TERMO ELECTRIC BOILERS MANUAL OSO TERMO RS -E OSO TERMO PLUS - E OSO TERMO PTV E

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1 TERMO ELECTRIC BOILERS MANUAL OSO TERMO RS -E OSO TERMO PLUS - E OSO TERMO PTV E B C

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3 Contents 1. Introduction Applicable documents Retention of documents Features and benefits Termo concept Outside temperature sensor Heating curves Termo E Range Water heater temperature sensor Termo E range Key to TERMO boilers RS - E Plus - E PTV - E Expansion Vessel Characteristics (Plus And PTV Boilers) Supply Characteristics 240V N ~ 50/60 Hz Installation Content included in delivery Standards & Regulations Physical installation Select position for boiler Fitting the boiler hanging bracket Recommendations for handling Removing/fixing the front and top case Plumbing & Heating installation & commissioning Installation Ancillary components Connection to the electrical mains supply Room thermostat, temperature probes and pumps connection Connect room thermostat/programmer Fit external temperature sensor Fitting hot water cylinder temperature sensor (PTV-E only) Fitting pump connections and expansion vessel (RS E only) Setting up Boilers Control Panel (including fault finding indicators) Choose type of heating (radiator or under floor heating) Hybrid Systems combining radiator and UFH Activating system and programming central heating Heating curves explained To set correct curve Setting internal temperature Programmable room thermostats & setting variable internal temperatures Domestic hot water priority Protection from freezing Domestic hot water Central heating Recommended annual checks (all boilers) Central heating controls advanced menu...20

4 6.1. Domestic hot water advanced menu (control panel type 2) Fault finding guide After Sales service information Cascade power limiter OSO Hotwater UK Ltd Appendices Appendix 1 - Termo RS with space heating and water heating Schematic diagram Termo RS - E Wiring diagram Termo RS - E S-Plan wiring layout Termo RS -E Appendix 2 - Termo RS Space heating only Schematic diagram Termo RS - E Wiring diagram Termo RS-E S-Plan wiring layout Termo RS-E Appendix 3 - Termo PLUS E Schematic diagram Termo plus-e Wiring diagram Termo plus-e S-Plan wiring layout Appendix 4 Termo PTV E Schematic diagram Termo PTV-E Wiring diagram Termo PTV-E S- Plan wiring layout Termo PTV-E...37

5 Terminology used in this manual The central heating boiler water circuit is called primary The domestic hot water is called secondary (dhw) 1. Introduction Thank you for purchasing the Oso Termo E electric central heating boiler. To ensure a correct and safe installation and economical use, please read these instructions thoroughly before installation Applicable documents The following additional documents are provided with the appliance: For the owner of the system: Instructions for use Warranty card For the qualified technician: Instructions for installation Electrical drawing for the appliance 1.2. Retention of documents Please pass on this installation manual to the owner of the system. The owner should retain the manuals so that they are available when required Features and benefits The boiler provides wet system central heating by passing the primary water over the immersion heaters. The immersion heaters are located on the under-side of boiler ensuring the elements are constantly immersed in the heating medium (water with appropriate inhibitor). The primary temperature in the heating circuit is determined by the outside temperature sensor and the heating curve selected in the boiler, (see sections 1.2, 1.3 and 3.5.3) The boiler temperature probe will activate and modulate 1, 2 or 3 elements in the boiler to achieve the desired primary temperature. The boiler has an automatic pump overrun for both central and water heating that prevents a build up of heat in the boiler. The boiler reservoir is insulated with 19 mm self-extinguishing Armaflex insulating material, which is sufficient to direct the whole heat only to the heating system. The boiler operates by rapidly heating a small water quantity. Energy use is maintained at 100% efficiency. No flue or fan required - Almost silent in operation - No bulk oil storage tanks required No annual safety check required 1.4. Termo concept. The OSO Termo E range of boilers uses technology widely used in Europe but relatively new in the UK, that modulates the boiler to reduce power consumption Outside temperature sensor An outside temperature sensor is supplied with the boiler to be fitted to an outside shaded wall. This sensor informs the boiler of the outside temperature Heating curves The boiler is pre-programmed with a number of heating curves to select from. The boiler calculates the heat required in the property based on the outside temperature and the set heating curve the colder it is outside, the higher the primary temperature needed in the heating system. Heating curves are set for a particular property and selection is dependent on the insulation levels of the property. Modern, well insulated buildings have a different heating curve to a less well insulated building. A poorly insulated house will require a higher primary heating temperature. Heating curves also vary according to radiator or under-floor heating. The factory set heating curve is for a building constructed to 2000 building regulations with radiator heating. Many boilers therefore will not require adjustment of heating curve. Changing the heating curves at the time of installation is a simple process for the installer. A table is shown on page 20 indicating which heating curve is required for the building type. Once the heating curve is correctly set, it should never require changing. The heating curve will aim for the property to be heated to 22 C. Not all households wish for the same internal temperature, if the residents of the property require a higher or lower temperature, the selected curve should be offset up or down by the appropriate number of degrees. Full instructions are given on page 19. A room thermostat (not supplied) must be installed to finely regulate internal temperatures. Page 1

6 1.7. Termo E Range TERMO RS E is a boiler and software package only. Expansion vessel, pump and motorized valves are not supplied TERMO Plus E is a system boiler for central heating only. Expansion vessel & pump is supplied in the boiler. TERMO PTV E is a system boiler for central heating and will provide heat for a domestic hot water cylinder. For ease of reference the boilers will be referred to in this installation manual as RS E, Plus E and PTV E. TERMO boilers are available in (240V single phase): 4.8, 6, 7.2, 10.8, and 14.4 kw. OSO Termo boilers can be connected together to provide more power, the boilers can also be supplied for use on three phase supplies. Please contact Oso for details Water heater temperature sensor The Termo PTV E boiler is supplied with a temperature probe that is inserted between the cylinder wall and insulation or in a dry pocket. This probe then relays cylinder temperature information back to the boiler. The boiler will then produce sufficient heat to raise the temperature of the domestic water to the desired level. Page 2

