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On-Demand Water Heater
Installation Manual and Owner's Guide
ANSI Z21.10.3 and CSA 4.3
Gas Tankless Water Heater
Suitable for potable water heating and space-heating
Please refer to local codes for space-heating compliance.
ENDLESS HOT WATER
•
ON-DEMAND USAGE
•
COMPACT, SPACE SAVING
•
ENERGY CONSERVATION
•
COMPUTERIZED SAFETY
•
NO PILOT LIGHT
•
Satisfies the 2012 SCAQMD Rule
•
1146.2 for Ultra-Low NOx
Emissions
• 140 Indoor (T-H3M-DV)
TM
FEATURING
Model
• 140 Outdoor (T-H3M-OS)
If the information in these
instructions is not followed
exactly, a fire or explosion may
result causing property damage,
WARNING
personal injury or death.
- Do not store or use gasoline or other
flammable vapors and liquids in the vicinity
of this or any other appliance.
- WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch, do not
use any phone in your building.
• Immediately call your gas supplier from
a neighbor's phone. Follow the gas
supplier's instructions.
• If you cannot reach your gas supplier, call
the fire department.
- Installation and service must be performed
by a qualified installer, service agency or the
gas supplier.
If you have any questions, please
call or write to:
500 Tennessee Waltz Parkway
Ashland City, TN 37015
Toll Free: 1-877-737-2840
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Table of Contents
Related Manuals for A.O. Smith T-H3M-DV
Summary of Contents for A.O. Smith T-H3M-DV
- Page 1 On-Demand Water Heater Installation Manual and Owner’s Guide ANSI Z21.10.3 and CSA 4.3 Model • 140 Indoor (T-H3M-DV) • 140 Outdoor (T-H3M-OS) If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, WARNING personal injury or death.
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Page 2: Table Of Contents
Installation Manual Contents CONTENTS Installation Manual SPECIFICATIONS 4 INTRODUCTION 5 SAFETY GUIDELINES 6 INSTALLATION 7... -
Page 3: Installation Manual
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 on the rating plate of the water... -
Page 4: Specifications
Installation Manual Specifications SPECIFICATIONS 140 Model Indoor Outdoor (T-H3M-DV) (T-H3M-OS) Natural Gas Input Min: 15,000 BTU/h (Operating Range) Max: 120,000 Propane Input Min: 15,000 BTU/h (Operating Range) Max: 120,000 Gas Connection 1/2" NPT Water Connection 3/4" NPT Water Pressure* 15 - 150 (01 - 10) (MPa) -
Page 5: Introduction
• These high efficiency models have a built-in secondary heat exchanger that absorbs latent heat from the exhaust gas • The 140 Indoor (T-H3M-DV) model is only to be installed indoors The 140 Outdoor (T-H3M- OS) model is only to be installed outdoors • The principle behind tankless water heaters is simple:... -
Page 6: Safety Guidelines
Installation Manual Safety Guidelines SAFETY GUIDELINES SAFETY DEFINITION Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury DANGER Indicates an imminently hazardous situation which, if not avoided, could result in death or serious injury WARNING Indicates an imminently hazardous situation which, if not avoided, could result in minor or moderate injury... -
Page 7: Installation
Regular maintenance is recommended for these types of environments Sealed combustion is recommended too 9. The 140 Indoor (T-H3M-DV) model is to be installed indoors only The model is equipped with a thermistor and hi-limit switch for the exhaust gas, detecting excess temperatures within the flue and... - Page 8 Installation Manual Installation • 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 WARNING 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 have the vent terminal pointing toward any operating window, door, or opening into a building • Do not install the water heater next to any source of airborne debris, such as a clothes dryer and a vent that can cause debris to be trapped inside the combustion...
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Page 9: Included Accessories
Model Bottom Front Back Sides 140 Indoor 12 in 12 in 4 in* 1 in 3 in (T-H3M-DV) (305 mm) (305 mm) (102 mm) (25 mm) (76 mm) 140 Outdoor 36 in 12 in 24 in 1 in 3 in... -
Page 10: Venting Instructions
Inside Corner 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... - Page 11 Installation Manual Installation 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...
- Page 12 Installation Manual Installation -DIPswitch settings for Vent length- 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 2 inch venting Vent length Single pipe ON 1 2 3 4 5 6 7 8 9 10 5 to 6.5 ft.
- Page 13 Installation Manual Installation -Intake and Exhaust Venting Illustrations- ABS, PVC, CPVC, or polypropylene vent Typical installations using 2 inch vent installation Vent connections for single pipe 2" straight pipe * 3" elbow with bird 3"x2" reducer screen Exhaust vent collar (Female) Intake vent collar (Female) *The water heater came with a metal screen that will fit into a 3 inch elbow 1. Connect a 3" elbow directly on the intake vent collar of the water heater 2. Connect a 3" x 2" reducer directly on...
