AO Smith Water Heater GPVX 50 User Manual

Instruction Manual  
RESIDENTIAL GAS WATER HEATERS  
POWER VENTED GAS MODELS WITH HOT SURFACE IGNITION  
NOT FOR USE IN MANUFACTURED (MOBILE) HOMES  
GAMA certification applies  
to all residential gas water  
heaters with capacities of 20  
to 100 gallons with input rating  
of 75,000 BTU/Hr. or less.  
For Your Safety •  
AN ODORANT IS ADDED TO THE GAS USED  
BY THIS WATER HEATER.  
ALL TECHNICAL AND WARRANTY QUESTIONS: SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS  
PURCHASED. IF YOU ARE UNSUCCESSFUL, PLEASE WRITE TO THE COMPANY LISTED ON THE RATING PLATE ON THE WATER HEATER.  
KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE  
WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.  
PRINTED 1208  
315465-000  
SAFE INSTALLATION, USE AND SERVICE  
Your safety and the safety of others is extremely important in the installation, use and servicing of this water heater.  
Many safety-related messages and instructions have been provided in this manual and on your own water heater to warn you and  
others of a potential injury hazard. Read and obey all safety messages and instructions throughout this manual. It is very important  
that the meaning of each safety message is understood by you and others who install, use or service this water heater.  
All safety messages will generally tell you about the type of hazard, what can happen if you do not follow the safety message and  
how to avoid the risk of injury.  
The California Safe Drinking Water and Toxic Enforcement Act requires the Governor of California to publish a list of substances  
known to the State of California to cause cancer, birth defects, or other reproductive harm, and requires businesses to warn of  
potential exposure to such substances.  
WARNING: This product contains a chemical known to the State of California to cause cancer, birth defects, or other reproductive  
harm. This appliance can cause low-level exposure to some of the substances included in the Act.  
IMPORTANT DEFINITIONS  
Qualied Installer: A qualied installer must have ability equivalent to a licensed tradesman in the elds of plumbing,  
air supply, venting and gas supply, including a thorough understanding of the requirements of the National Fuel Gas  
Code as it relates to the installation of gas red water heaters. The qualied installer must also be familiar with the  
design features and use of ammable vapor ignition resistant water heaters, and have a thorough understanding of this  
instruction manual.  
Service Agency: Aservice agency also must have ability equivalent to a licensed tradesman in the elds of plumbing,  
air supply, venting and gas supply, including a thorough understanding of the requirements of the National Fuel Gas  
Code as it relates to the installation of gas red water heaters. The service agency must also have a thorough  
understanding of this instruction manual, and be able to perform repairs strictly in accordance with the service guidelines  
provided by the manufacturer.  
Gas Supplier: The Natural Gas or Propane Utility or service who supplies gas for utilization by the gas burning  
appliances within this application. The gas supplier typically has responsibility for the inspection and code approval of  
gas piping up to and including the Natural Gas meter or Propane storage tank of a building. Many gas suppliers also  
offer service and inspection of appliances within the building.  
2
GENERAL SAFETY  
3
TABLE OF CONTENTS  
SAFE INSTALLATION, USE AND SERVICE............................2  
FOR YOUR INFORMATION...................................................23  
Start Up Conditions.........................................................23  
Condensate.....................................................................23  
Smoke/Odor....................................................................23  
Thermal Expansion.........................................................23  
Strange Sounds..............................................................23  
Operational Conditions ...................................................23  
Smelly Water...................................................................23  
“Air” in Hot Water Faucets ..............................................23  
High Temperature Shut Off System ................................23  
PERIODIC MAINTENANCE...................................................24  
Venting System Inspection..............................................24  
Burner Inspection............................................................24  
Burner Cleaning..............................................................24  
Housekeeping........................................................... 24-25  
Anode Rod Inspection.....................................................25  
Temperature-Pressure Relief Valve Operation ...............25  
Draining...........................................................................25  
Drain Valve Washer Replacement............................ 25-26  
Service............................................................................26  
LEAKAGE CHECKPOINTS....................................................26  
REPAIR PARTS......................................................................27  
TROUBLESHOOTING ..................................................... 28-30  
WARRANTY...........................................................................31  
GENERAL SAFETY..................................................................3  
TABLE OF CONTENTS............................................................4  
INTRODUCTION......................................................................4  
Preparing for the New Installation.....................................4  
INSTALLATION REQUIREMENTS FOR THE  
COMMONWEALTH OF MASSACHUSETTS...........................5  
TYPICAL INSTALLATION..................................................... 6-7  
LOCATING THE NEW WATER HEATER............................. 8-9  
Facts to Consider About Location................................. 8-9  
Insulation Blankets............................................................9  
Combustion Air and Ventilation for Appliances  
Located in Unconned Spaces.........................................9  
Combustion Air and Ventilation for Appliances  
Located in Conned Spaces....................................... 9-10  
INSTALLING THE WATER HEATER................................ 10-21  
Water Piping ..............................................................11-12  
Temperature-Pressure Relief Valve ................................12  
Gas Piping ......................................................................13  
Sediment Traps...............................................................14  
Blower Assembly Installation ..........................................14  
Vent Pipe Connection to Blower Assembly.....................15  
Venting and Installation............................................. 15-16  
LIGHTING & OPERATING LABEL.........................................21  
TEMPERATURE REGULATION ............................................22  
INTRODUCTION  
Thank You for purchasing this water heater. Properly installed and  
maintained, it should give you years of trouble free service.  
