Vallox Digit 2 SE Series User manual

DIGIT2 SE R
DIGIT2 SE L
DIGIT2 SE VKL R
DIGIT2 SE VKL L
DIGIT2 SE MLV VKL R
DIGIT2 SE MLV MLV L
DIGIT2 SE MLV electric R
DIGIT2 SE MLV electric L
Models:
© VALLOX • We reserve the right to make changes without prior notification.
TECHNICAL SPECIFICATION
• 1.09.391E
• 11.2.2011
• Code 3550 SE
© VALLOX
Electrical connection 230 V, 50 Hz
Class of protection IP34
Fans Extract air 210 kW 0.91 A (AC) 120 dm3/s (120 Pa)
Supply air 210 W, 0.91 A (AC) 110 dm3/s (100 Pa)
Heat recovery Cross-flow cell, ␩> 60%
VALLOX DIGIT2 SE 2.7 kW, 12.0 A
Preheating unit Electric 1200 W, 5.2 A
Post-heating unit Electric 1200 W, 5.2 A
VALLOX DIGIT2 SE VKL 1.55 kW, 6.7 A
Preheating unit Electric 1200 W, 5.2 A
Post-heating unit VKL water radiator
VALLOX DIGIT2 SE MLV VKL 0.35 kW, 1.5 A
Preheating unit MLV liquid radiator
Post-heating unit VKL water radiator
VALLOX DIGIT2 SE MLV, electric 1,55 kW, 6,7 A
Preheating unit MLV liquid radiator
Post-heating unit Electric 1200 W, 5.2 A
Filters Supply air G3 and F7
Extract air G3
Weight 71 kg
Ventilation Control panel control
adjustment options Week-clock control
CO2and %RH control (option)
Wireless remote control (option)
Options CO2sensor
%RH sensor
Wireless remote control
Filter guard (supply and/or extract air)
LON converter
Ceiling mounting
Attic floor penetration
Silencer element
VKL expansion tank + stand
VKL heat exchanger pipe
• Supply and extract air ventilation
with heat recovery
• Silent operation
• Energy-efficient unit; high-efficiency
cross-flow cell
• Electronic DIGIT SED control or
wireless remote monitoring (option)
• Week clock control
• Humidity control (option)
• Carbon dioxide control (option)
• Maintenance reminder
• Summer/winter automation
• Fireplace/booster switch function
• Good filtering
• Fixed air flow measuring outlets
• MLV model especially designed for
use with ground heat systems
• Easy and quick installation
• Silencer element (option)
DIGIT SED
ELECTRONIC CONTROLLER
WITH LCD DISPLAY
Vallox
SE
2
Digit

12
5
4
19
20
1
2
3
4
6
7
9
13
8
10
11
21
5
Dimensions and duct outlets
Duct outlets
Inner diameter of collar
ø 160 mm + connector outlets
VALLOX DIGIT2 SE models
Code: 3550 SE
VALLOX DIGIT2 SE
• Preheating radiator: electric, 1200 W
• Post-heating radiator: electric, 1200 W
VALLOX DIGIT2 SE VKL
• Preheating radiator: electric 1200 W
• Post-heating radiator: VKL water radiator
Main parts
12
13
15
10
10
11
11
14
14
16
17
18
1
2
3
4
5
6
7
8
9
19
Extract air fan 210 W/0.92 A,
alternating current (AC)
Supply air fan 210 W/0.92 A,
alternating current (AC)
Electrical quick-connect terminal for fan
Preheating unit
(electric 1.2 kW or liquid)
Post-heating unit
(electric 1.2 kW or water)
Heat recovery cell
Outdoor air filter F7
Outdoor and extract air prefilter G3
Summer/winter damper
Maintenance switch
Connection box cover plate
Self-actuated one-way dampers
(only in VKL and MLV models)
Plug 1.8 m
Humidity sensor (option)
Control panel
CO
2
sensor (option)
LON converter (option)
Air flow measuring outlets
(behind cover plate)
Water radiator actuator/valve
Connection ø 12
MLV connection ø 10 cu
20
21
Supply air to the dwelling
Extract air from the dwelling
Outdoor air to the unit
Exhaust air outside
4
3
2
1
Model R
Exhaust air outside
Outdoor air to the unit
Extract air from the dwelling
Supply air to the dwelling
4
3
2
1
Model L
Supply liquid/water
Return liquid/water
B
A
596
616
541 616
17
541
569 15
1
2
3
4
104131.5125131.5104
173.1211
54 19
40.9 28 40.9
28
19
54
52 R1/2
3
4
2
1
B
ABA
© VALLOX • We reserve the right to make changes without prior notification.
VALLOX DIGIT2 SE/VKL/MLV
DIMENSIONS AND MAIN PARTS
2
2
14 15 16 17
The picture shows VALLOX DIGIT2 SE
model R (electric radiator model). VKL/MLV model units
18
VALLOX DIGIT2 SE MLV VKL
• Preheating radiator: MLV liquid radiator
• Post-heating radiator: VKL water radiator
VALLOX DIGIT2 SE MLV, electric
• Preheating radiator: MLV liquid radiator
• Post-heating radiator: electric, 1200 W
The letter L or R after the name of the unit indicates whether the unit is
left- or right-handed.

Pressure loss in ducts. Total pressure.
Volume flow rate
E = Extract air fan
S = Supply air fan
E = Extract air fan
S = Supply air fan
Pressure loss in ducts. Total pressure.
Volume flow rate
ED and SD are examples of pressure
losses in supply and extract ducts
SFE 2.5 kW/m3/s
12345678
E
E
E
E
E
E
E
E
S
S
S
S
S
S
S
S
dm3/s
m
3
/h
10 20 30 40 50 60 70 80 90 100
50
110 130
100 150 200 250 300 400 450 500
120
350
100
50
150
200
250
300
350
0
At a lower total pressure, SFP
will be smaller at this speed.
© VALLOX • We reserve the right to make changes without prior notification.
Air flows/DIGIT2 SE (electric radiator unit, winter setting)
Measuring points after the connection
outlet. Fan curves indicate the total
pressure available for duct losses.
VALLOX DIGIT2 SE/VKL/MLV
PERFORMANCE
3
1
2
3
4
5
6
7
8
Fan speeds Fan input
power
W
60
80
100
120
140
160
180
230
42
67
97
130
167
205
242
315
Control
voltage
(V)
Air flows/DIGIT2 SE VKL (liquid radiator unit, winter setting)
NOTE!
If the unit has a post-heating
radiator, it must be selected
when the system is adjusted.
Air flow measurement outlets
The fixed air flow measurement outlets
are located behind the cover plate.
You can measure the total pressure of
the supply and extract air ductwork at
the measurement outlets using a
pressure gauge.
Compare the pressure readings with the
air volume curves to see unit air flows
at various adjustment positions.
The red measurement hose gives the
pressure reading for the supply air
ductwork and the black hose the
pressure reading for the extract air
ductwork. Observe unit model and
setting (summer or winter).
SFP (Specific Fan Power)
guideline value < 2.5 (kW/m3/s) SFP = Air flow (max.) (dm3/s)
Input power (total) (W)
ED and SD are examples of pressure
losses in supply and extract ducts SFP (Specific Fan Power)
guideline value < 2.5 (kW/m3/s)
Supply air Extract air
SE
ED is an example
of pressure loss
in extract ducts
Extract air flow during heat recovery bypass (summer setting)
Pressure loss in ducts. Total pressure Pa
Volume flow rate
dm3/s
m
3
/h
100
50
150
200
250
300
350
PK
dm3/s
m3/h
10 12
20 30 40 60 70 80
34567
090
50
8
110 130
100 150 200 250 300 350 400 450 500
50 100 120
SD ED
100
50
150
200
250
300
350
10 20 30 40 50 60 70 80
090 100
50
8E
7E
6E
5E
4E
3E
2E
1E
110 120 130
400 450 500
5S
8S
7S
6S
4S
3S
2S
1S
At a lower total pressure, SFP
will be smaller at this speed.
SFP 2.5 kW/m3/s
dm3/s
m
3
/h
SD
ED
100 150 200 250 300 350
ED
RECOMMENDED
OPERATING RANGE
RECOMMENDED
OPERATING RANGE
RECOMMENDED
OPERATING RANGE

