National Products Series B, BW3 instruction manual Safety Considerations

CHIMNEY AND VENT PIPE CONNECTION	7-9
Checking Chimney	8
Minimum Vent Pipe Clearance	8
Removing Existing Boiler from Common Venting System	9
OPTIONAL HORIZONTAL VENTING WITH POWER VENTER	9-10
GAS SUPPLY PIPING	10-11
Checking Gas Supply	10
Connecting Gas Piping	10-11
Checking Gas Piping	11
ELECTRICAL WIRING	12
Electric Power Supply	11
Installing Thermostat	11
Wiring Diagram	12
SEQUENCE OF OPERATION	11
EQUIPMENT AND OPTIONAL ACCESSORIES	13-14
Relief Valve	...13
Expansion Tank (Optional)	13
Diaphragm-Type Expansion Tank (Optional)	13
Air-Eliminating Fitting (Air Purger) (Optional)	13
Main Air Vent for Downflow Systems or Diaphragm-Type Expansion Tank (Optional)	13
Automatic Fill Valve (Optional)	13
Drain Valve	....13
Water Temperature Control	13
Circulating Pump	14
Blower (Draft Inducer)	14
Pressure Switch	14
Rollout Switch (Flame Rollout Safety Shutoff)	14
STARTING BOILER	14
How a Hot Water System Operates	14
Filling System with Water	14
FOR YOUR SAFETY READ BEFORE OPERATING	14-15
GAS VALVE OPERATING INSTRUCTIONS	15
CHECKING AND ADJUSTING	16
Gas Valve Safety Shutdown Test	16
Pilot Burner Adjustment	16
Main Burner Air Adjustment	16
Limit Controls Adjustment	16
Thermostat Heat Anticipator Adjustment	16
Safety Controls Check	16
MAINTAINING BOILER	17-18
Burners	17
Relief Valve	...17
Expansion Tank	17
Boiler Flue Passages	17
Vent Pipe	17
Water System	.17
Cleaning Boiler and Burners	17-18
Blower	18
SERVICE HINTS	1 9
REPAIR PARTS	20-2 3

SAFETY CONSIDERATIONS

Installing and servicing heating equipment can be hazardous due to gas and electrical components. Only trained and qualified personnel should install, repair, or service heating equipment. Untrained personnel can perform basic maintenance functions such as maintaining water level. All other operations must be performed by trained service personnel. When working on heating equipment, observe precautions in literature, on tags, and on labels attached to or shipped with unit and other safety precautions that may apply.

→Follow all safety codes. In the United States, follow all safety codes including the National Fuel Gas Code (NFGC) NFPA 54-1999/ANSI Z223.1-1999. In Canada, refer to the current edition of the National Standard of Canada CAN/CGA-B149.1- and .2-M95 Natural Gas and Propane Installation Codes (NSCNGPIC). Wear safety glasses and work gloves. Have fire extinguisher available during start-up and adjustment procedures and service calls.

Recognize safety information. This is the safety-alert symbol . When you see this symbol on unit or in instructions and manuals, be alert to potential for personal injury.

→Understand the signal words DANGER, WARNING, CAUTION, and NOTE. These words are used with safety-alert symbol. DANGER identifies most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices which would result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.

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