Adjusting Settings - Honeywell L7224U Manual Del Usaurio

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
5
Display
HL_ High Limit.
Hdf High Limit Differential.
LL_ Low Limit.
Ldf Low Limit Differential.
duu ZR input configured as external Domestic
Hot Water (DHW) request (ON/OFF)
ASC Anti Short-Cycle Timeout (seconds); "OFF" is
disabled.
otL Outdoor Temperature Low (minimum)
parameter for the outdoor reset curve (F or
C)*
otH Outdoor Temperature High (maximum)
parameter for outdoor reset curve (F or C)*
btL Boiler Temperature Low (minimum)
parameter for outdoor reset curve*
bP Boost Period (minutes). "OFF" is displayed if
Boost is inactive*
bS Boost step (F or C) shown only if Boost is
active (bP=ON)*
UUS Warm Weather Shutdown Temperature (F or
C)*
tPL** Thermal Purging Limit Temperature (°F or
°C), "OFF" if disabled
tPt** Termal Purging Time Delay (minutes), shown
only if tPL is enabled
PC Pump Cycling (ON / OFF)
F-C Temperature units (°F or °C)
* Settings available for adjustment on the 3-digit dis-
play 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.
®
CONTROLLER
Definition
69-1720EFS—11