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

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Installation
Installation Manual
-Exhaust vent (ABS, PVC, CPVC, or polypropylene vent)-
The Indoor model can be vented with ABS, PVC, CPVC, or polypropylene (temperature rated up to at 
least 149 °F)  Vent material certified to ULC S636 standards is recommended in the USA  In Canada, 
plastic venting must be certified to ULC S636 standards
ItemMaterialUnited States Canada
Exhaust pipe and Fittings Schedule 40 PVC
ANSI/ASTM D1785
   ULC S636 Certified
      Materials Only
PVC-DWV
ANSI/ASTM D2665
Schedule 40 CPVC ANSI/ASTM F441
Schedule 40 ABS-DWV ANSI/ASTM D2661
Polypropylene UL-1738
Pipe Cement/Primer PVC
ANSI/ASTM D2564
CPVC ANSI/ASTM F493
ABS ANSI/ASTM D2235
Use of cellular core PVC (ASTM F891), cellular core CPVC, or Radel®
(polyphenylsulfone) in non-metallic venting systems is prohibited
Covering non-metallic vent pipe and fittings with thermal insulation is prohibited
•	The maximum length of exhaust vent piping must not exceed 70 ft (213 m) for 3” venting, which 
depends on the elevation where the water heater is installed, and 100 ft (305 m) for 4” venting 
(deducting 5 ft (15 m) for each elbow used in the venting system)  Do not use more than 5 
elbows  See the table below 
•	When the horizontal vent run exceeds 5 ft (15 m), support the vent run at 3 ft (09 m) intervals 
with overhead hangers
*For each elbow added, deduct 5 ft. (1.5 m) from max. vent length.
For details on the vent connection, refer to p 13 to 16
No. of 
Elbow
2" venting3" venting4" venting
0 to 3,000 ft0 to 3,000 ft3,001 to 6,000 ft6,001 to 10,100 ft 0 to 10,100 ft
065 ft (20 m)70 ft (213 m)40 ft (122 m)25 ft (76 m)100 ft (305 m)
115 ft (05 m)65 ft (198 m)35 ft (107 m)20 ft (61 m)95 ft (290 m)
2N/A60 ft (183 m)30 ft (91 m)15 ft (46 m)90 ft (274 m)
3N/A55 ft (168 m)25 ft (76 m)10 ft (30 m)85 ft (259 m)
4N/A50 ft (152 m)20 ft (61 m)N/A80 ft (244 m)
5N/A45 ft (137 m)N/AN/A75 ft (229 m)
Excludes vent terminators, one termination elbow, or rain caps 
Max. Vertical or Horizontal (Total) Vent Lengh
General rules for vent terminations:
•	Avoid locating the water heater vent termination near any air intake devices  These fans can 
pick up the exhaust flue products from the water heater and return them to the building  This 
can create a health hazard
•	Locate the vent termination so that it cannot be blocked by any debris, at any time  Most codes 
require that the termination be at least 12 inches (305 mm) above grade, but the installer may 
determine if it should be higher depending on the job site condition and applicable codes
•	A proper sidewall termination is recommended when the water heater is vented through a 
sidewall
•	Regarding the clearances from the exhaust termination to the air inlet or opening, refer to p 17 
to 19  
						

