valutazioni - 2, GPA: 3 ( )

Produttore : Crown Boiler File Size : 936.32 kb File Nome : Lingua di insegnamento:

A CO2 reading within the limits of Table 1 with no measurable CO is desirable. The maximum acceptable CO reading is about 50 PPM. If the CO reading is too high, open the burner air shutter, or air band, slightly to permit more combustion air to the flame. Recheck the CO level and adjust as required. NOTICE: On the Riello 40-F3 burner only, it will be necessary to remove the oil burner sound cover to make adjustments to the oil pump pressure and airflow. The presence of the burner sound cover over the burner acts to restrict airflow to the burner. Thus, combustion quality will be adversely affected when the cover is installed after airflow adjustments are made. If adjustments to burner airflow are made w/o the burner cover, it is necessary to confirm these adjustments produce satisfactory smoke, carbon dioxide, and carbon monoxide readings w/ the burner cover installed. Repeated adjustments and tests may be required. 9) Draft – Draft measurements should be taken through the overfire port and in the vent connector, not more than 12 inches away from the furnace outlet. A 5/16 in. hex washer head bolt plugs the overfire port in the burner mounting plate. Remove the bolt and insert a suitable draft measurement gage. After the chimney (or stack gas passageway) has warmed up to operating temperature, approximately 15 to 20 minutes of burner operation, adjust the barometric damper to obtain the correct overfire draft reading. The overfire draft should read 0.02 in. W.G. The draft measured at the flue (stack draft) should read no more than 0.05 in. W.G. NOTICE: The overfire draft is the more important measurement and should be used to adjust the setting of the barometric draft control. 10) Flue Gas Temperature – The flue gas temperature will vary depending on heat input rate, air temperature rise across the heat exchanger, and air flowrate through the furnace. To prevent excessive water vapor condensation from the flue gases, the gross flue gas temperature should not fall below 330.F. In addition, if the gross flue gas temperature exceeds 650.F, the heating efficiency of the furnace will be reduced. To reduce high flue temperatures, after properly adjusting the burner, check for blocked supply/return airflow. Remove any blockages, increase fan speed, or consider reducing the furnace heat input rate. Also, verify there is no air leakage into the combustion chamber from around the burner mounting flange or heat exchanger mounting plate. If flue gas temperatures are too low, consider increasing the heat input rate or reducing the amount of supply/return airflow. 11) Cycle the furnace several times to verify the burner lights off and shutsdown smoothly without excessive noise or smoke production. Table 1: Oil Burner Application and Specifications for the Crown Furnaces * When operating these furnaces at the lowest input rate (84,000 BTUH), the carbon dioxide (CO2) value may not be able to be adjusted above 12%. This is normal and does not necessarily indicate a problem. Supply/Return Airflow and Air Temperature The supply/return airflow shall be set to obtain an air temperature rise, across the furnace, in the range of 70 to 100.F. Since the flow resistance of each duct system is slightly different, the airflow (fan speed) may have to be changed in the field to achieve a satisfactory temperature rise. Furnace Model: Burner Model:R.W. Beckett, AFR.W. Beckett, NXCarlin Combustion, EZ-1HPRiello, 40-F3Standard Nozzle:Delavan, 0.75 GPH / 80 deg. angle / hollow coneDelavan, 0.60 GPH / 60 deg. angle / semi solid (W) Delavan, 0.65 GPH / 60 deg. angle / hollow coneDelavan, 0.70 GPH / 60 deg. angle / hollow coneOil Pump Pressure (PSIG):130150140150Burner Head Type:F3StandardStandardF3Head / Turbulator Setting:Z = 1.125 in.3A = 0.652Air Band Setting:Fully-closed-0.6- Air Shutter / Damper Setting:5-Fully-closed3Overfire Draft (in. W.G.): Smoke Spot, Max. (Bacharach Scale): Carbon Dioxide, CO2, Maximum (%): Carbon Dioxide, CO2, Minimum (%): Carbon Monoxide, CO (PPM) Oil Solenoid Valve Equipped:NoYesNoYesPrepurge Time (sec): Postpurge Time (sec): Ignition Type: All# 11312* 0.020NoneNoneInterrupted One way to measure the temperature rise across the furnace is to insert temperature measuring devices (e.g. thermometers) into the return air duct and into the supply air duct about 12 inches from the furnace. After the furnace has been firing continually for over 20 minutes, read the temperature difference between the two (2) thermometers. The temperature difference should not exceed 100.F, nor be less than 70.F. A temperature rise of 85.F is considered to be optimum for comfort. For better energy efficiency, a temperature rise closer to 70.F is recommended. The blower (fan) speed fan is adjusted by changing the fan motor winding energized by the control system. The furnace is set on the lowest fan speed, “L”, at the factory, refer to Table 2. To adjust the fan speed, follow this procedure. a. Turn off all electrical power to the furnace a...

Scarica la tua

Per scaricare, digitare 2 cifre :