Appendixes Phason
74 2009-06-15
curtain idle
band
Curtain idle band is a temperature buffer around the curtain set point. When the
temperature is within the idle band, the curtains hold their position. When the
temperature is outside the band, the curtains cycle open or closed.
Idle band is one of six curtain settings. For more information, read Programming
curtain control relays
on page 52.
curtain set
point
Curtain set point is the target temperature for the curtains. When the temperature
is between the curtain set point and idle band limits, the curtains hold their
position.
Set point is one of six curtain settings. For more information, read Programming
curtain control relays
on page 52.
differential
The differential temperature is a setting for variable stages. When the temperature
is above the differential temperature setting, the fan runs at full speed.
For more information, read Programming variable stages on page 46.
duty cycle
Duty cycles are a temperature-based style of controlling heating or cooling
elements using ‘on durations’ and ‘off durations’. There are two types of duty
cycles, normal and advanced.
For cooling elements, when the temperature is below the set point, the cooling
element is off. When the temperature rises above the set point, the element
switches on for the ‘on duration’ and then off for the ‘off duration’. If at any time
the temperature drops below the set point, the duty cycle relay switches off and
will not switch on again until the temperature rises above the set point.
For heating elements, when the temperature is above the set point, the heating
element is off. When the temperature drops below the set point, the element
switches on for the ‘on duration’ and then off for the ‘off duration’. If at any time
the temperature rises above the set point, the duty cycle relay switches off and
will not switch on again until the temperature drops below the set point.
Advanced duty cycles are for cooling only. Advanced duty cycles function similar
to normal duty cycles. Instead of having one set point, advanced duty cycles have
two set points.
Set point 1 is the same as the set point in a normal duty cycle. Set point 2 is a set
point that is higher than set point 1. When the temperature is above the set point
2, the duty cycle remains on, regardless of the on/off durations. When the
temperature drops below set point 2, the duty cycle starts again.
For more information, read
Programming heating and cooling elements on page
54.
firmware
The internal program instructions of your PEC Plus.
You can update the firmware version of your PEC Plus to the latest version using
a PEC+ Updater. For more information, read Updating the firmware on page 71.
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