N-SOL SYSTEM SOLAR INSTALLATION INSTRUCTIONS

Transcription

1 N-SOL SYSTEM SOLAR INSTALLATION INSTRUCTIONS

2 2INSTALLATION MANUAL Dear Customer, Thank you for choosing a BERETTA N-SOL natural circulation water heating system. You have purchased an innovative, modern, and quality product that will provide comfort in the home for many years to come. Arrange for your system to be serviced regularly by an authorised BERETTA Technical Assistance Centre. Their personnel are specially trained to keep your system efficient and cheap to run. Technical Assistance Centres also stock any original spare parts that might be required. This instruction manual contains important instructions and precautions that must be observed to ensure the trouble-free installation and efficient functioning of your BERETTA N-SOL solar water heating system. Please accept our renewed thanks for your purchase. Beretta The solar collectors used in BERETTA natural circulation systems conform to EN standard 2975 RANGE MODEL CODE N-SOL System 50/ single N-SOL System 200/ single N-SOL System 50/ double N-SOL System 200/ double N-SOL System 300/ The following symbols are used in this manual: b CAUTION = Indicates actions that require caution and adequate preparation a STOP = Identifies actions that you MUST NOT do This manual, Code Rev. (03/) is made up of 28 pages.

3 CONTENTS GENERAL SAFETY INFORMATION DESCRIPTION OF THE SYSTEM... 5 Description...5 Safety devices...5 Identification...6 System layout...7 Installation on a flat roof...7 Installation on a sloping roof...8 Storage cylinder layout...9 Water circuit...9 Technical specifications...0 Accessories INSTALLER... Unpacking the product... Dimensions and weight...2 Handling...4 Preparing for installation...5 Assembly...6 Assembling the frame...7 Assembling the pipes and water circuit components...8 Preparing for initial start-up...2 Initial start-up...23 Maintenance...23 Checks TROUBLESHOOTING

4 4INSTALLATION MANUAL GENERAL SAFETY INFORMATION b The system is delivered in separate crates. Check that it is complete, undamaged and as ordered as soon as you receive it. Report any discrepancies or damage to the dealer who sold it. b This system must be installed by a legally qualified heating engineer. (In Italy, the law regulating professional heating engineers is Law 46 of the 5th March 990.) On completion of the installation, the installer must issue the owner with a declaration of conformity confirming that the installation has been completed to the highest standards in compliance with the instructions provided by BERETTA in this instruction manual, and that it conforms to all applicable laws and standards. b The system must only be used for the purpose specified by BERETTA and for which it is designed. The manufacturer declines all responsibility, contractual or other, for damage to property or injury to persons or animals caused by improper installation, adjustment, maintenance or use. b If you notice any water or other liquid leaking from the solar heating circuit, disconnect the system immediately from the mains electricity supply, shut off the water supply, and notify BERETTA's Technical Assistance Service or a qualified heating engineer immediately. b The liquid in the solar heating circuit can reach VERY HIGH TEMPERATURES, in excess of 50 C. Beware of burns. b Only use the anti-freeze liquid provided by BERETTA to fill and top up the system. BERETTA anti-freeze contains nontoxic, biodegradable and environmentally friendly propylene glycol, and is specially designed for use in solar water heating systems. b Make sure that the water-glycol mix in the primary circuit is able to resist the minimum temperatures likely to occur in the place of installation (e.g.: 40% glycol resists freezing down to -20 C). b The system must be serviced at least once a year. b Make sure that the roof is strong enough to support the weight of the system when filled with water. Also make sure that the section of roof chosen for the installation is at a suitable angle to the sun (south facing or at a maximum angle of 45 to the southeast or south-west), and not shaded during the day by tall plants, trees, other houses, mountains, etc. b Insulate the domestic hot water pipes (hot and cold) with suitable material for local conditions. In particularly cold climates, insulate all externally mounted accessories. In areas subject to severe frosts, configure the system so that the pipes can be drained if the system is not used during the winter months. b If the system is installed in an area subject to strong winds or gusts, secure it at suitable points. If necessary, tie down the storage cylinder and solar collectors with metal straps and install supporting brackets at the sides. b Make sure that snow cannot build up behind the storage cylinder since this could place unacceptable static strain on the roof. b The installation of a natural circulation solar water heating system modifies the existing structure of the roof. With certain types of roof, especially those over converted lofts, it may be necessary to adopt additional precautionary measures to prevent water from infiltrating the roof in windy or snowy conditions. b Use a suitable sling to lift and move the solar collector. The collector must not be lifted by its fittings. Avoid subjecting the collector to impacts or mechanical strain, and take care to protect the glass panel. a Never attempt to install solar collectors on roofs without ensuring that all applicable standards governing safety at work are met first. a Never install solar collectors on roofs without an adequate lightning protection system. a Never install the system without providing a suitable drain for the solar heating circuit's safety valve. a Never clean or service the system without first disconnecting it from the mains electricity supply by turning the main power switch and the control panel switch OFF. a Do not tamper with or adjust the safety or control devices without prior authorisation and instructions from the manufacturer. a Never stop circulation in the solar heating by means of valves or cocks. a Do not dispose of packaging material into the environment, or leave it within the reach of children, since it can become a potential hazard. Dispose of packaging material in compliance with applicable legislation.

