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Integrated Control DIP Switches
EL280DFE units are equipped with a two-stage integrated
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 application.
The DIP switch is factory-positioned for use with a two-
stage thermostat. If a single-stage thermostat is to be used,
the DIP switch must be repositioned.
a-a -
Select “OFF
” for two-stage heating operation con
trolled by a two-stage heating thermostat (factory set
ting);
b -
Select “ON
” for two-stage heating operation con
trolled by a single-stage heating thermostat. This set
ting provides a timed delay before second-stage heat
is initiated.
Switch 2 a --- 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 se
conds. The blower off delay affects comfort and is adjust
able to satisfy individual applications. Adjust 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.
Longer off delay settings provide lower supply air tempera
tures; shorter settings provide higher supply air temperatu
res.Table 5 provides the blower off timings that will result
from different switch settings.
TABLE 5
Blower Off Heating Mode Delay Switch Settings
Blower Off Delay
(Seconds)
Switch 3
Switch 4
60
On
Off
90 (Factory)
Off
Off
120
Off
On
180
On
On
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.
TABLE 6
Blower Off Cooling Mode Delay Switch Settings
Blower Off Delay
(Seconds)
Switch 5
45 (Factory)
Off
2
On
Switches 6 and 7 -- Continuous Fan Mode --
Continuous
fan speed can be controlled by changing DIP switch posi
tions. Table 7 below provides DIP switch settings for contin
uous fan mode.
TABLE 7
Continuous Fan Mode Settings
Continuous Fan
Mode
Switch 6
Switch 7
Low Heat Speed
(factory)
Off
Off
Low Cool Speed
Off
On
High High Speed
On
Off
High Cool Speed
On
On
Onboard Links
W914 Dehum
Onboard link W914, is a clippable connection between ter
minals 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, terminal “DS'
will remain energized not allowing the blower to reduce to
low cool speed upon a call for dehumidification.
W951 Heat Pump (R to O)
Onboard link W951 is a clippable connection between ter
minals 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 remain ener
gized eliminating the HEAT MODE in the heat pump.
W915 2 Stage Compr (Y1 to Y2)
Onboard link W915 is a clippable connection between ter
minals 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 cool
ing only.
