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Table of Contents
Related Manuals for A.O. Smith GCV300
Summary of Contents for A.O. Smith GCV300
- Page 1 Service Handbook Residential FVIR Gas Water Heaters MODELS: GCV, GCVH, GVR, GCVL, GVRL, GCVT - SERIES 300/301 XCV, XVR, XCVL, XGV, XVRL, XCVT - SERIES 300/301 LOW LEAD CONTENT THIS SERVICE HANDBOOK IS FOR USE BY QUALIFIED SERVICE PROFESSIONALS ONLY. 327726-001 May 2014...
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Page 2: Table Of Contents
TABLE OF CONTENTS General Safety ..............................4 Completed Installation (typical) ......................... 6 System Basics ..............................7 Honeywell® Gas Control Valve/Thermostat ..........................7 Gas Pressures ................................7 Temperature Settings ..............................7 Combustion Chamber with TCO Switch ..........................8 Lighting the Pilot / Diagnostic Flash Codes ......................9 Lighting the Pilot: ................................... - Page 3 Tank Leak ....................................15 Condensation ................................15 Leaking Plumbing Connections ..........................15 Drips from the T&P Relief Valve Discharge Pipe ..................... 15 Temperature Too High ................................16 Low Water Pressure ................................16 Water Odor ................................... 16 Service Procedures ............................17 Removing the Manifold/Burner Assembly ..........................
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Page 4: General Safety
GENERAL SAFETY Your safety and the safety of others is extremely important in the servicing of this water heater. Many safety-related messages and instructions have been provided in this handbook and on your water heater to warn you and others of a potential hazard. Read and obey all safety messages and instructions throughout this handbook as well as those found in the Installation Instructions/ Use &... - Page 5 Fire or Explosion Harzard Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. Avoid all ignition sources if you smell Natural or LP gas. Do not expose water heater control to excessive gas pressure.
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Page 6: Completed Installation Typical
COMPLETED INSTALLATION TYPICAL Water Supply- Cold* Water Exhaust Vent to Shut-Off Ouside of Building See Labels and Valve Installation Instructions *Massachusett: Install and Use & Care Guide a vacuum relief in cold Union for clearances. water line per section 19 MGL 142. Union Expansion Tank Pressurized to Equal... -
Page 7: System Basics
SYSTEM BASICS Honeywell® Gas Control error codes, see “Lighting the Pilot / The gas control valve\thermostat also Diagnostic Flash Codes” on page 9. includes a temperature limiting ECO Valve/Thermostat (Energy Cut Off) system. This system will shut off the water heater if the Water heaters covered by this handbook water temperature becomes excessive. -
Page 8: Combustion Chamber With Tco Switch
• The water heater and/or pipes is located in the center of the switch, Scalding Risk are located in an area with high directly between the terminals. water heater ambient temperatures (e.g., an make water IMPORTANT: If the thermal switch has attic). -
Page 9: Lighting The Pilot / Diagnostic Flash Codes
LIGHTING THE PILOT / DIAGNOSTIC FLASH CODES Ligh ng the Pilot: door. The control knob must be set may be needed to completely fill the to Pilot and held in continuously line with gas and successfully light 1. Read follow lighting while clicking the igniter button the pilot. -
Page 10: Diagnostic Flash Codes
7. Wait 10 minutes and try to light the Igniter System” 19); 4 Flashes Pilot according to the instructions “Gas Pressure Checks” (p. 11). Indication/Condition: on the water heater’s label. Also, check the thermopile wiring Temperature exceeded (ECO activated). connections (Figure 16, p. 17). 8. -
Page 11: System Checks
SYSTEM CHECKS Connec ons Check • Supply gas pressure checks are measured before the gas control Some issues can be caused by faulty valve/thermostat and as close Explosion Risk connections. Refer to the following list to the water heater as possible. of connections when troubleshooting WARNING! Before performing any NOTE: The dynamic gas pressure... -
Page 12: Thermopile Check (Open Circuit)
2. Insert multimeter leads into the Thermopile Check Table 3. connectors. The multimeter must (Closed Circuit) be set to read millivolts DC (on a Gas Pressures scale that can read 750 millivolts). Follow the lighting instructions to light Reference Figure 12. the pilot. -
Page 13: Common Issues
COMMON ISSUES 8 Flashes replaced). The most likely cause Fire and Explosion Hazard is contamination in the pilot Power Off Failure WARNING! tube. Often, this error can be cleared attempt to light the water by turning the pilot off, letting A. -
Page 14: Faulty Shower Control Valve/Faucet Valve
and early spring months. Even when to adjust the thermostat. If there Reversed Water Connec ons the water heater is working properly, still isn’t enough hot water, set the If the hot and cold water connections it may take longer to fully heat the thermostat to a higher setting and are reversed, it may appear as if the water. -