5 2 DESCRIPTION OF THE SYSTEM 2. Description The N-SOL is a natural circulation, domestic water heating system for single homes, designed for installation on flat or sloping roofs. It comes with all the parts necessary for a complete installation, including all the accessories required for a quick start-up: - solar collector/s - solar storage cylinder with heating jacket - mounting frame for collector/s and storage cylinder - connections between the solar collector/s and the storage cylinder, complete with nonreturn valve and safety valve - anti-freeze liquid (accessory). 2.2 Safety devices The system is equipped with the following safety devices: - A primary circuit safety valve that opens if pressure in the primary circuit rises above a 2.5 bar threshold. - A secondary circuit safety valve that opens if pressure in the secondary circuit rises above a 0 bar / 99 C threshold. b Water may come out of the primary and secondary circuit safety valves as a result of variations in temperature and pressure during the course of the day. Make sure that there is a suitable drain for any water coming from these valves. b The operation of a safety device indicates a potentially dangerous malfunction in the system, and means that you must contact BERETTA s Technical Assistance Service immediately. 5 b Safety devices must only be replaced by BERETTA s Technical Assistance Service using original spare parts. b Over-temperature protection requires an adequate supply of cold water.

6 6INSTALLATION MANUAL 2.3 Identification N-SOL BERETTA systems are identified by two plates: System data plate This shows the model, product code, serial number, year of manufacture, storage cylinder capacity and DHW circuit operating pressure. Beretta Caldaie Via Risorgimento, Lecco (LC) SISTEMA SOLARE A CIRCOLAZIONE NATURALE NATURAL CIRCULATION SOLAR WATER HEATING SYSTEM Mod. Cod. UAC Serial N Tipo/Type Anno Year Capacità bollitore Storage cylinder capacity Pressione di progetto acqua sanitaria DHW circuit operating pressure Pressione max circuito solare Max solar heating circuit pressure l bar bar La protezione da sovratemperatura dipende dalla fornitura di acqua fredda sanitaria Over-temperature protection requires an adequate supply of cold water EAF Collector data plate This lists the technical specifications and performance of the solar collector. Code Year of production Serial Number Description Flat plate solar collector Dimensions Gross area Aperture area Absorber area Empty weight CODICE : S/N : 08xxxxx DESCRIZIONE : CP20TN FABBRICATO IN ITALIA da RIELLO S.p.a. COLLETTORE SOLARE PIANO DIMENSIONI : 856X086X75 mm SUPERFICIE LORDA : 2,02 m 2 MAX PRESSIONE ESERCIZIO : 0 bar TEMP. MASSIMA : 36 C SUPERFICIE DI APERTURA :,8 m 2 CONTENUTO LIQUIDO :,3 l SUPERFICIE ASSORBITORE :,76 m 2 MAX CONCENTRAZIONE GLICOLE : 50 % PESO A VUOTO : 32 kg LIQUIDO TERMOVETTORE : ACQUA+GLICOLE PROPILENICO COLLEGAMENTO IN SERIE FINO AD UN MASSIMO DI 6 COLLETTORI Made in Italy by Riello S.p.A. Maximum operating pressure Stagnation temperature Liquid content Max glycol concentration Heat transfer fluid: water+propylene glycol Up to max 6 collectors can be connected Fig. 2. b If these plates or any other means of clearly identifying the product are defaced, removed or lost, proper installation and servicing may be rendered difficult

