Lennox EL280DF070E36A Unit Information page 13

Integrated Control DIP Switches
EL280DFE units are equipped with a two-stage integrat-
ed control. This control manages ignition timing, heating
mode fan off delays and indoor blower speeds based on
selections made using the control dip switches and jump-
ers. The control includes an internal watchguard feature
which automatically resets the ignition control when it has
been locked out. After one hour of continuous thermostat
demand for heat, the watchguard will break and remake
thermostat demand to the furnace and automatically reset
the control to relight the furnace.
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.
Indoor Blower Operation DIP Switch Settings
Switches 3 and 4 -- Heating Mode 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 switches 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 satisfy individual applications. Adjust the
blower off delay to achieve a supply air temperature be-
tween 90° and 110°F at the exact moment that the blower
is de-energized. Longer off delay settings provide lower
supply air temperatures; shorter settings provide higher
supply air temperatures. TABLE 5 provides the blower off
timings that will result from different switch settings.
Blower Off Heating Mode Delay Switch Settings
Blower Off Delay
Seconds
60
90 (factory)
120
180
Switch 5 -- Cooling Mode Blower-Off Delay-- The unit
is shipped from the factory with the dip switch positioned
OFF for a 45 second delay. TABLE 6 provides the cooling
mode off delay settings.
Blower Off Cooling Mode Delay Switch Settings
Blower Off Delay Seconds
45 (factory)
2
Switches 6 and 7 -- Continuous Fan Mode -- Continu-
ous fan speed can be controlled by changing DIP switch
positions. TABLE 7 provides DIP switch settings for con-
tinuous fan mode.
Continuous Fan Mode Settings
Continuous Fan
Mode
Low Heat Speed
(Factory Setting)
On-Board Link W914 Dehum
On-board link W914, is a clippable connection between
terminals R and DS on the integrated control. W914 must
be cut when the furnace is installed with a thermostat
which features humidity control. If the link is not cut, termi-
nal "DS" will remain energized not allowing the blower to
reduce to low cool speed upon a call for dehumidification.
On-Board Link W951 Heat Pump (R to O)
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 2 Stage Compr (Y1 to Y2)
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 Y1 to Y2 link
is not cut the outdoor unit will operate in second-stage
cooling only.
If any onboard link is cut by mistake, install a jumper
across the corresponding terminals on the low
voltage terminal strip. Do not replace control.
Page 13
TABLE 5
Switch 3
On
Off
Off
On
TABLE 6
Switch 5
TABLE 7
Switch 6
Off
IMPORTANT
Switch 4
Off
Off
On
On
Off
On
Switch 7
Off