American Water Heater Condensing UltraLow NOx Indoor 120000 BTU Liquid Propane GT140PIH User Manual

							31  Page
IF YOU SMELL GAS:
•	Do not try to start the water heater
•	Do not touch any electric switches; 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
WARNING
Operation
1.Once the above checks have been completed, please clean filter 
of any debris  Refer to p 41 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 close the hot water tap
4.Fully open the manual gas control valve installed
5.Turn on the 120 VAC, 60 Hz power supply to the water heater 
6.Now you are ready to enjoy hours of endless hot water
•	Check the GAS and WATER CONNECTIONS for leaks before firing unit for the first time
•	Open the main gas supply valve to the water heater using only your hand to avoid any spark  
Never use tools  If the knob will not turn by hand, do not try to force it; call a qualified service 
technician  Forced repair may result in a fire or explosion due to gas leaks
•	Be sure to check for the presence of leaking gas toward the bottom of the water heater because 
some gases are heavier than air and may settle towards the floor 
•	Check the GAS PRESSURE Refer to p 20 and 22
•	Do not try to light the burner manually  It is equipped with an electronic ignition device which 
automatically lights the burner
•	Check for PROPER VENTING and COMBUSTION AIR to the water heater
•	Purge the GAS and WATER LINES to remove any air pockets
•	Do not use this appliance if any part has been under water   Immediately contact a qualified 
installer or service agency to replace a flooded water heater  Do not attempt to repair the unit!  
It must be replaced!
FOR YOUR SAFETY, READ BEFORE OPERATING
INITIAL OPERATION
Installation
Installation Manual  
						

							32  Page
OPTIONAL ITEMS
#Model 140
Indoor
(T-H3M-DV) 140
Outdoor
(T-H3M-OS)
1
Temperature Remote Controller✓Included with the  water heater
2Pipe Cover✓ ✓
3Neutralizer Kit✓✓
44-inch Exhaust Sidewall Vent Terminator (Hood) 
and 4-inch Wall Thimble ✓
53-inch Concentric PVCTermination✓
6 Recess Box✓
The pipe cover protects the plumbing pipes to 
the water heater from unexpected adjustments 
This pipe cover is fixed to the bottom of the water 
heater, which hides the plumbing and improves 
the visual aspects of the whole installation for the 
water heater
The temperature remote controller has three functions  It allows the output temperature from the 
water heater to be adjusted within the range of 100 °F to 140 °F, and also works as a diagnostic 
tool and will provide a concise error code whenever there is a problem with the water heater   The 
temperature options are 100 °F, 105 °F, 110 °F, 115 °F, 120 °F, 125 °F, 130 °F, 135 °F, and 140 °F   See 
the troubleshooting Section for information on possible error codes
1. Temperature Remote Controller: 
9009069005 (TM-RE42)
2. Pipe Cover: 9008953005 (TH-PC04)3. Neutralizer Kit: 9007607005 (TH-NT01)
The neutralizer assembly neutralizes 
the condensate (acidic water) that 
forms in the secondary heat exchanger 
of the water heater
It connects to the condensate 
drain port of the water heater by 
using connectors included with the 
neutralizer kit  Refer to p 23 and 24  
for the details
Installation
Installation Manual  
						

							33  Page
Used when terminating direct-vent (sealed combustion) 
systems, with Indoor models that require a 3 in (76 mm) 
intake and a 3 in (76 mm) exhaust  This concentric 
termination provides the convenience of only having to 
make one penetration through a sidewall instead of two 
separate penetrations for the intake and exhaust piping The 
termination includes a bird screen, restricting small animals, 
pests, and foreign objects from entering into the vent system 
4. 4-inch Exhaust Sidewall Vent Terminator (Hood) and 4-inch Wall Thimble:
They are used when venting out through the wall  These terminations are special stainless steel 
vents for gas appliances and are UL listed as Category II, III and IV  For different wall thicknesses, 
there are two ranges of lengths available (Refer to the NovaVent brochure for details) Install these 
vent terminations in accordance with their installation instructions and any applicable local codes
DiscriptionPart#
4" Wall Thimble (4"-7")9008345005
4" Wall Thimble (5"-10")9008346005
4" Exhaust Sidewall Vent Terminator (Hood) 9007999005
4" Exhaust Sidewall Vent Terminator (Hood) 
+ 4" Wall Thimble (4"-7")9008004005
4" Exhaust Sidewall Vent Terminator (Hood) 
+ Wall Thimble (5"-10")9008005005
4-inch Exhaust SidewallVent Terminator(Hood)
4-inchWall Thimble
5. 3-inch Concentric PVC Termination: 9007611005 (TH-CVPVC33)
Installation
Installation Manual
6. Recess Box
The Recess box will allow for "clean" installations
The water heater fits inside the recess box, which hides 
and protects the whole water heater and plumbing
The Recess box will fit in-between most wall studs  
						