VALLOX DIGIT2 SE/VKL/MLV
PERFORMANCE
4© VALLOX • We reserve the right to make changes without prior notification.
63
125
250
500
1000
2000
4000
8000
LW, dB
LWA, dB(A)
LpA, dB(A)
1
15,2
64,1
52,3
42,8
42,8
39,8
29,4
24,6
64,4
44,7
Digit2 SE
AP
qV, dm3/s 2
25,8
68,7
58,4
49,7
46,6
51,1
37,3
32,9
23,2
69,2
52,6
3
36,1
71,2
62,6
54,8
51,0
52,9
43,8
39,4
31,5
71,9
55,9
4
48,3
74,4
68,0
58,1
54,0
55,6
48,1
43,8
39,4
75,5
59,3
5
59,2
73,3
68,3
61,1
56,8
58,0
51,6
47,0
42,8
74,9
61,7
6
70,5
77,0
69,5
63,7
59,1
59,2
55,0
49,9
45,8
78,0
63,7
7
79,1
77,2
70,6
65,3
61,0
60,3
58,4
51,9
47,9
78,5
65,5
8
89,8
78,2
72,8
67,5
63,5
61,8
61,0
54,3
50,7
79,8
67,6
56,3
50,0
39,8
34,3
34,2
27,0
57,3
39,5
63,4
56,7
47,0
40,2
39,4
33,9
25,2
64,4
45,9
66,8
61,4
52,1
44,2
42,7
38,9
31,5
68,0
50,1
66,3
62,9
55,4
46,7
45,0
42,3
34,4
24,3
68,2
52,5
64,1
63,4
59,9
48,7
46,8
45,0
37,1
26,5
69,1
54,2
70,2
65,2
60,0
50,6
48,1
47,1
39,2
32,5
71,8
56,1
70,4
66,9
62,2
52,9
50,2
49,5
41,9
36,3
72,5
58,2
50,3
39,4
31,6
30,3
25,9
17,4
50,8
32,1
1
23,7 2 33,3 3 42,2 4 54,5 5 68,5 6 82,7 7 92,1 8 109,0
11,8
1
20,3 / 23,2
23,7
2
32,1 / 35,1
32,8
4
56,8 / 61,2
36,2
5
68,4 / 74,4
38,5
6
78,4 / 86,2
40,7
7
86,2 / 95,7
42,9
8
97,3 / 109,0
28,9
3
44,5 / 47,8
AP
supply/extract,dm3/s
Sound values Sound power level from the ventilation unit
to supply air ducts by octave band Lw, dB
ADJUSTMENT POSITION / AIR FLOW
Sound power level from the ventilation unit
to extract air ducts by octave band Lw, dB
ADJUSTMENT POSITION / AIR FLOW
Medium
frequency
of the octave
band, Hz
ADJUSTMENT POSITION / AIR FLOWS (supply / extract)
A-weighted sound pressure level dB (A) coming from
the unit through the envelope in rooms where
the unit has been installed (10 m2sound absorption)

VALLOX DIGIT2 SE/VKL/MLV
1 2 3 4
5 6 7 8
Keyboard
Main display
Paneelin osoite
1
Panel address
1
Control
VALLOX DIGIT SE can be controlled with the control panel coming with the unit (3 at most) and with
optional CO2(5 at most) and %RH sensors (2 at most). Fan speeds of the unit can be controlled via
remote monitoring with a voltage or current signal. In case of disturbances, a potential-free relay
contact signal is issued.
With an optional VALLOX LON converter, the whole operation of the unit can be controlled via remote
monitoring.
Week clock control
The week clock in the control panel of the unit can be used to programme the desired fan power
option (1…8) for each hour in the day.
21 C
3
10:20
Fan speed can be changed in this display with the + and – buttons
3
Scrolling up
With this button, you can scroll
the displays upward.
Scrolling down
With this button, you can scroll
the displays downward.
Increase button
With this button, you can increase values.
Decrease button
With this button, you can decrease
values.
Start button
With this button, you switch the unit on and off. When the
indicator is lit, the unit is on.
Carbon dioxide adjustment
With this button, you set carbon dioxide adjustment on
and off. When the indicator is lit, the adjustment is on.
Humidity adjustment
With this button, you set humidity adjustment on and off.
When the indicator is lit, the adjustment is on.
Post-heating
With this button, you set post-heating on and off. When
the indicator is lit, post-heating is on. The summer function
is active when the indicator is not lit.
1
2
3
4
5
6
7
8
Fan speed (3).
Supply air temperature (21 °C).
Post-heating is on.
Time.
Filter guard alert.
Maintenance reminder alert.
Fireplace / booster switch on. The fireplace /
booster switch is activated in this display by
simultaneously pressing down the + and – buttons
for 2 seconds.
Week clock control on.
21 C
10:20
Mounting, removing and wiring of control panel
The control panel is wired straight from the electrical connection box. The control panel can
also be connected in series with a CO2sensor or another control panel. (See External
electrical connections on page 8).
Control panel addresses
If two or more control panels are connected to the system, the addresses of the control panels
need to be changed.
E.g. 3 control panels.
• Connect the first control panel to the unit and change its address to 3.
• Connect the second control panel to the unit and change its address to 2.
• Connect the third control panel and make sure that its address is 1.
If control panels have the same address, they go to bus fault state. In this case, remove one of the control panels
and change the address of the other panel. The above mentioned situation can arise in connection with the later
installation of an additional control panel.
Control panel
Surface mounting
of control panel
A control panel is mounted
on the wall or on a 1-part
instrument box.
Wiring
Width 90 mm
Height 110 mm
Depth 23 mm Electronics board of control panel
1 = orange 1 = +
2 = white 1 = –
3 = orange 2 = A
4 = white 2 = B
5 = metal = signal ground
ca. 21 VDC
}
Cable:
NOMAK 2 x 2 x 0.5 mm2+ 0.5 mm2
NOTE!
Faulty coupling of the (+) wire
destroys the control panel!
12345
+ – A B M
© VALLOX • We reserve the right to make changes without prior notification.
VALLOX DIGIT SED CONTROL PANEL
5

