Lennox Allied Air A96UHMV, Installation Instructions Manual

Page: 35 / 66

506550-01 Page 35 of 66 Issue 1230
These units are equipped with an integrated control. This
control manages ignition timing, combustion air inducer
speed, heating mode fan OFF delays and indoor blower
speeds based on selections made using the control DIP
switches and onboard links. The control includes an internal
feature which automatically resets the ignition control when
it has been locked out.
NOTE: All DIP switches are factory shipped in the “OFF”
position.
Heating Operation DIP Switch Settings - Figure 41
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
DIIP switch must be repositioned. See Table 12.
Switch 2 - Operating Mode with Two Stage Thermostat
If a two stage thermostat is used, the furnace can operate in
either variable capacity or conventional two stage mode.
When variable capacity mode is selected, the firing rate of
the unit is varied to maximize comfort. Conventional two
stage mode is the factory default setting. See Table 12.
Switch 3 - Second Stage Heat On Delay - If a single stage
thermostat is used, the integrated control can be used to
energize second stage heat after either 7 minutes or 12
minutes of first stage heat operation. See Table 12.
Switches 4 and 5 - 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 4 and 5 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 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 13 provides
the blower Off timings that will result from different switch
settings.
Blower Off Delay Switch Settings
Table 13
Indoor Blower Operation DIP Switch Settings
Switches 6 and 7 - Continuous Indoor Fan Operation -
Blower Speed -
The unit is shipped from the factory with
the DIP switches positioned for medium low (38%) speed
during continuous indoor blower operation. Continuous fan
setting is 38% of cool setting and is not adjustable.
Thermostat Selection Switch Settings
Table 12