7 2. Termo E range 2.1. Key to TERMO boilers RS - E 1. Primary flow 2. Primary return 3. External boiler jacket 4. Boiler 5. Armaflex Insulation 6. Immersion heaters 7. Control panel 8. Cable entry point 9. Contactors and RCD switch 10. Charge and discharge val ve 11. Pocket with temperature probe 12. Safety valve (supplied loose) 13. Drain valve (not supplied) 14. Isolation valves (not supplied) 15 Manual venting valve (not supplied) Page 1

8 RS E Technical Data For RS E Power kw Boiler Capacity Litres Dimensions mm Dry Weight kg Maximum primary operating pressure MPa (bar) Connection BSP male Power supply A 330 B 750 C 230 D 100 E 57 F ,25 (2,5) ¾ 240V N ~ 50/60 Hz Page 2

9 Plus - E 1. Primary flow 2. Primary return 3. External boiler jacket 4. Boiler 5. Armaflex insulation 6. Electrical heaters 7. Control panel 8. Cable entry point 9. Contactors 10. Expansion vessel 11. Circulation pump 12. Safety valve 2.5 bar 13. Automatic air vent (AAV) 14. Charge and drain valve 15. Boiler venting valve 16. Air-indicator 17. Manifold 18. RCD switch 19. Pocket with temperature probe 20. Pressure probe Page 3

10 Plus E Technical Data For Plus E Boilers Power kw Boiler Capacity Litres Expansion vessel L/bar 6 8 / 0,8 Dimensions Mm A 330 B 930 C 230 D 100 E 65 F 320 Dry Weight kg Maximum primary operating pressure MPa (bar) Connection BSP male Power supply ,25 (2,5) ¾ 240V N ~ 50/60 Hz Page 4

11 PTV - E 1. Primary flow 2. Primary return 3. External boiler jacket 4. Boiler 5. Armaflex insulation 6. Electrical heaters 7. Control panel 8. Cable entry point 9. Contactors 10. Expansion vessel 11. Circulation pump 12. Safety valve 2.5 bar 13. Automatic air vent (AAV) 14. Charge and drain valve 15. Boiler venting valve 16. Air-indicator 17. Manifold 18. RCD switch 19. Pump for water cylinder 20. Primary flow for water cylinder 21. Pocket for temperature probes 22. Pressure probe Page 5

12 PTV- E Technical Data For PTV- E Boilers Power kw Boiler Capacity Litres Expansion vessel L/bar Dimensions Mm Dry Weight kg Maximum primary operating pressure MPa (bar) Connection BSP male Power supply /0,8 A 400 B 930 C 230 D 150 E 65 F 150 G 50 H ,25 (2,5) ¾ cylinder 1 (heating) 240V N ~ 50/60 Hz Page 6

13 2.2. Expansion Vessel Characteristics (Plus And PTV Boilers) Volume of Expansion Vessel L Maximum Expansion Vessel Pressure MPa (bar) Filling Pressure MPa (bar) Maximum Pressure In heating System MPa (bar) Max Height Difference in central Heating System m Effective capacity of Expansion Vessel L Adsorption Capacity % Maximum amount of water in primary system L Maximum power of Boiler (4) (0.8) 0.3 (3) 10 50% Values are related to working temperature range from 10C to 90C. kw 2.3. Supply Characteristics 240V N ~ 50/60 Hz POWER nominal current MCB Rated short-circuit breaking capacity I cn (EN 60898) Rated short-circuit breaking capacity I cn (IEC 947-2) Cable size* RCD switch type 4.8 kw 20 A B /0.03 A 3 x 4 mm 2 6 kw 25 A B /0.03 A 7.2 kw 30 A 10 ka 15 ka 3 x 6 mm kw 45 A B /0,03A or 40-4/0.03 A 14.4 kw 60 A B x 10 mm /0,03A or 63-4/0.03 A *min. conductor's cross-section in mm 2 is based on maximum length of 20 m. Page 7

14 3. Installation 3.1. Content included in delivery TERMO boilers are delivered pre-assembled. Check that all parts have been delivered intact. For exact list of parts see figure and table below. If parts are damaged or missing, please consult OSO Hotwater UK Ltd. Contents included within delivery Item Quantity Description 1 1 TERMO boiler 2 1 Instructions and warranty card 3 1 (2) Hanging bracket 4 1 External temperature sensor 5 1 Water cylinder temperature sensor (standard for PTV - E, optional for RS- E) 6 1 Pressure relief valve (In case of Termo Plus and Termo PTV it is already fitted on boiler, In case of Termo RS it is supplied loose) 3.2. Standards & Regulations The OSO Termo range of boilers are BEAB approved and CE marked. Health and Safety at Work Act When working with Termo boilers, ensure that protective clothing and equipment is used appropriate to parts that may considered hazardous to health and safety. Control of Substances Hazardous to Health (COSHH 1988) - Glues, paints and sealants are used in the manufacture of this product and present no known hazards when used in the manner for which they are intended. The guarantee is only valid if the following conditions are observed: The boiler must be installed by a registered engineer to comply with current building regulations, current IEE electrical wiring regulations (BS 7671), local authority regulations, water supply regulations and health and safety at work regulations. Other Relevant British/European standards should be adhered to, including; BS Specification for forced circulation hot water central heating for domestic premises, BS 7593, treatment of water in domestic hot water central heating systems Recommended pressure of central heating installation is 1.5 bar, maximum operating pressure is 2.5 bar Physical installation IMPORTANT MOVING, POSITIONING AND INSTALLING THE BOILER EXCEEDS THE RECOMMENDED WEIGHT FOR A ONE MAN LIFT. The boiler must be handled and transported carefully and stored in a safe, dry place. Plus - E, PTV - E and RS E are designed for wall installation in an upright position. Fixed wall brackets are provided on the back of the boiler. The boiler should be fixed in position on a suitable load-bearing wall prior to pipe connection. The boiler should be fitted in a dry place not subject to extremes of temperature. Cylinder cupboards and kitchens are acceptable but bath or showers rooms are not. Page 8

