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FIGURE 3. POINT TO POINT WIRING DIAGRAM 9
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NEW BOILER LIMITED WARRANTY A. O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the owner of this hydronic boiler: 1. 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. This term is reduced to FIVE years if this boiler is used for volume hot water supply purposes other tha
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GAS-FIRED COMMERCIAL
COPPER BOILERS
FOR HYDRONIC HEATING
AND HOT WATER SUPPLY
GB/GW-200, -300, -400, -500, -650, -750
USER'S INFORMATION MANUAL
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
WARNING: If the in
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THE UNIT SHOULD NOT BE INSTALLED DIRECTLY ON A BE PLACED ON OR ADJACENT TO THE BOILER. OPEN CARPETED FLOOR. A FIRE HAZARD MAY RESULT. Instead, CONTAINERS OF FLAMMABLE MATERIAL SHOULD NOT BE the boiler must be installed on the A. O. Smith Combustible Floor STORED OR USED IN THE SAME ROOM WITH THE BOILER. Kit Base or concrete blocks extending beyond the full width and depth of the boiler by at least 3 (76.2mm) inches. If the boiler is Light the unit in accordance with the instructions on the l
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Lighting Instructions for the G(B/W) 650 and 750 models . 3
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ELECTRONIC HOT SURFACE 8. If a flame is confirmed, the control will enter the heating mode where it will continue heating until the set-point tem- IGNITION CONTROL BOARD perature is reached, and the thermostat circuit opens. At ALL MODELS - The WHC1502 ignition control board is a fully that point, the gas valve is closed and the control enters integrated, state of the art electronic control system. The ignition the post-purge and post-circulating cycles. control board includes a microprocesso
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NOTE: The boiler must complete a full cycle in order for the new setting to take effect. If the unit is turned off prior to a complete cycle the setting will be lost and the previous setting will remain in effect. If the ADJUST push-button is held down long enough, the set-point will reach 110°F, the minimum value (or 240°F, the maximum value) and stop. At this point, if the desired set-point is not obtained, re- lease the ADJUST push-button and depress it again. The set-point value wi
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To change or view the current programmed post-circulating time: 3. The display will illustrate Circ. Press the SELECT push-but- ton until the display illustrates Count. Enter this mode by press- 1. Press the SELECT push-button on the display board until the ing the ENTER/RESET push-button. LED display reads OPt (Options). 4. The display will now illustrate the current number of cycles the 2. To enter into the options mode, press the ENTER/RESET push- appliance has cycled through. button. 5. Th
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TANK PROBE JUMPER J33 IS ON AS DEFAULT, READY FOR USE WITH TANK PROBE SUPPLIED WITH THE BOILER (GW MODELS ONLY. SEE FIGURE 3 FOR CONNECTION DIAGRAM). FOR STANDARD TANK CONTROLS (e.g., 24 VAC HONEYWELL AQUASTAT) REMOVE THIS JUMPER AND CONNECT THE CONTROL TO THE BROWN WIRES IN THE JUNCTION BOX ON THE BACK OF THE BOILER. TROUBLESHOOTING IGNITION SYSTEM Figure 2. WHC 1502 Ignition Control Board DANGER Display Board LED Indicators HOT WATER TEMPERATURES
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Troubleshooting surrounding air pressure. Inspection of the boiler and vent system is necessary to insure that flue gas leakage to the surrounding area The WHC1502 Series Control System has many inherent diagnos- does not occur. tic and fault detection routines built into its operating hardware and software. These routines, in conjunction with the four (4) digit LED Inspect the external surfaces of the vent system every 3 months for display and eleven (11) LED status indicators on the Display
