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BLOWER PERFORMANCE SPECIFICATIONS
Circulator Blower Speed Adjustment Switches
Switch Bank
Heating Off Delay
S1
Thermostat Setup
Cooling Airflow
S3
Ramping Profile
S4
Heating Airflow
S5
Continuous Fan
Note: There are dual 7-segment LED's adjacent to the selection dipswitches. The airflow (rounded to the nearest 100 CFM) is
displayed on the dual 7-segment LED's. The CFM display alternates with the operating mode.
Example:
If the airlfow demand is 1230 CFM, the LED's will display 12. If the airflow demand is 1275 CFM, the LED's will display 13.
Note: The optional usage of a dehumidistat allows the furnace's circulator blower to operate at a slightly lower speed (85% of
desired speed) during a combined thermostat call for cooling and dehumidistat call for dehumidification. This can be done
through an independent dehumidistat or through a thermostat's DEHUM terminal (if available). This lower blower speed enhances
dehumidification of the conditioned air as it passes through the AC coil. For proper function, a dehumidistat applied to this furnace
must operate on 24 VAC and utilize a switch which opens on humidity rise.
1.
All furnaces ship as high speed for cooling. Installer must adjust blower speed as needed.
2.
For most jobs, about 400 CFM per ton when cooling is desirable.
3.
Do not operate above .5" w.c. ESP in heating mode. Operating CFM between .5" and .8" w.c. is tabulated for cooling purposes only.
4.
Continuous fan speeds of 25%, 50%, 75% of maximum cooling airflow are available when using a communicating thermostat and 25%, 50%, 75%, 100%
of maximum cooling airflow are available in legacy mode by setting dip switches
Purpose
Function
2 Stage Stat
2 Stage Stat
1 Stg Stat 5 min delay
1 Stg Stat auto delay
Add 5%
Minus 5%
Trim
Add 10%
Minus 10%
Disabled
Dehum
Enabled
Disabled
Trim
Enabled
100%
1
90
Off
120
On
150
Off
180
On
A
Off
B
On
C
Off
D
On
A
Off
B
On
C
Off
D
On
A
B
C
D
Off
On
25%
50%
75%
Dip Switch
2
3
Off
Off
On
On
On
On
On
Off
Off
Off
Off
On
Off
Off
On
On
Off
Off
On
Off
Off
On
On
On
Off
Off
On
On
Off
Off
On
Off
Off
On
On
On
Off
On
Off
Off
On
Off
Off
On
On
On
4
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