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EXPERT LA
6.2
Fan Stages
6.2.1
Principle of Operation
The controller has 12 fan stages which operate in
a sequence to increase the level of ventilation as
the room temperature increases. Each stage can
activate on/off outputs and a combination of timer
relays for cooling purposes. A fan stage is acti-
vated when the room temperature reaches its start
temperature and is disabled when the room tem-
perature decreases to its stop temperature.
Start temperatures of fan stages are defined with
respect to the set point and with respect to each
other. This means that when one of these values is
VENTILATION
LEVEL
STAGE Y
STAGE X
40
EXPERT LA rev.00
Operating Diagram
of Fan Stages
adjusted, all the consecutive values are adjusted
by the same amount. For example, if the set point
is increased by 1°F, the start temperature of all
fan stages will be increased by the same amount.
Timer-based relays in fan stages
Fan stages can activate relays that operate fol-
lowing a timer (On and Off Times). This is useful to
activate misting units in timer mode while a spe-
cific fan stage is active. Refer to section 4.8 to
enable timer-based relays.
ROOM T°
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