S&P UTBS PRO-REG Series, Manual

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11.3. OPERATION FAN MODES
The Pro-Reg units can operate in 3 operating modes:
CAV: Operation at constant fl ow
VAV: Operation at variable fl ow
COP: operation at constant pressure
11.3.1. Constant airfl ow operation (CAV)
Mode recommended in installations where it is necessary to maintain a constant
airfl ow.
The speed of the fans is defi ned to correspond to a precise airfl ow and to keep it
constant.
The fan fl ow is controlled by a pressure transmitter integrated into the equipment
in all versions.
The controller performs the conversion of the signal received from the pressure
transmitter to fl ow, using the relation
. This parameter K depends on the fan
construction and is different for each model.
In case CAV mode is selected, in the Main screen it is showed the actual m
3
/h of the
fans with pressure transmitters and also a percentage of the maximum fan speed
(Note that the unit has already been confi gured at the factory, so it is not necessary
to make these adjustments except when replacing the controller or reset it):
In order to obtain the actual fl ow, the parameter K has to be defi ned.
Factory settings
Model K Factor Pressure
sensor
Pressure
sensor
(Air fl ow)
Slave fan
factor
Number
of fans
UTBS-2 69 2500 Pa 3000 Pa 100% 1
UTBS-3 84 2500 Pa 3000 Pa 100% 1
UTBS-5 84 2500 Pa 3000 Pa 100% 2
UTBS-8 104 2500 Pa 3000 Pa 100% 2