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Installation
Installation Manual
-DIPswitch settings for Vent length-
Vent lengthTwo-pipe and Single pipe
5 to 50 ft.
(DEFAULT)No 6 : ON
No 7 : OFF
51 to 100 ft.No 6 : OFF
No 7 : OFF
OFF
ON12 34 56 78910
OFF
ON1 2 34 56 78910
Vent lengthTwo-pipe
5 to 20 ft.
(DEFAULT)No 6 : ON
No 7 : OFF
21 to 40 ft.No 6 : OFF
No 7 : OFF
41 to 70 ft.No 6 : ON
No 7 : ON
OFF
ON1 2 34 56 78910
OFF
ON1 2 34 56 78910
OFF
ON1 2 34 56 78910
Set DIPswitches shown in the tables below depending on the vent length  Only adjust switches with a black 
square  Black squares indicate the position of the switch
Vent lengthSingle pipe
5 to 45 ft.
(DEFAULT)No 6 : ON
No 7 : OFF
46 to 70 ft.No 6 : OFF
No 7 : OFF
OFF
ON1 2 34 56 78910
OFF
ON1 2 34 56 78910
Vent length Single pipe
5 to 6.5 ft.No 6 : ON
No 7 : ON
OFF
ON1 2 34 56 78910
2 inch venting
3 inch venting
4 inch venting  
						

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Installation
Installation Manual
-Intake and Exhaust Venting Illustrations-
Typical installations using ABS, PVC, CPVC, or polypropylene vent
2 inch vent installation
For details of the optional items, refer to the Installation manual for each optional item
Single pipe with room-air intake
Termination
Hanger
1.	 Connect	a	3"	 elbow	 directly	 on	the
    intake vent collar of the water heater 
2.	 Connect	a	3"	 x	2"	 reducer	 directly	on
   the exhaust vent collar of the water
   heater 
   Make sure the couplings engage 
   the o-rings installed in the intake 
   and exhaust vent collars
3.	 Connect	 a	2"	 straight	 pipe	to
      the reducer
Vent connections for single pipe
*The water heater came with a metal screen 
that will fit into a 3 inch elbow 
* 3" elbow with bird screen
Intake vent collar(Female)
3"x2" reducer
2" straight pipe
Exhaust vent collar (Female)
Refer to pages 17 and 19 for clearance information  
						

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Installation
Installation Manual
3 inch vent installation
1.	 Connect	a	3"	 elbow	 directly	 on	the
   intake vent collar of the water heater 
2.	 Connect	a	3"	coupling directly on the
    exhaust vent collar of the water heater 
   Make sure the couplings engage 
   the o-rings installed in the intake 
   and exhaust vent collars
3.	 Connect	 a	3"	 straight	 pipe	to
      the coupling
Exhaust vent collar (Female)
3" straight pipe
3" coupling(included)
Intake vent collar(Female)
3" straight pipe
1.	 Connect	 3"	couplings	 directly	on	
   the exhaust and intake vent collar 
   of the water heater 
   Make sure the couplings engage 
   the o-rings installed in the intake 
   and exhaust vent collars
2.	 Connect	 3"	straight	 pipes	to	 the
   couplings
For details of the optional items, refer to the Installation manual for each optional item
Vent connections for two-pipeVent connections for single pipe
3" coupling (included)
3" straight pipe
Exhaust vent collar (Female)
* 3" elbow with bird screen
Intake vent collar(Female)
*The water heater came with a metal screen 
that will fit into a 3 inch elbow 
For details of the optional items, refer to the Installation manual for each optional item
1.	 Connect	3"x4"	increasers 
   directly on the exhaust and intake
   vent collar of the water heater 
   Make sure the couplings engage 
   the o-rings installed in the intake 
   and exhaust vent collars
2.	 Connect	 4"	straight	 pipes	to
      the increasers
4" straight pipe
3"x4" increaser
Exhaust ventcollar(Female)
Intake vent collar(Female)
4" straight pipe
3"x4" increaser
4" straight pipe
3"x4" increaser
Exhaust vent collar (Female)
* 3" elbow with bird screen
Intake vent collar(Female)
1.	 Connect	 a	3"	 elbow	 directly	 on	the
    intake vent collar of the water heater 
2.	 Connect	a	3"x4"	increaser directly on
    the exhaust vent collar of the water
   heater 
   Make sure the couplings engage 
   the o-rings installed in the intake 
   and exhaust vent collars
3.	 Connect	 a	4"	 straight	 pipe	to
      the increaser
Vent connections for two-pipeVent connections for single pipe
*The water heater came with a metal screen 
that will fit into a 3 inch elbow 
4 inch vent installation
3" coupling(included)  
						

