Lennox SL280DFNV Series Unit Information page 16

Code Diagnostic Codes/Status of Equipment
E406 LSOM - Compressor open start circuit.
E407 LSOM - Compressor open run circuit.
E408 LSOM - Compressor contactor is welded.
E409 LSOM - Compressor low voltage.
DIP Switch Settings
NOTE - All communicating settings are set at the commu-
nicating thermostat. See thermostat installation instruc-
tion. In a communicating system all DIP switch and clippa-
ble link settings are ignored. For conventional thermostats
proceed with DIP switch and clippable link settings as out-
lined in the following.
Heating Operation DIP Switch Settings
Switch 1 -- Thermostat Selection -- This unit may be
used with either a single-stage or two-stage thermostat.
The thermostat selection is made using a DIP switch
which must be properly positioned for the particular appli-
cation. The DIP switch is factory-positioned for use with a
twostage thermostat. If a single-stage thermostat is to be
used, the DIP switch must be repositioned.
a. Select "OFF" for two-stage heating operation controlled by a
two-stage heating thermostat (factory setting);
b. Select "ON" for two-stage heating operation controlled by
a single-stage heating thermostat. This setting provides a
timed delay before second-stage heat is initiated.
Switch 2 -- Second Stage Delay (Used with Single-
Stage Thermostat Only) -- This switch is used to deter-
mine the second stage on delay when a single-stage ther-
mostat is being used. The switch is factory-set in the OFF
position, which provides a 7-minute delay before second-
stage heat is initiated. If the switch is toggled to the ON
position, it will provide a 12-minute delay before second-
stage heat is initiated. This switch is only activated when
the thermostat selector jumper is positioned for SINGLE-
stage thermostat use.
Switches 3 and 4 -- Blower-Off Delay -- The blower-on
delay of 30 seconds is not adjustable. The blower-off delay
(time that the blower operates after the heating demand
has been satisfied) can be adjusted by moving switch-
es 3 and 4 on the integrated control. The unit is shipped
from the factory with a blower-off delay of 90 seconds.
The blower off delay affects comfort and is adjustable to
atisfy individual applicationsAdjust the blower off delay to
achieve a supply air temperature between 90° and 110°F
at the exact moment that the blower is de-energized. Lon-
ger off delay settings provide lower supply air tempera-
tures; shorter settings provide higher supply air tempera-
tures. TABLE 6 provides the blower off timings that will
result from different switch settings.
TABLE 5 Continued
Action Required to Clear and Recover
Required amount of current is not passing through Start cur-
rent transformer. Clears the error after current is sensed in
START sensor, or after power reset.
Required amount of current is not passing through Run current
transformer. Clears the error after current is sensed in RUN
sensor, or 1 normal compressor run cycle, or after power reset.
Compressor runs continuously. Clears the error after 1 normal
compressor run cycle or after power reset.
Secondary voltage is below 18VAC. After 10 minutes, oper-
ation is discontinued. Clears the code after voltage is higher
than 20 VAC for 2 seconds or after power reset.
Blower Off Delay
Seconds
60
90 (factory)
120
180
Indoor Blower Operation DIP Switch Settings
Switches 5 and 6 -- Cooling Mode Blower Speed -- The
unit is shipped from the factory with the dip switches po-
sitioned for high speed (4) indoor blower motor operation
during the cooling mode. TABLE 7 provides the cooling
mode blower speeds that will result from different switch
settings. Switches 5 and 6 set the blower cfm for second-
stage cool. The integrated control automatically ramps
down to 70% of the second-stage cfm for first-stage cfm.
Refer to tables for corresponding cfm values.
Speed
Low
Medium Low
Medium High
High (factory)
Switches 7 and 8 -- Cooling Blower Speed Adjustment
-- The unit is shipped from the factory with the dip switches
positioned for NORMAL (no) adjustment. The dip switches
may be positioned to adjust the blower speed by +10%
or -10% to better suit the application. TABLE 8 provides
blower speed adjustments that will result from different
switch settings. Refer to tables for corresponding cfm val-
ues.
Page 16
TABLE 6
Blower Off Delay Switch Settings
Switch 3
On
Off
Off
On
TABLE 7
Cooling Mode Blower Speeds
Switch 5
On
Off
On
Off
Switch 4
Off
Off
On
On
Switch 6
On
On
Off
Off