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

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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
Pipe SizeLength
Diameter10'20'30'40'50'60'70'80'90'100'125'150'200'
1/2"1721189581726560565250444034
3/4"360247199170151137126117110104928371
1"678466374320284257237220207195173157134
1 1/4"1,309957768657583528486452424400355322275
1 1/2"2,0901,4301,150985873791728677635600532482412
2"4,0202,7602,2201,9001,6801,5201,4001,3001,2201,1601,020928794
Unit: Cubic feet per hour
     Water
     heater
120,000 BTU/hDryer
 35,000 BTU/h
Gas meter
Furnace
120,000 BTU/h
      Range
65,000 BTU/h
AB
C
10' Length
1/2" Pipe size
15' Length
1/2" Pipe size
15' Length
1" Pipe size
10' Length
3/4" Pipe size
10' Length
1" Pipe size
10' Length
1/2" Pipe size10' Length
1-1/4" Pipe size
Gas  sizing  example    
    (Natural Gas)
Unit: kBTU per hour
Pipe SizeLength
Diameter10'20'30'40'50'60'70'80'90'100'125'150'200'
1/2"26818414812611210193878277686253
3/4"567393315267237217196185173162146132112
1"1,071732590504448409378346322307275252213
1 1/4"2,2051,4961,2121,039913834771724677630567511440
1 1/2"3,3072,2991,8581,5591,4171,2751,1811,0861,023976866787675
2"6,2214,3313,4652,9922,6462,3942,2052,0471,9211,8111,6061,4961,260
Based on Energy Content of 1,000 BTU/Cubic ft:
Divide each appliance's BTU/h requirement by 1,000 BTU/ft3 to get the appliances ft3/h requirement
Take into account the distance the appliance is from the gas meter, look in the above gas chart to properly size the line
For sections of the gas line supplying gas to more than one appliance (Ex: Point A to Point B), add up the cubic ft per hour 
requirements of the appliances that are being supplied by that section, and size to the farthest appliance
For Example: The section from A to B supplies gas to the furnace, range and dryer   Adding up the BTU/h requirements and 
dividing by 1,000 yields a cubic ft per hour requirement of 220 cubic ft of gas per hour   The farthest appliance is the range, 
which is 50 ft away from the meter  Looking at the above chart, and under the column of 50 ft, Section A to B needs to be 1" 
in order to supply 220 cubic ft  
						

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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 water heater between the main 
water supply line and the water heater 
2. In addition, a manual shutoff valve is also recommended on the hot water outlet of the water heater   
If the water heater is installed within, or subjected to, a closed loop water system, a thermal expansion 
tank or code approved device to handle thermal expansion must be installed  We recommend isolation 
valve sets with hose bibs for serviceability such as flushing  See maintenance and service section
1 Turn off all electric power to the water heater if service is to be performed
2 Turn the manual gas valve located on the outside of the water heater clockwise 
to the off position
1 Shut off the manual gas valve on the gas supply line
2 Remove the screw for the pressure port located on the 
gas inlet of the water heater shown in the diagram on 
the right
3 Connect the manometer to the pressure port
4 Re-open the manual gas valve  Check to see that there 
are no gas leaks  Take a reading  of the gas pressure  
Open some of the fixtures that use the highest flow rate 
to turn on the water heater
5 Check the inlet gas pressure  Take another reading  
When the water heater is on maximum and minimum 
burn, the manometer should read from 40” to 105” 
WC (100 to 261 kPa) for Natural gas, or from 80” to 
140” W C (199 to 348 kPa) for Propane  Verify that the 
pressure drop is acceptable
3.  Before installing the water heater, flush 
the water line to remove all debris, and 
after installation is complete, purge 
the air from the line  Failure to do so 
may cause damage to the heater 
4. There is a wire mesh filter within 
the cold inlet to trap debris from 
entering your heater   This will need 
to be cleaned periodically to maintain 
optimum flow (Refer to p 41)Cold inlet
Hot outlet
Gas inlet
As Close as 
Possible
Pressure relief valve
Pressure port
•	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!
WARNING  
						

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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 pressure relief valve must be installed on the hot water outlet
•	The pressure relief valve must conform to ANSI Z21.22 or CAN 1-4.4 and installation must follow local 
codes
•	The discharge capacity must be at least 120,000 BTU/h for the 140 (T-H3M) models
•	The pressure relief valve needs to be rated for a maximum of 150 psi (1 MPa)
•	The discharge piping for the pressure relief valve must be directed so that the hot water cannot splash 
on anyone or on nearby equipment  Follow local codes
•	Attach the discharge tube to the pressure relief valve and run the end of the tube to within 6 inches  
(152 mm) from the floor  This discharge tube must allow free and complete drainage without any 
restrictions
•	If the pressure relief valve installed on the water heater discharges periodically, this may be due to a 
defective thermal expansion tank, defective pressure relief valve, or it could be signs of internal scale 
build up
•	The pressure relief valve must be manually operated periodically to check for correct operation
•	No valves may be placed between the relief valve and the water heater 
CONDENSATE DRAIN
•	The water heater does not include a built-in condensate neutralizer cartridge for reducing the pH level 
of condensate water  If local codes dictate that condensate must be neutralized prior to drainage, a 
condensate neutralizer must be installed  An accessory Neutralizer assembly is sold separately 
•	In the absence of applicable local codes and regulations, the manufacturer recommends that 
condensate be disposed of into a standard drain  Connect a drain tube from the condensate drain port 
(shown below) located on the bottom of the water heater to a standard drain  
						