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Installation
Installation Manual
Two-pipe, direct-ventSingle pipe with room-air intake
Terminations
WallHanger
Hanger
Roof
Roof flashing
Fire stop
Termination
WallHanger
Roof flashing
Fire stop
Roof
Refer to pages 17 and 19 for clearance information
Examples of installation of 3 inch & 4 inch vent  
						

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Installation
Installation Manual
Vent connections for two-pipe
4" stainless steel vent straight pipe
Exhaust vent collar (Female)Intake vent collar(Female)
4" stainless steel vent straight pipe
Exhaust vent collar (Female)
4" stainless steel vent straight pipe
Intake vent collar(Female)
4" elbow with bird screen
1.	 Connect	a	4"	 stainless	 steel	vent
      straight pipes directly on the
      exhaust vent collar of the
      water heater 
2.	 Connect	a	4"	 elbow	 directly
      on the intake vent collar of the
      water heater 
1.	 Connect	4"	stainless	 steel	vent
      straight pipes directly on the
      exhaust/intake vent collar of the
      water heater 
For details of the optional items, refer to the Installation manual for each Optional item
-Exhaust vent (Stainless steel vent)-
This is a Category IV 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 160 °F   For best results, a vent system 
should be as short and straight as possible
•	The Indoor model is a Category IV appliance and must be vented accordingly with any 4 inch vent 
approved for use with Category III/IV or Special BH type gas vent
•	The manufacturer recommends the NovaVent (Z-Vent) line  However, the following are also UL 
listed manufacturers: ProTech Systems Inc (FasNSeal), Metal-Fab Inc, and Heat-Fab Inc (Saf-T 
Vent)
•	Follow the vent pipe manufacturer’s instructions when installing the vent pipe.
•	The maximum length of exhaust vent piping must not exceed 100 ft (305 m) (deducting 5 ft (15 
m) for each elbow used in the venting system)  Do not use more than 5 elbows
•	When the horizontal vent run exceeds 5 ft (15 m), support the vent run at 3 ft (09 m) intervals 
with overhead hangers
DiameterMax. No. of ElbowsMax. Vertical and Horizontal (Total) Vent Length
4 in (102 mm)5100 ft (305 m )
*For each elbow added, deduct 5 ft. (1.5 m) from max. vent length.
No. of ElbowsMax. Vertical or Horizontal Vent Length
0100 ft (305 m)
195 ft (290 m)
290 ft (274 m)
385 ft (259 m)
480 ft (244 m)
575 ft (229 m)
Excludes vent terminators, termination elbows, or rain caps 
Vent connections for single pipe  
						

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Installation
Installation Manual
-Vent termination clearances-
CanadaUS 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 center line of the 
terminator
***
EClearance to unventilated soffit***
FClearance to outside corner***
GClearance to inside corner***
HClearance to each side of center line extended 
above meter/regulator assembly 3 feet**
IClearance to service regulator vent outlet3 feet**
J
Clearance to non-mechanical air supply inlet to 
building or the combustion air inlet to any other 
application
3 feet1 foot
4 feet from below or 
side opening 1 foot 
from above opening
KClearance to mechanical air supply inlet6 feet3 feet3 feet
LClearance above paved sidewalk or paved driveway  
located on public property7 feet*7 feet
MClearance under veranda, porch deck, or balcony1 foot**
*For clearances not specified in ANSI Z2231 / NFPA 54 (US) or B1491 (Canada), please use clearances in accor-
dance with local installation codes and the requirements of the gas supplier 
INSIDE CORNER DETAIL
V
Gas meter / regulator
V
V
V
V
V
V
V
V
V
X
X
X
Vent terminal
Air supply inlet
Area where is not permittedG
A
E
D
B
L
C
F
B
B
B
BA
J
OPERABLEFIXEDCLOSED
B
H
M
K
OPERABLE
FIXEDCLOSED
I  
						