15 Select position for boiler The boiler should preferably be installed on the lowest point in relation to the installation. This ensures that elements are always immersed in water and there is no danger of burning out. When positioning the boiler, ensure there is adequate surrounding space to allow for pipe connection, ventilation, servicing and replacement of components. Refer to the diagram below for guidance. Access is required to the control panel connections at underside of the boiler and the power supply connection, located at left bottom side of boiler. Ensure that bottom part of boiler is accessible to change the immersion element. Ensure the boiler is in a location where it will not be affected by water drips or splashing. Ensure that ventilation to the boiler is not impeded by towels, linen etc placed very close to the boiler. Do not place towels or linen on top of the boiler. The figure below shows minimum recommended Recommended minimum clearances. clearances Fitting the boiler hanging bracket Fix the hanging bracket (see page 12 No. 3) to the wall using suitable plastic plugs and M8 or M10 screws (not supplied). Decide the position of the bottom of the boiler, giving due consideration to the recommended minimum clearance and then drill holes to accept the boiler mounting plate. Screw points should to be drilled the following distances above the bottom of the boiler casing RS E Plus E PTV E 624mm 610mm 625mm Recommendations for handling Clear the route before attempting the lift. Ensure safe lifting techniques are used keep back straight bend using legs. Keep load as close to body as possible. Do not twist reposition feet instead. If 2 persons performing lift, ensure coordinated movements during lift. Avoid upper body/top heavy bending - do not lean forward/sideways. Oso recommend wearing suitable cut resistant gloves with good grip to protect against sharp edges and ensure good grip. Always use assistance if required. 1 3 Wall mounting Important Note: If the boiler is to be fitted in a timber framed building ensure that the bracket is secured to a substantial part of the timber frame capable of taking the weight of the boiler. 2 Positioning of Appliance for Final Installation (See diagram above) Lift up boiler (3) above hanging bracket (2), gently lean it to the wall (1) and slide it down to hanging bracket (2). Page 9

16 Removing/fixing the front and top case Grasp the front case by its sides, pull it towards the front and remove it by lifting it off the unit, push top cover towards back and lift it off the unit Plumbing & Heating installation & commissioning Installation On RS - E boilers fit the supplied safety valve to the heating return point on the installation see point 12 page 4 diagram. Ensure that no valve is placed between the safety valve and the boiler. To avoid draining the entire primary system during boiler maintenance it is recommended that isolation valves are fitted to the flow and return pipes immediately below the boiler. Connect the primary flow and return pipes for the central heating system to the labeled connections on the boiler. Connect the mains water supply via a filling loop to the charge and discharge valve on the boiler incorporating a stop valve and double check valve which must be left disconnected after commissioning. Drain taps must be located in accessible positions which permit the draining of the whole system including the primary and the secondary (dhw) system. Any water loss from the system should be replaced from the filling loop connection. When draining the boiler allow air in using the boiler venting valve. Do not drain the boiler by opening the pressure relief valve. All capillary joints in all DHW pipework must be made with lead free solder. The Plus - E and PTV - E are self contained system boilers that manage heating flow to the radiators and or under floor. The PTV E also supply heat to a domestic hot water cylinder. External motorized valves are not required (excepting when a PTV E is connected to an Unvented Water Heater) and therefore systems such as S & Y plan are not applicable. As motorized valves are not used a bypass is not normally required. Product diagrams on pages 6 & 8 display the expansion vessel and pumps. Plus - E and PTV E can also be used on an open vented central heating system. Wherever possible all pipe work should be insulated to help prevent heat loss and possible freezing, particularly where pipes are run through roof spaces and ventilated under-floor spaces Ancillary components On RS - E boilers a boiler pressure gauge, circulation pump and expansion vessel must be fitted, see diagram page 6. The expansion vessel should be sized to the total system volume. The water capacity of the boiler itself is 6 liters. Diagram of recommned pump on RS-E for radiator heating Diagram of recommned pump on RS-E for underfloor heating If the capacity of the in built expansion vessel on Plus - E & PTV - E is not sufficient for the heating system (indicated by pressure increase of 0.6bar when system is heated), an additional expansion vessel can be installed external to the boiler. This should be fitted to the return pipe as close as possible to the boiler. To comply with Part L of building regulations, a room thermostat must be fitted with the boiler. This will work in conjunction with the boiler software and outside temperature sensor to finely control the temperature in the Page 10

