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Integrated Control DIP Switch Settings
A97UH2E & 97G2UHE 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 jumpers. 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.
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 determine
the second stage on delay when a single-stage thermostat
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
Page 44 of 60
and is adjustable 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 temperatures; shorter settings provide higher
supply air temperatures. Table 10 provides the blower off
timings that will result from different switch settings.
Blower Off Delay
(Seconds)
60
90 (Factory)
120
180
Table 10. Blower Off Heating Mode Delay Switch
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 11 provides the cooling
mode off delay settings.
Blower Off Delay
(Seconds)
45 (Factory)
2
Table 11. Blower Off Cooling Mode Delay Switch
Switches 6 and 7 -- Continuous Fan Mode -- Continuous
fan speed can be controlled by changing DIP switch
positions. Table 12 provides DIP switch settings for
continuous fan mode.
Continuous Fan Mode
Low Heat Speed (factory)
Table 12. Continuous Fan Mode Settings
Switch 8 - DIP Switch 8 is not powered and not used.
Switching from on/off will not change any output.
Issue 2327
Switch 3
Switch 4
On
Off
Off
On
Settings
Switch 5
Off
On
Settings
Switch 6
Switch 7
Off
Off
Off
On
On
Off
508390-01
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