American Water Heater NonCondensing UltraLow NOx Outdoor Natural Gas GT110UNE user manual

31  Page
•	Priority Control Devices such as a flow switch, an Aquastat or other 
electronic controller can be used to prioritize the domestic water system over 
the heating system.
•	Follow all local codes, or in the absence of local codes, follow the most recent 
edition	of	the	 National	 Standard	 Code,	ANSI	Z21.10.3.
•	This illustration is a concept design only.  The reference to the 1/8th hole 
in check is only for the State of Massachusetts.  There are a wide variety 
of variations to the...

32   Page
INITIAL OPERATION
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...

33    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 product name and the 
serial number of your unit written on the rating plate of the water...

34  Page
OPERATING SAFETY
FOR YOUR SAFETY READ BEFORE OPERATING
A. This water heater does not have a pilot.  It is equipped with an ignition device that automatically 
lights the burner.  Do not try to light the burner by hand.
B. BEFORE OPERATING smell all around the water heater area for evidence of leaking 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...

35    Page
DANGER
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.
WARNING
The outlet hot water temperature of the water heater is factory set at 120 °F (50 °C).
Use this heater at your own risk.  The set outlet water temperature can cause severe burns instantly or 
death from scalding.  Test the water before bathing or...

36   Page
NORMAL OPERATION
GENERAL
REMOTE CONTROLLER
The	illustration	below	shows	an	example	of	the	display.		The	exact	display	may	differ	from	examples.
"HOT" Button
"COLD" Button
"ON/OFF" Button
Press the "HOT" button or the 
"COLD" button to set the hot 
water temperature.
When the STAND BY LED is ON, the 
hot water temperature will be 
displayed.
Display for Temperature
Press this button to 
start or stop operation.
"INFO" Button
STAND BY LED (Orange)...

37    Page
TEMPERATURE SETTINGS
-Set temperature-
TEMPERATURE TABLE OF REMOTE CONTROLLER
Normal Operation
Owner's Guide
°F100105110115120*125130135140
°C3840434550*52555760
a) For 110U (T-KJr2U) and 310U (T-K4U) models
°F100105110115120*125130135140145150155160 
°C3840434550*5255576063656870
b) For 510U (T-D2U) model
 *Factory setting (Default): 120 °F
OperationScreen
1.Turn on the 120 VAC power supply to the unit (the water heater or 
the multi-unit controller).
2.Press the "ON/OFF" button...

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ADDITIONAL FEATURES
-Information mode-
You can get some information about the water heater condition by pressing the "INFO" button.  For more 
information, follow the procedures below:
The remote controller has a function that can change units of temperature and flow rate from °F to °C and 
from gallon per minute to liter per minute and vice versa, please follow the procedures below:
Outlet water temperature
OperationScreen
1.Press the "ON/OFF" button on the remote in order to...

39    Page
TEMPERATURE SETTINGS ON THE PCB
(WITHOUT REMOTE 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 remote controller.  See the table below.
When the remote controller is in normal operation, the set temperature of the remote controller is given 
priority over the set temperature of the DIPswitch settings.
NOTE:  Only change the switches with dark squares.  The dark...

40   Page
FLOW
•	This unit comes equipped with heating blocks to protect it against damages associated with freezing.
•	For this freeze protection system to operate, there has to be electrical power to the unit.  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...