							34  Page
Owner's Guide
CONGRATULATIONS
Congratulations and thank you for choosing our tankless water heater 
Before use, we recommend that you read through this safety manual 
carefully  Please refer to the back of the manual for details about the 
warranty   Keep this manual for future reference
If you lose the manual, contact the manufacturer or your local 
distributor   When you call, please tell us the model number and the 
serial number of your unit written on the rating plate of the water 
heater
Owner's Guide  
						

							35  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 automatically 
lights the burner   Do not try to light the burner by hand
B  BEFORE OPERATING smell all around the appliance area for gas Be sure to smell next to the 
floor because some gas is heavier than air and will settle on the floor  
       WHAT TO DO IF YOU SMELL GAS
										•	 Do	not	try	to	light	any	appliance.
										•	 Do	not	touch	any	electric	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.
C  Use only your hand to turn the gas shutoff valve  Never use tools  If the valve will not turn 
by hand, don’t try to repair it, call a qualified service technician  Force or attempted repair may 
result in a fire or explosion
D  Do not use this appliance if any part has been under water   Immediately contact a qualified 
installer or service agency to replace a flooded water heater  Do not attempt to repair the unit!  
It must be replaced!
1 STOP!  Read the safety information above on this label
2 Turn off all electric power to the appliance
3 Do not attempt to light the burner by hand
4 Turn the gas shutoff valve located on the outside of the unit to the closed position
5 Wait five (5) minutes to clear out any gas  If you then smell gas, STOP!  Follow “B” in the 
safety information above on this label  If you don’t smell gas, go to the next step
6 Turn the gas shutoff valve located on the outside of the unit to the open position
7 Turn on all electrical power to the appliance
8 If the appliance will not operate, follow the instructions in “To Turn Off Gas to Appliance,” and 
call your service technician or gas supplier
1 Turn off all electric power to the appliance if service is to be perform\
ed
2 Turn the gas shutoff valve located on the outside of the unit to the clo\
sed position
  FOR YOUR SAFETY READ BEFORE OPERATING
OPERATING INSTRUCTIONS
TO TURN OFF GAS TO APPLIANCE  
						

							36  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 Z2122 ・ CSA 44, shall be installed at the time of installation of the water heater 
in the location specified by the manufacturer   Local codes shall govern the installation of relief devices for safety 
operation of the water heater  The relief valve must not be removed or plugged
No valve shall be placed between the relief valve and the water heater   The relief from the discharge of the pressure 
relief valve shall be disposed of in a suitable place where it will cause no damage  Also, there shall be no other 
reducing coupling or other restrictions installed on the discharge line to restrict flow 
See Installation Manual heading “PRESSURE RELIEF VALVES” for installation and maintenance of relief valve discharge 
line and other safety precautions
Vapors from flammable liquids will explode and catch fire causing death or severe burns. 
Do not use or store flammable products such as gasoline, solvents or adhesives in the same room or area near 
the water heater
Keep flammable products:
1 Far away from heater 
2 In approved containers
3 Tightly closed and out of reach of children
4 Water heater has a main burner, which may come 
on at any time and will ignite flammable vapors
Vapors:
1 Cannot be seen
2 Are heavier than air
3 Go a long way on the floor 
4 Can be carried from other rooms to the main 
burner by air currents
Do not install water heater where flammable products will be stored or used 
unless the main burner is at least 18” above the floor  This will reduce, 
but not eliminate the risk of vapors being ignited by the main burner 
Read and follow water heater warnings and instructions.  If the owner’s manual is missing, contact the retailer or manufacturer.
  
