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Water Heater
GVR300
A.O. Smith GVR300 User Manual
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THIS SERVICE HANDBOOK IS FOR USE B
Y QU
ALIFIED SERVICE PROFE
SSIONALS ONL
Y
.
LOW LEAD
CONTENT
Ser
vice Handbook
R
esiden
tial FVIR
Gas W
a
t
er Hea
ter
s
MODELS:
GCV
, GCVH, GVR, GCVL
, GVRL
, GCVT - SERIES 300/301
X
CV
, XVR, XCVL, X
GV
, XVRL
, X
CVT - SERIES 300/301
327726-001
May 2014
2
Table of Contents
Default Chapter
2
Table of Contents
2
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
9
If the Status Light Does Not Blink
9
If the Pilot Does Not Light
9
If the Pilot Lights but the Status Light Does Not Blink
9
Diagnostic Flash Codes
10
Flashes (LED Not Lit)
10
Status Light on (Solid)
10
1 Flash
10
2 Flashes
10
System Checks
11
Draft Test
11
Connections Check
11
Gas Pressure Checks
11
Thermopile Check (Open Circuit)
12
Thermopile Check (Closed Circuit)
12
Common Issues
13
No Hot Water
13
Not Enough Hot Water
13
Lower Seasonal Water Temperatures
13
Faulty Shower Control Valve/Faucet Valve
14
Thermostat Set too Low
14
An Increase in Hot Water Usage
14
Undersized Water Heater
14
Reversed Water Connections
14
Leak in the Plumbing System
14
Sediment Buildup in the Tank
14
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
17
Removing the Burner from the Manifold/Burner Assembly
17
Replacing the Pilot/Thermopile Assembly
17
External Inspection and Cleaning of the Base-Ring Filter
18
Cleaning the Combustion Chamber and Flame Arrestor
18
Replacing the Manifold/Burner Assembly
19
Testing the Igniter System
19
Removing and Replacing the Gas Control Valve/Thermostat
20
Removing the Gas Control Valve/Thermostat
20
Replacing the Gas Control Valve/Thermostat
20
Draining and Flushing
20
Supplements
21
Evaluating Combustion and Ventilation Air Supply
21
Attic Installations
23
Overview
23
Pilot Outage
23
Elevated Air Temperature
24
Insufficient Makeup Air
24
Blocked Air Screen or Flame Arrestor
24
Improper Venting of the Water Heater
24
Decompression
25
Wind
25
Water Damage
25
Elevated Water Temperature
25
Field Installation of Draft Hoods
26
Tools and Materials
26
Types of Draft Hoods Covered in this Section
26
Types of Vent Pipe Covered in this Section
27
Installation Procedure
27
Coupling
27
Type B Draft Hood Connectors
28
Residential Standard Gas Water Heater Service Handbook
28
4
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A.O. Smith GVR300 Specifications
General
Model
GVR300
Capacity
30 gallons
Power Source
Natural Gas
Warranty
6 years
Diameter
20 inches
Type
Gas
Dimensions
49 x 20 inches
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