7 2.4 System layout Installation on a flat roof N-SOL 50/ - 200/ (*) FRONT VIEW SIDE VIEW N-SOL 300/2 7 Primary circuit safety valve (2,5 bar) 2 Domestic hot water outlet - 3/4" 3 Non-return valve - Secondary circuit safety valve (0 bar / 99 C)) 4 Domestic cold water inlet - 3/4" 5 Domestic cold water inlet cock 6 Solar collector outlet pipe 7 Collector/s 8 Plug 9 Filling/drain cock 0 Solar collector return pipe Storage cylinder 2 Mounting frame (*) (Not supplied. To be provided by installer). Fig. 2.2

8 8INSTALLATION MANUAL Installation on a sloping roof (*) N-SOL 50/ - 200/ N-SOL 300/2 FRONT VIEW SIDE VIEW Primary circuit safety valve (2,5 bar) 2 Domestic hot water outlet - 3/4" 3 Non-return valve - Secondary circuit safety valve (0 bar / 99 C)) 4 Domestic cold water inlet - 3/4" 5 Domestic cold water inlet cock 6 Solar collector outlet pipe 7 Collector/s 8 Plug 9 Filling/drain cock 0 Solar collector return pipe Storage cylinder 2 Mounting frame (*) (Not supplied. To be provided by installer). Fig. 2.3

9 Storage cylinder layout Insulated storage cylinder 2 Flange 3 Temperature sensor socket (/2 ) 4 Fitting for electrical heating element (accessory) 5 Flange cover 6 Magnesium anode Fig Water circuit 9 UAC heat exchange 3 EAF heat exchange Connections to be made by the installer Primary circuit safety valve (2.5 bar) 2 Non-return valve - Secondary circuit safety valve (0 bar / 99 C) 3 Storage cylinder 4 Collector 5 DHW tank (secondary circuit) 6 Primary circuit 7 Temperature sensor socket 8 Magnesium anode 9 Primary circuit filling/drain cock 0 Disconnect valves Insulation 2 DHW circuit expansion vessel 3 Pressure reducer 4 Softener filter 5 Drain Fig. 2.5

10 INSTALLATION MANUAL Technical specifications Description N-SOL 50/ N-SOL 200/ N-SOL 300/2 Collector Collector surface area 2,02 x 2,02 x 2 m 2 x n pan. Exposed area,8 x,8 x 2 m 2 x n pan. Absorption area,77 x,77 x 2 m 2 x n pan. Liquid content,35 x,35 x 2 l x n pan. Connections for compression fittings, Ø 22 mm Maximum permitted pressure 0 bar Stagnation temperature 36 C Dimensions 856 x 086 x 75 mm Empty weight 32 Kg Storage cylinder Type jacket Capacity l Dimensions (complete with insulation) 90 x Ø x Ø x Ø 534 mm Empty weight Kg Max DHW circuit pressure 0 bar Max solar heating circuit pressure 2,5 bar Water fittings (solar heating - DHW) 3/4" M Fitting for electrical heating element " /4 F Magnesium anode 22x300 22x300 22x400 Øxmm Complete system Storage cylinder l Collectors 2 n Recommended load range l/day Heat transfer liquid content 8,5 3,6 20,3 l 2.7 Accessories The following accessories are available, to be ordered separately: ACCESSORY CODE.5 kw - "/4 electrical heating element kit Glycol anti-freeze (5 kg) Glycol anti-freeze (2.5 kg) Thermostatic mixer valve " Bracket kit for natural circulation l FR Bracket kit for natural circulation l SR Bracket kit for natural circulation 300 l FR Bracket kit for natural circulation 300 l SR Omega bracket kit l Omega bracket kit 300 l

