Design - LK Systems · 2016. 9. 1. · LK Electric Boiler 4,5 kW is a wall-mounted elec-tric boiler, intended primarily for low-temperature heating systems, e.g. under floor heating.

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Pipe installationInstallation should be carried out according to the applicable regulations and standards.

The boiler should be assembled indoors, moun-ted to a wall or similar with the pipe connections underneath.

The ambient temperature must not exceed 30°C.

The gap between the underside of the boiler and the surface beneath it must be at least 300 mm to enable electric cartridges to be replaced, if neces-sary.

Hard, calciferous water is not suitable for use with this heating system. To avoid corrosion damage the pH value should not be too low.

The blow-off pipe from the electric boiler safety valve flows into a drip tray in the boiler cabinet.

The installation inspection should be carried out according to the applicable regulations on a unit with a sealed expansion vessel, before the unit is operated. The inspection should be conducted by a suitably qualified person. The replacement of parts and the expansion vessel must not occur without a repeat inspection of the installation.

A counter torque wrench should be used during connection to avoid damaging the internal piping.

DesignLK Electric Boiler 4,5 kW is a 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) protection• Control switch • Circulation pump, Grundfos UPM3 Auto L

15-50• Expansion vessel • Pressure gauge • Thermometer • Safety valve, 2,5 bar • Automatic air bleeding valve • Bypass valve

The electric boiler is not fitted with a water heater, this is installed separately.

Function/RequirementsThe boiler output meets the heat requirements for up to 90 m² of living space, depending on the insulation and ventilation. Depending on the con-nection the boiler can supply 1,5, 2,25, 3 or 4,5 kW. The boiler is controlled by an in-built thermostat. If necessary, the boiler can also be controlled by an external thermostat, for more information please refer to the heading “External switching/room thermostat”.

AssemblyThe boiler is mounted to the wall, or in a cabinet.

The boiler dimensions 420 x 700 x 200 mm (W x H x D) mean that it can be installed in most kitchen cabinets.

LK Electric Boiler - 4,5

EN.33.C.111.1804

Assembly instructions | LK Electric Boiler - 4,5

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EN.33.C.111.1804


When the system is filled with water it should be air-bled at the electric boiler and the manifolds.

Flow - circulation pumpThe flow must be secured. The boiler requires a flow which produces a maximum Δt of 10°C (The temperature difference between the boiler’s flow pipe and return).

Connection output (kW) Recommended flow (litres/min)1,5 2,22,25 3,23,0 4,34,5 6,5

The diagram shows the maximum permissible pressure drop in the heating system for the ca-pacity of the circulation pump to produce a Δt of 10°C at the maximum pump speed, with the dial positioned at III.

2 4 6 8 1000

20

25

30

(kPa) Pressure resistance

Flow(l/min)

Bypass valveThe circulation pump may be damaged if operated if it is applied to closed valves. The bypass valve reduces this risk. With the pump at maximum speed, position III, the adjustment 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 outlineBelow 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 floor heating system

Expansion vesselExpansion vessel: 2 litres, delivery pre-pressure 1,5 bar.

The vessel supplies a heating system volume of 70 litres at 60°C and a static pressure of 5 metres.

At lower static heights or temperatures the vessel supplies a greater volume.

If glycol mix is used the capacity of the expansion vessel is reduced in relation to the amount of gly-col mixed.

Safety valveThe safety valve, 2,5 bar, is mounted to the boiler, the blow-off pipe flows into a drip pan in the boiler cabinet.

Filling - air bleedingThe heating system should be filled with water up to a pressure higher than the pre-pressure of the expansion vessel, 1,5 bar. 2 bar is recommended.

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Pipe installationCirculation pumpDelivery setting: Constant pressure curve 1. If parts of the heating system do not get hot, this can be changed to Constant pressure curve 2. Selecting a higher curve increases energy con-sumption and operating costs.

Push but-ton

LEDs

In operating mode, the first LED lights up green, and between one and four LEDs light up yellow. The yellow LEDs indicate the operating capacity of the pump.

0 - 25 %

25 - 50 %

50 - 75 %

75 - 100 %

Pressing the button displays the pump setting for 2 sec before the pump returns to normal display.

PROP. PRESSURE: CURVE 1



CONST. PRESSURE: CURVE 1



CONST. CURVE: KURVA 1




If the button is depressed for 2 sec, the pump switches to setup mode and the LEDs flash. In setup mode, 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-low

Low volt-age

Warning only, pump continues to operate

Check volt-age to pump

Red +

second yellow

Electrical fault

Pump stopped

Check volt-age/replace pump

A button lock prevents accidental adjustments to the pump settings. The button can be locked/un-locked by depressing the button for 10 seconds. After 10 seconds, all the LEDs will flash quickly to indicate that the lock is locked/unlocked.

