GB-4
D
GB
F
NL
I
E
Burner control unit BCU connection diagram
12
34
56
78
91
01
11
21
31
41
51
6
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
PE
N (L2)
L1 (L1)
F1
F2
V2
V1
WF
24
V
0
V
ϑ
ϑ
IZ
PE
BCU 300:THP-G
DG
max. 2 A,
253 V
max. 5 A,
253 V
N
F1 T 8A H
F2 T 3,15A H
IEC 60127-2/5
N
AC/DC
ϑ
35453625
▷
In order to ensure post-cooling, the heater con-
stantly requires 230 V AC.
Connecting the room thermostat for “Heating”
and “Controlled air flow” mode
▷
Use a room thermostat with a hysteresis of ± 1°C.
It switches on if the room temperature is 1°C
less than the set temperature and switches off
again once the room temperature is 1°C more
than the set temperature.
▷
Do not directly connect the room thermostat to
terminals 1 and 3.
5
Connect the terminals for Controlled air flow
ϑ
and Heating
ϑ
.
31
32
29
30
28
31
32
29
30
28
0
26
27
28
24
25
23
0
26
27
28
24
25
23
230 V ~
230 V ~
+24 V =/~
+24 V =/~
+24 V =/~
+24 V =/~
