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Operation
Variable Capacity Heat
(40% to 100%)
Three Stage Heat
(40%, 70%, 10%)
Two Stage Heat
(W1 70%, W2 100%)
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
See Figure 56
Switch 1 - Thermostat Selection - This unit may be used
with either a single stage or two stage thermostat. 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 as described in Table 15.
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 15.
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 15.
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 16 provides the blower Off timings that will result
from different switch settings.
507029-05
Thermostat
Switch 1
Two Stage
Single Stage
Single Stage
Table 15.
Blower Off Delay
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.
Switches 8 and 9 - Cooling Mode Blower Speed- The unit
is shipped from the factory with the DIP switches positioned
for high speed (4) indoor blower motor operation during the
cooling mode. The table below provides the cooling mode
blower speeds that will result from different switch settings.
2 - Medium Low
3 - Medium High
4 - High (Factory)
Switches 10 and 11 - Cooling Mode 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
18 provides blower speed adjustments that will result from
different switch settings. Refer to air flow tables for values.
With switches 10 and 11 set to ON, motor will bypass
ramping profiles and all delays and will immediately run
at selected COOLING speed upon a call for cool. LED will
continue to operate as normal. This mode is used to check
motor operation.
Issue 2241
Switch 2
Off
On
On
Off
Off
Off
Switch 4
(Seconds)
60
90 (factory)
120
180
Table 16. Blower Off Delay Switch Settings
Speed
Switch 8
1 - Low
Table 17. Cooling Mode Blower Speeds
Switch 3
Off
2nd stage delay
OFF = 7 minutes
ON = 12 minutes
3rd stage delay
10 minutes fixed
Off
Switch 5
Off
On
Off
Off
On
Off
On
On
Switch 9
On
On
Off
On
On
Off
Off
Off
Page 43 of 73
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