PEC Plus user manual Programming the stages
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Programming actuators
Before programming the actuator relays, make sure you have properly configured the relays and
calibrated the actuators. For more information, read Configuring relays for actuators on page 34
and Calibrating actuators on page 35.
Each actuator has six stages. The settings for the stages include the set point temperature, position,
and differential temperature.
How actuators work
When the temperature is below the minimum set point, the actuator is closed.
When the temperature rises to the minimum set point, the actuator moves to the minimum
position.
As the temperature rises, the actuator moves through the stages until it reaches its maximum
open position. This method lets you gradually open inlets instead of fully opening them when
the temperature rises above a single set point.
0% 100%
Temperature
ctuator position
Stage 0 set point
(min. set point)
Stage 1 set point
Stage 1 differential
Stage 2 set point
Stage 2 differential
Stage 3 set point
Stage 3 differential
Stage 4 set point
Stage 4 differential
Stage 4
position
Stage 2
position
Stage 1
position
Stage 0 position
(minimum
position)
Stage 3
position
Stage 5 set point
Stage 5 differential
Stage 5
position
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