Flammable Vapors
FLAMMABLES
1 Water temperature over 125°F (52°C) can cause severe burns instantly or death from scalds
2 Children, disabled and elderly are at highest risk of being scalded
3 Feel water before bathing or showering
4 Temperature limiting valves are available  See manual
5 The outlet temperature of the water heater is set at 120°F (50°C)  If you require water temperatures below this 
setting, follow the instruction manual
6 Use this heater at your own risk  Test the water before bathing or showering  Do not leave children or an infirm 
person unsupervised  See your local water supply company [plumbing hardware retailer] for temperature limiting 
valves that are available
BRÛLURE
BURN
CHAUDE
CHAUDE
HOT
HOTCHAUDEHOT
DANGER
DANGER  
						

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DISPLAY OF THE CONTROLLER
The	illustration	below	shows	an	example	of	the	display	of	the	controllers.		The	exact	display	may	differ	from	examples.
•	Flow rate to activate the water heater: 05 gallon per minute at the default set  
             temperature (19 L/min)
•	Flow rate to keep the water heater running: 04 gallon per minute (15 L/min)
•	The controllers have an energy saving mode  Five minutes after the water heater 
stops operating, the backlight of the controller turns off  
•	The backlight of the controller will turn back on once the water heater begins 
firing again
•	This water heater is an on-demand, tankless water heater designed to efficiently 
supply endless hot water without reference to temperature settings
1. Open a cold water
fixture
2. Mix hot water with the cold water 
to get the correct temperature water
3. When finished, close 
the water fixture
NORMAL OPERATION
°F100105110115120*125130135140
°C3840434550*52555760
 *Factory setting (Default)
TEMPERATURE TABLE OF THE CONTROLLER
"COLD" Button
"HOT" Button
Press the "HOT" button or the "COLD"  button to set the hot water temperature
"ON/OFF" Button
Press this button to start or stop operation
STAND BY LED (Orange)
The indicator turns on when the heater is ready for operation
IN USE LED (Green)
The indicator lights during combustion
When the STAND BY LED is ON, the hot water set temperature will be displayed
Display for Temperature"INFO" Button
Each	time	the	button	is	pressed,the	operation	mode	is	selectedin the following sequence
Inlet watertemperatureOutlet watertemperatureWater	flow
The controllers indicate the remote controller (9009069005/TM-RE42) and the 
temperature controller attached to a surface of the 140 Indoor (T-H3M-DV) model NOTICE
Normal Operation
Owner's Guide
GENERAL
Temperature above 125 °F (52 °C) can cause severe burns or death from scalding 
Children, disabled and the elderly are at high risk of being injured
CAUTION  
						

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TEMPERATURE SETTINGS
-Using controller-
-Temperature setting on the PCB-
(Without controller)
There are 2 preset temperatures (120 °F (50 °C) and 140 °F (60 °C)) that you can select from by changing 
the DIPswitch settings on the computer board without the controller  See the table below
When the controller is in normal operation, the set temperature of the controller is given
priority over the set temperature of the DIPswitch settings  If the remote becomes disabled, the com-
puter will refer to the setting of this DIPswitch
• The temperature has been preset at the factory to 120 °F (50 °C).Computer board
Bank of
DIPswitches
NOTE:  Only change the switches with dark squares  The dark squares
             indicate the direction the DIPswitches should be set to
120 °F (50 °C) 
DEFAULT140 °F (60 °C) 
No 9 : OFFNo 9 : ON
OFF
ON123 4567 8910
OFF
ON1 23 4567 8910
Normal Operation
Owner's Guide
OperationScreen on the controller
1.Turn on the 120 VAC power supply to the water heater 
2.Press the "ON/OFF" button on the controller in order to 
turn the controller on
3.When ON, the STAND BY LED is lit
4.It shows the set temperature on its display as shown in 
the picture on the right (EX: 120 °F)
5.
Press the "HOT" button or the "COLD" button to set the 
temperature setting of the unit
Increasing temperature 
from 120 °F (50 °C) to 125 °F (52 °C) :
1 The water heater must be Stand By to increase the
    temperature
2 Press the "HOT" button to set 120 °F (50 °C)
3 Press and hold the "INFO" button and the "HOT"
    button for at least 3 seconds  The remote will emit a
    beep and change to 125 °F (52 °C)
4 Press the "HOT" button to set up to 140 °F (60 °C)
(EX: 120 °F)  
						

