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

11  Page
WARNING FOR INSTALLATIONS
FOR YOUR SAFETY, READ BEFORE INSTALLATION:
Do not install the heater where water, debris or 
flammable vapors may get into the flue terminal. 
This may cause damage to the heater and void the 
warranty.
Do not have the vent terminal pointing toward 
any opening into a building.  Do not locate your 
heater in a pit or location where gas and water 
can accumulate.
Do not install this water heater under an 
overhang less than 3 ft. (914 mm) from its top 
or eaves.  The...

12  Page
HIGH-ALTITUDE INSTALLATIONS
Check the elevation where your water heater is installed.  Set DIPswitches shown in the table below 
depending on the altitude.
Bank of DIPswitches
110U (T-KJr2U) and 310U (T-K4U) models
                    Computer board
WARNING
DO NOT adjust any DIPswitches on the upper bank for the 510U (T-D2U) 
model.
NOTE: The dark squares indicate the direction the DIPswitches should be set to.
Lower bank of DIPswitches
   510U (T-D2U) model
       Computer board
Installation...

13  Page
VENTING INSTRUCTIONS
For indoor models
-General-
The water heater must be vented in accordance with the section “Venting of Equipment" of the latest 
edition	of	the	 National	 Fuel	Gas	Code:	 ANSI	Z223.1/NFPA	 54	in	the	 United	 States	and/or	 Section	 7	of	 the	
CAN/CSA B149.1 Natural Gas Installation Code in Canada, as well as applicable local building codes.
The manufacturer recommends the NovaVent line.  However, the following are also UL listed 
manufacturers: ProTech Systems Inc....

14   Page
-Vent length and No. of Elbows-
This is a Category III appliance and must be vented accordingly.  The vent system must be sealed airtight. 
All seams and joints without gaskets must be sealed with high heat resistant silicone sealant or UL listed 
aluminum adhesive tape having a minimum temperature rating of 350 °F (177 °C).  For best results, a vent 
system should be as short and straight as possible.
•	This water heater is a Category III appliance and must be vented accordingly with any 4 in....

15  Page
Venting Illustrations-
For the 110U Indoor (T-KJr2U-IN), 310U Indoor (T-K4U-IN) and 510U Indoor (T-D2U-IN) models
For details of the optional items, refer to the Installation  manual for each Optional item.
Horizontal Installation with 
Direct-vent concentric termination
Wall
Direct-vent concentric termination
Installation of Direct-vent 
conversion kit with water heater
Water heater
Intake port of Direct-vent conversion kit(For details see p. 10.)
Plate of Direct-vent conversion kit
Horizontal...

16  Page
-Vent termination clearances-
CanadaU.S.A
Direct-vent and other 
than Direct-vent
Direct- 
vent
Other than  
Direct-vent
AClearance above grade, veranda, porch, deck, or 
balcony1 foot1 foot1 foot
B Clearance to window or door that may be opened3 feet1 foot 
4 feet from below or 
side opening. 1 foot 
from above opening.
CClearance to permanently closed window***
D
Vertical clearance to ventilated soffit located above 
the vent terminator within a horizontal distance 
of 2 feet (61cm) from the...

17  Page
-For sidewall terminations-
-For rooftop terminations-
For multiple sidewall exhaust terminations (e.g. multi-
unit systems), an exhaust termination must be at least 1 
ft. (305mm) away from another exhaust termination.  An 
exhaust termination must also be at least 2 ft. (610 mm) 
away from an inside corner. (If the adjacent wall is less than 
2 ft. (610 mm) of length, the minimum required distance 
away from the inside corner will be equal to the length of 
that adjacent wall.)
For...

18   Page
GAS SUPPLY AND GAS PIPE SIZING
-General-
•	The minimum and maximum inlet gas pressures are:
•	Inlet gas pressures that fall outside the range of values listed above may adversely affect the 
performance of the water heater.  These pressures are measured when the water heater is in full 
operation.
•	Inlet gas pressure must not exceed the above maximum values; gas pressure above the specified range 
will cause dangerous operating conditions and damage to the unit.
•	Until testing of the main gas...

19    Page
-Natural Gas Supply Piping-
Maximum delivery capacity of cubic feet of gas per hour of IPS pipe carrying Natural Gas with 0.60 specific gravity 
based on pressure drop of 0.5" W.C.
Based on energy content of 1,000 BTU/Cubic ft.: The water heater requires 140 Cubic ft./hr for the 110U (T-KJr2U) 
model, 190 Cubic ft./hr for the 310U (T-K4U) model, and 199 Cubic ft./hr for the 510U (T-D2U) model.
Based on Energy Content of 1,000 BTU/Cubic ft:
Divide each appliance's BTU/h requirement by...

20  Page
-Measuring inlet gas pressure-
The water heater cannot perform properly without sufficient inlet gas pressure.  Below are instructions on 
how to check the inlet gas pressure.  THIS IS ONLY TO BE DONE BY A LICENSED PROFESSIONAL.
WATER CONNECTIONS
All pipes, pipe fittings, valves and other components, including soldering materials, must be suitable for 
potable water systems.
1. A manual shutoff valve must be installed on the cold water inlet to the water heater between the main 
water supply...