User manual
Chapter 4: Programming your SEC-HD Phason
30
Programming variable stages, parameters 2 to 9
There are four settings to program for each variable stage. The following diagram explains how the
settings work together. For a more-detailed description of how all settings work together, read
Understanding how the SEC-HD operates on page 26.
When the temperature is below the
Idle range, the fan is off.
When the temperature reaches the
Idle range, the fan runs at full speed for three seconds and
then runs at the Idle speed. The fan continues to run at the Idle speed until the temperature
rises to the Set point.
When the temperature is between the Set point and
Differential, fan speed increases or decreases
proportionally with the temperature.
When the temperature is at or above the
Differential, the fan runs at full speed.
Use the Variable stage settings worksheet on page 57 when programming variable
stages.
Fan speed
Fan speed increases as the temperature rises, or decreases
as the temperature falls.
The fan runs at Idle speed. The temperature band between
the
Idle range temperature and the Set point
is sometimes
called the “idle band”.
The fan is off when the temperature is below the
temperature.
The fan runs at full speed.
Differential
temperature
Idle range
temperature
Idle speed
Set point
temperature
Temperature