10
ELECTRIC
AL CONNECTIONS
INTERNAL ELECTRICAL CONNECTION (3721-1)
Freezing level adjustment
M
1 2 3
Programming connector
VAK remote
monitoring
E/I
E/O
Leave the signal LED of the
external control panel or cooker
hood disconnected.
Also disconnect the short circuit
link between connectors 3 and 5
from the female side of the
control panel connector.
When remote
monitoring is used
Post-heating control
PWM level adjustment
4 5 6 7 8 9
1
2
3
4
5
LIN
E
N
EU
TR
A
L
SLI
SN
I
SLO
SN
O
SF
L
SF
N
EF
L
EF
N
FS
O
FS
I
A
H
L
A
H
N
PH
L
PH
N
23
0V
50
H
z
B
L1
B
L
B
N
E/I
E/O
1
2
3
4
*Fan neutral to FSI when
the fireplace switch is used
LE
D
34
80
60
0
1234
5
123
4
5
Error relay
Fireplace switch
Safety / door switch
Damper motor 230 VAC
Protective earth to a separate block
Supply
air fan
Extract
air fan
Extract air NTC
Outdoor air NTC
External control panel or cooker hood
9. GND/
8. Supply fan PWM
7. Supply fan tacho
6. GND/
5. Extract fan PWM
4. Extract fan tacho
3. GND/
2. 11.2Vdc/+
1. Control signal S
DIP switch
1. Post-heating
2. Additional heating
3. Type of the unit
4. Extra
Up
Electric
Electric
Bypass
Down
VKL
MLV
Supply fan stop
An external 0-10 V DC voltage supply
can be connected to the S and GND signals
of the control signal for fan control.
DIP switch
ERROR RELAY
90°
C
130°
C
R1
T1
T2
Post-heating:
electric radiator
900W
1
2
3
4
LE
D
-
+
S
Supply air to the
apartment NTC
Exhaust air NTC
Supply air from the cell NTC
LIN
E:
Ph
ase
N
EUT
RA
L:
N
eu
tra
l
SL
I:
Sa
fe
ty s
w
itc
h p
ha
se f
ee
d
SN
I:
Sa
fe
ty s
w
itc
h n
eu
tra
l f
ee
d
SL
O
:
Sa
fe
ty s
w
itc
h p
ha
se t
o t
he c
irc
uit b
oa
rd
SN
O
:
Sa
fe
ty s
w
itc
h n
eu
tra
l t
o t
he c
irc
uit b
oa
rd
SF
L:
Ph
as
e t
o s
up
ply a
ir f
an
SF
N
:
N
eu
tra
l t
o s
up
ply a
ir f
an
EF
L:
Ph
as
e t
o e
xtr
ac
t a
ir f
an
EF
N
:
N
eu
tra
l t
o e
xtr
ac
t a
ir f
an
FS
O
:
Fir
ep
lac
e s
w
itc
h f
ee
d
FS
I:
Fir
ep
lac
e s
w
itc
h ou
tp
ut
AH
L:
Po
st-
he
atin
g p
ha
se
AH
N
:
Po
st-
he
atin
g ne
utr
al
PH
L:
Ad
dit
io
na
l h
ea
te
r p
ha
se
PH
N
:
Ad
dit
io
nal
he
ater
ne
utr
al
BL
:
D
am
pe
r m
oto
r p
ha
se A
BL
1:
D
am
pe
r m
oto
r p
ha
se B
BN:
D
amp
er mo
tor
n
eu
tra
l
E/I
:
Err
or r
ela
y f
eed
E/O
:
Err
or r
ela
y o
utp
ut
*W
ithou
t t
he
fi
rep
lac
e s
w
itc
h, t
he
fa
n n
eu
tra
l i
s c
on
ne
cte
d t
o E
FN
W
ith t
he fi
re
pla
ce s
w
itc
h, t
he f
an
ne
utr
al i
s m
ov
ed t
o F
SI
