Lennox SIGNATURE SLP99UH070XV36B - Page 44

Page 44
Switches 14 through 19 -- Heating Mode Blower Speed
These switches are factory set at the OFF position which
provides 100 % of normal speed during HIGH HEAT de-
mand, 70% of normal speed during MID-RANGE HEAT
demand and 35% of normal speed during LOW HEAT
demand. Switches 14, 15 and 16 are used to adjust the
LOW HEAT blower motor speed. Switches 17, 18 and 19
are used to adjust the HIGH HEAT blower motor speed.
TABLE 22 provides the heating mode blower speeds that
will result from di󰀨erent switch settings. Refer to tables
beginning on page 42 for corresponding cfm values. See
TABLE 24 on page 48 for allowable heating speeds.
TABLE 22
Low Heat Blower Speeds
Thermostat
Demand
Blower
Speed
Adjustments
DIP Switch Settings
Low Heat
(R to W1)
14 15 16
+ 15% On O󰀨 On
+ 7.5% On O󰀨 O󰀨
Normal O󰀨 O󰀨 O󰀨
- 7.5% On On O󰀨
- 15% On On On
TABLE 23
High Heat Blower Speeds
Thermostat
Demand
Blower Speed
Adjustments
DIP Switch Settings
High Heat
(R to W1 &
W2)
17 18 19
+ 15% On O󰀨 On
+ 7.5% On O󰀨 O󰀨
Normal O󰀨 O󰀨 O󰀨
- 7.5% On On O󰀨
- 15% On On On
On-Board Links
On-Board links must be clipped (when applicable) before unit
is placed into operation with a non-communicating thermostat.
On-Board Link W914 DS to R (FIGURE 55)
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 Harmo-
ny III zone control or a thermostat which features humidity
control. If the link is left intact the PMW signal from the
Harmony III control will be blocked and also lead to con-
trol damage. See TABLE 26 on page 48 for operation
sequence in applications including SLP99UHV, a thermo-
stat which features humidity control and a single-speed
outdoor unit. TABLE 27 gives the operation sequence in
applications with a two-speed outdoor unit.
On-Board Link W951 R to O (FIGURE 55)
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 55)
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 55)
The seven-segment diagnostic LED displays operating
status, target airow, error codes and other information.
The table beginning on Page 56 lists diagnostic LED
codes.
Diagnostic Push Button (FIGURE 55)
The diagnostic push button is located adjacent to the
seven-segment 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 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 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. Release the
button and calibration will begin. The furnace will per-
form the high-re and low-re pressure switch calibra-
tions and display “CAL”. After calibration, 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.