Honeywell AQUASTATIC L7224 Series Technicianís Quick Reference Manual
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Honeywell AQUASTATIC L7224 Series, TECHNICIAN’S QUICK REFERENCE GUIDE 69-1957—1 L7224 Series Oil Electronic Aquastat® Controller The following service procedure provides a quick overview for L7224 Series Controllers. For more information, refer to form 69-1384. 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 requi
69-1957—1 2 L7224 SERIES Pressing the I button again will display the LL (Low Limit) followed by a three-digit number and the corresponding degree designator. See the table below for an explanation of display readout. 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. Ta
Honeywell AQUASTATIC L7224 Series, 3 69-1957—1 L7224 SERIES Table 2. L7224 Controller Operating Sequence Troubleshooting When attempting to diagnose system performance, reference the LED display to help identify specific areas not working properly. The LED display will scroll “err”, followed by a digit (1-8). See Table 1 for a description of the error and suggested actions. See below for a troubleshooting guide. Action System Response Thermostat calls for heat. Circulator starts when water temperature is above Low Limit setting (if appli
Honeywell AQUASTATIC L7224 Series, Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Toronto, Ontario M1V 4Z9 customer.honeywell.com ® U.S. Registered Trademark © 2006 Honeywell International Inc. 69-1957—1 Rev. 06-06 Boiler is cold, house is cold Display is ON; TT-LED is ON B1 LED is ON 120 Vac at B1- B2 • If no, replace control. • If yes, check burner and wiring Display is ON; TT-LED is ON Refer to err on display — Boiler is hot, house is cold Display is ON; TT-LED is ON C1 LED is ON 120 Vac at C1- C2 • 120 Vac
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