VALLOX DIGIT SE / VKL
VALLOX DIGIT SE VKL part list
Voltage values for each fan speed:
0
0.20...1.25 VDC
1
1.75...2.25 VDC
2
2.75...3.25 VDC
3
3.75...4.25 VDC
4
4.75...5.25 VDC
5
5.75...6.25
VDC
6
6.75...7.25 VDC
7
7.75...8.25 VDC
8
8.75...10.00 VDC
Current values for each fan speed:
0
0.5...2.5 mA
1
3.5...4.5 mA
2
5.5...6.5
mA
3
7.5...8.5 mA
4
9.5...10.5 mA
5
11.5...12.5 mA
6
13.5...14.5 mA
7
15.5..16.5 mA
8
17.5...20.0 mA
Voltage and current signal values (selection in the motherboard)
Control of operation
Power supply to the unit can be controlled with a contactor in the distribution
panel if needed, e.g. with a timer programme. After starting, the unit first
operates at basic fan speed. After that power is adjusted based either on the
measurement data from air quality sensors and/or on manual control at the
control panel.
Fan speed adjustment
Manual control
Fan speed of the ventilation unit is controlled in 8 steps at control panel
H
.
Week clock control
Fan speed of the ventilation unit is controlled in 8 steps using the week clock
in control panel
H
. The week clock can be used to programme the desired fan
power option and the setpoint for supply air temperature for each day of the
week and each hour in the day.
Carbon dioxide and humidity control
The fan capacity of the ventilation unit is controlled in multiple steps
depending on loads, and based on the measurement results of the air quality
sensors (CO
2
and %RH sensors) located in the ventilation zone. The aim is to
keep carbon dioxide and/or humidity content below the threshold set at
control panel
H
. You may also choose automatic search for thehumidity
content threshold on the control panel
H
. One or more modes of control may
be used simultaneously - the mode demanding boosting is the dominant one.
Fan speed varies depending on load between the basic and maximum fan
speeds. The basic and maximum fan speeds can be set at the desired level at
the control panel
H
.
Control through voltage or current signal
The fan power of the ventilation unit is controlled in 8 steps with a voltage
signal of 0...10 VDC, or with a current signal of 0...20 mA. However, fan
power cannot be raised above the set maximum fan speed. Voltage or
current signal control is used to control basic fan speed. Because of this, fan
speed can only be raised when necessary, but not lowered by the manual,
CO
2
and %RH controls.
15
DESCRIPTION OF OPERATION DIGIT SE VKL, water radiator
Supply air temperature
Supply air temperature can be controlled using either constant temperature
adjustment or cascade adjustment.
Supply air constant temperature control
The control unit directs the operation of the control valve
SV
on the basis ofthe
measuring data on the temperature sensor
TE2
. The aim is to keepsupply air
temperature at the temperature value set on the control panel H
(+10...+30
°
C).
Supply air cascade control
The control unit directs the operation of the control valve
SV
on the basis ofthe
measuring data on the extract air sensor
TE4
. The aim is to keepextract air
temperature at the temperature value set on the control panel
H
(+10...+30
°
C).
Heat recovery bypass
When post-heating has been switched on, heat recovery is enabled all
thetime. Automatic heat recovery bypass is active whenever post-heating
hasbeen switched off and outdoor temperature exceeds the preset
threshold(range 0…+25
°
C). In this case, the control unit directs the operation
ofthe damper motor
FG
on the basis of measuring results given by theoutdoor
sensor
TE3
and the extract air temperature sensor
TE4
. The aim isto get as cool
supply air to the ventilation zone as possible. The indicationof a freezing risk
appears in the display of the control panel. Heatrecovery is, however, on
whenever outdoor temperature is below the limitset, or whenever outdoor air is
warmer than extract air.
Heat recovery anti-freezing
Active when outdoor temperature is below 0
°
C. The control/adjustment center
of the unit directs the operation of the preheater
LP1
on the basis of the
measurement data supplied by the temperature sensors
TE1
and
TE3
. The aim is
to prevent the risk of freezing and the stopping of the supply air fan
TF
. If the
capacity of the preheater
LP1
is not sufficient, or if there is no preheater, the
control center intermittently stops the
TF
supply air fan on the basis of the
measuring data on the temperature sensors
TE1
and
TE3
, thereby preventing
the heat recovery cell from freezing. As soon as the risk of frosting passes,
the fan restarts automatically. The threshold temperature for defrosting (-
6…+15
°
C) and the difference area (+1…+10
°
C) can be set on the control
panel
H
. When the fan
TF
stops, power supply to the
LP1
radiator stops and
the actuator valve
V1
of the
LP2
post-heating radiator starts to open or
remains open.
Antifreeze protection of the water radiator
Based on the measurement data in outdoor temperature sensor
TE3
(outdoor
air <0
°
C) and supply air temperature sensor
TE2
(supply air <7
°
C) the
control centre of the unit stops fans
TF
and
PF
. Moreover, valve V1 remains
open and self-actuated dampers
SP
of the fans close. This decreases the
freezing risk in the water circulating heating unit
LP2
. A freezing alert
appears in the display of the control panel. The fans restart automatically as
soon as the risk of freezing passes (supply air > 10
°
C).
Alarms
The pressure difference switches
PDS1
and
PDS2
monitor the pressure
difference between the supply and extract air sides. If the pressure difference
rises too high because of dirty filters or clogged ducts, an alarm will be
issued. This is indicated by a symbol ( ) in the main display of the control
panel. If the unit is not equipped with pressure difference switches, the
symbol ( ) appearing in the main display of the control panel reminds of the
need of servicing the unit. The reminder interval can be set between 1...15
months. The factory setting is 4 months. This function is always active. The
fault signal relay in the unit gives potential-free alarm indications on the
following fault conditions:
• when the defrost function of the water-circulated radiator is on, the points
of the relay close and open at a 10-second interval.
• alarm of high carbon dioxide content (>5000 ppm ) switches the relay at
1-second intervals.
• in other fault situations, such as a sensor fault ( ) and a filter guard alarm,
the points of the relay close.
Booster or fireplace switch function
The booster or fireplace switch function of the ventilation unit is controlled
either at control panel
H
and/or separate switch
S
, which can be connected
to the connection box of the unit. The mode of operation of the switch is
selected at control panel
H
. The booster switch function raises fan speed to
the set maximum fan speed for 45 minutes. The fireplace switch stops the
extract air fan for 15 minutes and produces overpressure in the ventilation
zone.
LON remote monitoring control can be implemented with the VALLOX LON converter.
SP
Damper 2 pcs
Air flow operated
Standard