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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 3/8"
(or 1/2") HB
Adequate space
 Case A Case B
-Condensate Drain Connections-
The water heater is a high efficiency condensing model that produces condensate (acidic water)  The 
acidic condensate generated in the secondary heat exchanger can be neutralized by the Neutralizer acces-
sory
Case A: If a neutralizer is not required
1 Connect a 1/2” FPT X 3/8” (or 1/2”) HB Adaptor to the condensate drain port at the bottom of the 
water heater 
2 Connect a condensate drain tube to the 1/2” FPT X 3/8” (or 1/2”) HB Adaptor   The manufacturer 
recommends the material of the condensate tube be either EPDM or PVC
3 Leave an adequate amount of space between the end of the drain tube and the actual drain, to 
facilitate proper drainage
Case B: If a neutralizer is required (installing the Neutralizer assembly)
1 Connect the 1/2” FPT X 3/8” MPT Adaptor to the condensate drain port at the bottom of the water 
heater 
2 Connect the Neutralizer to the 3/8” MPT connection of the adaptors  There is a flow direction indicator 
on the neutralizer   Please orient the neutralizer in the proper direction
3 Connect a 1/2” drain tube to the other end of neutralizer 
4 Leave an adequate amount of space between the end of the drain tube and the actual drain, to 
facilitate proper drainage  
						

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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 errors 
can cause improper and dangerous operation  Verify proper operation after 
servicing
•	Failure to observe these warnings could result in personal injury or loss of life
WARNING
•	The condensate drain is at atmospheric pressure (non-pressurized) and 
therefore must be allowed to drain freely with gravity only   Please ensure that 
there are no blockages along the condensate drain tube  All portions of the 
condensate drain (neutralizer and drain tube) must be at a lower elevation 
than the water heater to prevent condensate water from building up inside 
the heat exchanger.
•	Condensate cannot be effectively neutralized if the neutralizer elements inside 
the Neutralizer accessory have been completely consumed  If this happens, 
condensate will remain acidic and can possibly cause damage to items such as 
pipes, concrete, etc, if drained improperly
•	The Neutralizer cartridge is designed to last for 3 years before replacement  
However, the actual life of the neutralizer may vary, depending on the 
application and usage  Please ensure that the cartridge is properly replaced 
before the neutralizer elements have been completely consumed
•	All preventative measures and safety practices must be adhered to when 
draining condensate  The manufacturer will not be responsible for any damage 
caused by condensate
•	A drain pan, or other means of protection against water damage, is required to 
be installed under the water heater in case of leaks
WARNING
Outdoor model
Bottom	view	of	water	heaterView of electrical 
connections	of	water	heater
Indoor modelConnect
Power supply
120VAC, 60Hz
Ground
Green screw
ELECTRICAL CONNECTIONS
All Indoor models come with a power plug instead of a junction box.  The following procedure is for 
the outdoor model only.
1. The water heater must be electrically grounded  Do not attach the ground wire to either the gas or 
the water piping
2. The water heater requires 120 VAC, 60 Hz electrical power supply that is properly grounded
•	A proper disconnect (ie on/off switch, power plug, etc) controlling the main power to the water 
heater must be provided for service reasons (Must comply with local codes)
•	Connect the power supply to the water heater exactly as shown in the wiring diagram
3. A green screw is provided in the junction box to ground the connection
4. Can be hardwired or wired to a plug-in
5. The use of a surge protector is recommended in order to protect the water heater from power surges  
						

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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	the	 “Back plate” from the remote controller with a flat head screwdriver  (Fig. A and B)
2.	 Attach	 the	“Back plate” on the wall with the two provided screws (Fig. B)
•	This remote controller is NOT waterproof 
     Do not install in high temperature environments, steamy conditions (such as a
     bathroom), outdoors, in direct sunlight, or within the reach of children
     Make sure the remote controller does not come into contact with water or oil
•	Do not place the remote control wiring close to other wires from other 
products
•	Do not extend the remote control wiring more than 400 ft (122 m)
CAUTION
9009069005/TM-RE42
*It is also an optional accessary as a second remote for the indoor model  Refer to p 32  
						

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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 on the "Back plate", with the "Remote controller cable" running 
      out of the bottom inlet