17 dwelling and minimize energy consumption. The room thermostat should not be sited in direct sunlight or close to any heat source such as radiators. Thermostatic radiators valves may also be used, but should not be fitted in the same room as the room thermostat. After the central heating circuit has been installed open all service valves, flush pipes through and check for leaks before commissioning and introduce the correct inhibitor for a central heating circuit in accordance with BS7593. Commission the boiler slowly to allow air to escape through the automatic air vent. Remove air from pump using front screw on pumps. Pressurize the system to 1.5 bar. Where the boiler is being retro-fitted to an existing installation, it is equally important to flush the system and commission using inhibitor to BS7593. TERMO boilers are fitted with an automatic and manual air vent. The boilers are also equipped with an airindicator which detects the presence of air in the boiler. If air is detected and It exceeds the permitted level, airindicator switches off immersion heaters and circulation pump remains active, so that air is allowed to escape easily. Once the air is dispelled the immersion heaters will be active Connection to the electrical mains supply Before working with the appliance, turn off the power supply (MCB) and secure against restart. This device must be earthed. Check that the electrical supply to the building has sufficient current and voltage to supply the boiler and other appliances to be used. Miniture circuit breakers (MCB) must be fitted in the wiring prior to the boiler. For MCB ratings see table on page 12. Measure exact voltage between L and N lines prior to connecting boiler, if it 10% higher than nominal voltage on appliance, appliance itself can be damaged. Connect the boiler to the mains using a double pole linked switch with 3mm contact gap in both poles. There is an RCD switch factory fitted inside the boiler. Supply cables must be connected to the RCD switch inside the boiler as shown below. Stretching force of the network connection is 3,5 Nm. In order to connect the power supply cable, the power connection protection cover (1) must be removed by unscrewing two screws and pulling the protection cover down. The lower protection cover (4) should also be removed to facilitate access to the wiring points. The Power cable must be connected directly to the RCD (2), earth must be connected to a separate terminal (3). After connecting the power cable, the protective cover (1) must be replaced and securely fastened. Upon completion of electrical installation, carry out preliminary safety checks according to BS7671:2001 Note: Power cables from Ø6 mm to Ø20 mm must be connected from the left side of boiler and the protective cover (see 1 above) must be secured, the power cables in excess of Ø20 mm Power supply connection must be connected from the bottom side of the boiler (see 4above) using the provided entry point. Ensure that the wires are securely fixed. The appliance must be connected to mains electricity and tested according to current IEE regulations. An NICEIC inspection and completion certificate must be issued. All exposed pipework must be earthed according to current IEE regulations Boilers with power 10.8kW and 14.4 kw Boilers with power 4.8, 6, 7.2 kw RCD connection close-up Page 11

18 3.6. Room thermostat, temperature probes and pumps connection Removable connectors for room thermostat, pumps and temperature probes are located on connections plate as shown (right). Available connectors are dependent on boiler type and boiler options. Power supply to control unit:- L - Live feed to external unit N neutral to external unit PE earth to external unit 3 switched live from external unit for DHW 4 switched live from external unit for space heating Connections plate Connect room thermostat/programmer When connecting the room thermostat, follow thermostat manufacturer s instructions to connect to Termo boiler. The boiler is supplied with a fixed link between L and 4. If an external control device (room thermostat and/or programmer)is used, remove this link. The boiler s terminals 3, 4 and L N PE (power supply for control unit) are for connection to room thermostat/programmer Fit external temperature sensor The external temperature sensor (delivered with boiler) must be fitted in a permanently shaded area to prevent sudden temperature changes through exposure to direct sunlight. When fitting the sensor please observe arrow marking top position (can be seen when protective cover is removed). The sensor is an integral part of the temperature compensation principle and must be fitted as the Plus E & PTV E boilers cannot operate correctly without it. Use twin core cable diameter 0,6mm2 to 1,5 mm2, to connect external temperature sensor, The boiler is supplied with a factory mounted resistor connected to the outside temperature sensor port that simulates the outside temperature at -13ºC for testing purposes only. After installation and initial testing, the resistor must be removed and wires from the external temperature sensor must be connected to the sensor port. (Circled port on diagram below right). protective cover base External temperature sensor External temperature sensor connection point on boiler's connection plate Page 12

19 Fitting hot water cylinder temperature sensor (PTV-E only) The PTV E has a temperature sensor supplied with the boiler which must be fitted to the domestic hot water cylinder as this ensures a correct reading of the secondary (DHW) temperature. Use twin core cable of diameter 0.6mm2 to 0.75 mm2. The cable runs from the boiler to the hot water cylinder and the probe should be inserted approximately 30% of the way up the cylinder and at least in the top half of the area covered by a heating coil. The probe must be touching the cylinder wall and held in place using the cylinder insulation. Alternatively a thermostat pocket can be used if available and in the correct position. Water Cylinder temperature sensor Water cylinder temperature sensor connection point on boiler's connection plate Fitting pump connections and expansion vessel (RS E only) Termo RS E requires expansion vessel and pump(s) to be connected to the heating circuit according to diagram on page 6. Circulation pumps for central heating and hot water should be connected to connections plate according to diagrams in Appendix 1. Termo Plus and PTV boilers are supplied with pumps and expansion vessel factory fitted and pumps wired to the connections plate. Page 13

20 4. Setting up Boilers RS - E & Plus - E Space heating with outdoor temperature compensation PTV - E Space heating with Outdoor temperature compensation and domestic hot water 4.1. Control Panel (including fault finding indicators) 1. Display Default display is of current primary temperature inside the boiler. Temperature range is -19 o C (below -19 o C the display shows - -) up to + 99 o C (above +99 o C display blinks). Following warning signals can be displayed: P1 anti freeze protection for secondary (DHW) is active P2 anti freeze protection for central heating is active o1 or c1 thermal sensor for primary temperature isn't connected or is short-circuited o2 or c2 thermal sensor for external temperature isn't connected or is short-circuited o3 or c3 thermal sensor for secondary (dhw) temperature isn't connected or is short-circuited 2. Led diodes of heater stages in use LED diodes light to show how many heating elements are active. 3. Led diode OK/air in boiler If there is no air in the boiler, the diode lights green. If air appears in the boiler, the diode lights red and the boiler shuts down. Upon de-aeration, the diode automatically changes the color to green and operation of the boiler continues. 4. Led diode insufficient supply voltage Lights red if the net voltage is below 170 V and the boiler shuts down. 5. Led diode for central heating Indicates the operation of heating circulation pump, provided that the room thermostat is on. 6. Push button to adjust central heating programming. 7. Central heating switch (0 standby, 1 on) Page 14

