eco hometec Variable Controlled Output (VCO) Solar Compatible jjjjj Condensing Boilers EC 25 COMPACT INSTALLATION & USER INSTRUCTIONS PLEASE LEAVE WITH THE END USER
eco hometec Unit 11E Carcroft Enterprise Park Carcroft Doncaster DN6 8DD Tel. 01302 722266 Fax. 01302 728634 e.mail. sales@ecohometec.co.uk http://www.eco-hometec.co.uk D:\Septemeber2000Manuals\EC25CompactManual8070900.doc\30 June 2002 eco hometec has a policy of continuous improvement and reserves the right to change any specification without notice. Your statutory rights are not affected.
Contents 1. Safety Considerations .........................6 2. Symbols...............................................6 2.1 Gas Safety....................................6 3. Electrical Supply ..................................6 4. Terms of Warranty...............................7 5. Commissioning Certificate...................7 5.1 6. Existing Installations ............................7 6.1 6.2 7. Variable Controlled Output ...........8 Emissions. ....................................
25.1 25.2 25.3 25.4 Combi Type ’S’ Tap boiler ..........38 General operation ......................38 Pump operation..........................38 Hot Water Cylinder .....................39 26. Safety devices ...................................39 26.1 26.2 26.3 26.4 26.5 26.6 26.7 Electronic ignition .......................39 Flow protection...........................39 Max. temperature protection ......40 Static pressure ...........................40 Air supply monitoring..................
HEALTH & SAFETY INFORMATION FOR THE INSTALLER AND SERVICE ENGINEER Under the current issue of the Consumer Protection Act and the Health and Safety at Work Act it is a requirement to provide information on substances hazardous to health (COSSH Regulations). eco hometec takes every reasonable care to ensure that these products are designed and constructed to meet these general safety requirements, when properly used and installed.
1. Safety Considerations The installation of this appliance must be carried out by a competent person in accordance with the relevant Gas Safety Regulations (as amended), Building Regulations, Model Water Bylaws and the Building Standards (Scotland) Regulations. eco hometec shall not be responsible for any damage or loss resulting from failure to carefully observe the instructions given.
The manufacturers instructions must NOT be taken in any way as over-riding statutory obligations. 4.
are not used, the eco hometec guarantee will become null and void. 6.2 Expansion Vessels The EC25 Compact is designed for connection to a fully pumped sealed heating circuit only. A suitable sized expansion vessel is required to accommodate volume change (expansion of water) when heated up to maximum operational temperature. Select an expansion vessel that matches the volume of the CH system and the static pressure.
set and adapted to the capacity of the CH system. 8.2 EC 25HS Compact The ‘HS’ range are higher specification. With its 4 x 15mm connections it offers a low temperature output, typically 55OC, for under-floor heating or a fixed/variable temperature output for connection to radiators. Despite the low boiler flow temperatures feature ALL low temperature under floor installations require an obligatory mixing valve or high temperature cut out thermostat installing as part of the system controls.
9. Technical Information. Table 1 Dimensions & Connections Product Identification Number CE ~ 0063 AT3070 Dimensions (H x W x D) 600mm x 360mm x 300mm Heating Circuit Connections 15mm Gas Connection 15mm Condense Drain Connection 15mm Air Supply/Flue Connections 60mm-60mm (eccentric) 125/80mm (concentric) Table 2 Heating Specifications Models H, HS and S EC25 Nominal Input To Heating kW Maximum Rated Input (S Type combi only) 7.2 – 24.5 kW 28 0 kW 7.1 – 24.
Table 4 Hot Water Specifications Model EC25S Maximum Rated Input kW 28 Modulating Output kW 8-28 Hot Water Flow rates at ∆τ 30K (S type) L/min 13 Maximum Tap Water Pressure bar 8 Table 5 Connection Values Min/Max Gas Pressure mbar 20/25 Maximum Input Rate Natural Gas (H & HS Types) m/h3 2.58 3 2.95 Maximum Input Rate Natural Gas (S Types) m/h Electrical Supply VAC 230 Power Consumption Average W 85 Thermostat Voltage V 24 Table 6 Emission Values CO2 natural gas: 8.
Figure 1 Component Locations Page 12 ECO HOMETEC (UK) LTD.
Table 7 Pos.