VALLOX DIGIT2 SE/VKL/MLV
Surface mounting Wiring
Cable:
NOMAK 2 x 2 x 0.5 mm2+ 0.5 mm2
Base plate of the CO2sensor Electronics card of the CO2sensor (model may vary)
NOTE!
Faulty coupling of the (+) wire destroys
the carbon dioxide sensor!
1 = orange 1 = +
2 = white 1 = –
3 = orange 2 = A
4 = white 2 = B
5 = metal = signal ground
ca. 21 VDC
}
14
125
38
76
Connecting two or more
units (slave unit)
Connect slave units as
specified in the adjoining
connection instructions.
Slave units do not operate
independently, but follow the
instructions received from the
host unit. Neither control
panel nor sensors must be
connected to a slave unit.
NOTE! + wire must not be connected to a SLAVE UNIT. SLAVE UNIT must not have a 6K8 resistor in place.
SLAVE UNIT TERMINAL BLOCKHOST UNIT TERMINAL BLOCK SLAVE UNIT TERMINAL BLOCK SLAVE UNIT TERMINAL BLOCK
HUMIDITY SENSORS
• When mounting two or more humidity
sensors, connect them to the terminal
block of the connection box by connec-
ting the first humidity sensor to %RH1,
in place of the 6K8resistor in the termi-
nal block (remove the resistor in this ca-
se), and the second humidity sensor to
%RH2. See the electrical diagram.
CARBON DIOXIDE SENSORS
• Carbon dioxide sensors are connected
individually.
• When the first carbon dioxide sensor has
been connected to the system, the unit is
switched on. After this, the unit gives the
sensor an address. Follow the same steps
for other carbon dioxide sensors.
S +
The sensor is wired straight from the electrical connection box of the unit.
The CO2sensor is connected directly from the connection box of the unit, or in series with
another CO2sensor or control panel (see External electrical connections on page 8).
Surface mounting Wiring
Cable:
2 x 0.5 mm2
Electronics board of
%RH sensor
Base plate
of sensor
14
125
38
76
Mounting and wiring of humidity sensor
Mounting and wiring of carbon dioxide sensor
1 2 3 4 5
+ – A B M
© VALLOX • We reserve the right to make changes without prior notification.
2
6
SENSORS

VALLOX DIGIT2 SE/VKL/MLV
Silencer unit
VALLOX DIGIT2 SE
596
569
min. 1234
616
Sound values Digit 2 E + silencer unit
64 67 69 72 72 74 77 76
51 57 61 66 69 68 69 70
39 45 49 53 56 58 60 62
25 31 35 38 41 43 45 48
10 21 21 24 26 29 31 34
* * * 1311171821
* * * * 14 19 22 24
*******23
64 67 70 73 74 75 77 77
37 43 46 50 53 54 55 56
54 61 65 68 69 71 71 74
* 40525659606365
22 34 42 47 51 54 56 59
* 18263237404245
* * 11 21 28 32 36 39
* * * * 12 18 23 28
*******16
********
54 61 65 68 70 71 72 74
24 32 39 43 46 48 50 53
12345678
20/25 31/37 43/50 55/64 66/77 76/89 84/99 95/112
20 26 31 34 37 40 41 44
Pressure loss in ducts. Total pressure Pa
Volume flow rate
VALLOX silencer unit + DIGIT2 SE
(winter setting)
SFP 2,5 kW/m3/s
© VALLOX • We reserve the right to make changes without prior notification.
PERFORMANCE/VALLOX SILENCER UNIT
5
63
125
250
500
1000
2000
4000
8000
LW, dB
LWA, dB(A)
1
16/24
2
25/47
3
36/70
4
48/90
5
58/104
6
68/116
7
75/131
8
87/148
1
25/7
2
38/7
3
46/46
4
59/69
5
72/79
6
82/106
7
92/112
8
104/141
LpA, dB(A)
AP
qV, dm3/s
AP
supply/extract,dm3/s
ED and SD are
examples of
pressure losses in
supply and extract
ducts.
100
50
150
200
250
300
350
SD
ED
dm
3
/s
m
3
/h
10
12
20 30 40 50 60 70 80
E – Extract air fan
S – Supply air fan
34567
0
90 100
50
8
110 120 130
100 150 200 250 300 350 400 450 500
RECOMMENDED
OPERATING RANGE
At a lower total pressure, SFP
will be smaller at this speed.
2S
3S
1S
4S
5S
6S
7S
8S
1E
2E
3E
4E
5E
6E 7E
8E
Sound power level from the ventilation unit
to supply air ducts by octave band Lw, dB
ADJUSTMENT POSITION / AIR FLOW
Sound power level from the ventilation unit
to extract air ducts by octave band Lw, dB
ADJUSTMENT POSITION / AIR FLOW
Medium
frequency
of the octave
band, Hz
ADJUSTMENT POSITION / AIR FLOWS (supply / extract)
A-weighted sound pressure level dB (A) coming from
the unit through the envelope in rooms where
the unit has been installed (10 m2sound absorption)

