A.O. Smith 910 Installation Manual And Owner's Manual
  1. Manuals
  2. Brands
  3. A.O. Smith Manuals
  4. Water Heater
  5. 910
  6. Installation manual and owner's manual

A.O. Smith 910 Installation Manual And Owner's Manual

On-demand gas tankless water heater
Hide thumbs Also See for 910:
Table of Contents

Advertisement

Quick Links

On-Demand Water Heater
Installation Manual and Owner's Guide
ANSI Z21.10.3 ・ CSA 4.3
Models
910/910 ASME
Gas Tankless Water Heater
Suitable for combination potable water heating
and space-heating
Please refer to local codes
for space-heating compliance.
FEATURING
R
D
R
TM
H L W
WARNING
For supplying potable
hot water
ASME model ONLY

Advertisement

Table of Contents
loading

Related Manuals for A.O. Smith 910

Summary of Contents for A.O. Smith 910

  • Page 1 For supplying potable hot water ASME model ONLY H L W ANSI Z21.10.3 ・ CSA 4.3 Models 910/910 ASME WARNING Gas Tankless Water Heater Suitable for combination potable water heating and space-heating Please refer to local codes for space-heating compliance.

  • Page 2: Table Of Contents

    Contents CONTENTS SPECIFICATION Natural Gas Input Min: 15,000 BTU/h Installation Manual BTU/H (Operating Range) Max: 380,000 BTU/h SPECIFICATIONS ..............2 Propane Input Min: 15,000 BTU/h INTRODUCTION ..............4 BTU/H SAFETY GUIDELINES..............6 (Operating Range) Max: 380,000 BTU/h SAFETY DEFINITION ............6 Gas Connection 1” NPT GENERAL ................6 INSTALLATION .................7 Water Connections...

  • Page 3: Installation Manual

    Installation Manual CONGRATULATIONS Congratulations and thank you for choosing our tankless water heater. Before use, we recommend that you read through this installation If you need an additional manual, contact the manufacturer or your local distributor. When you call, please tell us the product name and the serial number of your unit written on the rating plate of the water heater.

  • Page 4: Introduction

    This appliance is an on-demand, tankless water heater. It is designed to efficiently supply endless hot water for your needs. The 910 has two heat exchangers. The primary and secondary heat exchangers alternate roles, extend- ing the life of the 910. (See p. 5.)
  • Page 5 The 910 has two combustion sections. The combustion section that turns on first is the primary section. The secondary section will activate when the flow rate through the primary section meets the flow listed in the table below. Flow rate at which the Set temperature °F (°C )

  • Page 6: Safety Guidelines

    SAFETY GUIDELINES 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

    INSTALLATION 1. Follow all local codes, or in the absence of local codes, follow the current edition of the National Fuel Gas Code: ANSI Z223.1/NFPA 54 in the USA or B149.1 Natural Gas and Propane Installation Code in Canada. 2. All gas water heaters require careful and correct installation to ensure safe and efficient operation.
  • Page 8 The 910 model weighs 102 lbs. (46.3 kg). Ensure that any and all support structures (whether it is installed on a wall, on a support stand, etc.) have enough strength to support and hold the water heater. When handling the 910, do not place your hands inside the flue collar. Injury may result.

  • Page 9: Clearances

    Maintain all clearances around the water heater. Failure to do so could create a fire hazard, potentially leading to death, seri- ous injury, and/or property damage. WARNING Installation Bottom Front Back Sides 12 in. 12 in. 4 in.** 1.0 in. 3 in.
  • Page 10 1. Temperature remote controller 2. Multi-unit controller 100112155 (TM-RE30) 100112691(TM-MC02) The multi-unit controller can control The remote controller has the a maximum of 10 water heaters, following functions: adjusts the output tempera- from 15,000 BTU to 3,800,000 BTU. ture of hot water. It also works as a diagnostic tool that provides informations of the will give an error code whenever...

  • Page 11: Warning For Installations

    FOR YOUR SAFETY, READ BEFORE INSTALLATION: Do not install the heater where water, debris or Do not have the vent terminal pointing toward flammable vapors may get into the flue terminal. any opening into a building. Do not locate your This may cause damage to the heater and void the water heater in a pit or location where gas and warranty.

  • Page 12: Outdoor Installations

    Follow all local codes, or in the absence of local codes, follow the current edition of the National Fuel Gas Code: ANSI Z223.1/NFPA 54 in the USA or B149.1 Natural Gas, Propane Installation Code in Canada. Install outdoors only in areas with mild, temperate climates. Change the DIP switch for outdoor installation.

  • Page 13: Indoor Installations

    Follow all local codes, or in the absence of local codes, follow the current edition of the National Fuel Gas Code: ANSI Z223.1/NFPA 54 in the USA or B149.1 Natural Gas, Propane Installation Code in Canada. Do not change the DIP switch settings for indoor installations. The DIP switch settings were already set at the factory.

