Lennox SL280UHNV Installation Instructions Manual page 34

On-Board Links
Note: In communicating systems with a conventional out-
door unit (non-communicating), the on-board clippable
links must be set to properly configure the system.
WARNINg
Carefully review all configuration information provided.
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
terminals R and DS on the integrated control. W914 must
be cut when the furnace is installed with either the Har-
mony III zone control or a thermostat which features hu-
midity control. If the link is left intact the PMW signal from
the Harmony III control will be blocked and also lead to
control damage. Refer to Table 15 for operation sequence
in applications including SL280UHV, a thermostat which
features humidity control and a single-speed outdoor unit.
Table 16 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
terminals 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 re-
main energized 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
terminals 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 46 lists diagnostic LED
codes.
Diagnostic Push Button (Figure 25)
The diagnostic push button is located adjacent to the sev-
en-segment diagnostic LED. This button is used to enable
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 micro amps (uA).
Flame signal mode is exited after the following:
• Power is reset
• Pressing and holding push button until 3 horizontal
lines "≡" are displayed
• 10 minutes of entering the flame sense mode.
Page 34