Follow the unpacking instructions on the packaging. Take the handbook out of the plastic packaging around the boiler. 10.3 Check the type plate Check that the details stated on the type plate agree with the present installation and the intended use. Mounting bracket. 11. Accessories The following items are also available from eco hometec at extra cost. Colour coded 1/4 Turn Isolating Valves. Never use any type of gas other than that which is specified on the type plate.
12. Operation A key component of the boiler is the premixing gas burner, which is capable of producing a Variable Controlled Output (32% to 100% ratio). For Combi EC25S types (32% to 115% ratio). A unique feature of the burner is its shape, which has been specially designed to suit the geometry of the combustion chamber. It is composed of a perforated sheet of stainless steel. On the surface of this burner, accurate quantities of premixed gas and air are burnt almost without a visible flame.
requirements thus increasing the number of possible suitable locations. necessary. Detailed guidance on subject can be found in BS. 6798. The EC25 Compact models may be installed on the inner face of an external wall and some internal walls providing they are flat, vertical, of a non-combustible material and are capable of supporting the weight of the boiler and any other ancillary equipment. Where installation will be in an unusual location, special procedures may be 13.
Figure 3 Minimum Clearances 14.4 Checks Before Siting Before commencing to install this appliance ensure the design specification complies with all of the requirements contained in these installation and servicing instructions and any statutory documents which may apply. Figure 4 Removing Casing Pull the casing upwards, lifting up and off the locating lugs. Place the casing to one side taking care not to scratch the casing or control panel cover. (see fig. 5.
Figure 6 Overall Dimensions 14.7 Mounting the support bracket For mounting the support bracket on a brick wall of sufficient thickness, use the screws and plugs supplied with the bracket. When you have decided where the bracket is to be mounted, proceed as follows (see Fig.7) Page 18 ECO HOMETEC (UK) LTD. Mark the position of the hole (10) in the bracket. Please remember when using power tools to take all necessary safety precautions and always wear safety goggles.
Use an 8 mm dia. concrete drill to bore a hole in the wall to a sufficient depth. Align the hole (10) in the support bracket with the hole in the wall and pass one of the plastic plugs (9) delivered with the bracket through the support bracket into the hole. Align the support bracket with aid of a spirit level. Drill holes with an 8 mm dia. concrete drill through the two lower holes (11) in the support bracket to a sufficient depth in the wall.
Figure 8 Concentric Flue Hold the appliance upright against the wall at approximately. 5 cm above the place where it will be mounted. Press the appliance into the guides and carefully allow it slide downward, so that the hook on the support bracket falls in the opening at the back of the appliance and the pins below the appliance drop into the corresponding openings in the support bracket. The connections on the appliance will then mate up with the connection points on the support bracket. 14.
Figure 9 Flue Design Boiler output in relation to available flue Pa lower outputs = more Pa and longer flue lengths 500 450 400 Available flue ~ Pa 350 300 250 200 150 100 50 0 25 26 27 28 29 30 31 32 33 Boiler output ~kW For the purposes of flue design when using the eco hometec PPS 125mm/80mm concentric flue system then refer to the table below for component resistances. Table 10 Flue Resistance COMPONENT RESISTANCE P.
Figure 10 Thermal Lift Thermal lift when flue gas temp 80C and outside temp 10C 180 160 140 120 Uninsulated Flue 100 Insulated Flue 80 60 40 20 48 44 40 36 32 28 24 20 16 12 8 4 0 0 Flue lengths ~ m etres Thermal lift is generated naturally in the vertical part of a flue system, reducing the overall resistance of the system. The available lift may be calculated from the Thermal lift graph and deducted from the total calculated flue resistance. 15.
For installations requiring greater flue lengths - please contact the eco hometec technical department for advise. Measure and cut the concentric flue pipe to pass through the previously made hole and into the concentric 90o bend. The flue should terminate with a suitable terminal. Apply a chamfered edge to the cut ends, apply silicone lubricant and insert through the wall and into the flue/air socket.
Note: two 450 may be used to form a swan neck returning the flue pipe back to the wall for clipping. Route the pipe to the desired location and terminate with a suitable bend to direct the flue gases away from the wall or any obstruction. When you are satisfied that the location complies with the requirements of figure 23 replace the stainless steel 80mm flue grill.. Alternatively a 900 terminal fitting may be purchased from eco hometec and the flue routed vertically. Figure 12 Vertical Wall Terminal 15.