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Installation
Installation Manual
For multiple sidewall exhaust terminations, 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)Exhaust terminationInsidecorner
 1 ft(305 mm) min
 2 ft(610 mm) min1 ft (305 mm)min
For multiple, direct-vent sidewall terminations that 
combine the intake and exhaust into a single penetration, 
space each direct-vent termination at least 1 ft (305 mm) 
away from each other, no matter the orientation  A direct-
vent 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)
Combinedintake andexhausttermination
Insidecorner
 1 ft (305 mm) min
 2 ft(610 mm)  min1 ft (305 mm)       min
For direct-vent sidewall 
terminations that use two 
separate penetrations for 
the intake and exhaust, 
keep the termination 
clearances shown in the 
diagrams on the right 
Exhaust
Intake
1 ft.
(305 mm)
min. Exhaust
Intake
A
A
Exhaust
Intake
1ft. (305 mm)min. Exhaust
IntakeA

A
A: 0.5 ft. (159mm) 
The clearance of A is recommended on the basis of the structure of the water heater
* 3inch and 4 inch vent installations only   
						

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Installation
Installation Manual

Exhaust and/or direct-vent sidewall terminations should 
be at least 2 ft (610 mm) away from an opposite surface/
wall  Do not place the termination directly in front of an 
opening into a building
Intake airExhaust gas
3  ft (914 mm) min.
BA
2 ft (610 mm) min.
Intake air
BB
A
Exhaust
Gas
A:Exhaust terminations must be at least 1 ft (305 mm) away from any obstructions
B:Intake terminations must be at least 1 ft (305 mm) away from any obstructions
Exhausttermination2 ft (610 mm)  min
Please follow all local and national codes in regards to proper termination 
clearances  In the absence of such codes, the clearances above can be used as 
guidelines  Local codes supersede these guidelinesCAUTION  
						

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Installation
Installation Manual
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 water heater 
•	Until testing of the main gas line supply pressure is completed, ensure the gas line to the water heater 
is disconnected to avoid any damage to the water heater
-Gas connections-
1 Install a manual gas shutoff valve between the water heater and the gas supply line  The gas supply 
line shall be checked for leaks using code approved methods
2 When the gas connections are completed, it is necessary to perform a gas leak test either by applying 
soapy water to all gas fittings and observing for bubbles or by using a gas leak detection device
•	The water heater and its individual shutoff valve must be disconnected from the gas supply 
piping system during any pressure testing of that system at test pressures in excess of 1/2 psi 
(35 kPa)
•	The water heater must be isolated from the gas supply piping system by closing its individual 
manual shutoff valve during any pressure testing of the gas supply piping system at test 
pressures equal to or less than 1/2 psi (35 kPa)
3 Always purge the gas line of any debris and/or water before connecting to the gas inlet
Size the gas pipe appropriately to supply the necessary volume of gas required for 
the water heater using ANSI Z2231/NFPA 54 in the USA or B1491 in Canada or 
local codes  Otherwise, flow capabilities and output temperatures will be limited
NOTICE
Gas typeInlet gas pressure
Natural GasMin 40” W C  (100 kPa) – Max 105” W C (261 kPa)
PropaneMin 80” W C  (199 kPa)  – Max 140” W C (348 kPa)
•	Check that the type of gas matches the rating plate first.
•	Ensure that any and all gas regulators used are operating properly and 
providing gas pressures within the specified range shown below.  Excess gas 
inlet pressure may cause serious accidents.
•	Conversion of this water heater from natural gas to propane or vice versa will 
void all warranty   Contact your local distributor to get the correct unit for your 
gas type  The manufacturer is not liable for any property and/or personal 
damage resulting from gas conversions
CAUTION