21 8. Push-button to adjust secondary (dhw) programming. 9. Secondary (dhw) switch (0 standby, 1 on) 10. Led diode for secondary (dhw), Indicates domestic hot water pump is operating. 11. Water pressure gauge for heating system. 12. Safety thermostat IMPORTANT: If an error is displayed on the LED display (1) the boiler will stop. If the error is corrected the boiler will automatically continue operation. If error o3 or c3 occurs, (see 1 above) the boiler will cut out. In this instance it is possible to operate the boiler in central heating mode until the domestic hot water is operational. This can be done by switching off the domestic hot water with switch number Choose type of heating (radiator or under floor heating) Factory default is for radiators. To change to under floor heating, follow instructions below. 1. Disconnect from mains supply 2. Remove front cover of boiler. 3. Remove perspex control panel cover (prize off with screwdriver down channels at either side) 4. Remove control panel, (Push up from bottom and pull out. Pull out whole of panel, there should be no need to disconnect any wires connected to control panel) 5. Remove black plastic shroud at rear of control panel by undoing 2 cross headed screws. 6. Control switches for heating curves are in the position circled in the photograph above. 7. Default setting for radiators is as shown for under floor heating change to 8. Replace black plastic cover. Re-fit control panel. Re-fit panel protector. Re-fit the boiler front cover. ON OFF Pin 1 ON Pin 1 OFF (Factory settings) Function Set heating type to under floor, curves from 0.1 to 0.9 are active, minimum boiler temperature is set to 15ºC, maximum boiler temperature is set to 45ºC Set heating type to radiator, curves from 1 to 3 are active, minimum boiler temperature is set to 25ºC, maximum boiler temperature is set to 90ºC Pin 2 ON Pin 2 OFF (Factory settings) Disable outdoor temperature compensation, user must manually select temperature in boiler Enable outdoor temperature compensation, default curve for radiator heating is 1.5 and 0.6 for under floor heating Pin 3 Pin 4 Used during manufacturing process Used during manufacturing process Page 15

22 Hybrid Systems combining radiator and UFH If the boiler is to be used to heat a hybrid system i.e. wet radiator system and under floor heating no alterations should be made to the factory setting. In this situation a blending valve should be fitted in the under floor heating manifold to reduce the flow temperature to maximum 50C Activating system and programming central heating Off mode - The boiler is connected to the electrical supply but the RCD switch (page 12) is off Standby mode the RCD switch is on but the central heating on/off and dhw switches on control panel are off On mode RCD switch, dhw and central heating switch are all on Switch to on mode - Test the RCD switch by pressing T button on it. Reset the RCD switch Operations with Honeywell or Danfoss control units: With central heating programmer (Honeywell ST6400, Danfoss TP-9 7-day programmer or similar) it is possible to program separate periods of central heating from periods for domestic water heating. Switches 7 and 9 on electronic control panel have a different function when 7-day control unit for central heating and sanitary water preparing is installed. In this case position 0 is AUTO (operations as controlled by control unit Honeywell/Danfoss) and position 1 is MANUAL (operations are controlled by boiler s control panel). When sanitary water and apartment temperature rises to desired level, boiler automatically goes to standby position (everything is switched of except standby led diode). Factory defined curves Sample of modified curve Heating curves explained. Heating curves take information from the outside temperature sensor and decides on the required primary temperature in the heating system to maintain the desired internal temperature based on the insulation properties of the building. The colder it is outside, the higher the temperature needed in the heating system. Poorly insulated (older) properties require more heat, hence a higher heating curve is selected. Heating curves save energy. A correctly set curve will optimize savings. A curve set too low will result in a house that feels cooler than desired. A curve set too high will not optimize savings. Page 16

23 Termo E boilers are supplied with a full range of curves to choose from. The choice of a heating curve is dependent on the insulation levels in the building. Heating curves can be altered at any time by the householder, but once correctly set, should never require adjustment. The best guide to insulation levels is the age of the building, as insulation levels have steadily improved over time. The factory set heating curve is for buildings built to 2000 building regulations and UK heating installation common practice. The table below shows the suggested heating curves for properties of differing ages. If extra insulation has been retro-fitted to a building, a lower heating curve will be appropriate To set correct curve Turn central heating on (key 7). Press key 6 UP and hold for five seconds to enter curve selection menu. The set curve blinks in the display. Press key 6 up or down to alter curve selection in steps of 0,1, see the diagram on the front plate. If there is no pressure on the key for more than 5 seconds the curve displayed is saved. Construction date Radiator curve under floor curve Pre Factory default 1.5(mod) 0.6(mod) Factory default curves have been modified specifically for UK heating design standard practice. If curve is altered and default curve is then subsequently required, a factory reset is required. See instructions page Setting internal temperature Heating curves are factory set to achieve a 22 C room temperature. Should the temperature required differ from this, the primary temperature should be raised or lowered (offset) 3 C for every 1 C higher or lower required as room temperature. e.g. if 20 C room temperature is required, the primary temperature should be lowered by 6 C. Offsetting the heating curve will change the temperature of the water in the boiler without changing the shape of the curve. See diagram above. To offset the curve. Press key (6) down and hold for 5 seconds to enter offset curve selection menu The set offset in C blinks in the display. Press key 6 up or down to change offset in steps of 1 C. If there is no pressure on the key for more than 5s shown value of offset in C is saved. Factory setting is 0 C. Offset range is from 9 to +20 C. Please note that Thermal (heating) processes are slow, and the impact of alterations will not be felt immediately. Oso recommend that adjustments are given at least 24 hours to take effect. It is also recommended to make a log of all adjustments made and their result. This will assist in making accurate alterations in the future. If settings as described above are not adequate for achieving the wanted room temperature, supplemental adjustments of the heating curves and offset can be made by the user. See table below Conditions experienced Room temperature is too low if the external temperature is above + 5 o C Room temperature is too low if the external temperature is between + 5 o C and - 5 o C Room temperature is too low if the external temperature is under - 5 o C Room temperature is too high if the external temperature is above + 5 o C Room temperature is too high if the external temperature is between + 5 o C - 5 o C Room temperature is too high if the external temperature is under- 5 o C Curve selection Lower curve by 0.1 Leave the curve Higher curve by 0.1 Higher curve by 0.1 Leave the curve Lower curve by 0.1 Offset (radiator heating) Add with offset + 6 o C Add with offset + 3 o C Leave offset 0 o C Lower with offset - 6 o C Lower with offset - 3 o C Leave offset 0 o C Offset (UFH heating) Add with offset + 4 o C Add with offset + 2 o C Leave offset 0 o C Lower with offset - 4 o C Lower with offset - 2 o C Leave offset 0 o C Programmable room thermostats & setting variable internal temperatures Central heating is controlled by the heating curve programmed into the Termo E boiler and fine tuned by a room thermostat. With modern central heating controls such as a programmable room thermostat it is possible to set different room temperatures at different times of the day. e.g. to have a lower temperature set during the night. If this system is used the heating curve selection is unchanged and the offset of the heating curve should be set to the highest room temperature required during the day. (See paragraph above). The programmable room thermostat is then set according to the manufacturers instructions to set lower temperatures when required. Page 17