1.	 Disconnect	 power	supply	from	 the	water	 heater.
2.	 Take	off	 the	 water	 heater’s	 front	cover.
3.	 Locate	 the	remote	 controller	 terminals,	 pictured	below	(located	 around	the	lower
      right-hand side of the computer board)
4.	 Take 	off	 the	 back	 plate	 from	the	remote	 controller,	 and	then	 attach	 the	two	 fork	 terminals	 to
      connector base on the backside of the remote controller with two screws  Make sure the 
      terminals are firmly fixed
5.	 Pull	the	 remote’s	 wires	through	 the	hole	 at	the	 bottom	 of	the	 water	 heater’s	 casing.
6.	 Properly	 attach	the	remote’s	 wires	to	the	 remote	 controller	 terminal	on	the	 computer	 board	
      (No polarity)
	 * Do NOT jump or short-circuit the wires, or the computer will be damaged.
7.	 Replace	Front	Cover	 securely.
8.	 Wires	 used	for	the	 remote	 controller	 connection	 must	be:
•	Minimum 20 gauge wire (No polarity)
•	Maximum 400 ft (122 m) long
9009069005 (TM-RE42)
Connect other end to these terminals   
						

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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
No 3 : OFF
No 4 : OFF
No 5 : OFF
No 3 : OFF
No 4 : ON
No 5 : OFF
No 3 : OFF
No 4 : OFF
No 5 : ON
No 3 : OFF
No 4 : ON
No 5 : ON
No 3 : ON
No 4 : ON
No 5 : ON
OFF
ON123 456 78910
OFF
ON1 23 456 78910
OFF
ON1 2345678910
OFF
ON1 2345678910
OFF
ON1 2345678910
Outdoor model
Altitude 0 to 2,000 ft. 
(DEFAULT)
2,000 to
4,000 ft.
4,000 to
6,000 ft.
DIPswitches
No 3 : OFF
No 4 : OFF
No 5 : OFF
No 3 : OFF
No 4 : OFF
No 5 : ON
No 3 : ON
No 4 : OFF
No 5 : ON
OFF
ON1 23 456 78910
OFF
ON1 2345678910
OFF
ON1 23 456 78910
Installation altitude
 The maximum certified
or allowable installed
altitude is 10,100 ft for
indoor model and 6,000 ft
for outdoor model  
						

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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 alcohol, glycerol and glycol 
groups must not be introduced into the system if the system incorporates an 
open-loop potable water system
•	The water heater can be used to supply potable water and space heating and 
shall not be connected to any heating system or component(s) previously 
used with non-potable water where any chemicals were added to the water 
heating appliances
•	When the system requires water for space heating at temperatures higher 
than required for other uses, a means such as a mixing valve shall be installed 
to temper the water for those other uses in order to reduce scald hazard 
potential
•	Water temperature over 125 °F (52 °C) can cause severe burns instantly or 
death from scalding
WARNING
S
Air vent
Hot	water	outlet	to	fixtures
RecirculationpumpAirseparator
Check valve
Check valve
Y-Strainer
Cold water inlet
Expansion tank
Gas supply
Ball valves
Unions
Hot water outletCold water inletGas inlet
APPLICATIONS
-Space-Heating Applications-
-Recirculation-
*The recirculation pump is to be controlled by:
-Dual-set aquastat (recommended w/timer)
*The recirculation pump is to provide no less than 2 GPM (7.5 L/min) and no more than 4 GPM (15 L/min) through
  each activated unit in the system.
This is a concept drawing only  
						

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•	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 the application of controls and equipment presented   
Designers must add all necessary safety and auxiliary equipment to conform 
to code requirements and design practice  For more details, contact the 
manufacturer
NOTICE
120 VAC switch or outlet
Hot water outlet
Unions
T-handle	gas	shutoff	valve
Check valve
Electronically controlled pump	timer.		Activates	every 6 hours for 60 seconds  Wire to product approved pump
Heating Coil(used with air-handler)
Cold water supply
3-inch gas exhaust vent (Discharge must comply with local and state codes)  Cannot be common vented with other appliances
An approved temperature and pressure relief	valve.	Tie	to	location	approved	by	local	codes	and	must	meet	BTU	rating	of	water heater model used
Check valve will have 1/8-inch hole drilling in	clapper	optional
Atmosphericvacuum breaker
Shutoff	  valve
Pressure gauge
Apply correct thermal expansion tank-size per	application
Shutoff	valves
Shutoff	valves
Check valves
Cold water inletGas inletWater filterDrain plugThermostatic	mixing	valveHot water supply and return to heating	coil
System installed with reverse acting	aquastat	to	shut	off	fan.	Suggested but not required by 248 CMR
50’-0” maximum distance from water heater to fan coil(Developed length) Not including coil	in	heating	unit
NSF-61 product approved pump
Automatic	tempering	device	must be installed below the top of the water heater as per manufacturer’s recommendations
Piping loop between water heater and fan coil shall be in compliance with 248 CMR
Tempered water to plumbing	fixtures.		Must	meet temperature requirements of 248 CMR
All water piping should be insulated in accordance with 780 CMR (Massachusetts	energy	code)
-Dual-purpose hot water heating-
(Domestic and Space Heating):
Diagrammatic layout of radiant heating and domestic water heater per Mass code
     The recirculation pump is to provide no less than 2 GPM (7.5 L/min) and no more than 4 GPM (15 L/min)  
         through each activated unit in the system.
Installation
Installation Manual
BallValveIsolationValve