Lennox SL280DFV Installation Instructions Manual page 34

On−Board Links
Note: In icomfortt systems with a conventional outdoor
unit (non−communicating), the on−board clippable links
must be set to properly configure the system
WARNING
Carefully review all configuration information pro-
vided. Failure to properly set DIP switches, jumpers
and on−board links can result in improper operation!
On−Board Link W914 Dehum or Harmony (R to DS)
On−board link W914, is a clippable connection between ter-
minals R and DS on the integrated control. W914 must be
cut when the furnace is installed with either the Harmony
IIIt zone control or a thermostat which features humidity
control. If the link is left intact the PMW signal from the Har-
mony III control will be blocked and also lead to control
damage. Refer to table 20 for operation sequence in ap-
plications including SL280DFV, a thermostat which fea-
tures humidity control and a single−speed outdoor unit.
Table 21 gives the operation sequence in applications with
a two−speed outdoor unit.
On−Board Link W951 Heat Pump (R to O)
On−board link W951 is a clippable connection between ter-
minals R and O on the integrated control. W951 must be cut
when the furnace is installed in applications which include a
heat pump unit and a thermostat which features dual fuel
use. If the link is left intact, terminal O" will remain ener-
gized eliminating the HEAT MODE in the heat pump.
On−Board Link W915 2 Stage Compr (Y1 to Y2)
On−board link W915 is a clippable connection between ter-
minals Y1 and Y2 on the integrated control. W915 must be
cut if two−stage cooling will be used. If the Y1 to Y2 link is
not cut the outdoor unit will operate in second−stage cooling
only.
Diagnostic LED (Figure 25)
The seven−segment diagnostic LED displays operating
status, target airflow, error codes and other information.
The table beginning on Page 48 lists diagnostic LED
codes.
Diagnostic Push Button (Figure 25)
The diagnostic push button is located adjacent to the
seven−segment diagnostic LED. This button is used to en-
able the Error Code Recall E" mode and the Flame Signal
F" mode. Press the button and hold it to cycle through a
menu of options. Every five seconds a new menu item will
be displayed. When the button is released, the displayed
item will be selected. Once all items in the menu have been
displayed, the menu resumes from the beginning until the
button is released.
Error Code Recall Mode
Select "E" from the menu to access the most recent 10 error
codes. Select c" from the Error Code Recall menu to clear
all error codes. Button must be pressed a second time
while c" is flashing to confirm command to delete codes.
Press the button until a solid ≡" is displayed to exit the Error
Code Recall mode.
Flame Signal Mode
Select "F" from the menu to access the flame signal mode.
The integrated control will display the flame current on 7
segment LED in in micro amps (uA).
Flame signal mode is exited after the following:
D Power is reset
D Pressing and holding push button until 3 horizontal
lines ≡" are displayed
D 10 minutes of entering the flame sense mode.
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