VALLOX DIGIT2 SE/VKL/MLV
© VALLOX • We reserve the right to make changes without prior notification.
INTERNAL ELECTRICAL DIAGRAM
8
H
TK
U1 U3
L2 N4
3
pu/s
FAULTSIGNAL
L
NC
Post-heating electric
radiator
40°C
CONNECTION BOX (inside the unit)
ke-vi
80°C
4
80°C
R1
T1
5
m
3R
CONNECTION BOX (on top of the unit)
+
S
GND
m
-
FREEZING PROTECTION (EXHAUST AIR) SUPPLY AIR TO DWELLING OUTDOOR AIR TO UNIT EXTRACT AIR FROM DWELLING
+ A B
PWM1 PWM2
S PRESSURE SWITCH S RH2
T2
S RH1
L N
NO
2
N
230 V 180 V 160 V
RH1
L
NO
140 V 120 V 100 V
80 V
60 V
30°C
55°C
M
3L
RH2
55°C
N
1
3
4
5
A
6
L
2
7
S+S
ke
s
L1
R2
A-++
pu
N
T1
T2
LN +S 21 S GND
m
M
B
vio
ha
r
va
ro
vi
N L2
Water radiator
actuator (VKL
models)
V
H
RS-485 BUS
PM
P1
P2
89
NC
NTC SENSORS
MOTHER CARD
FUSE T800mA
FAULT SIGNAL FAULT SIGNAL FIREPLACE SWITCH REMOTE MONITORING
1
10
2
3
4
5
6
7
89 1
10
16x0.25mm2
12
A
23
4
REMOTEMONITORING
0-10V DCor 0-20mA
ha/ro
L
6
7
FIREPLACESWITCH
6
va/vi
va/ke
R
ke/r
r/vi
7
5
7018800
21
N
K
K
12
r
s
m
r
2N 12N 1
8 x 1s
1
ha
r
ha
r
VALLOX DIGIT2 SE
Damper motor connection
3R = R model
3L = L model
E
S
m
s
ke-vi
S Supply air fan
E Extract air fan
M Autotransformer with
protective voltage coil
K Capacitor
H Interference suppressor
L Earthed cord
TK Safety switch
V Water radiator actuator/valve
T1 Safety thermostat of heating radiator
T2 Overheating protector 2 pcs
R1 Post-heating radiator
R2 Preheating radiator
PM Damper motor 21 V DC
P1 Filter guard, option (supply)
P2 Filter guard, option (extract)
Wire colours
s = blue
m = black
r = brown
vi = green
ke = yellow
pu = red
ro = rose
va = white
ha = grey
vio = violet
CONTROL VOLTAGE OF FANS / CURRENT
SIGNAL SELECTION WITH JUMPER A
Electric preheating
radiator
USE OF JUMPER IN VOLTAGE SIGNAL
CONTROL (FACTORY SETTING) USE OF JUMPER IN CURRENT SIGNAL CONTROL

VALLOX DIGIT2 SE/VKL/MLV
© VALLOX • We reserve the right to make changes without prior notification. 9
External electrical connection VALLOX DIGIT2 SE
VALLO X DIGIT2 SE
EXTERNAL ELECTRICAL DIAGRAM
LON CONVERTER
OPTION
NOTE!
Faulty coupling of the + wire
DESTROYS THE CONTROL PANEL.
CONTROL PANEL 1
ONE OR MORE, 1 AS STANDARD
NOTE!
Faulty coupling of the + wire
DESTROYS THE SENSOR.
CO2 SENSOR 1
ONE OR MORE
OPTION
HUMIDITY SENSOR %RH2
OPTION
THE FIRST SENSOR IS
CONNECTED TO REPLACE THE
R6k8 RESISTOR.
HUMIDITY SENSOR %RH1
OPTION
BLACK = M
WHITE 2 = B
ORANGE 2 = A
WHITE 1 = -
ORANGE 1 = +
FAULT SIGNAL MAX.
1 A, 24 VDC
(POTENTIAL-FREE
CONTACTS)
FIREPLACE SWITCH
pressure switch
(self-resetting)
0-10 VDC
(10 VDC, 20 mA)
or
0-20 mA
REMOTE MONITORING
(SHORT-CIRCUIT WIRE HAS TO BE
REMOVED BEFORE CONNECTION)
CONNECTION BOX (on top of the unit)
FAN CONTROL FIREPLACE
SWITCH FAULT SIGNAL RS-485 BUS
PLUG CONNECTION 10A/16 A
16 A WHEN THE UNIT IS EQUIPPED WITH ELECTRIC PRE- AND POST-HEATING
1.8 m FROM THE TOP OF THE UNIT
SOLENOID VALVE
CIRCULATION PUMP
CONTROL OF EXTERNAL SOLENOID VALVE
AND CIRCULATION PUMP IN MLV UNIT

VALLOX DIGIT2 SE/VKL/MLV
© VALLOX • We reserve the right to make changes without prior notification.
POST-HEATING/VKL RADIATOR PERFORMANCE
10
VALLOX DIGIT2 SE/performance of VKL post-heating radiator
Temperature of air coming to the radiator 12 °C
liquid flow 0.05 dm3/s
liquid flow 0.03 dm3/s
Power of VKL water radiator Pressure loss in VKL water radiator
Radiator pressure loss, kPa
10
5
15
20
25
0
0.06
Water flow, dm
3
/s
30
0.08
0.04
0.02
0
Pressure loss in the valve
0.3 0.4
Liquid flow dm
3
/s
0.20.02 0.03 0.04 0.05 0.06 0.08 0.10.01
1 2 3 4 567
0.25 0.5 0.75 1.00 1.25 1.45 1.55 1.7
17.5=open
Adjustment position
Kv value
Pressure loss p kPa
Cooling of water in the radiator
0.5
0.25
0.75
1.0
1.25
0
15
10
5
0
Cooling of water in the radiator °C
Total power of the radiator kW
50 dm
3
/s
0.5
0.25
0.75
90 dm
3
/s
Air flow
1.0
1.25
0
25 30 20
15
12
30 dm
3
/s
70 dm
3
/s
Temperature of air going out of the unit °C
Total power of the radiator kW
45 °C
35 °C
25 °C
Temperature of
water coming to
the radiator
Temperature of air coming to the radiator 12 °C
liquid flow 0.05 dm3/s
liquid flow 0.03 dm3/s

AIR FLOW
AIR FLOW
MLV RADIATOR PRESSURE LOSS
30 dm3/s
Temperature of air leaving the radiator °C
-2
-4
0
2
4
Geothermal liquid temperature °C
-6
90 dm3/s
6810
42
0
Temperature of air leaving the radiator °C
17
16
Geothermal liquid temperature °C
18
19
20
30 dm3/s
50 dm3/s
21
22
6
42
0
50 dm3/s
70 dm3/s
70 dm3/s
90 dm3/s
810
Radiator pressure loss, kPa
10
5
15
20
25
0
0.06
liquid flow, dm
3/s
30
0.08
0.04
0.02
0
35
Performance of VALLOX DIGIT2 SE MLV heating/cooling radiator
MLV RADIATOR HEATING POWER
Ethanol 30%, flow rate 0.07dm3/s
Incoming air -12°C
MLV RADIATOR COOLING POWER (1.5…2.5 kW)
Ethanol 30%, flow rate 0.07 dm3/s
Incoming air 28 °C, relative humidity RH 60%
VALLOX DIGIT2 SE/VKL/MLV
© VALLOX • We reserve the right to make changes without prior notification. 11
POST-HEATING/MLV RADIATOR PERFORMANCE

