LK Electric Boiler -, Design LK Electric Boiler, kw is a wall-mounted electric boiler, intended primarily for low-temperature heating systems, e.g. under floor heating. LK Electric Boiler, 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 overheating (maximum safe temperature) protection Control switch Circulation pump, Grundfos UPM Auto L - Expansion vessel Pressure gauge Thermometer Safety valve,, bar Automatic air bleeding valve Bypass valve The electric boiler is t fitted with a water heater, this is installed separately. Function/Requirements The boiler output meets the heat requirements for up to 9 m² of living space, depending on the insulation and ventilation. Depending on the connection the boiler can supply,,,, or, 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. Assembly The boiler is mounted to the wall, or in a cabinet. The boiler dimensions x 7 x mm (W x H x D) mean that it can be installed in most kitchen cabinets. Pipe installation Installation should be carried out according to the applicable regulations and standards. The boiler should be assembled indoors, mounted to a wall or similar with the pipe connections underneath. The ambient temperature must t exceed C. The gap between the underside of the boiler and the surface beneath it must be at least mm to enable electric cartridges to be replaced, if necessary. Hard, calciferous water is t suitable for use with this heating system. To avoid corrosion damage the ph value should t 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 t occur without a repeat inspection of the installation. A counter torque wrench should be used during connection to avoid damaging the internal piping. (9)
Installation - system outline Below is a system outline. Units should always be installed according to regulations and standards. When the system is filled with water it should be air-bled at the electric boiler and the manifolds. Flow - circulation pump The flow must be secured. The boiler requires a flow which produces a maximum Δt of C (The temperature difference between the boiler s flow pipe and return).. LK Electric Boiler -,. Filling valve/drain valve. Manifolds under floor heating. Under floor heating system Expansion vessel Expansion vessel: litres, delivery pre-pressure, bar. The vessel supplies a heating system volume of 7 litres at 6 C and a static pressure of 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 glycol mixed. Connection output (kw),,,,,,, 6, Recommended flow (litres/min) The diagram shows the maximum permissible pressure drop in the heating system for the capacity of the circulation pump to produce a Δt of C at the maximum pump speed, with the dial positioned at III. (kpa) Pressure resistance 6 8 Flow (l/min) Bypass valve The 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. Safety valve The safety valve,, bar, is mounted to the boiler, the blow-off pipe flows into a drip pan in the boiler cabinet. Filling - air bleeding The heating system should be filled with water up to a pressure higher than the pre-pressure of the expansion vessel,, bar. bar is recommended.. Isolation valve supply and return. By-pass valve, accessible after the protective plug has been unscrewed. (9)
Pipe installation Circulation pump Delivery setting: Constant pressure curve. If parts of the heating system do t get hot, this can be changed to Constant pressure curve. Selecting a higher curve increases energy consumption and operating costs. Push button 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. - % - % - 7 % 7 - % Pressing the button displays the pump setting for sec before the pump returns to rmal display. PROP. PRESSURE: CURVE PROP. PRESSURE: CURVE PROP. PRESSURE: CURVE If the button is depressed for sec, the pump switches to setup mode and the LEDs flash. In setup mode, any one of curves can be selected by turning the button. When the button has been released for sec, the pump returns to operating mode, the LEDs stop flashing and the selected curve becomes active. A lit red LED indicates an alarm or warning. Indication Fault Status Measure Motor blocked Red + fourth yellow Red + third yellow Red + second yellow Low voltage Electrical fault Pump tries to restart at. sec intervals Warning only, pump continues to operate Pump stopped Release motor/ impeller or wait Check voltage to pump Check voltage/replace pump A button lock prevents accidental adjustments to the pump settings. The button can be locked/unlocked by depressing the button for seconds. After seconds, all the LEDs will flash quickly to indicate that the lock is locked/unlocked. Pump capacity p [kpa] H [m] CONST. PRESSURE: CURVE CONST. PRESSURE: CURVE CONST. PRESSURE: CURVE CONST. CURVE: KURVA CONST. CURVE: KURVA CONST. CURVE: KURVA CONST. CURVE: KURVA....6.8....6.8....6.8 Q [m³/h]. P......6.7.8 Q [l/s] [W]....6.8....6.8....6.8 Q [m³/h] (9)
Electric installation Electric installation should be carried out in accordance with the applicable regulations, under the supervision of an authorized electrician., kw / V~ / 6, A P X N N L L L The boiler must t 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 t exceed C. Feeding Feed cable: x, mm² Protection fuse: A Jumper: N-X, kw / V N~ /,6 A P X N N L L L Feed cable: x, mm² Protection fuse: x A, kw / V N~ / 7, A P X N N L L L Feed cable: x, mm² Protection fuse: x A Jumper: N-X The boiler works with two outputs,, och kw.. Connection terminal. Electric shock protection. Kck-out hole (cabling from wall). Cable bushes With a single or two phase connection t all of the boiler s main fuses are stressed. Other large current consumers should therefore be connected to the phase lines which are t stressed by the boiler. Alternative connections The boiler is connected according to (some of) the alternatives below, depending on the desired output., kw / V N~ / 6, A P X N N L L L Feed cable: x, mm² Protection fuse: x A The boiler works with two outputs,, och, kw. At, kw only phases L and L (,6A) are stressed. Note! Intervention in the boiler which requires tools may only be carried out under the supervision of an authorized installer! (9)