							39  Page
OperationScreen on the controller
1.Inlet water temperature will be displayed on the 
controller by pressing the "INFO" button
2.Outlet water temperature will be displayed on the 
controller by pressing the "INFO" button
3.Water flow rate, in gpm, will be displayed on the 
controller by pressing the "INFO" button
4.Press the "INFO" button to finish information mode
Inlet water temperature
(EX: 60 °F)
Outlet water temperature
(EX: 120 °F)
Water flow
(EX: 35 GPM)
-Information mode-
-Unit conversion mode-
When the water heater is connected with the remote controller, the tempe\
rature 
controller will not operate temperature settings, as only work for the i\
nformation 
mode (Indoor model only)
OperationScreen on the controller
1.Press the "ON/OFF" button on the controller in 
order to turn the controller on
2.When ON, the orange LED is lit
3.The previous set temperature will be displayed on 
the screen
4.Press the "INFO" buttons for at least 3 seconds
5.The set temperature should now be displayed in the 
alternate unit of measurement
(EX: 100 °F)
(EX: 38 °C)
ADDTIONAL FEATURES
You can get some information about the water heater condition by pressing the "INFO" button  For more 
information, follow the procedures below:
The controller display information can be changed from English Units to SI / metric units
Please follow the procedures below: 
Normal Operation
Owner's Guide  
						

							40  Page
FLOW
•	This water heater comes equipped with heating blocks to protect it against damage associated with 
freezing
•	For this freeze protection system to operate, there has to be electrical power to the water heater  
Damage to the heat exchanger caused by freezing temperatures due to power loss is not covered 
under the warranty  In cases where power losses can occur, consider the use of a backup power supply 
•	The freeze protection system will activate when the freeze protection thermostat senses air temperature below 
365 °F (25 °C)  
•	For the 140 Indoor (T-H3M-DV) model:
•	In any areas subject to freezing temperatures, the manufacturer highly recommends an indoor 
installation with an indoor model  In such an installation, freezing issues can only occur if cold 
air enters through the venting into the heat exchanger, whether by negative pressures within 
the installation location or by strong outside winds
•	The manufacturer also highly recommends the use of a backflow preventer (sold separately)
       to minimize the amount of cold air entering through the exhaust venting when the water
       heater is off
•	It is the installer’s responsibility to be aware of freezing issues and take all preventative measures  The 
manufacturer will not be responsible for any damage to the heat exchanger as a result of freezing
•	If you will not be using your heater for a long period of time:
  1.   Completely drain the water out of the water heater  Refer to p 41
  2.   Disconnect power to your heater
 This will keep your water heater from freezing and being damaged
Only pipes within the water heater are protected by the freeze protection 
system Any water pipes (hot or cold) located outside the water heater will not 
be protected Properly protect and insulate these pipes from freezingCAUTION
FREEZE PROTECTION SYSTEM
Appliance/UseFlow rate
GPM (US)L/min
Lavatory Faucet1038
Bath Tub40 – 100152 - 378
Shower2075
Kitchen Sink1556
Dishwasher1556
Washing machine40152
Household Flow Rates
Taken from UPC 2006
•	The flow rate through the water heater is limited to 
a maximum of 70 GPM (265 L/min)
•	The temperature setting, along with the supply 
temperature of the water will determine the flow 
rate output of the water heater 
•	Please refer to the temperature vs gallons per 
minute charts on p 54 to determine the likely flow 
rates based on your local ground water temperature 
and your desired outlet water temperature
•	Refer to the table to the top right for typical
      household plumbing fixture flow rates to determine
     what the water heater can do in a household
     application
•	Based on the United States Department of Energy 
     method of testing water heater output, the water
     heater is rated for gallons per minute (GPM) (liters 
     per minute (L/min)) for Natural Gas and Propane, 
     when raising the water temperature by 77 °F
     (43 °C) (from 58 °F to 135 °F (14 °C to 57 °C)) 
     See the chart on the right
Unit: GPM (L/min)
ModelFlow rate
140 (T-H3M) Indoor30 (112)Outdoor
Normal Operation
Owner's Guide