User manual

Appendices Phason
50
hysteresis
The number of degrees above the set point that a heating stage or relay
switches off, and the number of degrees below the set point that a cooling
stage or relay switches off.
For example, a household thermostat might switch on a furnace at 68 °F
when the house is cooling down, but switch it off at 72 °F when the house is
warming up. The difference between these two values is the hysteresis.
For more information, read Configuring hysteresis, parameter 18 on page
25.
idle range
The temperature setting below which a variable stage's fan is off and the inlet
is closed. When the temperature is between the idle range and set point, the
fan operates at idle speed and the inlet is open the corresponding amount.
For more information, read Programming variable stages, parameters 2 to 9
on page 33.
idle speed
The percentage of full power at which a variable speed fan operates for
minimum ventilation.
For more information, read Programming variable stages, parameters 2 to 9
on page 33.
minimum
duration
The minimum amount of time an alarm condition must be present before the
TVS signals an alarm. The minimum duration (one minute) prevents alarms
from activating when the temperature rises or drops for just a few seconds.
For more information, read Programming alarm settings, parameters 11, on
page 35.
minimum idle
See idle speed.
relay
An electromagnetic switch that is either on (closed) or off (open).
set point
For variable stages, the temperature above which fan speed increases toward
its maximum. For more information, read Programming variable stages,
parameters 2 to 9
on page 33.
For relay stages, the temperature at which the stage switches between the
OFF and ON state. For more information, read Programming the relay
stage, parameter 10
on page 27.
spikes
Short-term deviations or changes from a desired voltage level or signal. These
deviations can cause damage to electronic devices, or cause them to
malfunction. Spikes are often caused by sudden excess power, also known as
‘power surges’, or by drops in power, knows as ‘brown outs’.
For more information, read Understanding power surges and surge
suppression
on page 9.