- Page 14 Installation Manual Installation 3 inch vent installation Vent connections for single pipe Vent connections for two-pipe 3" straight pipe 3" straight pipe 3" straight pipe * 3" elbow with 3" coupling (included) bird screen 3" coupling (included) 3" coupling Exhaust (included) Intake vent vent collar collar Exhaust (Female) (Female) vent collar Intake vent collar (Female) *The water heater came with a metal screen (Female)
- Page 15 Installation Manual Installation Examples of installation of 3 inch & 4 inch vent Two-pipe, direct-vent Single pipe with room-air intake Hanger Hanger Wall Wall Hanger Termination Terminations Roof Roof Roof flashing Roof flashing Fire stop Fire stop Refer to pages 17 and 19 for clearance information Page...
- Page 16 Installation Manual Installation -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...
- Page 17 Installation Manual Installation -Vent termination clearances- INSIDE CORNER DETAIL Vent terminal Air supply inlet Area where is not permitted Gas meter / regulator Canada USA Direct-vent and other Direct- Other than than Direct-vent vent Direct-vent Clearance above grade, veranda, porch, deck, or 1 foot 1 foot 1 foot...
- Page 18 Installation Manual Installation For multiple sidewall exhaust terminations, an exhaust 2 ft termination must be at least 1 ft (305mm) away from (610 mm) min 1 ft (305 mm) another exhaust termination An exhaust termination min 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 1 ft (305 mm) min...
- Page 19 Installation Manual Installation 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 Exhaust termination 2 ft (610 mm) min <For rooftop terminations>...
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Page 20: Gas Supply And Gas Pipe Sizing
Installation Manual Installation GAS SUPPLY AND GAS PIPE SIZING -General- • 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. CAUTION • 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... - Page 21 Installation Manual Installation -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. Unit: Cubic feet per hour Pipe Size Length Diameter 100' 125' 150'...
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Page 22: Water Connections
Installation Manual Installation -Measuring inlet gas pressure- 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 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 1 Shut off the manual gas valve on the gas supply line... -
Page 23: Condensate Drain
Installation Manual Installation -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... - Page 24 Installation Manual Installation -Condensate Drain Connections- Discharge condensate (acidic water) in accordance with all local codes and common safety practices. WARNING The water heater is a high efficiency condensing model that produces condensate (acidic water) 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”...
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Page 25: Electrical Connections
Installation Manual Installation • 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 WARNING 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... -
Page 26: Temperature Remote Controller
Installation Manual Installation TEMPERATURE REMOTE CONTROLLER Only the outdoor model comes with the temperature remote controller Check that these items below are included with the remote controller Temperature Screws Manual Remote Controller Cable Remote Controller* Qty: 1 Qty: 2 Qty: 1 Qty: 1 9009069005/TM-RE42 *It is also an optional accessary as a second remote for the indoor model Refer to p 32 -INSTALLATION-... - Page 27 Installation Manual Installation 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 Fig. C-1 Remote controller...
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Page 28: High-Altitude Installations
Installation Manual Installation HIGH-ALTITUDE INSTALLATIONS Check the elevation where your water heater is installed Set DIPswitches shown in the tables below depending on the altitude Indoor model 0 to 2,000 ft. 2,000 to 3,000 to 5,000 to 7,500 to Altitude (DEFAULT) 3,000 ft. 5,000 ft. 7,500 ft. 10,100 ft. 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10... -
Page 29: Applications
Installation Manual Installation APPLICATIONS -Space-Heating Applications- • 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 WARNING 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... - Page 30 Installation Manual Installation -Dual-purpose hot water heating- (Domestic and Space Heating): Diagrammatic layout of radiant heating and domestic water heater per Mass code All water piping should be insulated in accordance with 780 CMR (Massachusetts energy code) 3-inch gas exhaust vent (Discharge must Cold water supply Automatic tempering device comply with local and...
