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Reco-Boxx ZXR / ZXA / Flat – Operation and maintenance instructions
[03/
2022 ]
Constant airflow
Flow control involves operating the air handling unit
to keep the preset airflow constant. The speed of
the fans is automatically regulated to provide correct
airflow even if the filters become clogged, diffusers
are blocked, etc. The exhaust air fan is controlled as
a slave. A ratio between exhaust and supply pres-
sure can be configured in order to create over, under
or balanced pressure. For units with backward fans,
constant airflow can only be selected if the “constant
air kit” has been ordered as an option. The desired
setpoint is preset in (l/s, m /h).
Setting
Range
Factory setting
Airflow K1/K2/K3
0...max
Ratio exhaust/supply
5...999 %
100 %
Enable pressure alarm
No
Yes
Yes
∆P Supply/Exhaust
for pressure alarm
25...999 Pa
200 Pa
Initialisation airflow
(l/s, m³/h)
Pressure alarm
initialisation
No
Yes
Yes
Torque control
3 torque setpoints to be configured by the user (%TQ
K1, %TQ K2, %TQ K3). The setpoint is configured in
% of the maximal torque. The exhaust air fan is con-
trolled as a slave. A ratio between exhaust and supply
pressure can be configured in order to create over,
under or balanced pressure. The desired setpoint is
preset in %. The Torque control mode can be deacti-
vated in the advanced setup.
Setting
Range
Factory setting
Airflow K1/K2/K3
0...100 %
Ratio exhaust/supply
5...999 %
100 %
Demand control
The airflow desired is regulated in response to 0-10
V input signals from an external sensor, such as a
carbon dioxide or a humidity sensor. The function
can be configured with a positive or a negative logic.
A ratio between exhaust and supply pressure can be
configured in order to create over, under or balanced
pressure. The desired setpoint is preset in (l/s, m /h).
The “sleep factor” is a lower operating rate for the unit
(due to e.g. low occupancy) that will be activated by
speed “III“.
Setting
Range
Factory setting
Vmin
0...10 V
1,0 V
Vmax
0...10 V
10,0 V
m³/h ~Vmin
(l/s, m³/h)
m³/h ~Vmax
(l/s, m³/h)
Ratio exhaust/supply
5...999 %
100 %
Sleep factor on K3
10...100 %
100 %
Enable pressure alarm
No
Yes
Yes
∆P Supply/Exhaust
for pressure alarm
10...999 Pa
200 Pa
Initialisation airflow
(l/s, m³/h)
Pressure alarm
initialisation
No
Yes
Yes
Constant pressure
The airflow automatically varies to provide constant
pressure in the ducting. The duct pressure is meas-
ured by an external in-duct pressure sensor which is
connected to the control unit’s BUS communication
or the an analogue 0...10V input. The function can
be configured on supply air, extract air or supply and
extract air. The first two configurations will have the
second set of fans be controlled as a slave. A ratio be-
tween exhaust and supply pressure can be configured
in order to create over, under or balanced pressure.
The initialisation will allow for an automatic calculated
pressure setpoint, determined by the nominal airflow.
The “sleep factor” is a lower operating rate for the unit
(due to e.g. low occupancy) that will be activated by
speed “III“.
Setting
Range
Factory setting
Control
Supply
Exhaust
-
Exhaust
Supply
Ratio exhaust/supply
5...999 %
100 %
Sleep factor on K3
10...100 %
100 %
Pressure initialisation
Via Airflow
Via Pressure
Airflow
Start reference
initialisation
Yes
No
Yes
