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The cooling system manufacturer's instructions must be checked for required air flow. Any electronic air cleaners or other devices
may require specific air flows, consult installation instructions of those devices for requirements.
3. Knowing the furnace model, locate the high stage cooling air flow charts in the Specification Sheet applicable to your model.
Look up the cooling air flow determined in step 2 and find the required cooling speed and adjustment setting.
Example: A *MVC960603B* furnace installed with a 2.5 ton air conditioning system. The air flow needed is 1000 CFM.
Looking at the cooling speed chart for *MVC960603B*, find the air flow closest to 1000 CFM. A cooling airflow of
1007 CFM can be attained by setting the cooling speed to "C".
5. Locate the blower speed selection DIP (S3) switches on the integrated control module. Select the desired "cooling" speed tap
by positioning switches 1 and 2 appropriately. Select the desired "adjust" tap by positioning switches 3 and 4 appropriately. To
enable adjustments and select -5, 5, -10 or 10% trim, you must set dip switch S5-2 to ON. If S5-2 is in the OFF position
, you will receive 0% trim. Refer to the following figure for switch positions and their corresponding taps. Verify CFM by
noting the number displayed on the dual 7-segment LED display.
6. 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 S4- 1, 2. Refer to the
following figure for switch positions and their corresponding taps. Refer to the following
bullet points for a description of each ramping profile. Verify CFM by noting the number
displayed on the dual 7-segment LED display.
•
Profile A
provides only an OFF delay of one (1) minute at 100% of the cooling demand airflow.
•
Profile B
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.
•
Profile C
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.
100% CFM
OFF
ramps up to full cooling demand airflow by first stepping up to 50% of the full
50% CFM
OFF
1/2 min
ramps up to 85% of the full cooling demand airflow and operates there for
OFF
100% CFM
1 min
Figure 50
100% CFM
100% CFM
1 min
Figure 51
100% CFM
Figure 52
40
Sw itch Bank: S4
DIP Sw itch No.
Ramping
Profiles
1
A*
OFF
B
ON
C
OFF
D
ON
(*Indicates factory setting)
OFF
OFF
OFF
2
OFF
OFF
ON
ON
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Troubleshooting
