AO Smith Boiler VBVW 750 User Manual

GAS-FIRED COPPER BOILERS FOR  
HYDRONIC HEATING AND HOT WATER SUPPLY  
INSTRUCTION MANUAL  
MODELS:  
VB/VW-500, 750 AND 1000  
SERIES 200/201  
Installation  
Operation  
Maintenance  
Limited Warranty  
WARNING: If the information in this  
manual is not followed exactly, a fire or  
explosion may result causing property  
damage, personal injury or loss of life.  
— Do not store or use gasoline or other  
flammable vapors and liquids in the  
vicinity of this or any other appliance.  
— WHAT TO DO IF YOU SMELL GAS:  
• Do not try to light any appliance.  
• 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.  
— Installation and service must be  
performed by a qualified installer,  
service agency or the gas supplier.  
MC BEE, SC., RENTON, WA.,  
STRATFORD-ONTARIO, VELDHOVEN-THE NETHERLANDS,  
NANJING, CHINA  
PRINTED 0911  
320856-001  
SAFE INSTALLATION, USE AND SERVICE  
The proper installation, use and servicing of this boiler is extremely important to your safety and the safety of others.  
Many safety-related messages and instructions have been provided in this manual and on your boiler 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 boiler.  
This is the safety alert symbol. It is used to alert you to  
potential personal injury hazards. Obey all safety  
messages that follow this symbol to avoid possible  
injury or death.  
DANGER indicates an imminently  
hazardous situation which, if not avoided,  
will result in injury or death.  
DANGER  
WARNING indicates a potentially hazardous  
situation which, if not avoided, could result  
in injury or death.  
WARNING  
CAUTION indicates a potentially hazardous  
situation which, if not avoided, could result in  
minor or moderate injury.  
CAUTION  
CAUTION used without the safety alert  
symbol indicates a potentially hazardous  
CAUTION  
situation which, if not avoided, could result in  
property damage.  
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.  
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 listed in the Act.  
IMPORTANT DEFINITIONS  
Qualified Installer: A qualified installer must have ability equivalent to a licensed tradesman in the fields 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 fired boilers. The qualified installer must have a thorough understanding of this instruction manual.  
• Service Agency: A service agency also must have ability equivalent to a licensed tradesman in the fields 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 fired boilers. 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
DIMENSION AND CAPACITY DATA  
• 0” (0mm) top & sides  
• 6” (152mm) vent  
FIGURE 1.  
TABLE 1. - GAS AND ELECTRICAL CHARACTERISTICS  
Manifold Pressure  
Maximum Supply Pressure  
Minimum Supply Pressure  
Model  
Type of Gas  
NATURAL  
PROPANE  
Inches W.C.  
-2 to -3.5  
kPa  
Inches W.C.  
kPa  
3.44  
3.44  
Inches W.C.  
kPa  
2.0  
2.0  
VB/VW-500, 750, 1000  
VB/VW-500, 750, 1000  
-.5 to .9  
-.5 to .9  
14  
14  
4.0  
8.0  
-2 to -3.5  
Minimum Pressures must be maintained during all operating conditions.  
Electrical Power: 120v, 60hz, and 30 amps.  
TABLE 2. - ROUGH-IN DIMENSIONS  
Models  
VB/VW-500  
inches  
VB/VW-750  
VB/VW-1000  
Dimensions  
mm  
152  
102  
inches  
mm  
152  
102  
inches  
mm  
Flue Outlet Diameter  
6
4
6
4
6
4
152  
102  
Air Intake Diameter  
Water Inlet  
2” NPT  
2” NPT  
1” NPT  
Water Outlet  
Gas Inlet  
A
B