20 CVS-21HA.rev.03
STAGE 2 (VARIABLE SPEED FANS)
Minimum speed [% of the full speed of the fans]
- The stage 2 minimum speed is the speed at which
the stage 2 fans start to run and return to a stop.
Bandwidth [°F or °C] - The stage 2 bandwidth is the variation in the room
temperature between the moment the stage 2 fans run at minimum speed
and the moment they reach full speed.
DE-ICING OF STAGE 2 FANS
A de-icing cycle is provided to allow de-icing of stage 2 fans in cold weather
conditions. A cycle is defined to start stage 2 fans periodically. When the
cycle time has elapsed, the stage 1 fans are stopped. The stage 2 fans
are started at full speed and then operated at the stage 2 minimum speed
during a user-defined time. Then, stage 2 fans are turned off and opera-
tion of stage 1 fans is resumed at the appropriate speed.
De-icing Cycle Time [in minutes] - The stage 2 de-icing cycle time is the
time lapse between de-icing operations.
De-icing Time On [in seconds] - The stage 2 de-icing time on is the time
stage 2 fans are turned on during de-icing operations.
STAGE 3 (EITHER CONSTANT SPEED FANS OR
HEATING UNITS)
Differential [°F or °C] - The stage 3 differential is
the variation in the room temperature between the
moment the stage 3 fans or heating units turn on
and the moment they turn off.
Heater offset [°F or °C] - The stage 3 heater offset is the number of
degrees between the set point and the room temperature at which the
stage 3 heating units turn off. When the heater offset is activated, it can be
adjusted to a positive or negative value. When the heater offset is deacti-
vated, it can be adjusted only to a positive value.
HEATER OFFSET
DIFF.
STAGE 3
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