RT-SVD03G-EN 11 5
Electromechanical Economizer (3 Position Damper)
Full open economizer minimum position is accomplished by setting the ECA 50% minimum
position potentiometer to 100% and installing a set of contacts in series with the existing 130 ohm
resistor to terminals P and P1 on the ECA.
Any intermediate (0 - 50%) economizer position is accomplished by installing a 0 - 270 ohm
potentiometer in series with an additional set of contacts and the existing 130 ohm resistor to
terminals P and P1 on the ECA. 0 ohms = 50% outside air and 270 ohms = 0% outside air.
Fully closed position is accomplished when the indoor fan is disabled.
Note: Actual outside airflow is also dependent on return air static pressure.
Figure 67. Electromechanical Economizer
Set pot at
100%
130 ohm resistor shipped
with the economizer and
connected from P to PI
from the factory.
0-270 ohm
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