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

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2  Page
Installation Manual
Contents
CONTENTS
Installation Manual
SPECIFICATIONS                                    \
                            4
INTRODUCTION                 ...

3  Page
Installation Manual
Installation Manual
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 model number and the 
serial number of your unit written...

4  Page
Installation ManualSpecifications
SPECIFICATIONS
*40 psi (027 MPa) or above is recommended for maximum flow
** The Manif old Pressure is the factory setting and should not need adjustment
NOTE:
•	
Check the rating plate to ensure this product matches your specifications
•	The manufacturer reserves the right to discontinue, or change at any time, specifications or designs 
without notice and without incurring obligation.
Model
140
 Indoor
(T-H3M-DV)
140 
Outdoor
(T-H3M-OS)
Natural...

5  Page
Introduction
Installation Manual
INTRODUCTION
•	This manual provides information necessary for the installation, operation, and maintenance 
of the water heater
•	The model description is listed on the rating plate which is attached to the side panel of the 
water heater
•	Please read all installation instructions completely before installing this product
•	If you have any problems or questions regarding this equipment, consult the manufacturer or 
its local representative
•	This...

6  Page
SAFETY GUIDELINES
SAFETY DEFINITION
Indicates an imminently hazardous situation which, if not avoided, will result in 
death or serious injury
DANGER
WARNING
Indicates an imminently hazardous situation which, if not avoided, could result 
in death or serious injury 
CAUTION
Indicates an imminently hazardous situation which, if not avoided, could result 
in minor or moderate injury 
GENERAL
1. Follow all local codes, or in the absence of local codes, follow the current edition of the...

7  Page
Installation Manual
INSTALLATION
GENERAL
1. Follow all local codes, or in the absence of local codes, follow the current edition of the National 
Fuel Gas Code: ANSI Z2231/NFPA 54 in the USA or B1491 Natural Gas, Propane Installation Code in 
Canada
2. All gas water heaters require careful and correct installation to ensure safe and efficient operation  
This manual must be followed exactly  Read the “Safety Guidelines” section
3. The manifold gas pressure is preset at the...

8  Page
Installation
Installation Manual
•	Installation and service must be performed by a qualified installer (for example, a 
licensed plumber or gas fitter), otherwise the warranty will be void.
•	The installer (licensed professional) is responsible for the correct installation of 
the water heater and for compliance with all national, state/provincial, and local 
codes.
•	The manufacturer does not recommend installing the water heater in a pit or 
location where gas and water can accumulate.
•	Do not...

9  Page
Installation
Installation Manual
INCLUDED ACCESSORIES
Check that these items below are included with the water heater
Installation Manual
and Owner’s Guide Temperature Remote Controller kit*
Outdoor model only Bird Screen
Indoor model only
Qty: 1 Qty: 2
Qty: 1
*For more information on optional items, please refer to p32 to 33
CLEARANCES
Maintain all clearances around 
the water heater
Model To pBottom FrontBackSides
140 Indoor 
(T-H3M-DV ) 12 in
(305 mm) 12 in
(305 mm) 4...

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Installation
Installation Manual
VENTING INSTRUCTIONS
For the 140 Indoor (T-H3M-DV) model
-General-
•	Improper venting of this appliance can result in excessive levels of carbon 
monoxide which can result in severe personal injury or death
•	 Improper installation can cause nausea or asphyxiation, severe injury or death 
from carbon monoxide and flue gases poisoning  Improper installation will 
void product warranty 
DANGER
When installing the vent system, all applicable national and...