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.
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.
69-1957—1
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.
|
|
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 |
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