24 When setting variable temperatures please be aware that the heating system will take some time to heat up from cold and similarly will remain hot for some time after the temperatures are reduced or the system is switched off. To optimize comfort levels and minimize energy consumption it is suggested to activate the boiler 30 minutes before the set temperature in heating system is required and to reduce temperature or switch off 30 minutes before the lower temperature is desired Domestic hot water priority Domestic water heating has priority over central heating. When the domestic hot water temperature sensor calls for heat, the central heating circulation pump is switched off and domestic hot water heating circulation pump is switched on. The setting of secondary (DHW) temperature regulates the desired primary temperature in the boiler. The primary water is set at 15 C higher than the desired secondary (DHW) temperature. (Independent of central heating curve). The boiler heats the cylinder until the desired secondary (DHW) temperature is reached, the elements will then power down and the pump overrun operates - see page 24. If the central heating is on, when the desired secondary (DHW) temperature is reached, the desired primary temperature reverts to the value from the heating curve. If the central heating is off, when desired secondary (DHW) temperature is reached, the desired primary temperature reverts to the stand-by value of primary water temperature in the boiler. If the cylinder probe repeatedly calls for domestic hot water heating, the desired water temperature in the boiler is automatically set to 15 C higher than the desired secondary (DHW) temperature. There is a 5 C difference between switch on and switch off for secondary (DHW) heating. If the desired temperature of hot water cylinder is 60 C, the domestic hot water is activated only when the cylinder store temperature cools to 55 C. Domestic hot water heating is switched on until the hot water temperature reaches 60 C. During periods of simultaneous demand for space heating and domestic water heating, the boiler will alternate between the two every 30 minutes Protection from freezing Domestic hot water If the boiler is on, protection from freezing of the domestic hot water cylinder switches on automatically when the cylinder temperature reads a value below 5 C, signaling switching on by blinking display, as well as the LED diode of the heater and water heating, regulating the cylinder temperature to 5 C Central heating To protect the entire central heating system from freezing (if a building is to be left empty for an extended period of time during cold weather), set the boiler to standby mode. The room thermostat or central heating programmer must be set to freezing protection mode (usually 5 to 7 C, depending from room thermostat manufacturer), this will allow pump to circulate heated medium through central heating system. Page 18

25 5. Recommended annual checks (all boilers) The safety valve should be checked annually, preferably before the heating season to ensure correct operation and avoid accumulation of lime scale. It is not recommended to annually drain the system to protect the system from freezing as refilling with fresh water will increase the risk of limescale attack We recommend inspection of the boiler once a year by an authorized service engineer. This service is not included in the guarantee. During the inspection all electric and water connections should be tightened, the system should be vented and if necessary filled up, valves and general functionality of the device and safety valves should be checked. When cleaning the product do not use an aggressive liquid as e.g. gasoline, kerosene or solvent. For the external shell and decorative cover, liquid for cleaning plastics or dish washing media may be used. Control panel should be cleaned with dry or moist cloth (not wet). Page 19

26 6. Central heating controls advanced menu. Please note that the following information provides full details on the options available for Termo boilers. In most installations the factory settings do not require alteration. Instructions necessary for standard installations are slanted. Instructions necessary only for advanced programming are underscored. Please note that keys 6 and 8 have a rocker action and operate as directed below by up or down pressure 32 Display of actual primary temperature inside boiler. Default display is of actual primary temperature inside boiler. Display of desired primary temperature inside boiler <5 sec 41 >5 sec Press key (6) up and release to see desired primary temperature inside boiler. (Calculated from selected heating curve) The Display shows the desired temperature of primary water in the boiler. The value is shown for 5 s, after which display reverts to show actual temperature of primary water in the boiler. >5 sec 0.6 >10 sec >15 sec 3 90 >5 sec >5 sec >5 sec Heating curve selection (ensure correct choice of radiator or underfloor curves see part page 12) Press key (6) up and hold for 5 seconds to enter curve selection menu. The display blinks showing current curve setting Values range between 1 and 3 or 0,2 and 0,8. Curves between 1 and 3 are for radiators central heating and curves 0,2 to 0,8 are for under floor heating. Press the key up or down, to alter curve selection in steps of 0,1, according to the diagram on the front plate. If there is no pressure on the key for more than 5 seconds the curve displayed is saved. Limiting maximum power of boiler (manually deactivating 1 or more immersion elements). Press key (6) up and hold for 10 seconds to limit power level. By pressing the key up and down it is possible to select 1 2 or 3 as number of available power levels (immersion heaters). If there is no pressure on key (6) for more then 5 sec. selected power level mode is saved. Boilers from 6 to 16 kw have only two power levels. Limiting maximum primary temperature inside boiler (max possible is 90 C for radiator heating and 50 C for under-floor heating) Press key (6) up and hold for 15 seconds to limit maximum primary temperature inside boiler. Factory defined maximum primary temperature starts to blink, by pressing key (6) up or down user can set new maximum primary temperature. If there is no pressure on key (6) for more then 5 sec. selected maximum primary temperature is saved. This temperature represent temperature maximum that can be achieved regardless of selected curve. >20 sec Manual selection of desired primary temperature inside boiler >5 sec Press key (6) up and hold for 20 seconds to set primary temperature in boiler, regardless of previously selected curve. Desired primary temperature starts to blink. By pressing key (6) up or down user can select fixed primary temperature in boiler. If there is no pressure on key (6) for more then 5 sec. fixed primary temperature is saved. When boiler is in fixed primary temperature mode, LED display blinks while displaying current primary temperature in boiler. For next change of fixed temperature, user can just press key (6) up or down. When boiler is in fixed primary temperature mode, all heating curves are disregarded. To return to heating curve mode, boiler must be switch OFF and back ON using ON/OFF switch. Page 20