11 3 INSTALLER 3. Unpacking the product First pallet One system per pallet N-SOL systems come in two separate packages. The actual contents of these vary according to the number of collectors, the capacity of the solar storage cylinder and the size of the mounting frame. Contents of first pallet: - Solar collector/s - Storage cylinder - Water fittings - The following items are delivered in a plastic bag: - Instruction manual - Warranty certificate and barcode label - Serial number plate. - Glycol Two systems per pallet Fig. 3. Second pallet Contents of second pallet: - Pipes - Mounting frame. b The instruction manual is an integral part of the N-SOL system. Read it thoroughly and keep it safe. b Store both pallets in a dry area, well away from the rain. Fig. 3.2

12 INSTALLATION MANUAL 3.2 Dimensions and weight SYSTEM LAYOUT (installation on a flat roof) N-SOL 50/ - 200/ 896 L H N-SOL 300/ L Fig. 3.3 Description N-SOL 50/ N-SOL 200/ N-SOL 300/2 Empty weight ~06 ~6 ~76 Kg Full weight ~268 ~332 ~474 Kg L mm H mm

13 SYSTEM LAYOUT (installation on a sloping roof) N-SOL 50/ - 200/ H L N-SOL 300/ L Fig. 3.4 Description N-SOL 50/ N-SOL 200/ N-SOL 300/2 Empty weight ~96 ~06 ~69 Kg Full weight ~258 ~322 ~467 Kg L mm H mm

14 INSTALLATION MANUAL 3.3 Handling Once you have removed the outer packaging, proceed as follows to unpack and handle the solar collector: - Remove the PVC wrapping to free the solar collector from the pallet - Tilt the solar collector slightly and grip it at the four points shown (A) to lift it - Use a hoist or other suitable lifting equipment to hoist the solar collector on to the roof. a Do not lift the solar collector by its fittings. A A A A Fig Fig. 3.6 Lift and move the storage cylinder in a horizontal position. Make sure that the slings and lifting gear used are suitable for the weight. a Do not lift the storage cylinder by its fittings. a Do not dispose of packaging material into the environment, or leave it within the reach of children, since it can become a potential hazard. Dispose of packaging material in compliance with applicable legislation. b Wear suitable personal protective equipment and use suitable safety devices. Fig. 3.7

15 3.4 Preparing for installation Before you start assembling the solar water heating system, check: - hat the contents are all present and undamaged - that the roof is strong enough to support the weight and that there are no leaks - the best possible orientation of the solar collectors (ideally facing south). Avoid locating collectors in the shadow of tall trees, etc. - that the installation surface is stable. Remove any gravel and similar material. b Replace any defective parts immediately, using only manufacturer s original spare parts. > m > m b Arrange for any major roof repairs, especially bitumen waterproofing, to be performed by specialists. Fig. 3.8 Before commencing installation, make sure that there is a minimum distance of one metre between the mounting frame and the edge of the flat roof. 5 b The above measurements only indicate the net width required for the assembled collectors. Allow at least another 0.5 metres to the right and left of the assembled collectors for the necessary piping. b Keep the left of the storage cylinder some 0 to 20 mm higher than to the right to facilitate bleeding. When installing the collector parallel to a sloping roof, use the adjuster nuts on the roof fixing brackets. (See the relevant instructions.) ~ 0-20 mm Fig. 3.9

