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Integrated Control DIP Switch Settings
Conventional Thermostat (non-communicating)
EL297UHV units are equipped with a two-stage, variable
speed integrated control. This control manages ignition
speeds based on selections made using the control dip
switches and jumpers. The control includes an internal
watchguard feature which automatically resets the ignition
control when it has been locked out. After one hour of con-
tinuous thermostat demand for heat, the watchguard will
break and remake thermostat demand to the furnace and
automatically reset the control to relight the furnace.
Note: All communicating settings are set at the commu-
nicating thermostat. See thermosatat installation instruc-
tion. In a communication 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-O Delay -- The blower-on
-
lay (time that the blower operates after the heating de-
switches 3 and 4 on the integrated control. The unit is
-
-
able to satisfy individual applications. Adjust the blower
and 110°F at the exact moment that the blower is de-en-
temperatures; shorter settings provide higher supply air
TABLE 11
Blower O Delay Switch Settings
Blower O Delay
Seconds
Switch 3 Switch 4
60 On
90 (factory)
120 On
180 On On
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 12 provides the cooling
settings. Switches 5 and 6 set the blower cfm for second-
stage cool. The integrated control automatically ramps
Refer to tables for corresponding cfm values. See Product
TABLE 12
Cooling Mode Blower Speeds
Speed Switch 5 Switch 6
Low On On
Medium Low On
Medium High On
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 13 below
provides blower speed adjustments that will result from
blower cfm tables.
TABLE 13
Cooling Blower Speed Adjustment
Adjustment Switch 7 Switch 8
+10% (approx) On
Factory Default
-10% (approx) On
Switches 9 and 10 -- Cooling Mode Blower Speed
Ramping -- Blower speed ramping may be used to en-
-
-
ing mode blower speed ramping options that will result
mode blower speed ramping options are detailed on the
next page.
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