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5 (9)

EN.33.C.111.1804

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.

1 3

X

L3 L2 L1

P

N

N N

N

N

N

11

21

31

12

22
24
32

42

32

22

41

31

21

L4

L3

L1

T4

T3

T2

L1

T1

80°C

10- 60°C

T

T

1

2

3

4.5 kW

ALARM

OPERATION

A1

A2

N

N

11

1

2

3

4

5

6

7

8

9

10

12

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

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

X

L3 L2 L1

P

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

Summary of Contents for Electric Boiler-4.5

Page 1: ...wall mounted elec tric boiler intended primarily for low temperature heating systems e g under floor heating LK Electric Boiler 4 5 kW is delivered as a complete unit The boiler is ready for use once the water and electricity are connected The boiler includes Thermostat Overheating maximum safe temperature protection Indication power on and triggered overhea ting maximum safe temperature protectio...

Page 2: ...stment valve should be open by at least half a revolution 1 2 1 Isolation valve supply and return 2 By pass valve accessible after the protective plug has been unscrewed Installation system outline Below is a system outline Units should always be installed according to regulations and standards 4 1 2 3 1 LK Electric Boiler 4 5 2 Filling valve Drain valve 3 Manifolds under floor heating 4 Under flo...

Page 3: ...de any one of 10 curves can be selected by turning the button When the button has been released for 10 sec the pump returns to operat ing mode the LEDs stop flashing and the selected curve becomes active A lit red LED indicates an alarm or warning Indication Fault Status Measure Red fourth yellow Motor blocked Pump tries to restart at 1 5 sec intervals Release motor impeller or wait Red third yel ...

Page 4: ...ied out under the supervision of an authorized installer Electric installation Electric installation should be carried out in accor dance with the applicable regulations under the supervision of an authorized electrician The boiler must not be connected to the electrical supply before it is filled with water The boiler should be preceded by all pole circuit switches The ambient temperature must no...

Page 5: ...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 External switching room thermostat The boiler can be blocked by external equipment e g room thermostat ...

Page 6: ...perature protection triggered Inspect together with installer after the instal lation that the unit is in a satisfactory condition Have the installer demonstrate how the unit works and should be handled The boiler and the heating system must be filled with water before the circuit switch is set to on The boiler cover should be assembled during ope ration Note Monitor the amount of water in the ves...

Page 7: ...ox 35 40 C and for wooden joists approx 40 45 C The desired temperature varies according to the time of year Safety valve The safety valve should be exercised regularly to maintain the safety function Overheating maximum safe temperature protection The overheating maximum safe temperature pro tection on the boiler is triggered when the boiler temperature exceeds 80 The protection is restored on th...

Page 8: ... the boiler temperature falls below 65 C push the button hard for reset No or insufficient heat Thermostatic valves on the heating system or boiler thermostat set at too low temperature Inspect and adjust Faulty adjustment of bypass valve Inspect and adjust Group fuses for boiler are triggered The electric cartridge is broken Inspect the electric cartridge by testing it in isolation Measure betwee...

Page 9: ...iler no Cogeneration space heater no Combination heater no Rated heat output Prated 5 kW Useful heat output at rated heat output P4 4 5 kW Energy class D Seasonal space heating energy efficiency boiler boiler with UTK ηs ηs 36 38 Useful efficiency η4 39 7 Auxiliary electricity consumption in stand by mode PSB 0 019 kW Standby heat loss Pstby 0 037 kW Material recycling After dismantling the boiler...

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