately contact your gas supplier from a telephone in another building.
Gas detectors are available. Contact your gas supplier or plumbing professional for more
information.
Liquefied petroleum gases/propane gas is heavier than air and will remain at floor level if there is a
leak. Basements, crawl spaces, closets and areas below ground level will serve as pockets for
accumulation of leaking gas. Before lighting, smell all around the appliance area for gas. Be sure
to smell next to the floor.
IF YOU SMELL GAS:
Do not try to light any appliance.
Do not touch any electric switch; do not use any telephone in your building.
Immediately call your gas supplier from a telephone in another building. Follow the gas
supplier’s instructions.
If you cannot reach your gas supplier, call the fire department.
DO NOT OPERATE THE APPLIANCE UNTIL THE LEAKAGE IS CORRECTED!

10
WARNING
UNPACKING
INSPECT SHIPMENT carefully for any signs of damage.
1. All equipment is carefully manufactured, inspected and packed.
2. Any claims for damage or shortage in shipment must be filed immediately with Bradford White
Corporation and noted on the Bill of Lading.
WATER HEATER LOCATION
1. The TG series water heaters may be vented either horizontally through an outside wall or
vertically through the roof using the venting components designed for this water heater. Contact
your Bradford White supplier or those suggested in this manual to order the required venting
components. The venting system should be as short as possible. Refer to the Venting System
Installation section of this Installation and Operation Instruction Manual for the vent terminal
location restrictions before choosing a final location for the water heater.
2. The water heater must be installed on a wall capable of supporting at least 55 pounds (25 kg).
Locate the water heater at a height convenient for servicing and above the reach of small
children.
3. Refer to Table for minimum clearances to combustibles.
4. If the water heater is installed in a confined space, such as a closet, ventilation air must be
provided to prevent increased room temperature. Excessive ambient temperatures surrounding
the water heater may shorten the life of the controls.
REMOVE CARTON
Move water heater to a location near where it will be installed. Carefully slide water heater out from the
carton and remove all the contents.
DANGER
Temperature setting should not exceed safe temperature at fixtures. See water temperature control
warning in the “Temperature Adjustment” section of this Installation and Operation Instruction
Manual. If higher preheat temperatures are necessary to obtain adequate booster output, add an
ASSE approved mixing valve for hot water supplied to fixtures.
WARNING
Residential use water heaters are suitable for potable water heating only. DO NOT use a
residential use water heater for space heating or combination space heating/domestic water
heating. Commercial use water heaters may be used for space heating or combination space
heating/domestic water heating. Refer to the instructions for space heating in this Installation
and Operation Instruction Manual.
This water heater is not suitable for use in pool or spa applications.
The water heater must be installed indoors using the proper venting system components for
combustion air supply and discharging flue products to the outdoors. Contact the supplier of
this water heater or Bradford White for venting components.
DO NOT operate this water heater without the vent piping connected.
All pipe joints should be taped to help prevent leakage around joints.