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- A.O. Smith
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- GCV300
- Service Handbook
A.O. Smith GCV300 Service Handbook
Summary of GCV300
Page 1
This service handbook is for use by qualified service professionals only. Low lead content 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 327726-001 may 2014.
Page 2: Asics
2 • residential standard gas water heater service handbook b asics 2 • residential standard gas water heater service handbook b asics 2 • residential standard gas water heater service handbook table of contents general safety .............................................................................
Page 3: Asics
Residential standard gas water heater service handbook • 3 b asics residential standard gas water heater service handbook • 3 b asics residential standard gas water heater service handbook • 3 tank leak ....................................................................................................
Page 4: Asics
4 • residential standard gas water heater service handbook b asics 4 • residential standard gas water heater service handbook b asics 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 b...
Page 5: Asics
Residential standard gas water heater service handbook • 5 b asics residential standard gas water heater service handbook • 5 b asics 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 source...
Page 6: Asics
6 • residential standard gas water heater service handbook b asics 6 • residential standard gas water heater service handbook b asics completed installation ΈtypicalΉ exhaust vent to ouside of building union union water shut-off valve water supply- cold* expansion tank pressurized to equal supply wa...
Page 7: Asics
Residential standard gas water heater service handbook • 7 b asics honeywell® gas control valve/thermostat water heaters covered by this handbook are equipped with honeywell gas control valve/thermostats. • the honeywell valve uses a thermopile instead of a thermocouple as did previous designs. • he...
Page 8: Asics
8 • residential standard gas water heater service handbook b asics scalding risk a water heater can make water hot enough to cause severe burns instantly, resulting in severe injury or death. Higher temperatures increase the risk of scalding, but even at 120°f, hot water can scald. See table 2. Ther...
Page 9: Pil
Residential standard gas water heater service handbook • 9 pil o t/flash c ode s lighting the pilot / diagnostic flash codes lighƟ ng the pilot: 1. Read and follow the lighting instructions on the water heater’s label. 2. Turn the control knob to “pilot.” press the knob in fully and hold it in. (the...
Page 10: Pil
10 • residential standard gas water heater service handbook pil o t/flash c ode s 7. Wait 10 minutes and try to light the pilot according to the instructions on the water heater’s label. 8. While clicking the igniter button continuously, the control knob must be set to pilot and held in until the st...
Page 11: Tem Che
Residential standard gas water heater service handbook • 11 s y s tem che ck s system checks explosion risk warning! Before performing any test, check the area around the water heater for any source of a flammable vapor (i.E gasoline, paint thinners, etc.). If any sources are found, do not proceed u...
Page 12: Tem Che
12 • residential standard gas water service handbook s y s tem che ck s table 3. Gas pressures if . . . . . . Then ...The supply gas pressure is lower than required... • increase the supply gas pressure regulator setting and/or • increase supply gas piping size. ...The supply gas pressure is higher ...
Page 13: Ommon Issue
Residential standard gas water heater service handbook • 13 c ommon issue s fire and explosion hazard warning! Do not attempt to light the water heater if flammable vapors or liquids are present. Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other ...
Page 14: Ommon Issue
14 • residential standard gas water service handbook c ommon issue s and early spring months. Even when the water heater is working properly, it may take longer to fully heat the water. As a result, hot water may not be available as quickly as it is during warmer months. Faulty shower control valve/...
Page 15: Ommon Issue
Residential standard gas water heater service handbook • 15 c ommon issue s tank leak condensaƟ on if you see small puddles of water in the drain pan or hear sizzling sounds as water drips on the burner, the water heater may be producing condensation. Condensation may drip onto the burner or other h...
Page 16: Ommon Issue
16 • residential standard gas water service handbook c ommon issue s temperature too high scalding risk a water heater can make water hot enough to cause severe burns instantly, resulting in severe injury or death. Higher temperatures increase the risk of scalding, but even at 120°f, hot water can s...
Page 17: Ser
Residential standard gas water heater service handbook • 17 ser vice pr ocedure s service procedures removing the manifold/ burner assembly 1. Turn the gas control/temperature knob to the “off” position (figure 6 on page 9). 2. Before performing any maintenance, it is important to turn off the gas s...
Page 18: Ser
18 • residential standard gas water heater service handbook ser vice pr ocedure s b. Installing the new pilot/ thermopile assembly 1. Read this step carefully before proceeding. Using the old pilot/ pilot tube assembly as a guide, bend the new pilot tube to match the old one. Make only the bends clo...
Page 19: Ser
Residential standard gas water heater service handbook • 19 ser vice pr ocedure s 3. Reassemble following the procedure under “replacing the manifold/burner assembly.” replacing the manifold/ burner assembly explosion risk warning! • tighten both manifold door screws securely. • remove any fiberglas...
Page 20: Ser
20 • residential standard gas water heater service handbook ser vice pr ocedure s part on the pilot or pilot assembly. If no spark is visible, check the wire connections and make sure that the electrode is not broken. See also “connections check” (p. 11). B. Replace the igniter if defective (i.E., g...
Page 21: Supplements
Residential standard gas water heater service handbook • 21 supplements evaluating combustion and ventilation air supply warning! Gas water heaters require an adequate source of clean air for combustion and ventilation. Without sufficient air, a water heater will have frequent pilot outages and may ...
Page 22: Supplements
22 • residential standard gas water heater service handbook supplements room to get a better estimate of the air available. Room volume – object volume = air volume a2: calculate required air volume a water heater installed in an unconfined attic or garage requires that the space be at least 50 cubi...
Page 23: Supplements
Residential standard gas water heater service handbook • 23 supplements table 5. Minimum free area of permanent openings for venƟ laƟ on and combusƟ on air supply – all air from outdoors only. Based on the total btu/hr input raƟ ng for all gas burning appliances within a confi ned space. Opening sou...
Page 24: Supplements
24 • residential standard gas water heater service handbook supplements elevated air temperature: in some areas, attics can reach in excess of 160°f. Such high temperatures can cause atmospherically-vented water heaters to stall and shut down. Why? The flame arrestors, filters, and sealed combustion...
Page 25: Supplements
Residential standard gas water heater service handbook • 25 supplements • the venting system must be installed according to the water heater’s installation instructions and local codes. In the absence of local codes, follow the national fuel gas code (ansi z223.1-current edition). • the draft hood m...
Page 26: Supplements
26 • residential standard gas water heater service handbook supplements air openings). See “pilot outage: insufficient makeup air” and “pilot outage: decompression” for more information (pp. 24 & 25, respectively). In the short term, however, open a hot water faucet and allow the water to flow until...
Page 27: Supplements
Residential standard gas water heater service handbook • 27 supplements types of vent pipe covered in this secƟ on • single wall - galvanized steel • double wall (type b) - galvanized steel installaƟ on procedure 1. Determine the size of the draft hood. To determine the size of a draft hood, measure...
Page 28: Supplements
28 • residential standard gas water heater service handbook supplements • when transition to a larger vent size is required, the vent transition connection must be made at the draft hood outlet. Do not connect a 4-inch draft hood to 3-inch vent pipe. A draft hood must only be connected to an equal o...
Page 29: Notes
Residential standard gas water heater service handbook • 29 no te s notes.
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30 • residential standard gas water heater service handbook no te s notes.
Page 31: Notes
Residential standard gas water heater service handbook • 31 no te s notes.
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.Hotw...