2. The installation must conform with these instructions and the local code  
authority having jurisdiction. In the absence of local codes, installations  
shall comply with the National Fuel Gas Code ANSI Z223.1/NFPA  
54 and the National Electrical Code, NFPA 70. These publications  
are available from The National Fire Protection Association, 1  
Batterymarch Park, Quincy, MA 02269.  
Abbreviations Found In This Instruction Manual:  
• CSA - Canadian Standards Association  
• ANSI - American National Standards Institute  
• NFPA - National Fire Protection Association  
• ASME - American Society of Mechanical Engineers  
• GAMA - Gas Appliance Manufacturer’s Association  
• UL - Underwriters Laboratories Inc.  
3. The water heater when installed must be grounded in accordance  
with the local codes, or in the absence of local codes: In the United  
States, the National Electrical Code. ANSI/NFPA 70.  
4. If after reading this manual you have any questions or do not  
understand any portion of the instructions, call the local gas utility or  
the manufacturer whose name appears on the rating plate.  
This gas-red water heater is design certied by Underwriters Laboratories  
Inc. under American National Standard/CSA Standard for Gas Water  
Heaters ANSI Z21.10.1 • CSA 4.1 (current edition).  
5. Carefully plan the place where you are going to put the water heater.  
Correct combustion, vent action, and vent pipe installation are  
very important in preventing death from possible carbon monoxide  
poisoning and res, see Figures 1 and 2.  
PREPARING FOR THE INSTALLATION  
Examine the location to ensure the water heater complies with the  
“Locating the New Water Heater” section in this manual.  
1. Read the “General Safety” section, page 3 of this manual rst and  
then the entire manual carefully. If you don’t follow the safety rules,  
the water heater will not operate properly. It could cause DEATH,  
SERIOUS BODILY INJURY AND/OR PROPERTY DAMAGE.  
6. For California installation this water heater must be braced, anchored,  
or strapped to avoid falling or moving during an earthquake. See  
instructions for correct installation procedures. Instructions may be  
obtained from California Ofce of the State Architect, 400 P Street,  
Sacramento, CA 95814.  
This manual contains instructions for the installation, operation,  
and maintenance of the gas-red water heater. It also contains  
warnings throughout the manual that you must read and be aware  
of. All warnings and all instructions are essential to the proper  
operation of the water heater and your safety. Since we cannot put  
everything on the rst few pages, READ THE ENTIRE MANUAL  
BEFORE ATTEMPTING TO INSTALL OR OPERATE THE WATER  
HEATER.  
7. Massachusetts Code requires this water heater to be installed in  
accordance with Massachusetts 248-CMR 2.00: State Plumbing Code  
and 248-CMR 5.00. For more information see next page.  
8. Complies with SCAQMD rule #1121 and districts having equivalent  
NOx requirements.  
4
INSTALLATION REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS  
For all side wall terminated, horizontally vented power vent, direct vent, and power direct vent gas fueled water heaters installed  
in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by  
the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above nished grade in the  
area of the venting, including but not limited to decks and porches, the following requirements shall be satised:  
INSTALLATION OF CARBON MONOXIDE DETECTORS At the time of installation of the side wall horizontal vented gas  
fueled equipment, the installing plumber or gastter shall observe that a hard wired carbon monoxide detector with an alarm  
and battery back-up is installed on the oor level where the gas equipment is to be installed. In addition, the installing plumber  
or gastter shall observe that a battery operated or hard wired carbon monoxide detector with an alarm is installed on each  
additional level of the dwelling, building or structure served by the sidewall horizontal vented gas fueled equipment. It shall  
be the responsibility of the property owner to secure the services of qualied licensed professionals for the installation of hard  
wired carbon monoxide detectors.  
In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an attic, the hard wired  
carbon monoxide detector with alarm and battery back-up may be installed on the next adjacent oor level.  