CO2Carbon dioxide sensor Adjustment range 500...2000 ppm (900) Option
Carbon dioxide control Adjustment range 1…15 min. (10)
G3 Filter Supply air, extract air Standard
F7 Filter Supply air Standard
PM Damper motor Automatic HR bypass Standard
24 V, 0.5 W, 2 Nm
H Control panel User interface Standard
R2 Preheating unit Electric radiator 1.2 kW Standard
R1 Post-heating unit Electric radiator 1.2 kW Standard
HR Heat recovery cell Cross-counter flow, efficiency = 60% Standard
P1 Pressure difference switch Adjustment range 0...500 Pa (320) Option
Pressure guard on
the supply air side
P2 Pressure difference switch Adjustment range 0...500 Pa (320) Option
Pressure guard on
the extract air side
E Extract air fan AC qv = 120dm3/s (120 Pa) Standard
%RH Humidity sensor Automatic/adjustment range 1...99% (99) Option
Humidity control Adjustment interval 1...15 min. (10)
Code Name Technical data
(factory settings in parentheses) Standard/ Option Code Name Technical data
(factory settings in parentheses) Standard/ Option
PM
TS2
R2
TE3
G 3
F 7
M
P1
S
P2
M
E
TE4 TE2
G 3
TE1
TS3
TS4
5044900B 2011-01-05 KP
HR
16 A
VALLOX DIGIT2 SE
S
11 2
1
H%RH
1
CO 2%RH
TS1
R1
SILENCER
UNIT
VALLOX DIGIT2 SE/VKL/MLV
© VALLOX • We reserve the right to make changes without prior notification.
CONTROL DIAGRAM/ELECTRIC RADIATOR
12
Parts list VALLOX DIGIT2 SE (electric radiator model)
TE1 Temperature sensor Exhaust air temperature Standard
HR antifreeze, Adjustment range -6...+15 °C (HR)
preheating control Adjustment range -6...+15 °C
(preheating)
TE2 Temperature sensor Supply air temperature Standard
TE3 Temperature sensor Outdoor air temperature Standard
TE4 Temperature sensor Extract air temperature Standard
S Supply air fan AC qv = 110 dm3/s (100 Pa) Standard
TS1 Overheat protector for Automatic +40 °C Included in
the heating unit R1
TS2 Overheat protector for Manually reset, +80 °C Included in
the heating unit R1
TS3 Overheat protector for Automatic +30 °C Included in
the heating unit R2
TS4 Overheat protector for Manually reset, +55 °C Included in
the heating unit R2
TK Fireplace/booster switch function In the controller Standard
Either fireplace or booster
switch function Separate switch Option
LON LON converter Remote monitoring control Option
VALLOX DIGIT2 SE (electric radiator model)
DISTRIBUTION
PANEL
LON
CONVERTER
REMOTE MONITORING CONTROL CENTRE OF THE PROPERTY
ALARM
OPERATION MODE
CONTROL
MEASUREMENT
ADJUSTMENT
VENTILATION ZONE
INTERNAL ELECTRICAL AND CONTROL CONNECTIONS
POST-
HEATING
RADIATOR
PREHEATING
RADIATOR
FIREPLACE/
BOOSTER SWITCH
CARBON DIOXIDE SENSOR (5 AT MOST)
CONTROL PANEL (3 AT MOST)
HUMIDITY SENSOR (2 AT MOST)
SILENCER
SILENCER
PRESSURE
SWITCH
PRESSURE
SWITCH
PLUG

VALLOX DIGIT2 SE/VKL/MLV
© VALLOX • We reserve the right to make changes without prior notification. 13
DESCRIPTION OF OPERATION/ELECTRIC RADIATOR
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 minimum power. 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 (CO2and %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. It is also possible to select an automatic
search for the humidity content setpoint at 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 base and maximum fan speeds. The base and
maximum fan speeds can be set at the desired level at 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 base fan
speed. This means that fan speed can be raised when necessary, but
not lowered, by the manual, CO2and %RH controls.
Supply air temperature
Supply air temperature can be controlled with either constant temperature
control or cascade control.
Constant temperature control of supply air
The control unit directs the operation of post-heating unit R1 on the
basis of the measuring data given by temperature sensor TE2, aiming
at keeping supply air temperature at the temperature value
(+10...+30 °C) set at control panel H.
Cascade control of supply air
The control unit directs the operation of post-heating unit R2 on the
basis of the measuring data given by extract air temperature sensor
TE4, aiming at keeping supply air temperature at the temperature value
(+10...+30 °C) set at control panel H.
Heat recovery bypass
Heat recovery is active whenever post-heating is switched on. Automatic
heat recovery bypass is active when post-heating is switched off and
outdoor air temperature exceeds the threshold set (to bet set in the
range of 0... +25 °C). The control centre then controls the operation
of damper motor PM on the basis of the measurement data given by
outdoor air sensor TE3 and extract air temperature sensor TE4 in order
to get as cool supply air as possible in the ventilation zone. However,
heat recovery is active whenever outdoor air temperature falls below
the threshold set, or when outdoor air is warmer than extract air.
Heat recovery antifreeze
The control centre of the unit controls the operation of preheating unit
R2 on the basis of the measurement data given by temperature sensors
TE1 and TE3, preventing the risk of freezing and the intermittent stopping
of supply air fan S. If the power of preheating unit R2 is not enough
or is not on, the control centre intermittently stops supply air fan Son
the basis of the measurement data given by temperature sensors TE1
and TE3, preventing the HR cell from freezing. As soon as the risk
passes, the fan restarts automatically. The threshold temperature for
antifreeze (-6...+ 15 °C) and the difference area (1 ...10 °C) can be
set at control panel H. When fan Tstops, power supply from radiator
R2 stops and post-heating radiator R1 continues to heat.
For preheating to work, its threshold temperature has to be set by at
least one degree higher than the threshold temperature controlling the
stopping of the fan. Temperatures are adjusted at control panel H.
Overheat protection for the heating unit
Overheat protection thermostats TS1 and TS2 monitor the surface
temperature of heating unit R1, while overheat protection thermostats
TS3 and TS4 the surface temperature of heating unit R2. If surface
temperature exceeds the threshold, the overheat protector trips and
power supply to the heating unit is stopped. Overheat protectors TS1
and TS3 are reset automatically, whereas overheat protectors TS2 and
TS4 are reset manually.
Alarms
Pressure difference switches P1 and P2 monitor pressure difference on
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 at 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:
• Alarm of high carbon dioxide content (> 5000 ppm) switches the
relay at 1-second intervals.
• In other fault situations, such as sensor faults, the contacts 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 Hand/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 a VALLOX LON converter. (See a separate
brochure.)
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 signal 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)