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Page 31: Initial Operation
Installation Manual Installation INITIAL OPERATION FOR YOUR SAFETY, READ BEFORE OPERATING • Check the GAS and WATER CONNECTIONS for leaks before firing unit for the first time • Open the main gas supply valve to the water heater using only your hand to avoid any spark Never use tools If the knob will not turn by hand, do not try to force it; call a quali- fied service technician Forced repair may result in a fire or explosion due to gas leaks • Be sure to check for the presence of leaking gas toward the bottom of the water heater because some gases are heavier than air and may settle towards the floor... -
Page 32: Optional Items
Installation Manual Installation OPTIONAL ITEMS Indoor Outdoor Model (T-H3M-DV) (T-H3M-OS) ✓ Included with the Temperature Remote Controller water heater ✓ ✓ Pipe Cover ✓ ✓ Neutralizer Kit ✓ 4-inch Exhaust Sidewall Vent Terminator (Hood) and 4-inch Wall Thimble ✓ 3-inch Concentric PVC Termination ✓... - Page 33 Installation Manual Installation 4. 4-inch Exhaust Sidewall Vent Terminator (Hood) and 4-inch Wall Thimble: Discription Part# 9008345005 4" Wall Thimble (4"-7") 9008346005 4" Wall Thimble (5"-10") 9007999005 4" Exhaust Sidewall Vent Terminator (Hood) 4" Exhaust Sidewall Vent Terminator (Hood) 9008004005 4-inch Exhaust Sidewall + 4" Wall Thimble (4"-7") 4-inch Vent Terminator 4"...
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Page 34: Owner's Guide
Owner's Guide Owner's Guide 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 on the rating plate of the water... -
Page 35: Operating Safety
Owner's Guide Operating Safety OPERATING SAFETY FOR YOUR SAFETY READ BEFORE OPERATING WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life A This water heater does not have a pilot It is equipped with an ignition device that automatically lights the burner Do not try to light the burner by hand B BEFORE OPERATING smell all around the water heater area for evidence of leaking gas Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor... - Page 36 Owner's Guide Operating Safety DANGER Vapors from flammable liquids will explode and catch fire causing death or severe burns. Do not use or store flammable products such as gasoline, solvents or adhesives in the same room or area near the water heater Keep flammable products: Vapors: 1 Far away from heater 1 Cannot be seen 2 In approved containers 2 Vapors are heavier than air 3 Tightly closed...
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Page 37: Normal Operation
The controllers indicate the remote controller (9009069005/TM-RE42) and the NOTICE temperature controller attached to a surface of the 140 Indoor (T-H3M-DV) model GENERAL Temperature above 125 °F (52 °C) can cause severe burns or death from scalding... -
Page 38: Temperature Settings
Owner's Guide Normal Operation TEMPERATURE SETTINGS -Using controller- Operation Screen on the controller Turn on the 120 VAC power supply to the water heater Press the "ON/OFF" button on the controller in order to turn the controller on When ON, the STAND BY LED is lit It shows the set temperature on its display as shown in (EX: 120 °F) the picture on the right (EX: 120 °F) -
Page 39: Additional Features
Owner's Guide Normal Operation ADDTIONAL FEATURES -Information mode- You can get some information about the water heater condition by pressing the "INFO" button For more information, follow the procedures below: Operation Screen on the controller Inlet water temperature Inlet water temperature will be displayed on the controller by pressing the "INFO" button (EX: 60 °F) Outlet water temperature... -
Page 40: Flow
• The freeze protection system will activate when the freeze protection thermostat senses air temperature below 365 °F (25 °C) • For the 140 Indoor (T-H3M-DV) model: • In any areas subject to freezing temperatures, the manufacturer highly recommends an indoor... -
Page 41: Maintenance And Service
Owner's Guide Normal Operation MAINTENANCE AND SERVICE Turn off the electrical power supply and close the manual gas shutoff valve and the manual water control valve before servicing WARNING • Clean the cold-water inlet filter (Refer to the Unit Draining and Filter Cleaning Section on this page) • Be sure that all openings for combustion and ventilation air are not blocked • The venting system should be checked annually for any leaks, corrosion, blockages or damage • The burner should be checked annually for dust, lint, grease or dirt... -
Page 42: Descaling The Unit
Owner's Guide Normal Operation DESCALING THE UNIT Hard water is a severe problem for the copper coils inside heat exchangers Heat exchanger failure due to scale buildup from hard water conditions is NOT covered by warranty It is highly suggested that a scale inhibitor be installed before the cold water inlet after this procedure is done 1) TOOLS - Gather the following materials: Water... -
Page 43: Troubleshooting
Owner's Guide Troubleshooting TROUBLESHOOTING GENERAL PROBLEM SOLUTIONS It takes a long time to • The time it takes to deliver hot water from the water heater to your get hot water at the fixtures depends on the length of piping between the two The longer fixtures the distance or the bigger the pipes, the longer it will take to get hot water... - Page 44 Owner's Guide Troubleshooting PROBLEM SOLUTIONS Unit does not ignite • Is the power on the water heater? when water goes • Is the gas on? through the unit • Is the flow rate over 05 GPM (19 L/min)? (p 37) • Is the filter on cold water inlet clean? (p 41) • Check for reverse connection and cross connection (p 22) • If you use the remote controller and/or temperature controller, is...
