CIAT AirCompact Control, Control Manual

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13
1.6.5
Fan motors
The motor or motors start when the unit is in "On" mode.
The alarm feedback from the motor(s) is used to check their electronic switching protection. If one or other of these signals is not
received, the unit is stopped and the faults are signalled.
Their rotation speed is controlled using one of the 2 following modes:
1. to maintain the fans at a constant flow ("Flow rate") in accordance with the setpoint(s) on page w0 , based on the
configuration on page p3 of the "Adjustment parameters" menu and the air quality setpoint (option) until the
maximum flow rate limit on page w3 is reached.
2. to maintain a constant pressure in the supply air duct ("Pressure") in accordance with the setpoint on page w1 and
based on the configuration on page p3 of the "Adjustment parameters" menu.
Control modes available for the management of fans
Flow rate Pressure
1.6.6
Filtration
3 different filters can be monitored simultaneously: 1 in the Supply air flow, 1 in the Return air flow and 1 additional filter in either of
the 2 flows.
To check their fouling level, each filter is equipped with a differential pressure sensor which measures its upstream/downstream
pressure drop. This sensor has a measuring range of 0-1250 Pa. In addition to monitoring the fouling level, this sensor also checks
for the presence of an air flow crossing the filter, and therefore the unit, in both directions (Supply and return air). This information
is required for activating the regulation.
For the additional filter, its pressure drop is checked by a pressure switch which will provide information on the saturation level
reached in the controller via a contact.
or
PS
∆
p
Bag filter
∆
p
PS
Gravimetric filter
PS
MS
∆
p
∆
p
PS
MS
Filter
pressure
drop
Dirty filter
detection
threshold
0
Pa
Clogged
filter
detection
threshold