Pump capacity

0

1

2

3

4

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 Q [m³/h]

5

[m]H

0

10

20

30

40

50

[kPa]p

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 Q [l/s]

0

5

10

15

20

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 Q [m³/h]

25

30

35[W]P1

EN.33.C.111.1804

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EN.33.C.111.1804


1,5 kW / 230 V~ / 6,5 A

1 3 X L3 L2 L1P N N

Feed cable: 3 x 1,5 mm² Protection fuse: 10 AJumper: N-X

2,25 kW / 400V 2N~ / 5,6 A

1 3 X L3 L2 L1P N N

Feed cable: 4 x 1,5 mm²Protection fuse: 2 x 10 A

3,0 kW / 400V 2N~ / 7,5 A

1 3 X L3 L2 L1P N N

Feed cable: 4 x 1,5 mm²Protection fuse: 2 x 10 AJumper: N-XThe boiler works with two outputs, 1,5 och 3 kW.

4,5 kW / 400V 3N~ / 6,5 A

1 3 X L3 L2 L1P N N

Feed cable: 5 x 1,5 mm²Protection fuse: 3 x 10AThe boiler works with two outputs, 2,25 och 4,5 kW.At 2,25 kW only phases L1 and L2 (5,6A) are stressed.

Note! Intervention in the boiler which requires tools may only be carried out under the supervision of an authorized installer!

Electric installationElectric 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 not exceed 30°C.

Feeding

4

3

1

2

1. Connection terminal 2. Electric shock protection 3. Knock-out hole (cabling from wall) 4. Cable bushes

With a single or two phase connection not all of the boiler’s main fuses are stressed. Other large cur-rent consumers should therefore be connected to the phase lines which are not stressed by the boiler.

Alternative connectionsThe boiler is connected according to (some of) the alternatives below, depending on the desired out-put.

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EN.33.C.111.1804


Wiring diagram4,5 kW / 400V 3N~ / 6,5 AFeed cable: 5 x 1,5 mm²Protection fuse: 3 x 10AThe 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 L1P

N

N N

N

N

N

11

21

31

12

2224

32

42

32

22

41

31

21

L4

L3

L1

T4

T3

T2

L1 T1

80°C

10- 60°C

TT

1

2

3

4.5 kW

ALARMOPERATION

A1A2

NN

11

1 2

3

45

67

8

9

10 12

Delivery configuration, 4,5 kW / 400V 3N~ / 6,5 A

1. External switching2. Jumper, for 1,5 and 3kW connection3. Connection terminal4. Suppressor capacitor5. Circulation pump6. Overheating (maximum safe temperature)

protection7. Thermostat 8. Electric cartridge9. Control switches10. Alarm indication, overheating (maximum

safe temperature) protection triggered11. On/off indicating light, goes on when vol-

tage is supplied to the boiler12. Contacts

External switching/room thermostatThe 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 L1P 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

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EN.33.C.111.1804


Operation and maintenance

Tillse att pannan är vattenfylld innan den startasBoiler must be filled with water before start

Min. 0,5 BarMax 2,5 Bar

10°

20°30°

40°

50°

60°

1

0 4

3

2

bar °C

120

8060

40

20

0

100

7

2

3

6

4 5

1

Control panel1. Thermometer2. Manometer3. Resetting overheating (maximum safe tem-

perature) protection 4. Thermostat/temperature setting5. Control switches6. On/off indicating light, goes on when vol-

tages is supplied to the boiler7. Indication, overheating (maximum safe

temperature) 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 vessel, which accrues waste water from the safety valve, regularly. This is important in a new system!

Alternative connection4,5 kW / 230 V 1N~ / 19,6 AFeed cable: 3 x 4 mm²Protection fuse: 20 A

Mount DIN-rail, 3-pole terminal block with end plate, and connect cables supplied as shown in wiring diagram below.

ALARMOPERATION

Alternative connection , 4,5 kW / 230 V ~ / 19,6 A

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EN.33.C.111.1804


Air bleedingAir may remain in the system for some time after installation, which is the why water may need to be replenished.

Measures to counter the risk of freezingIf the unit should be switched off for longer peri-ods of time care should be taken that it does not freeze. All of the water in the unit must be drained out if there is a risk of freezing, and the power supply to the boiler should be switched off. Alter-natively, the heating system can be filled with an appropriate amount of anti-freeze.

