Lennox SLP98DFV - Heating Mode Blower Speed and Control Features; Diagnostic Features

Page 43
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
demand, 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 21 provides the heating mode blower speeds that
will result from different switch settings. Refer to tables
beginning on page 44 for corresponding cfm values.
TABLE 21
Low Heat Blower Speeds
Thermostat
Demand
Blower
Speed
Adjustments
DIP Switch Settings
Low Heat
(R to W1)
14 15 16
+ 15% On Off On
+ 7.5% On Off Off
Normal Off Off Off
- 7.5% On On Off
- 15% On On On
TABLE 22
High Heat Blower Speeds
Thermostat
Demand
Blower Speed
Adjustments
DIP Switch Settings
High Heat
(R to W1 &
W2)
17 18 19
+ 15% On Off On
+ 7.5% On Off Off
Normal Off Off Off
- 7.5% On On Off
- 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 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 24 for operation sequence in appli-
cations including SLP98DFV, a thermostat which features
humidity control and a single-speed outdoor unit. Table 25
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.
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 airow, error codes and other information.
The table on Page 57 lists diagnostic LED codes.
Diagnostic Push Button -- Figure 47
The diagnostic push button is located adjacent to the sev-
en-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 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 ten
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 nd 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.