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GAS-FIRED COMMERCIAL
COPPER BOILERS
FOR HYDRONIC HEATING
AND HOT WATER SUPPLY
USER'S INFORMATION MANUAL
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.
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.
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.
PRINTED IN U.S.A. 2527 300
WARNING
WARNING
PLEASE KEEP THESE INSTRUCTIONS ADJACENT TO BOILER AND
NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
GB/GW-200, -300, -400, -500, -650, -750
SERIES 200, 201, 202, 203
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.
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.
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.
INDEX
GENERAL . . . . . . . . . . . . . . . . . . . . . . .
LIGHTING INSTRUCTIONS . . . . . . . .
OPERATING SEQUENCE,
IGNITION CONTROL AND DIA-SCAN II
INSTRUCTIONS. . . . . . . . . . . . . .
MAINTENANCE . . . . . . . . . . . . . .
CONNECTION DIAGRAM
WARRANTY. . . . . . . . . . . . . . . . . . . . . .
A DIVISION OF A.O. SMITH CORPORATION
EL PASO, TX MC BEE, SC RENTON, WA
STRATFORD, ONTARIO
VELDHOVEN, THE NETHERLANDS
www.hotwater.com
1
WARNING
WARNING
PAGE
1
2 - 3
4 - 8
8
9
10
PART NO. 210890-000 REV. 1
SUPERSEDES PART NO. 210311-000
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Table of Contents
Related Manuals for A.O. Smith GB/GW-200
Summary of Contents for A.O. Smith GB/GW-200
- Page 1 PLEASE KEEP THESE INSTRUCTIONS ADJACENT TO BOILER AND PRINTED IN U.S.A. 2527 300 GB/GW-200, -300, -400, -500, -650, -750 These models have an automatic hot surface ignition system mounted on the combustion chamber panel inside the front jacket.
- Page 2 THE UNIT SHOULD NOT BE INSTALLED DIRECTLY ON A CARPETED FLOOR. A FIRE HAZARD MAY RESULT. Instead, the boiler must be installed on the A. O. Smith Combustible Floor Kit Base or concrete blocks extending beyond the full width and depth of the boiler by at least 3 (76.2mm) inches.
- Page 3 Lighting Instructions for the G(B/W) 650 and 750 models...
-
Page 4: Dia-Scan Ii Display Board Operating Procedures
ELECTRONIC HOT SURFACE IGNITION CONTROL BOARD ALL MODELS - The WHC1502 ignition control board is a fully integrated, state of the art electronic control system. The ignition control board includes a microprocessor, which governs all temperature and ignition control functions for the appliance. Inherent in the design are the normal operating sequences and safety features associated with a gas ignition control system. - Page 5 Figure 1. Dia-Scan II Display Board. Green Status Lights LED 1: Call for Heat LED 2: Flow Switch LED 3: Pressure Switch LED 4: Ignitor Current LED 5: Gas Valve LED 6: Flame Sense Red Fault Lights LED 7: Ignition Fail LED 8: Circulate Failure LED 9: Blower Failure LED 10: Blocked Inlet...
-
Page 6: Tank Probe Installation Procedure
To change or view the current programmed post-circulating time: Press the SELECT push-button on the display board until the LED display reads OPt (Options). To enter into the options mode, press the ENTER/RESET push- button. The display will illustrate Circ. Enter this mode by pressing the ENTER/RESET push-button. -
Page 7: Troubleshooting Ignition System
Figure 2. WHC 1502 Ignition Control Board DANGER HOT WATER TEMPERATURES REQUIRED FOR AUTOMATIC DISHWASHER AND LAUNDRY USE CAN CAUSE SCALD BURNS RESULTING IN SERIOUS PERSONAL INJURY AND/ OR DEATH. THE TEMPERATURE AT WHICH INJURY OCCURS VARIES WITH THE PERSON'S AGE AND TIME OF EXPOSURE. THE SLOWER RESPONSE TIME OF DISABLED PERSONS INCREASES THE HAZARDS TO THEM. -
Page 8: Burner System
Troubleshooting The WHC1502 Series Control System has many inherent diagnos- tic and fault detection routines built into its operating hardware and software. These routines, in conjunction with the four (4) digit LED display and eleven (11) LED status indicators on the Display Board, can greatly assist any service person in quickly pinpointing the source of a problem which may occur within the appliance. - Page 9 FIGURE 3. POINT TO POINT WIRING DIAGRAM...
- Page 10 NEW BOILER LIMITED WARRANTY A. O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the owner of this hydronic boiler: If within TEN years after initial installation of the boiler, the heat exchanger shall prove upon examination by the warrantor to be defective in material or workmanship, the warrantor, at his option, will exchange or repair such part or portion.