Lennox SLP98UHV Installation Instructions Manual page 41

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 19 provides the heating mode blower speeds that
will result from different switch settings. Refer to tables
beginning on page 42 for corresponding cfm values.
TABLE 19
Low Heat Blower Speeds
Thermostat
Blower
Demand
Speed
Adjustments
+ 15%
+ 7.5%
Low Heat
(R to W1)
Normal
- 7.5%
- 15%
TABLE 20
High Heat Blower Speeds
Thermostat
Blower Speed
Demand
Adjustments
+ 15%
High Heat
+ 7.5%
(R to W1 &
Normal
W2)
- 7.5%
- 15%
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 47)
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 control
damage. Refer to table 21 for operation sequence in appli-
cations including SLP98UHV, a thermostat which features
humidity control and a single-speed outdoor unit. Table 22
gives the operation sequence in applications with a two-
speed outdoor unit.
On-Board Link W951 R to O (Figure 47)
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.
DIP Switch Settings
14 15 16
On Off On
On Off Off
Off Off Off
On On Off
On On On
DIP Switch Settings
17 18 19
On Off On
On Off Off
Off Off Off
On On Off
On On On
On-Board Link W915 Y1 to Y2 (Figure 47)
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 47)
The seven-segment diagnostic LED displays operating
status, target airflow, error codes and other information.
The table beginning on Page 56 lists diagnostic LED
codes.
Diagnostic Push Button (Figure 47)
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 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.
Field Test Mode
Use the diagnostic push button to scroll through the menu
as described above. Release the button when the LED
flashes "-" to select the Field Test mode.
While in the Field Test mode the technician can:
• Initiate furnace ignition and move to and hold low-fire
rate by applying a R to W1 jumper.
• Initiate furnace ignition sequence and move to and hold
high-fire rate by applying a jumper from R to W1 and
W2.
• Initiate furnace ignition sequence and move to and hold
mid-fire rate by applying a jumper to R and W2.
• Apply then remove the jumper from R to W1 and W2 to
change the firing rate from low fire to mid fire and high
fire.
• 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-fire and low-fire pressure switch calibra-
tions and display "CAL". After calibration, the LED will
return to the flashing "-" 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 firing rate, indoor blower CFM and
flame 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.
Page 41