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Honeywell AQUASTATIC L7224 Series Technicianís Quick Reference Manual

Oil electronic aquastat controller.
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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 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, the
control 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.
TECHNICIAN'S QUICK REFERENCE GUIDE
69-1957—1

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Table of Contents

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   Summary of Contents for Honeywell AQUASTATIC L7224 Series

  • Page 1 L7224 Series Oil Electronic Aquastat® Controller TECHNICIAN’S QUICK REFERENCE GUIDE 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.
  • Page 2: Display Status

    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.
  • Page 3: Troubleshooting

    L7224 SERIES Table 2. L7224 Controller Operating Sequence Action System Response Thermostat Circulator starts when water temperature is calls for heat. above Low Limit setting (if applicable). Boiler temperature is checked. Burner starts when water temperature is below High Limit setting. Boiler exceeds Burner is turned off.
  • Page 4 . ZC LED OFF indicates ZC terminal power is ON. 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...

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  • Bill grigs Jan 03, 2020 08:28:
    How do you clear an ERR 8 code on a Honeywell aquastat