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LIGHTING INSTRUCTIONS
These models have an automatic hot surface ignition system
mounted on the combustion chamber panel inside the front jacket.
This hot surface igniter ignites the main burner gas whenever the
system control calls for heat.
Before proceeding with operation of the unit, make sure the boiler
and system are filled with water and all air is expelled from the boiler,
radiator tank(s) and piping.
WARNING
THE MAIN MANUAL GAS SHUT-OFF VALVE MUST HAVE BEEN
CLOSED FOR AT LEAST FIVE (5) MINUTES BEFORE
LIGHTING. This waiting period is an important safety step.
Its purpose is to permit gas that might have accumulated in
the combustion chamber to clear. IF YOU DETECT GAS AT
THE END OF THE PERIOD DO NOT PROCEED WITH
LIGHTING. RECOGNIZE THAT GAS ODOR, EVEN IF IT SEEMS
WEAK, MAY INDICATE PRESENCE OF ACCUMULATED GAS
SOMEPLACE IN THE AREA WITH A RISK OF FIRE OR
EXPLOSION.
WARNING
THERE IS A RISK IN USING FUEL BURNING APPLIANCES SUCH
AS GAS WATER BOILERS IN ROOMS, GARAGES OR OTHER
AREAS WHERE GASOLINE AND OTHER FLAMMABLE LIQUIDS
ARE USED OR STORED, OR ENGINE-DRIVEN EQUIPMENT OR
VEHICLES ARE STORED, OPERATED OR REPAIRED.
FLAMMABLE VAPORS ARE HEAVY AND TRAVEL ALONG THE
FLOOR AND MAY BE IGNITED BY THE BOILER'S MAIN BURNER
FLAMES CAUSING FIRE OR EXPLOSION. Some local codes
permit operation of gas appliances if installed 18 inches or more
above the floor. This may reduce the risk if location in such an
area cannot be avoided.
GAS-FIRED COMMERCIAL
COPPER BOILERS
FOR HYDRONIC HEATING
AND HOT WATER SUPPLY
USER'S INFORMATION MANUAL
A DIVISION OF A.O. SMITH CORPORATION
EL PASO, TX MC BEE, SC RENTON, WA
STRATFORD, ONTARIO
VELDHOVEN, THE NETHERLANDS
www.hotwater.com
GB/GW-200, -300, -400, -500, -650, -750
SERIES 200, 201, 202, 203
INDEX PAGE
GENERAL . . . . . . . . . . . . . . . . . . . . . . . 1
LIGHTING INSTRUCTIONS . . . . . . . . 2 - 3
OPERATING SEQUENCE,
IGNITION CONTROL AND DIA-SCAN II
INSTRUCTIONS. . . . . . . . . . . . . . 4 - 8
MAINTENANCE . . . . . . . . . . . . . . 8
CONNECTION DIAGRAM 9
WARRANTY. . . . . . . . . . . . . . . . . . . . . . 10
WARNING
Should overheating occur or the gas supply fail to shut off, do
not turn off or disconnect the electrical supply to the pump.
Instead, shut off the gas supply at a location external to the
appliance.
WARNING
Do not use this boiler if any part has been under water.
Immediately call a qualified service technician to inspect the
boiler and to replace any part of the control system and any
gas control which has been under water.
PLEASE KEEP THESE INSTRUCTIONS ADJACENT TO BOILER AND
NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
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
• Extinguish any open flame.
• 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.
PART NO. 210890-000 REV. 1
SUPERSEDES PART NO. 210311-000
PRINTED IN U.S.A. 2527 300