  • Page 14: Direct Intake Vent System

    Combustible air supplied by mechanical fan or make up air device The water heater is equipped with a combustible air sensor that will shut off the unit when inadequate com- bustible air supply to unit is detected. If a mechanical fan or make up air device is used to supply air to the water heater or utility room, the installer should make sure it does not create drafts which could cause nuisance shutdowns.

  • Page 15: Venting Instructions

    For indoor installations -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 WARNING warranty.
  • Page 16 downward and for vertical runs, installing a condensate drain is recommended. Please refer to pp. 17 and 18 for the diagrams. A backflow preventor should be installed in the exhaust when the heater is installed in climates subject to freezing temperatures. General rules for vent terminations: Avoid locating the water heater vent termination near any air intake devices.

  • Page 17: Vent Length And No. Of Elbows

    -Vent length and No. of Elbows- This is a Category III 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 350 °F (177 °C).

  • Page 18: Clearances For Sidewall Terminations

    Roof Rain cap Wall Roof Hanger Sidewall vent Vertical condensation drain** Fire stop Back flow preventer* Hanger Vertical condensation drain** *Backflow preventer (Recommended for freezing weather conditions: 36 °F (2 °C) and below). Backflow preventer* **Vertical condensation drain must be installed in accordance with local codes.

  • Page 19: Clearances For Rooftop Terminations

    Improper installation can result in carbon monoxide poisoning or death. Follow all local and national codes in regards to proper termination clearances. In the absence of such codes, the clearances below must be met. Local codes supersede these clearances. WARNING Failure to observe this warning may result in severe personal injury or death.

  • Page 20: Vent Termination Clearances

    Inside corner = Vent terminal detail = Air supply inlet = Area where the terminal Fixed Operable Fixed closed closed Operable Regulator/Gas meter vent outlet Canada Installations US Installations Direct vent and other than Direct Other than direct vent vent directdvent A Clearance above grade, veranda, porch, deck, or balcony 1 ft (30 cm)

  • Page 21: Gas Supply And Gas Pipe Sizing

    -General- Do not use this water heater with any gas other than the one listed on the rating plate. 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.

  • Page 22: Natural Gas Supply Piping

    -Natural gas supply piping- Maximum delivery Capacity in Cubic Feet of Gas per Hour (based on IPS Pipe carrying Natural Gas with 0.60 Specific Gravity with a Pressure Drop of 0.5" W.C.). Based on Energy Content of 1,000 BTU/Cubic ft; The water heater requires 380 Cubic ft/hr. The following tables are from NFPA 54.

  • Page 23: Water Connections

    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! Failure to follow these instructions could lead to WARNING property damage, personal injury, or loss of life.

  • Page 24: Electrical Connections

    Ensure that circuit power is turned OFF before you complete the following steps. 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 U.S. or the current edition of CSA C22.1 Canadian Electrical Code Part 1 in Canada When servicing or replacing parts within the water heater, label all wires prior to dis- WARNING...

  • Page 25: External Fan Motor Connection

    *Max voltage allowed on these terminals: 240VAC The 910 can be used to control a recirculation pump. Proper pump control helps to preserve the life of the system and saves energy as well. The water heater pump control port is a “normally-open” dry contact, and therefore needs additional components to properly control a recirculation pump.

  • Page 26: Two Unit Priority

    DIP SW No. 5 ON The 910 will heat the water 5.4 °F (3 °C) higher than its set temperature unless it is set at 185°F (85°C). This is to ensure a higher rate of recovery for storage tank applications. The circulation pump (from storage tank to 910) will always remain running.

  • Page 27: Easy Link Connection Procedures

    same model Gas In Hot Out Cold In The Easy-Link System is limited to up to 4 units. If you connect more than 4 units, only the first 4 units will work as a part of the Easy-Link System. The other additional NOTICE units will not work.
  • Page 28 Turn off the power supply to the water heater before changing the DIP switch WARNING settings. Failure to observe this warning could result in carbon monoxide poisoning or death. (A) 910 model Computer board and connection connectors This LED will turn on when the heater is properly linked in the Easy-Link system.
  • Page 29 Multiple 910 models can be combined for a Multi-Unit System, along with the multi-unit controller 100112691(TM-MC02). Each multi-unit controller can control from 2 to 10 units for commercial or residential applications. For a 10-unit system, the computer can modulate from 15,000 BTU/h to 3.8 million BTU/h.

  • Page 30: Applications

    APPLICATIONS 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.
  • Page 31 (Domestic and Space Heating): Diagrammatic layout of radiant heating and domestic water heater. All water piping should be insulated in accordance with 780 CMR 5" Gas Exhaust vent (Discharge must comply with local and Cold water supply state codes.) Cannot be common vented must be installed below with other appliances...

  • Page 32: Initial Operation

    INITIAL OPERATION FOR YOUR SAFETY, READ BEFORE OPERATING Check the GAS and WATER CONNECTIONS for leaks before firing the unit for the first time. Open the main gas supply valve to the unit using only your hand to avoid any spark. Never use tools.