16 INSTALLATION MANUAL Assembly GENERAL INSTRUCTIONS Instructions for assembly The system must be installed by specialist personnel. Use only the assembly material supplied. The supporting framework and all masonry or brickwork fixing points must be checked by a person expert in static loading, and must be suitable for the nature of the installation site. Static load The system must only be installed on roofs or frames that are strong enough to support its weight. The static load capacity of the roof or any supporting structure must be verified on site prior to the installation of the system. Take special care to make sure that the roof timbers are suitable for the fixing screws of the natural circulation solar water heating system. The constructor of the roof structure must verify that the roof conforms to all applicable laws and standards in the country of installation, especially in areas subject to heavy snowfall or strong winds (note: m³ of dry snow weighs ~ 60 kg / m³ of wet snow weighs ~ 200 kg). When installing systems in such areas, all weather features that might add to the strain on the roof must be taken into consideration (Foehn effect, funnel effect, vortex formation, etc.). Water connections Water connections must conform to DIN standards 988 and (Also respect all applicable national standards!) All unused fittings must be plugged. The operating pressure limits specified on the data plate must never be exceeded. It may prove necessary to fit a pressure reducer. It is essential to fit the storage cylinder with the safety valve provided to limit overpressure in the water circuit. A thermal mixing valve must always be connected to the hot water outlet to control water temperature in the DHW circuit. Flushing and filling For safety reasons, fill the system either when the sun is not shining or after having covered the collectors. Always fill the storage tank with domestic water before filling the solar heating circuit. Use a 25% anti-freeze to water solution, especially in areas at risk of frost. b The anti-freeze solution must be mixed with water prior to filling the system. Indication: 25% anti-freeze solution --> freezing point: -0 C Lightning protection / building potential compensation It is generally not necessary to connect natural circulation systems to the building s lightning protection system. (Make sure, however, that you conform to all relevant national standards!) If you are installing a system over a metallic roof frame, consult an authorised lightning protection specialist. The metal piping of the solar heating circuit must be connected to the main potential compensation bar by a (yellow-green) copper wire (H07 V-U or R) of at least 6 mm2. Alternatively, the solar collector piping may be connected to ground via a ground wire sunk into the earth. This ground wire must be routed outside the building. The ground wire must be connected to the potential compensation bar through a wire of the same diameter. Solar panel connections The collectors must be connected to each other and to the connecting pipes by means of a lock ring connection. Use a grip or wrench to hold the fixed part of the union steady while tightening the pipe union, to avoid damaging the absorber. Make sure that the pipes connecting the collector to the hot water storage cylinder always slope upwards. It is essential to fit the safety valve provided to limit overpressure in the solar water heating circuit. It may not be possible to completely empty the collectors once filled. For this reason, in areas at risk of freezing, the collectors must be filled with a solution of water and anti-freeze even for functioning and pressure tests. Operating pressure Maximum operating pressure for the solar water heating circuit is 2.5 bar, while that for the DHW circuit is 0 bar. Bleeding Bleed the system at the following intervals: - On start-up (after initial filling) - 4 weeks after start-up - Whenever necessary, as in the event of system malfunctioning. b The heat transfer liquid can be hot! Risk of scalding! Only open the vent valve if the temperature of the fluid in the circuit is below 60 C. Make sure that the collectors are cold before you bleed the circuit. Cover the solar collectors before bleeding the circuit. Perform bleeding in the morning if possible.

17 Assembling the frame b Two persons are needed to assemble the system in its entirety. Follow the instructions provided with the mounting frame to assemble it. INSTALLATION ON A FLAT ROOF N-SOL 50/ - 200/ N-SOL 300/2 7 INSTALLATION ON A SLOPING ROOF N-SOL 50/ - 200/ N-SOL 300/2 Fig. 3.0

18 INSTALLATION MANUAL Assembling the pipes and water circuit components INSTALLATION ON A FLAT ROOF N-SOL 50/ - 200/ A B N-SOL 300/ A 8 4 B Fig. 3. b A drain hose (not supplied) must be connected to the outlets of the safety valves (2) and (3).

19 Proceed as follows to assemble N-SOL systems: - Fit the elbows () and (7) to the storage cylinder. - Assemble the collector outlet piping (A) including the pipe (2), union (3), pipe (4), T-union (5) and cock (6), then fit the assembled piping to the storage cylinder and collector. - Assemble the storage cylinder return piping (B) including the pipe (8) and elbow (9), then fit the assembled piping to the storage cylinder and collector. - Fit the plugs (0) and () to the unused collector fittings. - Fit the safety/non-return valve (3) to the cold water inlet on the storage cylinder. - Connect up the storage cylinder s DHW inlet and outlet. - Fill the system as instructed in the section "Preparing for initial start-up", then fit the safety valve (2) to the storage cylinder. b The domestic hot water circuit MUST include an expansion vessel and a storage cylinder drain cock. b The safety valves must be connected to a suitable collection and drain system. The manufacturer declines all responsibility for damage caused by water escaping from the safety valves. b The choice of system components and the method of their installation are left up to the heating engineer installing the system. Installers must use their expertise to ensure proper installation and functioning in compliance with all applicable legislation. 9

20 INSTALLATION MANUAL INSTALLATION ON A SLOPING ROOF N-SOL 50/ - 200/ B A N-SOL 300/ A B 9 0 Fig. 3.2 b A drain hose (not supplied) must be connected to the outlets of the safety valves (2) and (3).

