BLOWER PERFORMANCE SPECIFICATIONS
32
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.
Ramping Profile
Note:
The multi-speed circulator blower also offers several custom ON/OFF ramping profiles. These profiles may be used
to enhance cooling performance and increase comfort level. The ramping profiles are selected using DIP switches 5 and
6. Refer to the following figure for switch positions and their corresponding taps. Refer to the bullet points below for a
description of each ramping profile. Verify CFM by noting the number displayed on the dual 7-segment LED display.
5
6
A*
OFF
OFF
B
ON
OFF
C
OFF
ON
D
ON
ON
Switch Bank: S4
DIP Switch No.
(*Indic ates factory setting)
Ramping
Profiles
OFF
100% CFM
100% CFM
1 min
OFF
Profile A:
provides only an OFF delay of one (1) minute at
100% of the cooling demand airflow.
50% CFM
1/2 min
100% CFM
100% CFM
1 min
OFF
OFF
Profile B:
ramps up to full cooling demand airflow by first
stepping up to 50% of the full demand for 30 seconds. The
motor then ramps to 100% of the required airflow. A one (1)
minute OFF delay at 100% of the cooling airflow is provided.
100% CFM
OFF
OFF
Profile C:
ramps up to 82% of the full cooling demand airflow
and operates there for approximately 7 1/2 minutes. The motor
then steps up to the full demand airflow. Profile C also has a
one (1) minute 100% OFF delay.
Profile D:
ramps up to 50% of the demand for 1/2 minute,
then ramps to 82% of the full cooling demand airflow and
operates there for approximately 7 1/2 minutes. The motor
then steps up to the full demand airflow. Profile D has a 1/2
minute at 50% airflow OFF delay.
OFF
OFF