External switching/room thermostat The boiler can be blocked by external equipment, e.g. room thermostat with potential-free opening contact suitable for V/A. Connection is carried out at terminals & on the boiler connection terminal. P X N N L L L Wiring diagram, kw / V N~ / 6, A Feed cable: x, mm² Protection fuse: x A The boiler operates in two power steps,, and, kw. At, kw, only phases L and L (, 6 A) are loaded. 6 8 C T - 6 C T 7 L T 8. kw L T Note! If the boiler is wired to supply which is fused higher than A the enclosed automatic fuse must be used. Connection wires and the DIN-rail with its terminal blocks must be installed as shown below. 9 N N L T L T A ALARM N A OPERATION N N N P X N N L L L Delivery configuration,, kw / V N~ / 6, A. External switching. Jumper, for, and kw connection. Connection terminal. Suppressor capacitor. Circulation pump 6. Overheating (maximum safe temperature) protection 7. Thermostat 8. Electric cartridge 9. Control switches. Alarm indication, overheating (maximum safe temperature) protection triggered. On/off indicating light, goes on when voltage is supplied to the boiler. Contacts A (9)
Alternative connection, kw / V N~ / 9,6 A Feed cable: x mm² Protection fuse: A Mount DIN-rail, -pole terminal block with end plate, and connect cables supplied as shown in wiring diagram below. Operation and maintenance 6 bar C 8 Min., Bar Max, Bar 7 6 ALARM OPERATION 6 Tillse att pannan är vattenfylld innan den startas Boiler must be filled with water before start Alternative connection,, kw / V ~ / 9,6 A Control panel. Thermometer. Mameter. Resetting overheating (maximum safe temperature) protection. Thermostat/temperature setting. Control switches 6. On/off indicating light, goes on when voltages is supplied to the boiler 7. Indication, overheating (maximum safe temperature) protection triggered Inspect, together with installer, after the installation, 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 operation. 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! 6 (9)
Temperature setting Set the thermostat to a suitable temperature. The maximum temperature for concrete floor joists is approx. - C and for wooden joists approx. - 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) protection on the boiler is triggered when the boiler temperature exceeds 8. The protection is restored on the control panel, when the boiler temperature has fallen below 6 C. Inform the installer! When resetting push overheat protection button hard with a sharp object. Note! Always check the reason to overheating! Thermometer The thermometer shows the boiler s feed temperature. Expansion vessel The pre-pressure of the expansion vessel should be inspected annually, see the data plate attached to the vessel. Water pressure in the system The boiler cover must be removed in order to check the water pressure. The pressure gauge shows the pressure in the heating system. Air bleeding Air 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 freezing If the unit should be switched off for longer periods of time care should be taken that it does t 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. Alternatively, the heating system can be filled with an appropriate amount of anti-freeze. The boiler must t be in operation if any part of the heating system is suspected of being frozen. Inform the installer! Draining Before 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 Check regularly that there is sufficient water in the system. The pressure gauge should display, -, 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 volume. Check the water pressure in the system regularly! 7 (9)
Troubleshooting Intervention 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 Measures On/off indication is off, there is heat in the heating system. Alarm light is on. No or insufficient heat. Group fuses for boiler are triggered. The electric boiler is currentless. Circuits switched off. The electric boiler is blocked externally. Overheating (maximum safe temperature) protection is triggered. Thermostatic valves on the heating system or boiler thermostat set at too low temperature. Faulty adjustment of bypass valve. The electric cartridge is broken. Check the fuses. Check that the main and control switches are on. Check if the boiler is blocked by external switching/room thermostat. 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 (maximum safe temperature) protection is pushed in when the boiler temperature falls below 6 C (push the button hard for reset). Inspect and adjust. Inspect and adjust. 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 7 6. Cable bushes. Automatic bleeding valve. Expansion vessel. Sensor clip, thermometer bulb. Boiler vessel of stainless steel with electric cartridge, insulated 6. Circulation pump 7. Electric-shock protection over electric cartridge cable connections 8. Bypass with shut-off valves 9. Flow pipe, ¾ male thread. Return connection, ¾ male thread. Collection vessel, waster water from safety valve. Safety valve. Electric-shock protection. Kckouts for cables, where these come from the wall 8 9 8 (9)
Dimensional drawings 6 7 9 7 89 Technical data Article. 6 Height Width Depth Weight Output Voltage Current 7 mm mm mm 7 kg, kw V AC N~, Hz 6, A Protection Class IP Power circulation pump Volume Volume expansion vessel Calculation pressure Test pressure Safety valve - W, litres litres, bar,6 bar, bar Calculation temperature 8 C Control temperature Manufactured in accordance with: Fuse -6 C AFS 999: 8 97/ EG article x A Without cover Condensing boiler Low-temperature B boiler Cogeneration space heater Combination heater Rated heat output P rated kw Useful heat output at rated heat output Energy class Seasonal space heating energy efficiency boiler boiler with UTK P, kw Useful efficiency η 9,7 % Auxiliary electricity consumption in standby mode η s η s D 6 8 % % P SB,9 kw Standby heat loss P stby,7 kw 7 Material recycling After dismantling the boiler must be recycled. The insulation is removed and recycled as insulation. Boiler Body recycled as scrap steel. Electrical and electronic components are sorted as electronic waste. Boiler casing recycled as plastic. With cover LK Systems AB, Box 66, 6 6 Bromma, Sweden www.lksystems.se 9 (9)