Wiring Diagram; External Switching - LK Systems Electric Boiler-4.5 Assembly Instructions Manual

External switching/room thermostat
The boiler can be blocked by external equipment,
e.g. room thermostat with potential-free opening
contact suitable for 230 V/10A. Connection is car-
ried out at terminals 1 & 3 on the boiler connection
terminal.
1 3
P X N N
Note! If the boiler is wired to supply which is fused
higher than 10 A the enclosed automatic fuse must be
used. Connection wires and the DIN-rail with its termi-
nal blocks must be installed as shown below.
10 A
L3 L2 L1
Assembly instructions | LK Electric Boiler - 4,5

Wiring diagram

4,5 kW / 400V 3N~ / 6,5 A
Feed cable: 5 x 1,5 mm²
Protection fuse: 3 x 10A
The boiler operates in two power steps, 2,25 and
4,5 kW.
At 2,25 kW, only phases L1 and L2 (5, 6 A) are
loaded.
6
9
5
4
N
N
N
1 3 P X N N L3 L2 L1
1 2
Delivery configuration, 4,5 kW / 400V 3N~ / 6,5 A

1. External switching

2. Jumper, for 1,5 and 3kW connection
3. Connection terminal
4. Suppressor capacitor
5. Circulation pump
6. Overheating (maximum safe temperature)
protection
7. Thermostat
8. Electric cartridge
9. Control switches
10. Alarm indication, overheating (maximum
safe temperature) protection triggered
11. On/off indicating light, goes on when vol-
tage is supplied to the boiler
12. Contacts
10- 60°C
T
7
80°C
8
T
4.5 kW
12
42 41 L4 T4 1
11
22 L3 T3
32 31 2
24
21
32 22 21 L1 T2 3
31
L1 T1
A1
ALARM N
A2
OPERATION
N
10
N
11 12
3
EN.33.C.111.1804
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