21 Proceed as follows to assemble N-SOL systems: - Fit the elbows () and (7) to the storage cylinder. - Assemble the collector outlet piping (A) including the pipe (2), union (3), pipe (4), T-union (5) and cock (6), then fit the assembled piping to the storage cylinder and collector. - Assemble the storage cylinder return piping (B) including the pipe (8) and elbow (9), then fit the assembled piping to the storage cylinder and collector. - Fit the plugs (0) and () to the unused collector fittings. - Fit the safety/non-return valve (3) to the cold water inlet on the storage cylinder. - Connect up the storage cylinder s DHW inlet and outlet. - Fill the system as instructed in the section "Preparing for initial start-up", then fit the safety valve (2) to the storage cylinder. b The domestic hot water circuit MUST include an expansion vessel and a storage cylinder drain cock. b The safety valves must be connected to a suitable collection and drain system. The manufacturer declines all responsibility for damage caused by water escaping from the safety valves. b The choice of system components and the method of their installation are left up to the heating engineer installing the system. Installers must use their expertise to ensure proper installation and functioning in compliance with all applicable legislation Preparing for initial start-up 2 FLUSHING THE SYSTEM Carefully check all connections and unions for leaks before filling the system with the water and glycol mix. Use the following procedure to test for water tightness. The same procedure can also be used to flush out the closed circuit to remove any residues. - Connect the hose union on the filling/drain cock () to a cold water tap using a length of hose pipe. - Connect the union (2) on the storage cylinder to a drain. - Open the cock () and the cold water tap and leave water flow into the solar heating circuit for a few minutes. - Close the cold water tap and the cock (). - Check all connections and unions for leaks. Fig. 3.3

22 INSTALLATION MANUAL 22 FILLING THE SYSTEM The anti-freeze supplied contains non-toxic, biodegradable and environmentally friendly propylene glycol. Mix the propylene glycol with water (preferably demineralised), by pouring the glycol into a container of water and not vice-versa. Establish the necessary concentration of glycol using the table alongside. The temperatures given in the table define the level of anti-freeze protection provided. b Fill the domestic hot water tank before filling the solar heating circuit. a DO NOT fill the collector circuit under sunny conditions or when the collectors are hot. FILLING THE TANK - Open and leave open the cock (5) on the domestic cold water inlet, to be provided by the installer. - Open a hot water user tap and fill the storage cylinder with cold water from the mains supply. When water starts coming out of the hot water user tap, leave it run until you obtain an even flow then close the tap. The storage cylinder is now full. Anti-freeze Temperature Density (20 C) 50% -32,4 C,045 kg/dm 3 40% -2,5 C,038 kg/dm 3 30% -4,0 C,029 kg/dm 3 20% -7,8 C,08 kg/dm 3 8% -6,8 C,06 kg/dm 3 5% -5,5 C,03 kg/dm 3 UAC EAF 5 Sc Fig. 3.4 FILLING THE SOLAR HEATING CIRCUIT Filling with a pump - Premix a sufficient volume of water and glycol solution in a suitable container, selecting the right concentration according to the table above. - Use lengths of rubber hose to connect a pump between the container and the hose union on the filling/drain cock (). Open the cock. - Start up the pump and fill the solar heating circuit until the heat transfer fluid starts to flow out of the fitting (2) at the top of the storage tank. - Close the cock (). - Fit the safety valve (3) to the fitting (2). 3 2 Fig. 3.5

