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

21  Page
Installation
Installation Manual
-Natural Gas Supply Piping-
Maximum delivery Capacity of Cubic Feet of Gas per Hour of IPS Pipe carrying Natural Gas with 060 Specific Gravity 
Based on Pressure Drop of 05" WC
Based on Energy Content of 1,000 BTU/Cubic ft.: The water heater requires 120 Cubic ft./hr for the 140 (T-H3M) 
model.
-Propane (LP) Supply Piping-
Maximum Capacity of Propane (LP) Based on 11" W C supply pressure at a 05" W C pressure drop...

22  Page
Installation
Installation Manual
-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...

23  Page
Installation
Installation Manual
Follow all code requirements 
of the local authority on 
condensate neutralizers and 
whether or not they are required 
for the installation
Condensate drain port
-Pressure relief valve-
The water heater has a high-temperature shutoff switch built in as a standard safety feature (called a 
Hi-Limit switch) therefore a “pressure only” relief valve is required
•	This water heater does not come with an approved pressure relief valve
•	An approved...

24  Page
Installation
Installation Manual
WARNING
Discharge condensate (acidic water) in accordance with all local codes 
and common safety practices.
Condensate 
drain port
1/2" Condensate 
drain tube
Adequate space
Drain
1/2" FPT x 3/8" MPT
(Included with
 Neutralizer accessory)
Neutralizer cartridge
(Included with
 Neutralizer accessory)
3/8" MPT x 1/2" HB
(Included with
 Neutralizer accessory)
Drain
3/8" or 1/2" 
Condensate 
drain tube
Condensate 
drain port
1/2" FPT x...

25  Page
Installation
Installation Manual
•	Follow the electrical code requirements of the local authority having jurisdiction 
In the absence of such requirements, follow the current edition of the National 
Electrical Code ANSI/NFPA 70 in the US or the current edition of CSA C221 
Canadian Electrical Code Part 1 in Canada
•	When servicing or replacing parts within the water heater, label all wires prior 
to disconnection to facilitate an easy and error-free reconnection  Wiring...

26  Page
Installation
Installation Manual
Fig. BBack plate
3-1/4 inchesAttach the screws
Cut out the partition with pliers
Main body
Fig. A
Main body
Twist
Press and twist flat head 
screwdriver against the cutout
Only the outdoor model comes with the temperature remote controller 
Check that these items below are included with the remote controller
Temperature
Remote Controller*ScrewsManualRemote Controller Cable
Qty: 1Qty: 1Qty: 2Qty: 1
TEMPERATURE REMOTE CONTROLLER
-INSTALLATION-

1.	 Take	off...

27  Page
Installation
Installation Manual
Remote controller
      terminals
Fig. C-1
Two fork terminals
Remote controller cable
Inlet for the remote
  controller cable 
Cut out
Fig. C-2
3.	 Tighten	the	two	"Fork terminals" beneath the two "Remote controller terminal" screws,
   which are not polarity-sensitive, on the back of the main body  (Fig. C-1)
4.   Cut out the inlet for the remote controller cable from the bottom of the main body  (Fig. C-2)
5.	 Place	the	“Main body” back...

28  Page
Installation
Installation Manual
HIGH-ALTITUDE INSTALLATIONS
Check the elevation where your water heater is installed  Set DIPswitches shown in the tables below 
depending on the altitude
NOTE: The dark squares indicate the direction the DIPswitches should be set to        Only adjust the necessary switches
Bank of DIPswitches
Computer board
Indoor model
Altitude 0 to 2,000 ft. 
(DEFAULT)
 2,000 to 
 3,000 ft.
3,000 to
5,000 ft.
5,000 to
7,500 ft.
7,500 to
10,100 ft.
DIPswitches...

29  Page
Installation
Installation Manual
•	This water heater is suitable for combination water (potable) heating and 
space heating and not suitable for space heating applications only.
•	In order to purge air in water pipes within a closed-loop system, an air vent 
and air separator should be installed in the system.  Required circulation 
flow rates are labeled next to each application diagram.  These flow rate 
requirements must be followed
•	Toxic chemicals used in boiler treatments such as...

30  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 Z21103
•	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...