Adjusting Settings - resideo Aquastat L7224U Manual Del Usuario

The overall range of the High Limit is from 130 °F to
240 °F (54 °C to 116 °C). Select devices may have
different ranges. Some models have limited ranges on
the High Limit setpoint; this limited range is listed on the
device label.
The range of the Low Limit is from 110 to 220 °F (43 to
104 °C). Select devices may have different ranges. The
range of the Anti-Short Cycle time is from OFF to five
minutes.
If an Outdoor Reset Module is installed, the reset curve
can be set by entering the minimum outdoor
temperature, minimum (water or boiler) temperature, and
maximum outdoor temperature on the 3-digit display.
The range of the minimum outdoor temperature is from -
40 to 40 °F (-40 to 4.4 °C) and has a default setting of
0 °F (-18 °C). The range of the maximum outdoor
temperature is from 30 to 70 °F (-1 to 21 °C) and has a
default setting of 40 °F (4.4 °C). The range of the
minimum (water or boiler) temperature is from 80 to
180 °F (27 to 82 °C) and has a default setting of 130 °F
(54 °C). See the "Outdoor Reset Module" Installation
Instructions (form number 69-2335) for more
information on setting the boiler reset curve and all
related parameters.
The L7224U is designed for use with 24 Vac electronic
and electromechanical thermostats or EnviraCOM™
enabled thermostats, and have screw-type terminals for
easy field connection.
To replace a L8148A,C L7148A or L7248A,C controller, the
Low Limit function must be disabled; see Adjusting
Settings for directions.

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 (refer to Fig. 8) simultaneously for
three seconds. Press the I button until the feature
requiring adjustment is displayed:
L7224U OIL AND ELECTRIC BOILER ELECTRONIC AQUASTAT
Display
HL_
Hdf
LL_
Ldf
duu
ASC
otL
otH
btL
bP
bS
UUS
tPL**
tPt**
PC
F-C
* Settings available for adjustment on the 3-digit display
only if a W8735Y1000 or W8735S1000 Outdoor Reset
Kit is installed.
**Settings available for adjustment only when the
W8735Y1000 or W8735S1000 Outdoor Reset Kit is NOT
installed.
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 controller will automatically return to
the RUN 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 button 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 and HL (High
Limit) is displayed, followed by a three-digit number, i.e.,
220, followed by °F or °C. Pressing the I button again will
display the LL (Low Limit) followed by a three-digit
number and the corresponding degree designator. See
Table 3 for 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.
5
Definition
High Limit.
High Limit Differential.
Low Limit.
Low Limit Differential.
ZR input configured as external Domestic Hot
Water (DHW) request (ON/OFF)
Anti Short-Cycle Timeout (seconds); "OFF" is
disabled.
Outdoor Temperature Low (minimum)
parameter for the outdoor reset curve (F or C)*
Outdoor Temperature High (maximum)
parameter for outdoor reset curve (F or C)*
Boiler Temperature Low (minimum) parameter
for outdoor reset curve*
Boost Period (minutes). "OFF" is displayed if
Boost is inactive*
Boost step (F or C) shown only if Boost is
active (bP=ON)*
Warm Weather Shutdown Temperature (F or
C)*
Thermal Purging Limit Temperature (°F or °C),
"OFF" if disabled
Termal Purging Time Delay (minutes), shown
only if tPL is enabled
Pump Cycling (ON / OFF)
Temperature units (°F or °C)
®
CONTROLLER
69-1720EFS—13