23 3 2 Keep higher than the storage cylinder Gravity filling - Premix a sufficient volume of water and glycol solution in a suitable container, selecting the right concentration according to the table above. Position the container above the storage cylinder. - Use a length of rubber hose to connect the container to the filling/drain cock (). Open the cock. - Fill the solar heating circuit under gravity until the heat transfer fluid starts to flow out of the fitting (2) at the top of the storage tank. - Close the cock (). - Fit the safety valve (3) to the fitting (2). The system is now ready to start up. Uncover the collectors and clean the glass panels. The solar water heating system will begin functioning automatically. Fig. 3.6 b If a pressure in excess of 2.5 bar builds up in the solar heating circuit, the safety valve opens. It is not possible to control the direction in which steam is released. Therefore, avoid standing near the safety valves while the system is functioning. 3.7 Initial start-up 23 Perform the following steps before starting up the system. Once the N-SOL system has been filled and the necessary tests have been completed: - Make sure that the domestic cold water inlet cock is open. - Check the system for leaks. 3.8 Maintenance b The solar water heating system must be serviced periodically by BERETTA's Technical Assistance Service or by a qualified heating engineer. Once a year check the collectors and the storage cylinder visually for any damage and accumulated dirt, and check that there are no leaks. Check the level and concentration of the antifreeze solution every two years. At least every two years have the storage cylinder checked and cleaned by a qualified heating engineer. Clean the storage cylinder more frequently in areas with hard or very hard water, and in areas subject to major temperature variations.

24 INSTALLATION MANUAL Proceed as follows to clean inside the storage cylinder: - Close the domestic cold water inlet cock. - Connect a hose to the storage cylinder drain cock (Sc) fitted on installation, and open the cock. Leave the water run out until the tank is completely empty. UAC EAF Sc Fig Unscrew the fixing screws and remove the flange cover () from the left of the storage cylinder. - Remove the nuts (2) and screw the bolt (3) in to release the flange (4) from the tank. - Remove the flange (4). Check and clean the inside of the tank. - Check the condition of the seal (5). Replace as necessary. - Check the anode (6) for wear and replace it if necessary. - On completion of cleaning, follow the above steps in the reverse order to refit all removed parts b Screw the bolt (3) out until the flange fits snugly against the tank. Tighten the nuts (2) to secure the flange (4), proceeding diagonally around the flange to apply pressure uniformly around the seal. Fig

25 2 For certain maintenance operations (such as the replacement of pipes or unions) the solar heating circuit (primary circuit) may have to be drained. Proceed as follows: - Connect a hose to the hose union on the filling/drain cock (). - Open the cock (). - Remove the safety valve (2) to allow air into the primary circuit and allow the heat transfer fluid to flow out. Fig. 3.9 b In areas where there is a significant risk of freezing, take particular care over tightness testing and flushing with water. a DO NOT drain the collector circuit under sunny conditions or when the collectors are hot. 3.9 Checks 25 DESCRIPTION Collector circuit Collector circuit tightness test Safety valve check Solar heating circuit bleeding Solar collectors Visual check of collectors Collectors cleaned if necessary Check of collector fixing points Visual check of roof impermeability Visual check of insulation/lagging OK On completion of the installation, perform the checks listed in the table below. Checking the heat transfer liquid Check the anti-freeze effect and the ph level of the heat transfer liquid every 2 years. - Use an instrument like a refractometer or densimeter to check the effectiveness of the anti-freeze (which must have a nominal protection value of approx. -30 C). If protection falls below the threshold of -26 C, replace the mix, or add anti-freeze as required. - Use litmus paper to check the ph (nominal value approx. 7.5). If the measured value is below 7, change the mix.

26 INSTALLATION MANUAL 4 TROUBLESHOOTING FAULT No or insufficient domestic hot water production CAUSE Unusually high draw of DHW. Water leaks in the DHW distribution circuit The solar panels are dirty or covered in leaves, or buildings or other obstacles have appeared after the installation of the system and are blocking out the rays of the sun. The level of heat transfer liquid in the circuit has dropped as the result of leaks from the unions in the circuit or because of over-temperature during extended periods of disuse Air bubbles have formed inside the closed circuit and are impeding natural circulation. - Check. - Check. - Clean. SOLUTION - Top up the circuit with water/glycol mix and bleed any air out. - Bleed the circuit by loosening the uppermost union on the short pipe until liquid comes out. - Top up to replace any lost liquid. 26 Vibrations Loose screws - Tighten the screws The supplementary electric heating element (accessory) is not working - Turn the heating element off at its switch and call BERETTA s Technical Assistance Service

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28 Cod Via Risorgimento, Lecco (LC) Servizio Clienti * Assistenza Tecnica Numero Unico * The manufacturer strives to continuously improve all products. Appearance, dimensions, technical specifications, standard equipment and accessories are therefore liable to modification without notice.