Code Name Technical data
(factory settings in parentheses) Standard/ Option Code Name Technical data (factory settings in parentheses) Standard/ Option
CO2Carbon dioxide sensor Adjustment range 500...2000 ppm (900) Option
Carbon dioxide control Adjustment range 1…15 min. (10)
G3 Filter Supply air, extract air Standard
F7 Filter Supply air Standard
PM Damper motor Automatic HR bypass, 24 V, 0.5 W, 2 Nm Standard
H Control panel User interface Standard
R2 Preheating unit Electric radiator 1.2 kW Standard
R1 Post-heating unit Water radiator Standard
HR Heat recovery cell Cross-counter flow, efficiency = 60% Standard
P1 Pressure difference switch unit Adjustment range 0...500 Pa (320) Option
Pressure guard on
the supply air side
P2 Pressure difference switch unit Adjustment range 0...500 Pa (320) Option
Pressure guard on
the extract air side
E Extract air fan AC qv = 120 dm3/s (120 Pa) Standard
%RH Humidity sensor Automatic/adjustment range 1...99% (99) Option
Humidity control Adjustment interval 1...15 min. (10)
5045000B 2011-01-05 KP
R2
TS3
TS4
Ljm
R1
V
TE3
G 3
F 7
M
P1
S
PM
TE4 TE2
P2
Ljp
G 3
TE1
HR
10 A
VALLOX DIGIT2 SE VKL
S
11 2
1
H%RH
1
CO 2%RH
SP
M
E
SP
SILENCER
UNIT
VALLOX DIGIT2 SE/VKL/MLV
© VALLOX • We reserve the right to make changes without prior notification.
CONTROL DIAGRAM/VKL MODEL
14
Parts list VALLOX DIGIT2 SE VKL (water radiator model)
TE1 Temperature sensor, Exhaust air temperature Standard
HR antifreeze, Adjustment range -6...+15 (HR)
preheating control Adjustment range -6...+15 °C
(preheating)
TE2 Temperature sensor Supply air temperature Standard
TE3 Temperature sensor Outdoor air temperature Standard
TE4 Temperature sensor Extract air temperature Standard
S Supply air fan AC qv = 100 dm3/s (100 Pa) Standard
V Water radiator actuator/valve Standard
TS3 Overheat protector Automatic +30 °C Included in
for the heating unit R2
TS4 Overheat protector Manually reset, +55 °C Included in
for the heating unit R2
TK Fireplace/booster switch function In the controller Standard
Either fireplace or
booster switch function Separate switch Option
SP Damper, 2 pcs Air flow operated Standard
LON LON converter Remote monitoring control Option
VALLOX DIGIT2 SE VKL (water radiator model)
DISTRIBUTION
PANEL
PLUG
LON
CONVERTER
REMOTE MONITORING CONTROL CENTRE OF THE PROPERTY
ALARM
OPERATION MODE
CONTROL
MEASUREMENT
ADJUSTMENT
VENTILATION ZONE
INTERNAL ELECTRICAL AND CONTROL CONNECTIONS
POST-HEATING
RADIATOR, WATER
PREHEATING RADIATOR,
ELECTRIC
SILENCER
SILENCER
PRESSURE
SWITCH
PRESSURE
SWITCH
FIREPLACE/
BOOSTER SWITCH
CARBON DIOXIDE SENSOR (5 AT MOST)
CONTROL PANEL (3 AT MOST)
HUMIDITY SENSOR (2 AT MOST)

VALLOX DIGIT2 SE/VKL/MLV
© VALLOX • We reserve the right to make changes without prior notification. 15
DESCRIPTION OF OPERATION/VKL MODEL
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 minimum power. 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 (CO2and %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. It is also possible to select an
automatic search for the humidity content setpoint at 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 base and maximum fan speeds. The base and
maximum fan speeds can be set at the desired level on 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 base fan
speed. This means that fan speed can be raised when necessary, but
not lowered, by the manual, CO2and %RH controls.
Supply air temperature
Supply air temperature can be controlled with either constant temperature
control or cascade control.
Constant temperature control of supply air
The control unit directs the operation of post-heating unit R1 on the
basis of the measuring data given by temperature sensor TE2, aiming
at keeping supply air temperature at the temperature value (+10...+30
°C) set at control panel H.
Cascade control of supply air
The control unit directs the operation of post-heating unit R1 on the
basis of the measuring data given by extract air temperature sensor
TE4, aiming at keeping supply air temperature at the temperature value
(+10...+30 °C) set at control panel H.
Heat recovery bypass
Heat recovery is active whenever post-heating is switched on. Automatic
heat recovery bypass is active when post-heating is switched off and
outdoor air temperature exceeds the threshold set (to bet set in the
range of 0... +25 °C). The control centre then controls the operation
of damper motor PM on the basis of the measurement data given by
outdoor air sensor TE3 and extract air temperature sensor TE4 in order
to get as cool supply air as possible in the ventilation zone. However,
heat recovery is active whenever outdoor air temperature falls below
the threshold set, or when outdoor air is warmer than extract air.
Heat recovery antifreeze
The control centre of the unit controls the operation of preheating unit
R2 on the basis of the measurement data given by temperature sensors
TE1 and TE3, preventing the risk of freezing and the intermittent stopping
of supply air fan S. If the power of preheating unit R2 is not enough
or is not on, the control centre intermittently stops supply air fan Son
the basis of the measurement data given by temperature sensors TE1
and TE3, preventing the HR cell from freezing. As soon as the risk
passes, the fan restarts automatically. The threshold temperature for
antifreeze (-6...+ 15 °C) and the difference area (1...10 °C) can be
set at control panel H. When fan Tstops, power supply from radiator
R2 stops and post-heating radiator R1 continues to heat.
For preheating to work, its threshold temperature has to be set by at
least one degree higher than the threshold temperature controlling the
stopping of the fan. Temperatures are adjusted at control panel H.
Overheat protection for the heating unit
Overheat protection thermostats TS3 and TS4 monitor the surface
temperature of heating unit R2. If surface temperature exceeds the
threshold, the overheat protector trips and power supply to the heating
unit is stopped. Overheat protector TS3 is reset automatically, whereas
overheat protector TS4 is reset manually.
Water radiator freezing protection
The control centre of the unit stops fans Sand E, valve Vremains open
and self-actuated dampers SP close based on the measurement data
given by outdoor air temperature sensor TE3 (outdoor air < 0 °C) and
supply air temperature sensor TE2 (supply air < 7 °C), reducing the risk
of water heating unit R1 freezing. A freezing alert appears in the
display of the control panel. The fans restart automatically and dampers
SP open as soon as the risk of freezing passes (supply air > 10 °C).
Alarms
Pressure difference switches P1 and P2 monitor pressure difference on
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 at 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 antifreeze function of the water-circulating radiator is on,
the contacts 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 sensor faults, the contacts 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 Hand/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 a VALLOX LON converter. (See a separate
brochure.)
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 signal 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)