27 Continuation Display of external temperature <5 sec -1 >5 sec Press key (6) down and release to see external temperature. The Display shows the external temperature. The value is shown for 5 s, after which display reverts to show actual temperature of water in the boiler. >5 sec 0 >5 sec Offset of currently selected heating curve (see part page 13) Press key (6) down and hold for 5 seconds to enter offset curve selection menu LED display will show current offset in C. Offset doesn t affect maximal or minimal temperature, they are set in absolute values By pressing the key (6) up or down it is possible to change offset in steps of 1 C. Factory setting is 0 C. Offset range is from 9 to +20 C. If there is no pressure on the key for more than 5s shown value of offset in C is saved. Setting the minimum primary temperature inside boiler >10 sec 20 >5 sec Press key (6) down and hold for 10 seconds to select minimum primary temperature inside boiler. Minimum primary temperature starts to blink. Factory setting is 45 C for radiator heating. Factory setting is 30 C for under floor heating. By pressing the key up or down user can select desired primary temperature in range from 10 to 50 C. Temperature changes in 1 C steps. If there is no pressure on the key for more than 5s the value from the display is saved as the desired minimum primary temperature. >15 sec 1.4 Displaying software version and factory reset Press key (6) down and hold for 15 seconds, LED will show software version and factory reset of central heating parameters will occur. Page 21

28 6.1. Domestic hot water advanced menu (control panel type 2) 32 Display of desired secondary (DHW) temperature <5 sec 50 >5 sec Press the key (8) up and release, LED display will show desired secondary (DHW) temperature. The value is shown for 5 s, after which display reverts to actual temperature of primary water in the boiler. >5 sec 50 >5 sec Setting desired secondary (DHW) temperature Press key (8) up and hold for more than 5 seconds to set secondary (DHW) temperature. The desired secondary (DHW) temperature blinks. By pressing the key (8) up or down the value of desired secondary (DHW) temperature in the storage cylinder changes in 1 C steps. If there is no pressure on the key for more than 5s the value from the display is saved as the desired secondary (DHW) temperature. Possible adjustment from 10 C up to 65 C. Factory default is 50 C. >10 sec 1.4 Displaying software version and factory reset Press key (8) up and hold for longer than 15 sec, LED will show software version and factory reset of central heating parameters will occur. Page 22

29 Continuation Display of current secondary (DHW) temperature <5 sec 36 >5 sec Press key (8) down once and release to display current secondary (DHW) temperature. The value is shown for 5 s, after which display reverts to actual primary temperature in the boiler. >5 sec 1.0 >5 sec Setting pump overrun for secondary (DHW) water Press key (8) down and hold for 5 seconds to set pump overrun of secondary (DHW) water The time for secondary (DHW) pump overrun blinks. Press key (8) up and down to change time from 0.1 min up to 1.9 min. with the step of 1 digit. If there is no pressure on the key for more than 5s, the value from a display is saved as time for secondary (DHW) pump overrun. Factory default overrun is 1 min. Setting stand by primary temperature inside boiler Press the key (8) down and hold for 10 seconds to set stand by primary temperature inside boiler. >10 sec 20 >5 sec LED display will show current stand by primary temperature inside boiler. Press key (8) up or down to change stand by temperature in range from 10 C to 50 C, by 1 C. If there is no pressure on the key for more than 5s, the value from a display is saved as stand by primary temperature inside boiler. >15 sec 1.4 Displaying software version and factory reset Press the key (8) down and hold for 15 sec, LED will show software version and factory reset of central heating parameters will occur. Page 23

30 7. Fault finding guide The boiler is not operating or radiators are cold Please check the following before going through fault finding flowchart. Check the installation is correct. All isolating valves are open. The system is full of water (pressurised) and purged of air. Programmer and controls outside of boiler are on. Check the electrical supply is connected correctly and present Is the boiler switched ON? Electrical part of boiler (heater, switch, relay) is faulty Switch boiler ON Switch ON MCB Is the green LED light ON? Are the MCB (on master switch board) and RCD (in boiler and master switch board) switched ON? Switch ON RCD Reset safety thermostat and try again to switch RCD ON RCD can't be switched ON Does DISPLAY show temperature inside boiler? Faulty control panel Is the temperature of water same as desired? Wait for boiler to heat up One or more heaters are faulty Is the room thermostat switched ON? Switch ON room thermostat Check isolation valves Page 24

