Lennox SLP99DFV Series User Manual

Page 17
On-Board Link W914 DS to R (FIGURE 4)
On-board link W914, is a clippable connection between
terminals DS and R 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 PWM 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 SLP99UHV, a thermostat which
features humidity control and a single-speed outdoor unit.
Table 16 gives the operation sequence in applications with
a twospeed outdoor unit.
On-Board Link W951 R to O (FIGURE 4)
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 Y1 to Y2 (FIGURE 4)
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 link is not cut
the outdoor unit will operate in second-stage cooling only.
Diagnostic LED (FIGURE 4)
The seven-segment diagnostic LED displays operating
status, target airow, error codes and other information.
Table 14 lists diagnostic LED codes.
Diagnostic Push Button (FIGURE 4)
The diagnostic push button is located adjacent to the sev-
ensegment diagnostic LED. This button is used to enable
the Error Code Recall mode and the Field Test mode.
Press the button and hold it to cycle through a menu of
options. Every ve seconds a new menu item will be dis-
played. 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 ashing to conrm command to delete
codes. Press the button until a solid “≡” is displayed to exit
the Error Code Recall mode.
Field Test Mode
Use the diagnostic push button to scroll through the menu
as described above. Release the button when the LED
ashes “-” to select the Field Test mode.
While in the Field Test mode the technician can:
• Initiate furnace ignition and move to and hold low-
re rate by applying a R to W1 jumper.
• Initiate furnace ignition sequence and move to and
hold high-re rate by applying a jumper from R to
W1 and W2.
• Initiate furnace ignition sequence and move to and
hold mid-re rate by applying a jumper to R and
W2.
• Apply then remove the jumper from R to W1 and
W2 to change the ring rate from low re to mid re
and high re.
• A vent calibration sequence can be initiated even if
a thermostat signal is not present. Press and hold
the push button until a solid “C” is displayed. Re-
lease the button and calibration will begin. The fur-
nace will perform the high-re and low-re pressure
switch calibrations and display “CAL”. After calibra-
tion, the LED will return to the ashing “-” display.
During Field Test mode operation, all safety switches are
still in the circuit (they are not by-passed) and indoor blow-
er performance and timings will match DIP switch selec-
tions. Current furnace ring rate, indoor blower CFM and
ame signal will be displayed. To exit the Field Test mode,
press and hold the button. The menu will resume from the
beginning. Also, cycle the main power to exit the Field Test
mode. The integrated control will automatically exit the
Field Test mode after 45 minutes of operation.
Soft Disable
Soft disabling is when thermostat nds a device on the
BUS that it does not recognize and the thermostat sends
a the device a message to be in soft disabling mode until
properly congured. Two horizontal bars will display.
Steps to follow if the damper control module is displaying
the soft disable code.
1 - Conrm proper wiring between all devices
(thermostat, damper control module, indoor and
outdoor).
2 - Cycle power to the control that is displaying the soft
disable code.
3 - Put the room thermostat through set up.
4 - Go to setup / system devices / thermostat / edit
/ then push reset.
5 - Go to setup / system devices / thermostat / edit /
then push resetAll.

Lennox SLP99DFV Series Specifications

General

Brand	Lennox
Model	SLP99DFV Series
Category	Furnace
Language	English