Ljm
R1
V
TE3
G 3
F 7
R2
PM
M
P1
T
TE4 TE2
Ljp
G 3
KP
TE1
MV
LTO
10 A
VALLOX DIGIT2 SE MLV VKL
S11 2
1
H%RH
1
CO 2%RH
SP
M
P2
P
SP
5045100B 2011-01-05 KP
TS2
M
P1
S
TS1
R1
TE3
G 3
F 7
R2
PM
TE4 TE2
G 3
KP
TE1
MV
HR
10 A
VALLOX DIGIT2 SE MLV VKL
S
11 2
1
H%RH
1
CO
2
%RH
M
P2
E
SP
SILENCER
UNIT
SILENCER
UNIT
VALLOX DIGIT2 SE/VKL/MLV
© VALLOX • We reserve the right to make changes without prior notification.
CONTROL DIAGRAM/MLV MODEL
16
VALLOX DIGIT2 SE MLV VKL (heating/cooling radiator model with water postheating unit)
VALLOX DIGIT2 SE MLV electric (heating/cooling radiator model with electric postheating unit)
DISTRIBUTION
PANEL
PLUG
LON
CONVERTER
REMOTE MONITORING CONTROL CENTRE OF THE PROPERTY
ALARM
OPERATION MODE
CONTROL
MEASUREMENT
ADJUSTMENT
VENTILATION ZONE
INTERNAL ELECTRICAL AND CONTROL CONNECTIONS
POST-HEATING
RADIATOR, WATER
PREHEATING RADIATOR,
LIQUID
SILENCER
SILENCER
PRESSURE
SWITCH
PRESSURE
SWITCH
FIREPLACE/
BOOSTER SWITCH
CARBON DIOXIDE SENSOR (5 AT MOST)
CONTROL PANEL (3 AT MOST)
HUMIDITY SENSOR (2 AT MOST)
DISTRIBUTION
PANEL
PLUG
LON
CONVERTER
REMOTE MONITORING CONTROL CENTRE OF THE PROPERTY
ALARM
OPERATION MODE
CONTROL
MEASUREMENT
ADJUSTMENT
VENTILATION ZONE
INTERNAL ELECTRICAL AND CONTROL CONNECTIONS
POST-
HEATING
RADIATOR,
ELECTRIC
PREHEATING RADIATOR,
LIQUID
SILENCER
SILENCER
PRESSURE
SWITCH
PRESSURE
SWITCH
FIREPLACE/
BOOSTER SWITCH
CARBON DIOXIDE SENSOR (5 AT MOST)
CONTROL PANEL (3 AT MOST)
HUMIDITY SENSOR (2 AT MOST)

VALLOX DIGIT2 SE/VKL/MLV
Code Name Technical data
(factory settings in parentheses) Standard/ Option Code Name Technical data (factory settings in parentheses) Standard/ Option
CO2Carbon dioxide sensor Adjustment range 500…2000 ppm (900) Option
Carbon dioxide control Adjustment interval 1…15 min. (10)
G3 Filter Supply air, extract air Standard
F7 Filter Supply air Standard
PM Damper motor Automatic HR bypass, 24 V, 0.5 W, 2 Nm Standard
H Control panel User interface Standard
R2 Preheating unit Liquid radiator Standard
R1 Post-heating unit a) Water radiator (Digit2 SE MLV VKL) Standard
b) Electric radiator 1.2 kW Standard
(Digit2 SE MLV electric)
HR Heat recovery cell Cross-counter flow, efficiency = 60% Standard
P1 Pressure difference switch Adjustment range 0...500 Pa (320) Option
Pressure guard on the supply
air side
P2 Pressure difference switch Adjustment range 0...500 Pa (320) Option
Pressure guard on the extract
air side
E Extract air fan AC qv = 120 dm3/s (120 Pa) Standard
%RH Humidity sensor Automatic/ Adjustment range 1...99% (99) Option
Humidity control Adjustment interval 1…15 min. (10) (10)
© VALLOX • We reserve the right to make changes without prior notification. 17
PART LIST
Parts list VALLOX DIGIT2 SE (heating/cooling radiator model)
TE1 Temperature sensor Exhaust air temperature Standard
HR antifreeze Adjustment range -6...+15 °C (HR)
TE2 Temperature sensor, Supply air temperature Standard
precooling control Adjustment range +10…30 °C
TE3 Temperature sensor, Outdoor air temperature Standard
preheating control Adjustment range -6…15 °C (preheating)
TE4 Temperature sensor Extract air temperature Standard
TS1 Overheat protector for Automatic +40 °C Included in
the heating unit R1
TS2 Overheat protector for Manually reset, +80 °C Included in
the heating unit R1
S Supply air fan AC qv = 100 dm3/s (100 Pa) Standard
V Water radiator actuator/valve Standard
MV Solenoid valve Not included
in the delivery
KP Circulation pump Not included
in the delivery
TK Fireplace/booster switch function In the controller Standard
Either fireplace or
booster switch function Separate switch Option
SP Damper 2 pcs Air flow operated Standard
LON LON converter Remote monitoring control Option

VALLOX DIGIT2 SE/VKL/MLV
© VALLOX • We reserve the right to make changes without prior notification.
18
DESCRIPTION OF OPERATION/MLV MODEL
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 minimum power. 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 (CO2and %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. It is also possible to select an
automatic search for the humidity content setpoint at 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 base and maximum fan speeds. The base and
maximum fan speeds can be set at the desired level at 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 base fan
speed. This means that fan speed can be raised when necessary, but
not lowered, by the manual, CO2and %RH controls.
Supply air temperature
Supply air temperature can be controlled with either constant temperature
control or cascade control.
Constant temperature control of supply air
The control unit directs the operation of post-heating unit R1 on the
basis of the measuring data given by temperature sensor TE2, aiming
at keeping supply air temperature at the temperature value
(+10...+30 °C) set at control panel H. The cooling function of the MLV
radiator starts when the post-heating radiator has been switched off
and supply air temperature exceeds the setpoint for supply air.
Cascade control of supply air
The control unit directs the operation of post-heating unit R1 on the
basis of the measuring data given by extract air temperature sensor
TE4, aiming at keeping supply air temperature at the temperature value
(+10...+30 °C) set at control panel H.
Heat recovery bypass
Heat recovery is active whenever post-heating is switched on. Automatic
heat recovery bypass is active when post-heating is switched off and
outdoor air temperature exceeds the threshold set (to bet set in the
range of 0... +25 °C). The control centre then controls the operation
of damper motor PM on the basis of the measurement data given by
outdoor air sensor TE3 and extract air temperature sensor TE4 in order
to get as cool supply air as possible in the ventilation zone. However,
heat recovery is active whenever outdoor air temperature falls below
the threshold set, or when outdoor air is warmer than extract air.
Heat recovery antifreeze
Controlling preheating in a liquid-circulating MLV radiator is different
from that in an electric preheating radiator. The liquid radiator switches
on based on the measurement data from outdoor air temperature
sensor TE3. The control centre of the unit starts the pump and opens
the solenoid valve when post-heating is on and outdoor air temperature
goes below the setpoint temperature for preheating. The setpoint must
be lower than the temperature of the liquid coming from the ground
collector. If the power of preheating unit R2 is not enough, the control
centre intermittently stops supply air fan Son the basis of the measurement
data given by temperature sensors TE1 and TE3, preventing the HR cell
from freezing. As soon as the risk passes, the fan restarts automatically.
The threshold temperature (-6...+15 °C) and difference area
(1...10 °C) for antifreeze can be set at control panel H.
Water radiator freezing protection
The control centre of the unit stops fans Sand E, valve Vremains open
and self-actuated dampers SP close based on the measurement data
given by outdoor air temperature sensor TE3 (outdoor air < 0 °C) and
supply air temperature sensor TE2 (supply air < 7 °C), reducing the risk
of water heating unit R1 freezing. A freezing alert appears in the
display of the control panel. The fans restart automatically and dampers
SP open as soon as the risk of freezing passes (supply air > 10 °C).
Overheat protection for the heating unit
Overheat protection thermostats TS1 and TS2 monitor the surface
temperature of heating unit R1. If surface temperature exceeds the
threshold, the overheat protector trips and power supply to the heating
unit is stopped. Overheat protector TS1 is reset automatically, whereas
overheat protector TS2 is reset manually.
Alarms
Pressure difference switches P1 and P2 monitor pressure difference on
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 at
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 antifreeze function of the water-circulating radiator is on,
the contacts 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 sensor faults, the contacts of the
relay close.
Booster or fireplace switch function
An extra switch Smay be connected to the connection box of the
ventilation unit to work as a booster or fireplace switch. The mode of
operation of the switch is selected at control panel H. The booster
switch function raises fan speed to the set maximum 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 a VALLOX LON converter.
See a separate brochure.
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 signal 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)