Figure 13 Vertical Flues Figure 14 Vertical Terminals EC 25 Compact Installation/User Manual page 25
Concentric vertical flue fittings are available from eco hometec. Figure 16 80mm Flue Tubes Concentric flue components have push together spigot and socket joints. The inner PPS flue gas tube has silicone seal rings located in the socket component. The outer air tube has EPDM rubber seal rings located in the socket component. To aid assembly and assurance that the joints have been fully pushed home, the seal rings and make ends of tubes and fittings should be lightly lubricated with silicone grease.
15.7 Terminal Positions Figure 17 Fan Flued Terminal Positions. Table 11. Flue Terminal Positions. Terminal Positions Min.Distance A: Directly below an opening window or other opening, e.g. air brick 300mm Directly above an opening window or other opening, e.g. air brick 300mm B: Below gutters, soil pipes or drain pipes.
16. Gas Supply The boiler is set for use with either natural gas or LPG. 16.1 Gas Supply Pipe-work from the meter to the boiler MUST be of an adequate size. DO NOT use pipes of smaller size than the boiler inlet gas connection. The gas supply to the boiler must be capable of maintaining a minimum pressure of 20 mbar measured at the inlet to the boiler, with all other gas appliances working. The installer should install a pressure test point adjacent to the gas inlet connection. 16.
Position ventilation grilles to avoid the risk of accidental obstruction by blocking or flooding. BS 5540.2 Table 12 Ventilation Vent Position Into room or internal space 2 Direct to outside air High level 9 cm per kW of input 4.5 cm2 per kW of input Low level 9 cm2 per kW of input 4.
18. Hydraulic Requirements The boilers are intended to be used in conjunction with FULLY PUMPED, SEALED systems subject to the requirements below. They are NOT SUITABLE for use on gravity circulation systems. The boiler must NOT be used for direct hot water supply.
The central heating system should be in accordance with the recommendations given in BS. 6798 and BS. 5449. 18.2 Condensate Drain The condense discharge pipe should be continued in ¾ inch plastic waste pipe into the household drainage system or out through the wall to an existing gully or soak away. To minimise the risk of freezing all condensate waste pipe-work fitted externally should be 32mm. (The existing drainage system should be corrosion resistant).
20. Heating Control Options Figure 19 Connection Terminal Block The low voltage terminal strip can be used to connect the following. Hot water cylinder sensor. External temperature sensor. Room thermostat. All of the above are available from eco hometec WARNING Low Voltage Connections do not connect 240 volts to the low voltage terminal strip. Figure 18 Controls Terminal 20.1 Connecting Room Thermostat Strip approximately 5 mm of the insulation from the connecting wires for the room thermostat .
This temperature sensor must be an NTC with a resistance of 12 kΩ at 25 °C (see also the list of accessories). resistance to earth using a suitable multi meter. 21.2 Strip approximately 5 mm of the insulation from the connecting wires for the sensor. Insert the stripped ends of the connecting wires in the connections (3) and (4) of the terminal block (Fig. 18). Ensure that the wires do not cause a short circuit. Tighten the screws firmly in the terminal block. 20.
Flush the system with clean water until the discharge runs clear. For further information about filling the system contact the eco hometec Technical Support Department. Make good final connections to boiler. 21.6 Filling and Venting the System 22. Combustion Ratio Using a suitably approved filling loop connected to the incoming mains cold water supply, fill the system. Due to the precise combustion processes it is imperative that flue gas analysis equipment be used when setting up the burner.
Make sure there is sufficient heat removal by turning on the central heating system. Activate the chimney sweeper function (See Section 24. The burner will now operate at maximum capacity. Read the CO2 value displayed on the exhaust gas analysis equipment. If this value does not agree with the correct value as specified in the following table, you must carefully adjust the screw (1) (Fig. 5.1). Turn it counter clockwise in order to increase the CO2 value and clockwise in order to reduce it.
23.2 Flue System Check In order to examine the flue pipe sealing, with the boiler running, it is essential that an O2 or CO2 reading is taken from the sample point 3 (fig 21) positioned on the left of the concentric adaptor. The flue seal is satisfactory when the CO2 value is no more than 0.2% and the O2 value no more than 20.6%.
switches back to low speed. When the heating demand is removed, the pump continues to run for the pre-set overrun time, at the end of which it is switched off. 24.5 8.1.5 Frost protection If the temperature detected by the supply sensor falls below 8 °C, the pump will be switched on and will circulate water through the central heating circuit. If the temperature detected by the supply sensor falls below 3 °C, the burner will be ignited.
seconds continuous pumping through the hot water circuit). During this period the status display shows ‘h’. Ttap boiler can be set with the aid of the keys on the display. 25.2 General operation For hot water operation the burner is activated by means of a sensor that is fitted in the hot water cylinder which measures the temperature of the cold water supply tcold.
