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31-5000723 Rev. 0
Operation
Thermostat
Switch 1
Switch 2
Switch 3
Variable Capacity Heat
(40% to 100%)
Two-Stage
Off
On
Off
Three-Stage Heat
(40%, 70%, 100%)
Single-Stage
On
Off
2nd Stage Delay
OF = 7 minutes
ON = 12 minutes
3rd Stage Delay
10 minutes fixed
Two-Stage Heat
(W1 70%, W2 100%)
Two-Stage
Off
Off
Off
Table 3. Thermostat Selection Switch Settings
Heating Operation DIP Switch Settings -- Figure 4
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. See Table 3.
NOTE:
All DIP switches are factory shipped in the “OFF”
position.
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
twostage mode is the factory default setting. See Table 3.
Switch 3 -- Second-Stage Heat On Delay --
If a singlestage
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 3.
Switches 4 and 5 -- Blower-Off Delay --
The blower-on
delay of 45 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 4 provides
the blower off timings that will result from different switch
settings.
Blower Off Delay
(Seconds)
Switch 4
Switch 5
60
Off
On
90 (Factory)
Off
Off
120
On
Off
180
On
On
Table 4.
Blower Off Delay 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 --
Switches 8 and 9 are used to select cooling blower motor
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. Table 5 provides the
cooling mode blower speeds that will result from different
switch settings. Refer to blower tables at the front of this
manual for corresponding cfm values.
Speed
Switch 8
Switch 9
1 - Low
On
On
2 - Medium Low
Off
On
3 - Medium High
On
Off
4 - High (Factory)
Off
Off
Table 5. Cooling Mode Blower Speeds
Switches 10 and 11 -- Cooling Mode Blower Speed
Adjustment --
Switches 10 and 11 are used to select
blower speed adjustment settings. 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 6 provides blower speed adjustments
that will result from different switch settings. Refer to blower
tables at the front of this manual for corresponding cfm
values. With switches 10 and 11 set to ON, motor will bypass
ramping profiles and all delays and immediately upon a call
for cool, run at COOLING speed selected. LED will continue