LOCKING WINGS
4 x ø 160 female
UNIT WEIGHT CA. 71 KG
19
VALLOX DIGIT2 SE/VKL/MLV
© VALLOX • We reserve the right to make changes without prior notification.
INSTALLATION/Ceiling and wall mounting
15
25
DET1
1:2
596
548
458
569 15
25
DET1
Wall mounting
DIGIT2 SE is mounted on the wall with a fixing plate as shown in the adjacent figure.
Wall construction
Pay attention to the wall construction when mounting the unit. Avoid mounting the unit on
a hollow, echoing dividing wall and on a bedroom wall because of sound conduction,
or prevent sound conduction.
Wall mounting of
VALLOX DIGIT2 SE
Top part of wall bracket
Bottom part of wall bracket
Wall bracket mounted
Location of DIGIT2 SE
DIGIT2 SE is mounted in a place where temperature does not fall below +10 ºC. Without
protective casing, the unit has to be located in a place with no acoustic disturbance:
storerooms, utility rooms etc. DIGIT2 SE can also be located in a damp room, but not
in a bathroom next to a sauna bath.
CEILING MOUNTING
VALLOX DIGIT2 SE can be equipped with an optional easy-to-use ceiling mounting plate
(patent pending). The ceiling mounting plate is fixed to the ceiling with M8 thread bars.
Fix the bars so that they stand the weight of the unit, i.e. approximately 71 kg.
The ceiling mounting plate has to be fixed horizontally in order to ensure that the unit will be
straight. The outdoor air duct must be insulated against condensation, also between the unit
and the ceiling mounting plate.
Installation
Lift the unit straight upwards, till the locking wings on the sides of the mounting plate lock
into the side plates of the unit. You can detach the unit from the mounting plate by
releasing the locking wings from the side plates.
To facilitate mounting, you may use a lubricant, such as O-ring grease, in the collar seals.
Mounting accessories include rubber silencers, base plates and nuts. Thread bars are
not included in the delivery.
Ceiling mounting plate before
fastening
back edge
of the side
plate
back edge of the
ceiling mounting
plate
DET 2
3
1
2
1
45
-0.0
+3.0
DIGIT2
23
4
Wing
Wall mounting
bottom bracket
Wall mounting
top bracket
Condensing water
The delivery includes a water seal. By connecting a pipe to the water seal the water
condensing from extract air can be led to a floor drain. The pipe must never be connected
directly to the drain. The condensing water pipe must have a downward slope.
The unit comes with separate instructions for mounting and using the water seal.
17.5
42
30 17.5
32
487.5
450
1616
DISTANCE BETWEEN TOP AND LOWER BRACKET
Space between wall
and unit = 4
After the unit has been
mounted, the space
between the wall and
unit can be shortened by
tightening the top
bracket.
2
Note!
Distance between
straight-line wing
and wall is 2 mm.
1. M8 nut
2. Washer
3. Rubber vibration damper
4. M8 threaded bar
Top edge
of side plate
of unit
lower edge
of ceiling
mounting plate

VALLOX DIGIT2 SE/VKL/MLV
P
IP
R
R
T
MV
Y
E
© VALLOX • We reserve the right to make changes without prior notification.
Vallox Oy • Myllykyläntie 9-11 • FI-32200 Loimaa • Tel [phone] • www.vallox.com
1.09.391E/11.2.2011/PDF
Connection of VKL post-heating radiator to underfloor heating circuit
To minimise the risk of freezing involved in the connection the system has several antifreeze functions.
1. The unit stops if supply air temperature goes below the set temperature and automatically starts as soon as
temperature rises.
2. When the unit stops, the self-actuated dampers (E) close.
3. The electric valve (T) opens when the unit becomes dead.
4. The unit issues an alarm of freezing risk at the controller.
Use of VKL post-heating radiator
• The temperature of heating water shall be adjusted according to the temperature of outdoor air.
• No water must be led into the radiator of the unit until the system has been adjusted for operation and the heating
network has heating on or it has been otherwise ensured that the radiator will not freeze.
• Water circulation in the heating network connected to the unit and the circulation pump must not be stopped during
the heating season.
• The base volume of water flow into the radiator of the unit can be adjusted with valves (R), which can also act as
stop valves (not included in the delivery)..
KP Circulation pump. Size e.g. 0.07 dm3/s,
60 kPa, not included in the delivery
Because of the risk of condensing the pump
should be suitable for pumping liquid colder
than the ambient temperature (e.g.
Grundfors UPS-25-60 180 model K).
MV Solenoid valve, not included in the delivery.
The valve has to be suitable for the liquid in
the ground collector .
T Valve, included in the unit delivery
Y One-way valve, not included in the delivery
(as low pressure loss as possible)
E Self-actuated dampers, included in the
delivery
IP Air bleeder (located after the pump and at the
highest point in the system).
Connection of MLV preheating/cooling radiator
The radiator is connected to the pipe coming from the ground collector. When the requirements for starting the heating
or cooling function are met, the control function of the unit opens the solenoid valve (MV) and starts the pump (KP).
Observe the frost resistance of the liquid used in the ground collector. Connection pipes of the MLV radiator have to be
insulated against condensation. Note! Because of the risk of humidity damage, supply air temperature in a duct with no condensation
insulation should not go below +16...20 °C.
Other connections
Heat can be conducted to the post-heating radiator of DIGIT2 SE VKL in other ways than described above. It is possible
to build a separate circuit for the radiator if higher power is desired, or the risk of freezing can be eliminated by using
non-freezing heat transfer solution. For more information, see the instructions for VALLOX VKL connections in internet,
www.vallox.coms.
PIPE CONNECTIONS
RADIATOR HEATING
HEAT PUMP
UNDERFLOOR HEATING
GROUND COLLECTOR
Heating water
adjustment