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Hersteller: Honeywell Dateigröße: 259.52 kb Dateiname: 69_1957.pdf Unterrichtssprache:

On the L7224U the High Limit, High Limit Differential, Low Limit, and Low Limit Differential can be adjusted to the settings recommended by the boiler OEM. Adjusting Settings To discourage unauthorized changing of Aquastat® settings, a procedure to enter the adjustment mode is required. To enter the adjustment mode, press the UP, DOWN, and I buttons simultaneously for three seconds. Press the I button until the feature requiring adjustment is displayed: . HL.High Limit. . LL.Low Limit. . Ldf.Low Limit differential. . F - C.°F or °C. Then press the UP and/or DOWN buttons to move the set point to the desired value. After 60 seconds without any button inputs, thecontrol will automatically return to the READ mode. To use the L7224U in a cold start boiler application, disable the Low Limit function by pressing the UP arrow button, DOWN arrow button and I buttons simultaneously for three seconds. Then push the I button until LL is displayed. Then press the down arrow button until OFF is displayed. Display In the RUN mode, the Aquastat® will flash .bt. (boiler temp) followed by the temperature (i.e., 220), followed by °F or °C. To read boiler settings, press the I key to read the parameter of interest. For example, press I (HL) High Limit is displayed, followed by a three-digit number, i.e., 220, followed by °F or °C. 69-1957—1 L7224 SERIES L7224 SERIES After approximately 60 seconds without any key presses, the display will enter a dim display mode. To return to the bright display mode, simply press and release any key. Display Text Description Shows bt Boiler Temperature HL High Limit LL Low Limit Hdf High Limit Differential Ldf Low Limit Differential tt Local Thermostat Status tte Enviracom Thermostat Status brn Burner Status cir Circulator Status Zc Zone Control Zr Zone Request err Error Code f Degrees Fahrenheit c Degrees Celsius M22149 Table 1. LED Error Codes Error Code Cause/Action Err1 Sensor fault; check sensor. Err2 ECOM fault; check EnviraCOM. wiring. Err3 Hardware fault; replace control. Err4 B1 fault; check B1 wiring/voltage. Err5 Low Line; Check L1-L2, 110 Vac. Err6 Fuse; Check ECOM wires, Replace fuse. Err7 EEPROM, HL, LL, Hdf, Ldf, Reset to default values. Err8 Repeated B1 fault (voltage present at B1 when output is turned off); check B1 wiring/voltage. 69-1957.1 2 L7224 SERIES L7224 SERIES Action System Response Thermostat calls for heat. Circulator starts when water temperature is above Low Limit setting (if applicable). Boiler temperature is checked. Burner starts when water temperature is below High Limit setting. Boiler exceeds the High Limit. Burner is turned off. Burner restarts when the water temperature drops below the High Limit setting minus the differential. Thermostat is satisfied. Circulator and burner turn off. Error conditions 1-5. If an error condition is detected, all outputs except ZC are shut down. Burner is off. Control continues to function and restarts when error is corrected. During the error check sequence, the ...

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