BLOWER PERFORMANCE SPECIFICATIONS
31
1. Units are shipped without filter(s). CFM in chart is without filter(s).
2. All furnaces shipped with heating speed set at "B" and cooling speed set at "D". Installer should adjust blower speed
as needed. The first task is to determine the proper aiflow for the cooling system.
3. For most cooling applications, about 400 CFM per ton is desirable.
4. The chart is for information only. For satisfactory operation, external static pressure not to exceed value shown on
rating plate.
5. Do not operate above 0.5" w.c. ESP in heating mode. Operating between 0.5" w.c. and 0.8" w.c. is tabulated for cooling
purposes only.
6. * Motor CFM minimum.
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:
Continuous fan speed will be
30%
of the
furnace's maximum airflow capability. If the fur-
nace maximum CFM capaibility is 1760 CFM, the
continuous fan speed will be 0.30 X 1760 CFM =
530 CFM.
Example: If the furnace maximum CFM capaibility
is 1760 CFM, the continuous fan speed will be
0.30 X 1760 CFM = 530 CFM.
Circulator Blower Speed Adjustment Switches
1
2
A
OFF
OFF
B
ON
OFF
C
OFF
ON
D*
ON
ON
Sw itch Bank : S3
Cooling Speed
Taps
DIP Sw itc h No.
(*Indic ates f actory s etting)
3
4
Normal*
OFF
OFF
10%
ON
OFF
-10%
OFF
ON
Normal
ON
ON
Sw itch Bank : S3
A djust Taps
DIP Sw itch No.
(*Indicates f actory setting)
7
8
A
OFF
OFF
B*
ON
OFF
C
OFF
ON
D
ON
ON
Sw itch Bank : S4
Heating Speed
Taps
DIP Sw itch No.
(*Indicates f actory setting)
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.
9
10
DEHUM
Unused
Move to the ON position
to enable dehumidification
ON
OFF
S5
Dehumidification Enable Switch
