BLOWER PERFORMANCE SPECIFICATIONS
Ramping Profile
Note: The
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
Switch Bank: S4
Ramping | DIP Switch No. | |
Profiles | 5 | 6 |
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A* | OFF | OFF |
B | ON | OFF |
C | OFF | ON |
D | ON | ON |
(*Indicates factory setting)
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| 100% CFM |
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| 100% CFM |
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OFF |
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1 min
Profile A: provides only an OFF delay of one (1) minute at 100% of the cooling demand airflow.
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| 100% CFM |
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OFF |
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| 50% CFM |
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| 1/2 min |
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| 1 min |
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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.
OFF
100% CFM
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.
OFF
OFF
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.
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.
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