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Page 45: Error Codes
• Consult with the table on the following pages for the description of each error code Green LED Error code indicator on the temperature controller attached to a surface of the 140 Indoor (T-H3M-DV) model and the remote controller 9009069005 (TM-RE42). Example: If your unit has the “321” error code (which signifies an inlet thermistor failure) • Indicator on the controller : “321” will be displayed on the screen in its entirety Error code • Green LED on the computer board: The green LED on the computer board will be... - Page 46 Owner's Guide Troubleshooting -Fault Analysis of Error Codes- If the error code is displayed on the computer board of the water heater or remote controller and/or temperature controller, please check the following After checking, consult with the manufacturer Green Malfunction Remote Diagnosis description LED One Time Incorrect DIPswitch...
- Page 47 Owner's Guide Troubleshooting Green Malfunction Remote Diagnosis description Two Times Air-fuel ratio rod • Check for connection/breakage of wires (Part #708) failure and/or soot on the AFR rod (Part #108) Six Times Abnormal main gas • Check for connection/breakage of wires (Part #707) solenoid valve and/or burn marks on the computer board (Part #701) • Check for signs of vent corrosion...
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Page 48: Components Diagram
Owner's Guide Components Diagram COMPONENTS DIAGRAM Case assembly Indoor model Outdoor model 050 002 Temperature controller Temperature remote controller Indoor model Page... - Page 49 Owner's Guide Components Diagram Computer board assembly Indoor model Outdoor model Surge box assembly Page...
- Page 50 Owner's Guide Components Diagram Burner assembly Burner assembly 111 709 Manifold assembly 055 062 Page...
- Page 51 Owner's Guide Components Diagram Water Way assembly Outdoor Model Indoor Model 419 465 466 064 450 053 for Indoor model 411 058 451 413 052 453 Page...
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Page 52: Parts List
Owner's Guide Parts List PARTS LIST Part # Item # Description 140 model T-H3M model Case assembly for Indoor model EK450 Case assembly for Outdoor model EK451 Front cover for Indoor EK452 Front cover for Outdoor EK453 Intake air port assembly 320273-350 EK454 Bracket EK455 Junction box 319143-510... - Page 53 Owner's Guide Parts List Part # Item # Description 140 model T-H3M model O-ring P18 NBR (Black) 319143-350 EZP18 O-ring P20 NBR (Black) 319143-057 EK042 Silicon ring for Outdoor model 319143-370 EK442 Exhaust port for Outdoor model 319143-121 EX13J Silicon ring 319143-065 EKN50 Heat exchanger assembly for 140 Indoor and Outdoor 320273-556 EK467 Flow adjustment valve / Flow sensor...
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Page 54: Output Temperature Chart
Owner's Guide Parts List Part # Item # Description 140 model T-H3M model Computer board 320273-369 EK480 Rubber grommet 319143-426 EX148 Surge box 320273-128 EK280 120 VAC wire for Indoor model 319143-427 EK146 120 VAC wire for Outdoor model 319143-546 EK143 120 VAC Power ON-OFF switch 319143-141 EKK4V Remote controller wire for Indoor model... -
Page 55: Limited Warranty
Owner's Guide Warranty LIMITED WARRANTY 1 The manufacturer warrants this product against defects in materials or workmanship as described in this document if installed within the United States or Canada The manufacturer or its authorized Service Representative will, at its sole discretion, repair or replace any failed or defective mechanical or electrical parts, or components thereof, or, if the manufacturer or its authorized Service Representative cannot replace said parts, and repair is not commercially practicable, the manufacturer or its authorized Service Representative will refund the purchase price The manufacturer or its authorized Service Representative may, at its sole discretion,... - Page 56 • Freeze damage that occurs without taking proper preventive measures as described in the installation manual • Condensate damage due to improperly installed or lack of a condensate trap (drain). • Any product not installed in compliance with all applicable local & provincial codes, ordinances, and good trade practices • Any product sold to or installed in areas outside of the fifty states (and the District of Columbia) of the United States of America and Canada • Any product installed in applications that cause the water heater to activate more than 300 times per day (This averages to an activation every 5 minutes in a 24-hour period) • Any failures that are not due to defects in materials or workmanship (mechanical and/or electrical parts). • Damages due to improper installation: • Gas: incorrect gas pipe sizing, incorrect gas meter sizing, incorrect gas type, and/or gas pressures that fall outside the product’s specified range • Water: incorrect water pipe sizing, water pressures that fall outside the product’s specified range, recirculation flow rates that fall outside the product’s specified range (air removal), and/or lack of proper methods of air removal in a closed-loop, circulation system (See installation manual for details)