The boiler must not be in operation if any part of the heating system is suspected of being frozen. Inform the installer!

DrainingBefore the water is drained out of the system the electric boiler should be switched off.

Always switch off the power to the boiler before:• Water is drained out• Intervention or maintenance work is carried out inside the boiler, or any other units supplied with electricity from the boiler

Temperature settingSet the thermostat to a suitable temperature.

The maximum temperature for concrete floor joists is approx. 35-40°C and for wooden joists approx. 40-45°C. The desired temperature varies according to the time of year.

Safety valveThe safety valve should be exercised regularly to maintain the safety function.

Overheating (maximum safe temperature) protectionThe overheating (maximum safe temperature) pro-tection on the boiler is triggered when the boiler temperature exceeds 80°. The protection is restored on the control panel, when the boiler temperature has fallen below 65°C. Inform the installer! When resetting push overheat protection button hard with a sharp object.

Note! Always check the reason to overheating!

ThermometerThe thermometer shows the boiler’s feed tempe-rature.

Expansion vesselThe pre-pressure of the expansion vessel should be inspected annually, see the data plate attached to the vessel.

Water pressure in the systemThe boiler cover must be removed in order to check the water pressure. The pressure gauge shows the pressure in the heating system.

Check regularly that there is sufficient water in the system. The pressure gauge should display 0,5 - 2,0 bar.

The water volume changes with the temperature, which in turn affects the pressure. The higher the temperature, the greater the volume and pressure. The expansion vessel gathers changes in the vo-lume.

Check the water pressure in the system regularly!

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EN.33.C.111.1804


TroubleshootingIntervention in the boiler which requires the use of tools should be carried out by an authorized electrician. Begin all troubleshooting tasks by looking at the status indicators, see the Control panel section.

Error Possible cause MeasuresOn/off indication is off, there is no heat in the heating system.

The electric boiler is currentless. Check the fuses.Circuits switched off. Check that the main and control switches are on.The electric boiler is blocked externally. Check if the boiler is blocked by external switching/room ther-

mostat.Alarm light is on. Overheating (maximum safe temperature)

protection is triggered.If the overheating (maximum safe temperature) protection goes off, the function should be controlled at the circulation pump and valves. During resetting the button on the overheating (maxi-mum safe temperature) protection is pushed in when 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 between the outward side on the contacts, and earth. Inform the installer!

Intervention in the boiler, which requires the use of tools, must only be carried out under the supervision of an authorized installer!

Drawings

91410

6

5

7

1

11

8

12

3

2

4

213

1. Cable bushes 2. Automatic bleeding valve 3. Expansion vessel 4. Sensor clip, thermometer bulb 5. Boiler vessel of stainless

steel with electric cartridge, insulated

6. Circulation pump 7. Electric-shock protection over

electric cartridge cable con-nections

8. Bypass with shut-off valves 9. Flow pipe, ¾” male thread 10. Return connection, ¾” male

thread 11. Collection vessel, waster

water from safety valve 12. Safety valve 13. Electric-shock protection 14. Knockouts for cables, where

these come from the wall

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EN.33.C.111.1804


Technical dataArticle no. 623 12 25Height 700 mmWidth 420 mmDepth 200 mmWeight 17 kgOutput 4,5 kWVoltage 400V AC 3N~, 50 HzCurrent 6,5 AProtection Class IP 21Power circulation pump 2-34 WVolume 5,5 litresVolume expansion vessel 2 litresCalculation pressure 2,5 barTest pressure 3,6 barSafety valve 2,5 barCalculation temperature 80 °CControl temperature 10-60°CManufactured in accor-dance with:

AFS 1999:4§8 97/23 EG article 3

Fuse 3 x 10A

Condensing boiler noLow-temperature noB1 boiler noCogeneration space heater noCombination heater noRated heat output Prated 5 kWUseful heat output at rated heat output

P4 4,5 kW

Energy class DSeasonal 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 recyclingAfter dismantling the boiler must be recycled. The insulation is removed and recycled as insula-tion. Boiler Body recycled as scrap steel. Electrical and electronic components are sorted as electro-nic waste. Boiler casing recycled as plastic.

Dimensional drawings

150 189

224

515

173

392

17150

50

640

Without cover

200

700

420

With cover

LK Systems AB, Box 66, 161 26 Bromma, Sweden | www.lksystems.se

Design - LK Systems · 2016. 9. 1. · LK Electric Boiler 4,5 kW is a wall-mounted elec-tric boiler, intended primarily for low-temperature heating systems, e.g. under floor heating.

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