In the event that the requirements of this subdivision can not be met at the time of completion of installation, the owner shall  
have a period of thirty (30) days to comply with the above requirements provided that during said thirty (30) day period, a bat-  
tery operated carbon monoxide detector with an alarm shall be installed.  
APPROVED CARBON MONOXIDE DETECTORS Each carbon monoxide detector as required in accordance with the above  
provisions shall comply with NFPA 720 and be ANSI/UL 2034 listed and CSA certied.  
SIGNAGE Ametal or plastic identication plate shall be permanently mounted to the exterior of the building at a minimum height  
of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appli-  
ance or equipment. The sign shall read, in print size no less than one-half (1/2) inch in size, “GAS VENT DIRECTLY BELOW.  
KEEP CLEAR OF ALL OBSTRUCTIONS.”  
INSPECTION The state or local gas inspector of the side wall horizontally vented gas fueled equipment shall not approve the  
installation unless, upon inspection, the inspector observes carbon monoxide detectors and signage installed in accordance  
with the provisions of 248 CMR 5.08(2)(a) 1 through 4.  
EXEMPTIONS: The following equipment is exempt from 248 CMR 5.08(2)(a)1 through 4:  
1. The equipment listed in Chapter 10 entitled “Equipment Not Required To Be Vented” in the most current edition of NFPA 54  
as adopted by the Board; and  
2. Product Approved side wall horizontally vented gas fueled equipment installed in a room or structure separate from the  
dwelling, building, or structure used in whole or in part for residential purposes.  
MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM PROVIDED When the manufacturer of Product  
Approved side wall horizontally vented gas equipment provides a venting system design or venting system components with  
the equipment, the instructions provided by the manufacturer for installation of the equipment and the venting system shall  
include:  
1. Detailed instructions for the installation of the venting system design or the venting system components; and  
2. A complete parts list for the venting system design or venting system.  
MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED When the manufacturer of  
a Product Approved side wall horizontally vented gas fueled equipment does not provide the parts for venting the ue gases,  
but identies “special venting systems,” the following requirements shall be satised by the manufacturer:  
1. The referenced “special venting system” instructions shall be included with the appliance or equipment installation  
instructions; and  
2. The “special venting systems” shall be Product Approved by the Board, and the instructions for that system shall include a  
parts list and detailed installation instructions.  
A copy of all installation instructions for all Product Approved side wall horizontally vented gas fueled equipment, all venting  
instructions, all parts lists for venting instructions, and/or all venting design instructions shall remain with the appliance or  
equipment at the completion of the installation.  
5
TYPICAL INSTALLATION  
GET TO KNOW YOUR WATER HEATER - GAS MODELS  
A
B
C
D
E
F
G
H
J
Vent Pipe–Exhaust  
Vent Terminal  
N
O
P
Flue  
Z
Air Intake Screen - Base Pan  
Flue Bafe Assembly**  
Insulation  
Control Harness  
Rating Plate  
AA Inner Door  
B B Outer Door  
Vent Adapter-Rubber Boot  
Blower Assembly  
Cold Water Inlet  
Inlet Water Shut-off Valve  
Union  
Q
R
S
T
U
V
CC HSI Burner Assembly  
D D Air Intake Screen -  
Blower Assembly  
E E FV Sensor/Bracket Assembly  
(40K & 50K Models Only)  
F F FV Sensor/Bracket Assembly  
(55K & 62.5K Models Only)  
Gas Supply  
Manual Gas Shut-off Valve  
Ground Joint Union  
Drip Leg (Sediment Trap)  
Drain Valve  
Gas Control Valve  
Drain Pan  
Inlet Dip Tube  
Anode**  
Hot Water Outlet  
K
L
M
W
X
Outlet Receptacle (115 VAC)  
Temperature-Pressure Relief Valve  
Y
* ALL PIPING MATERIALS TO BE SUPPLIED BY CUSTOMERS.  
** LOCATED UNDER THE BLOWER ASSEMBLY.  
NATURAL HOT SURFACE IGNITER & MAIN BURNER  
HOT  
SURFACE  
IGNITOR  
SENS
PROPANE HOT SURFACE IGNITER & MAIN BURNER  
HOT  
SURFACE  
IGNITOR  
SENSOR  
GAS CONTROL VALVE-THERMOSTAT  
TEMPERATURE INDICATORS  
*CAUTION: 115 VAC IN CONTROL HARNESS  
AND INSIDE OUTER DOOR  
TEMPERATURE ADJUSTMENT BUTTONS  
GAS MODELS  
WITH HOT SURFACE IGNITION  
& 2", 3" OR 4" PVC VENT CAPABILITY  
FIGURE 1.  
6