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• Do not touch any electrical 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. WHAT TO DO IF YOU SMELL GAS PART NO. 72090 REV. D (07-11) GSW Water Heating is a division of A. O. Smith Enterprises Ltd. This page intentionally left blank. May be used for notes or to record other installation information. – 2– TABLE OF CONTENTS I) INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . 4 User Responsibilities 4 II) SAFETY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 For Installations in Canada 4 For Installations in the United States 4 Safety Warning (Flammable Vapours) 5 Safety Warning (Scalding) 5 Safety Warning (Carbon Monoxide) 5 Relief Valves (T&P) 5 Backflow Prevention 5 III) INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Unpacking the Water Heater 6 Location Requirements 6 In Earthquake Zones Clearances and Accessibility 6 Gas Supply 7 Gas Pressure Gas line purging Gas Leak Testing Air Requirements 9 Confined Space Air Requirements for Canadian Installations 9 Confined Space Air Requirements for U.S. Installations 10 Exhaust Venting 11 Vent Pipe System Drafthood Installation Water Supply 11 Piping Installation Closed System/Thermal Expansion Temperature and Pressure (T&P) Relief Valve 12 The Temperature And Pressure Relief Valve: The Discharge Line: Installations Check 13 IV) OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . 14 Water Temperature Regulation 14 Temperature Adjustment Lighting Instructions (Robertshaw 110R) 15 Lighting Instructions (Robertshaw 220R) 16 Lighting Instructions (White-Rodgers 37C) 17 V) OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Burner Flames 18 Emergency Shut Down 18 Checking the Draft 18 Operating Conditions 18 Condensation Water Heater Sounds Safety Shut-off Anode/Water Odour VI) MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Draining and Flushing 19 Periodic Inspection 19 External Cleaning of the Flame-arrester 20 Resetting and Replacing the Safety (TCO) Switch20 Temperature and Pressure Relief Valve 20 VII) COMBO HEATING . . . . . . . . . . . . . . . . . . . . . . . . 21 System Requirements VIII) TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . 22 IX) REPAIR PARTS ILLUSTRATION. . . . . . . . . . . . . 24 LIMITED WARRANTY. . . . . . . . . . . . . . . . . . . . . . 25 RETAIN THESE INSTRUCTIONS IN A SAFE LOCATION FOR FUTURE REFERENCE Your safety and the safety of others is very important. We have provided many important safety messages in this manual and on your appliance. Always read and obey all safety messages. This is the safety alert symbol. This symbol alerts you to potential hazards that can kill or hurt you and others. All safety messages will follow the safety alert symbol and either the word “DANGER” or “WARNING”. You can be killed or seriously injured if you don’t immediately follow DANGER instructions. WARNING You can be killed or seriously injured if you don’t follow instructions. All safety messages will tell you what the potential hazard is, tell you how to reduce the chance of injury, and tell you what can happen if the instructions are not followed. I) INTRODUCTION II) SAFETY We thank you for choosing a Flammable Vapor Resistant Water Heater. Your satisfaction with this product is very important to us. This gas-fired water heater has been developed to produce domestic hot water and may also be used in combination with space heating applications. The Flame GuardTM safety system is designed to reduce the risk of flammable vapor related fires by trapping the burning vapors within the water heater combustion chamber using the special flame arrester. The burning vapors literally “burn themselves out” without escaping back into the room. User Responsibilities These instructions have been written for the proper installation, safe operation and maintenance of this water heater. It is your responsibility to ensure that your water heater is properly installed and cared for. FAILURE TO FOLLOW THE INSTRUCTIONS IN THIS MANUAL MAY RESULT IN SERIOUS BODILY INJURY AND/OR PROPERTY DAMAGE. THOROUGHLY READ ALL INSTRUCTIONS BEFORE YOU ATTEMPT TO INSTALL, OPERATE OR MAINTAIN THIS HEATER. Installation and service requires trade knowledge in the area of plumbing, electricity, venting, air supply and gas supply. If you lack these skills or do not understand these instructions, enlist the help of a qualified professional. The manufacturer of this water heater cannot be held liable for those damages caused by improper installation, sizing or failure to comply with these instructions. Protect your warranty: Regularly maintain your water heater and venting system as detailed in the “Maintenance” section of this manual. WARNING Service to the Flame GuardTM safety system should only be performed by a qualified serv...
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