When the heating demand is removed, the pump continues to run for the pre-set overrun time, at the end of which it is switched off. 25.4 Hot Water Cylinder A hot water cylinder boiler can be directly connected to the EC25HS. The cylinder temperature can be regulated by means of a thermostat or an NTC temperature sensor. When an NTC-sensor is used, the appliance will modulate during the boiler heating cycle.
at both speeds: high speed with the aid of a pressure difference, low speed by means of a temperature increase. If, when the burner is ignited, the pressure rises or falls by more than 0.1 bar within 4 seconds, then the burner will be switched off. The control system then switches to the pump test phase until sufficient pressure difference has been created. For central heating and hot water operation the appliance modulates back when ∆T > 32 °C.
The blocking will only be discontinued when the pressure exceeds 1.3 bar. This offers the possibility to read the pressure in the appliance during topping up. The appliance limitations 0.2 bar < P < 0.5 bar The appliance functions normally but the capacity will be limited to low load. On the status display the normal status will be replaced by ‘A’.
The following status codes may displayed during normal operation. Code . (point) 0 C c d b h o P be Meaning burner in operation ready for use central heating use central heating pump overrun Hot water operation boiler operation Hot water pump overrun frost protection system water pressure If the control system detects a fault, the burner will be switched off and every heating demand will be blocked. The following blocking codes are possible: Malfuncti on code 1 or 1. 2 or 2. 6 or 6. 4 or4. F / F.
Table 15 Control Menu Letter C P Description maximum central heating water temperature overrun time for the central heating pump maximum central heating capacity h hot water supply d1 t1 b2 O/b 3 O/S 3 O/d 3 pre-set hot water temperature tank holding temperature external boiler holding temperature external sensor basic temperature external sensor factor x 10 external sensor reference temperature return to standard setting: by pressing the ‘+’ pushbutton the standard values are restored (apart from h
28. Laptop Connection The EC25 has a special serial connection that can only be used by the installer for diagnosis with a PC. The special cable and software required are available to the installer as an option. Never use a standard cable; this will result in damage to the PC! The software possibilities are: 28.1 Display current status This screen gives the installer the possibility to display an overview of the complete status of the control system.
29. Fault Finding The following fault codes (blocking and interlocking) are saved. The last blocking code is displayed in view mode A. (See Section 27 and table 15). 29.1 Blocking actions Internal number 49, 58 65, 74 43 59 45 61 50 66 30 40 38 36 25, 26, 27, 28 31, 34, 35 39 0 29 41 32 29.
Figure 23 Wiring Diagram Page 46 ECO HOMETEC (UK) LTD.
30.
30.1 Decommissioning the boiler When decommissioning the boiler, precautions should be taken to avoid frost damage. Therefore it is essential that both the boiler and the central heating system are completely drained down. To do this remove the front casing and connect a hose to the central heating drain point. The system should be vented by opening the DHW valve and /or the manual air vent on the central heating circuit.
31. User Instructions 32. Annual Servicing. It is a condition of the boiler warranty that all servicing and maintenance be carried out annually by eco hometec approved engineers only. A service has to be carried out when every 12 months 33. Decommissioning the boiler. When decommissioning the boiler, precautions should be taken to avoid frost damage. Therefore it is essential that both the boiler and the central heating system are completely drained down. 33.
Figure 24 Status Display The display lights continuously. Malfuncti on code 1 or 1. 2 or 2. 6 or 6. 4 or4. F / F. Code F 1 2 3/ 7/E 5 A 7 Meaning Too many ignition attempts Supply sensor failure Too many flame faults detected Control system internal fault Fan malfunction Exhaust gas sensor > 95 °C Gas valve malfunction Press the set/reset key (2). This may end the malfunction. The lock function will then be ended and the malfunction code will disappear from the display.
EC 25 Compact Installation/User Manual page 51
Save gas Save money Only boilers from eco hometec are fitted with Variable Controlled Output eco hometec Unit 11E Carcroft Enterprise Park Carcroft Doncaster DN6 8DD Tel. 01302 722266 Fax. 01302 728634 http://www.eco-hometec.co.uk e.mail.sales@ecohometec.co.
