A.O. Smith HW 420 Installation Operation & Maintenance

MODELS HW/HWB 300, 399, 420, 520, 610, 670
GAS-FIRED COMMERCIAL COPPER BOILERS FOR
HYDRONIC HEATING AND HOT WATER SUPPLY
• INSTALLATION
WARNING: If the information in this manual
is not followed exactly, a fire or explosion
may result causing property damage,
personal injury or death.
— 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.
PRINTED IN U.S.A. 0905
UP-FLOW MODELS
• OPERATION •
• INDOOR ONLY
PLACE THESE INSTRUCTIONS ADJACENT TO BOILER AND
NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE
MAINTENANCE
TEXT PRINTED OR OUTLINED IN RED CONTAINS INFORMATION
RELATIVE TO YOUR SAFETY. PLEASE READ THOROUGHLY
BEFORE USING APPLIANCE.
A DIVISION OF A.O. SMITH CORPORATION
MC BEE, SC SEATTLE, WA
VELDHOVEN, THE NETHERLANDS
SUPERSEDES PART NO'S, 210288-000 REV. 01 & 192356-000
1 1 1 1 1
• LIMITED WARRANTY
CAUTION
STRATFORD, ONTARIO
w w w.hotwater.com
PART NO. 211683-000 REV.02