I-1. Testing Rotation: Single Fan
Press the increase button until the CPC-3 display shows that the fan is running at 50% speed and verify that the
Actual Pressure on the CPC-3 display becomes more negative as the fan speed increases when testing Draft
applications or more positive as the fan speed increases when testing Combustion Air applications.
Wait up to 90 seconds for Actual Pressure to stabilize.
IMPOR
TANT
If the Actual Pressure DOES NOT become more negative as the fan speed increases toward the 50% speed when
testing Draft applications or more positive when testing Combustion Air applications, continue to Section X-4 on
page 11.
If the Actual Pressure DOES become more negative for Draft applications or most positive for Combustion Air
applications as the fan speed increases, continue.
Record the Actual Pressure
Top Line Reads:
(Disregard if system is for Combustion Air only)
Second from Top Line Reads:
(Disregard if system is for Draft only)
J-1. Dip Switch Adjustment for Proper Fan Rotation
(1) Identify the set of Dip Switches which correspond to the application for which this system
is set up.
If the system is for Draft applications, the following configurations should be made to the set of Dip Switches on the
left side of the CPC-3.
If the system is for Combustion Air applications, the following configurations should be made to the set of Dip
Switches on the right side of the CPC-3.
Operation
Mode
Set
Point
Actual
Pressure
% Speed
Operation
Mode
Set
Point
Actual
Pressure
% Speed
6
Note: The above numbers have no meaning in regards to these steps--
they are merely placeholders. Your numbers do not need to match these.
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