Assessments - 3, GPA: 4.7 ( )

Fabricante : Wayne Arquivo Tamanho: 243.87 kb Arquivo Nome : Língua de Ensino:

The pressure should be neutral at the center. Closing the adjuster lowers the neutral pressure point and opening the adjuster raises the neutral pressure point. Once the neutral pressure point has been adjusted, the combination air shutter should be adjusted so that the percent CO2 test must be made at the inlet side of the draft hood. If the CO2 reading is not within the recommended limits, then the combustion air shutter should be re-adjusted and then the neutral pressure point be rechecked and reset if necessary. IT IS ESSENTIAL TO MAKE CERTAIN THAT THE PRODUCTS OF COMBUSTION DO NOT CONTAIN CARBON MONOXIDE, CO. It is possible to have flame impingement on cold surfaces with resultant CO even if CO2 and O2 are within acceptable limits. The flue gas sample is taken through the same hole used for the CO2 test. CO test instrument must be used for this test. The most common causes of CO are flame impingement on cool surface and insufficient primary air, both of which could be caused by over firing. The only answer is to reduce the firing rate or increase the primary air. Combustion efficiency is determined by the percent CO2 and the temperature of the flue gases. These two measurements are taken on the inlet side of the draft hood. Combustion efficiency and stack loss calculators provide slide rule convenience for correlating CO2 and stack temperature readings. These calculators are available from several manufactures of combustion test equipment. IMPORTANT DRAFT - When installing Wayne power gas burners in oil fired boilers a minimum negative draft of .02” (4.982 Pa) w.c. over fire must be maintained. Refer to your local gas company and codes for assistance. For gad fired equipment requiring a double acting barometric the preferred location of the barometric draft control is part of the bullhead tee shown in figures A, B OR C. During normal operation, flue gases make a right angle turn behind the control, but do not infringe upon it. Should a downdraft occur, air flowing n the opposite direction strikes the control directly, causing it to open outwardly and vents the air into the room with a minimum of resistance. Entrained products of combustion are thus provided grater relief. BEST LOCATIONS FOR GAS WIRING DIAGRAM LADDER FORM FIG. A FIG. B FIG. C WIRING DIAGRAM FOR GAS BURNER WITH STANDING PILOT FIGURE 12 WIRING DIAGRAM LADDER FORM FIGURE 13 11 GENERAL INSTRUCTION Gas burners require the services of an experienced technician for proper setting and adjustment. If the burner does not appear to be operating properly, DO NOT ATTEMPT TO ADJUST THE BURNER YOURSELF, but call in a competent serviceman. A homeowner should be able to check several possible causes of shutdown before calling in a serviceman. The following check list may eliminate the need for a service call or at least provide information for the serviceman. 1. Check thermostat. Make sure that it is set at the desired room temperature. If the thermostat is damaged or loose on the wall, have it replaced or repaired. 2. Check fuses in service box for the burner circuit. Replaceable type fuses should not be loose in the socket. If a fuse is blown out or if in doubt, replace with the same size and type. If circuit breaker are in the service box, check position of indicator. If tripped, reset. 3. Check on-off switch for the burner circuit, it may have been accidentally turned off. 4. With the thermostat set 10 degrees above room temperature, the burner should start automatically. If it does not start, check pilot. If no flame is visible, relight pilot following lighting instructions. It is advisable, periodically, to visually inspect the burner. Check air inlet blower to make sure it is not clogged or blocked. Check air shutter to make sure that it has not been tampered with, make sure that it is in the same position as when final adjustments were made. Check blower wheel to see if it is dirty or full of lint. Open observation door and check pilot flame. If the flame does not appear normal or if in doubt, call a serviceman. The areas around the conversion burner should be kept clear and free of combustible materials, gasoline and other flammable vapors and liquids. The flow of combustion and ventilating air to the burner must not be blocked or obstructed in any manner. CLEANING OF BURNERS: Remove the burner from the appliance and visually inspect the blast tube for any deterioration. On burners equipped with standing pilot or intermittent ignition, inspect pilot burner for dust or corrosion and clean if necessary. Check pilots, thermo-couples, electrodes, etc. with illustrations in the owner’s manual for proper locations. Check flame spreaders if applicable for any deterioration and replace if necessary. Remove corrugated flame ring from the end of the venturi and clean. Visually inspect the inside of the venturi for any excessive rust or corrosion and clean if necessary. Replace corrugated flame ring and reinstall burner. TROUBLE CHART SYMPTOMS CAUSE a. Ai...

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