  • Page 33: 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 owner's guide If you need an additional manual, contact the manufacturer or your local distributor. When you call, please tell us the product name and the serial number of your unit written on the rating plate of the water heater.

  • Page 34: Operating Safety

    OPERATING SAFETY FOR YOUR SAFETY READ BEFORE OPERATING WARNING: OPERATING INSTRUCTIONS TO TURN OFF GAS TO APPLIANCE Page...
  • Page 35 DANGER DANGER ° ° CHAUDE CHAUDE CHAUDE BURN BRÛLURE ° ° ・ Page...

  • Page 36: Normal Operation

    NORMAL OPERATION Temperatures above 125 °F (52 °C) can cause severe burns or death from scalding. Children, disabled and the elderly are at high risk of being injured. °F °C WARNING more Time to produce 1½ to 2 about about less than less than about...

  • Page 37: Set Temperature

    -Set temperature- 1. Turn on the 120 VAC power supply to the unit. 2. Press the "ON/OFF" button on the controller in order to turn the controller on. When ON, the STAND BY LED is lit. The set temperature of the output water appears on its display. 3.

  • Page 38: Temperature Settings On The Computer Board

    <Information mode> You can get some information about the water heater condition by pressing the "INFO" button. The following information will be displayed seqentially by pressing the "INFO" button. Inlet water temperature Outlet water temperature Water flow Finish L / M G / M L / M G / M L / M G / M...

  • Page 39: Flow

    The flow rate through the water heater is limited to Household Flow Rates a maximum of 14.5 GPM (54.9 L/min). Flow rate The temperature setting, along with the supply Appliance/Use GPM (US) L/min temperature of the water, will determine the flow Lavatory Faucet rate output of the unit.

  • Page 40: Measuring Inlet Gas Pressure

    above the burner Red or Yellow The manufacturer recommends having the unit checked once a year or as necessary by a licensed technician. If repairs are needed, any repairs should be done by a licensed technician. -Measuring inlet gas pressure- 1.

  • Page 41: Troubleshooting

    TROUBLESHOOTING 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.
  • Page 42 PROBLEM SOLUTIONS Unit does not ignite Is the flow rate over 0.5 GPM (1.9 L/min)? (p. 36) when water goes Check the filter on the cold water inlet. (p. 40) through the unit. Check for reverse connection and cross connection. If you use the remote controller, is the power button turned on? Check if the inlet water temperature is too high.

  • Page 43: General

    -General- The units have self-diagnostic functions for safety and convenience when troubleshooting. If there is a problem with the installation or the unit, the error code will be displayed on the 7-Seg LED on the center computer board and remote controller (if it is installed.) Consult the table on the following pages for the description of each error code.

  • Page 44: Fault Analysis Of Error Code

    -Fault Analysis of Error Codes- If the error code is displayed on the computer board of the water heater or the controller, please check the following. After checking, consult with the manufacturer. Error Malfunction Diagnosis description code Incorrect DIP Check the DIP switches settings on the PCB (Part #701). switch setting Warning for the Check the gas type of the water heater matches the gas supplied to it.
  • Page 45 Error Malfunction Diagnosis description code 611* Fan motor fault Check for connection/breakage of wires, dust buildup in the fan motor (Part #416) and/or burn marks on the computer board (Part #701). Check for frozen/corrosion of connectors. Abnormal external Check whether the pump connected to center computer board works pump properly.

  • Page 46: Components Diagram

    COMPONENTS DIAGRAM Case assembly Computer board assembly The 910/910 ASME models share the same components. 704 418 703 707 706 113 113 716 704 418 703 707 706 721 714 Page...
  • Page 47 Burner assembly The 910/910 ASME models share the same components. Page...
  • Page 48 Combustion and Exhaust assembly Other than Part# 444, Part# 445, Part# 446 and Part# 447, the 910/910 ASME models share the same components. T-M50 ASME / 910 ASME Page...
  • Page 49 Water Way assembly 910 model 910 ASME 429 425 model 407 406 411 419 429 425 Page...

  • Page 50: Parts List

    (No. 447), left cold pipe (No. 448), left hot pipe (No. 449), right hot pipe (No. 450) and right cold pipe (No. 451), all of the T-M50 ASME / 910 ASME’s components are the same as the T-M50 / 910.
  • Page 51 Tapping screw SUS3 M4X6 Truss head 100074512 EW009 Heater 117 100074407 Outlet drain plug 100074383 100076305 EZM06 Heat exchanger assembly for 910 ASME 100074454 EM323 Connection pipe for 910 ASME 100074455 EM326 100074532 EZM18 Connecting pipe for 910 ASME 100074462...

  • Page 52: Output Temperature Chart

    Parts # Item # Description 910 models T-M50 models Multi communication wire 100074431 EM279 Left communication wire 100074418 EM261 Right communication wire 100074419 EM262 Remote controller terminal 100074428 EM273 Wire cramp 100074233 EM167 Left PCB fixing plate 100074425 EM269 Right PCB fixing plate...

This manual is also suitable for:

910 asme

Table of Contents