31 When switched on, switches on control panel show the voltage, however the boiler does not heat Is the RED lamp ''air in the boiler'' illuminated? Check the water pressure and purged of air Please check the following before going through fault finding flowchart. Check the installation is correct. All isolating valves are open. The system is full of water (pressurised) and purged of air. Programmer and controls outside of boiler are on. Check the electrical supply is connected correctly and present Is the limiting thermostat activated? Safety thermostat can be activated if air is present in installation or operation thermostat is faulty or relay is blocked Is the room thermostat too low? Adjust correct temperature Is the operating thermostat defective? Replace the operating thermostat with new Is the voltage present on immersion heaters Replace the immersion heaters Page 25

32 Boiler ''roars'' while heating Central heating system was not vented properly Lower the speed on central heating pump (see guide below) Please check the following before going through fault finding chart: Check the installation is correct. All isolating valves are open. The system is full of water (pressurised) and purged of air. Programmer and controls outside of boiler are on. Check the electrical supply is connected correctly and present Check the water pressure and vent the central heating system Defective immersion heaters - change the heaters Changing the speed of pump for central heating For Termo Blok and Termo Blok PTV, open the cover of boiler as described in chapter 4.4. and locate central heating pump, use chapter 2.4. for assistance. Move speed slider (1) to desired mark. For Termo Extra boilers external pump is fitted, consult pump manuals for guidance. Selecting pump speed Page 26

33 Central heating is working but domestic hot water (DHW) is not working Are the parameters for DHW on control panel or/and external programmer correct? Change parameters Please check the following before going through Fault finding chart. Check the installation is correct. All isolating valves are open. The system is full of water (pressurised) and purged of air. Programmer and controls outside of boiler are on. Check the electrical supply is connected correctly and present Is the relay RHW in ON possition? Is the voltage present on terminals a1(l) and a2(n) of relay RHW? Check external programmer Change the relay RHW Is the votage present on DHW pump therminals? Find and restore break of connection Change the DHW pump Page 27

34 Domestic hot water is working but central heating is not working Are the parameters for central heating on control panel or/and external programmer correct? Change parameters Please check the following before going through Fault finding chart. Check the installation is correct. All isolating valves are open. The system is full of water (pressurised) and purged of air. Programmer and controls outside of boiler are on. Check the electrical supply is connected correctly and present Is the relay RCH in ON possition? Is the voltage present on terminals a1(l) and a2(n) of relay RCH? Check external programmer / room thermostat Change the relay RCH Is the votage present on CH pump therminals? Find and restore break of connection Change the CH pump Page 28

35 RCCB switch cannot be switched ON Check the status of safety thermostat, try to reset it Switch on RCCB switch Please check the following before going through Fault finding chart. Check the installation is correct. All isolating valves are open. The system is full of water (pressurised) and purged of air. Programmer and controls outside of boiler are on. Check the electrical supply is connected correctly and present Check existance of resistance between terminals N,3,5,7 or RCCB switch and PE Find component which has contact between earth (PE) and change it. Change the RCCB switch Page 29

36 8. After Sales service information If after using the fault-finding guide above the problem cannot be rectified by the installation engineer on site, a qualified Oso Service Engineer is available during normal office hours to attend a breakdown. A charge will be made if: There is not a fault with the Termo boiler or the breakdown was caused by incorrect installation of the product that does not conform to the installation manual. Components fitted on the system that were not supplied by Oso are preventing the satisfactory operation of the Termo boiler. The terms and conditions of the guarantee have not been satisfied or the warranty period of the Termo boiler has expired. Many boiler manufacturers find that a very large proportion of service calls are not caused by a product fault. Please read the fault finding guide and the other instructions in this manual carefully. Oso will not accept unauthorized invoices from any third party for repair or service work to Termo boilers. 9. Cascade power limiter Where there are other high load electrical appliances e.g. electric ovens, electric showers etc fitted in the property with the boiler there is a possibility of overload on the electrical system. The Oso cascade power limiter is a unique device that continually monitors the electricity consumption of the property and if required will power down the boiler temporarily to prevent overload. 10. OSO Hotwater UK Ltd Oso Hotwater UK Ltd E15, Marquis Court Team Valley Tarding Estate, Gateshead Tyne & Wear NE11 0RU Tel: Fax: technical.uk@oso-hotwater.com sales.uk@oso-hotwater.com spareparts.uk@oso-hotwater.com 11. Appendices Appendices with further technical information are displayed on the following pages, These appendices should be used in conjunction with the information supplied elsewhere in the manual and show additional schematic and electrical diagrams to assist in the installation of Termo boilers into different central heating systems. Advice is given for a variety of standard systems commonly used in the UK, however the list is not exhaustive and OSO Hotwater UK Ltd cannot guarantee that the advice will be correct for any particular system. All diagrams are shown for informational purposes only. Diagrams are not comprehensive and do not show every system detail. Page 30

37 11.1. Appendix 1 - Termo RS with space heating and water heating Schematic diagram Termo RS - E Wiring diagram Termo RS - E Page 31

38 S-Plan wiring layout Termo RS -E Page 32

39 11.2. Appendix 2 - Termo RS Space heating only Schematic diagram Termo RS - E Wiring diagram Termo RS-E Page 33

40 S-Plan wiring layout Termo RS-E Page 34

41 11.3. Appendix 3 - Termo PLUS E Schematic diagram Termo plus-e REMARK: this scheme is for informational purposes only, not all details necessary for installation are shown BASIC USAGE SAMPLE FOR CENTRAL HEATING BASIC USAGE SAMPLE FOR CENTRAL HEATING With Termo Plus E electric boiler up to 14.4kw N-50/60Hz and up to 36 With Termo Plus E electric boiler up to 14.4kw N-50/60Hz and up to 36 kw 415V 3 N-50/60Hz kw 415V 3 N-50/60Hz Wiring diagram Termo plus-e Page 35

42 S-Plan wiring layout Appendix 4 Termo PTV E Schematic diagram Termo PTV-E Wiring diagram Termo PTV-E Page 36

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