Page 15: Tank Leak
Tank Leak condensation regularly. In that case, a • Water pressure too high. High water larger water heater is recommended. pressure can cause the T&P relief valve to drip. Install a pressure Condensa on NOTE: Condensation may cause a “2 reducing valve (PRV) on the main Flashes”... -
Page 16: Temperature Too High
Temperature Too High Low Water Pressure Water Odor Check both the cold and hot water at a Harmless bacteria normally present Scalding Risk sink to determine if the lower pressure in tap water can multiply in water A water heater can is only on the hot water side. -
Page 17: Service Procedures
SERVICE PROCEDURES Removing the Manifold/ 8. Remove the screws (1/4” nut Replacing Pilot/ driver) securing the manifold/ Burner Assembly Thermopile Assembly burner assembly to the combustion chamber. (Figure 16.) 1. Turn the gas control/temperature A. Removing the Old Pilot/ knob to the “OFF” position (Figure 9. -
Page 18: External Inspection And Cleaning Of The Base-Ring Filter
B. Installing the New Pilot/ 4. Reinstall the manifold component 2. Follow the Lighting Instructions to block in the manifold door. Ensure turn off the water heater and allow Thermopile Assembly that the pilot tube and wires are it to cool for 10 minutes before 1. -
Page 19: Replacing The Manifold/Burner Assembly
3. Reassemble following 4. Inspect the door gasket and make 9. Turn on the gas supply to the water procedure under “Replacing the sure there is no fiberglass insulation heater at the manual gas shut-off Manifold/Burner Assembly.” between gasket valve. (Figure 1, page 6). combustion chamber. -
Page 20: Removing And Replacing The Gas Control Valve/Thermostat
part on the pilot or pilot assembly. Figure 1, page 6. Disconnect the “Lighting Instructions” on the If no spark is visible, check the the remaining pipe from the gas front of the water heater. wire connections and make sure control valve/thermostat. -
Page 21: Supplements
SUPPLEMENTS EVALUATING Household Appliances: ventilation, contact your local gas utility company or code officials for a safety COMBUSTION AND Gas Burning Appliance BTU/HR Rating inspection. VENTILATION AIR Gas Water Heater The following instructions will help SUPPLY determine if it may be possible to install without outside ventilation. - Page 22 room to get a better estimate of the air must be within 12 inches from the floor B4: Calculate minimum size of available. and the second opening must be within vent openings and ducts 12 inches from the ceiling. Although a Room Volume –...
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Page 23: Attic Installations
Combus on Air Supply Op ons ATTIC INSTALLATIONS Table 5. Minimum Free Area of Permanent WARNING! Openings Ven la on • In all cases, a water heater must be Combus on Air Supply – All Air from installed according to its installation manual. -
Page 24: Elevated Air Temperature
Elevated Air Temperature: Volume Requirement Formula: hrs of total input for all gas-fired appliances in the attic. Also, the In some areas, attics can reach in excess (Inputs in Btu/hr ÷ 1,000) 50 = size of the opening must not be less of 160°F. -
Page 25: Decompression
• The venting system must be installed For example, an attic may be cooled by • Sensors mounted in the metal drain according to the water heater’s an attic fan, designed to pull hot air out pan that trigger an alarm or turn installation instructions and local of the attic and move it to the outdoors. -
Page 26: Field Installation Of Draft Hoods
FIELD air openings). See “Pilot Outage: store or place objects on top of the Insufficient Makeup Air” and “Pilot water heater. INSTALLATION OF Outage: Decompression” for more • Install the draft hood securely to the DRAFT HOODS information (pp. & water heater and flue pipe according respectively). -
Page 27: Types Of Vent Pipe Covered In This Section
Types of Vent Pipe Covered in the legs into the slots, then If you are connecting the draft secure them with screws as hood to Type B vent pipe or to this Sec on described in your installation vent pipe of a different size or •... -
Page 28: Type B Draft Hood Connectors
• When transition to a larger vent Type B Dra Hood Connectors size is required, the vent transition Double wall (Type B) vent pipe will not connection must be made at the fit draft hoods properly. To ensure a draft hood outlet. Do not connect secure connection, use a Type B draft a 4-inch draft hood to 3-inch vent hood connector between double wall... - Page 29 NOTES Residential Standard Gas Water Heater Service Handbook • 29...
- Page 30 NOTES 30 • Residential Standard Gas Water Heater Service Handbook...
- Page 31 NOTES Residential Standard Gas Water Heater Service Handbook • 31...
- Page 32 COPYRIGHT © 2014 A.O. SMITH CORPORATION. ALL RIGHTS RESERVED. ALL TECHNICAL AND WARRANTY QUESTIONS SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS PURCHASED. IF YOU ARE UNSUCCESSFUL, CONTACT A.O. SMITH WATER HEATERS RESIDENTIAL TECHNICAL ASSISTANCE AT 1-800-527-1953 OR WWW.HOTWATER.COM.
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