200H - Solar panel Baxi - Free user manual and instructions

USER MANUAL 200H Baxi

1. Please read these instructions before installing or commissioning

2. Please leave these instructions with the user for later reference.

3. This solar thermal energy system for domestic hot water should only

be installed and handled by competent, authorised personnel. During works, you must obey:

• The legal provisions on accident prevention.

• Environmental legislation.

• All occupational health and safety provisions in force.

• Specic EU safety regulations and the rules and regulations of the individual country. Keep the collector protected from the elements and in its origi- nal packaging until installation. Cover the collector during installation until it is fully operatio- nal, as this will prevent it from reaching high temperatures due to solar radiation. The installer is responsible for ensuring compliance with all specic regulations in the individual country or region. To transport the collector, we recommend handling it in its packaging with the aid of aluminium frames. Do not handle the collector by its hydraulic connections. Protect the collector from knocks or other me- chanical inuences, especially the solar glass, rear of the collector and hydraulic connections. The best orientation of the solar collector is southward; if it is not pos- sible to orient the collector in a southerly position, point it in a westerly direction. The best tilt angle will depend on when the system is used, which may be: a) Constant year-round demand: geographical latitude. b) Demand mainly in the winter: geographical latitude +10°. c) Demand essentially in the summer: geographical latitude -10°. d) Collectors can be installed in installations with an inclination angle (β) comprised between 15º and 75º Avoid any shadows that could a󰀨ect the solar collectors. Losses due to orientation, tilt and possible shadows over the system must be kept at or below the minimum levels permitted in the applicable regulations. All systems will have independent primary (with heat-transfer uid) and secondary circuits. Avoid mixing the di󰀨erent uids. They must all meet the regulations in force and specic legislation on protection against electric shock. Electrolytic sleeves must be installed between parts of di󰀨erent materials to prevent galvanic coupling.

WORKING FLUID The installer or designer will set the minimum allowed temperature of the system. Components located outside must be able to withstand this temperature without permanent damage. The system should be protected against temperatures of 5°C below the lowest historical gure recorded with a non-toxic chemical uid designed for this purpose.4

We recommend the use of a directly applicable mixture of water and gly- col with corrosion inhibitors. Avoid increasing the concentration by large amounts; it should never exceed 50% because this would create a mixture with very high viscosity levels, thereby reducing the heat-transfer properties of the uid. DO NOT mix with any other uids. COLLECTOR INSTALLATION If more than one row is required, the collectors must be installed in a mul- tiple parallel arrangement, preferably with the same number of collectors in each row. Cut-o󰀨 elements will be installed to separate each row. A safety air vent valve will be installed in each row; if an automatic air vent valve is used, a cut-o󰀨 valve will be installed to disable the valve while the system is in operation. We must also ensure that there are no reverse ows, as doing so will prevent energy losses. Freezing point (ºC) -10 -15 -20 -25 -30 -32 -35Glycol concentration (%) 26 33 37 42 47 50 51 Although this uid is non-toxic, odourless and biodegradable, it should be handled with caution. The use of chemical-resistant glo- ves and eye protection is recommended when handling this uid. If the uid comes into contact with the skin, wash with soap and water. In case of contact with the eyes, rinse immediately with plenty of clean running water. m2 5 7.5 12.5 25 l/h*m2 15 20 30 40 60 15 20 30 40 60 15 20 30 40 60 15 20 30 40 60 l/h 75 100 150 200 300 113 150 225 300 450 188 250 375 500 750 375 500 750 1000 1500 min. int. Ø DN13 DN13 DN13 DN16 DN16 DN13 DN13 DN16 DN16 DN20 DN16 DN16 DN20 DN20 DN25 DN20 DN20 DN25 DN25 DN32 Temperature probe Temperature sensors should be installed in such a way as to ensure good contact with the measuring point. They should be insulated from the in- uence of environmental conditions and installed against the ow of the uid The temperature probe will be installed at the hottest point of the output of the corresponding row. Ensure correct installation of the thermal sensor in the collector. Secure the sensor wire with a suitable material to prevent its acci- dental removal from the collector. Special attention must be paid to the maximum temperatures rea- ched in the last collector of the row as the solar liquid may become deteriorated. Pipes The pipes will be as short as possible and allow for complete draining. Horizontal sections will have a minimum slope of 1%. The pipes of the primary circuit may be made of stainless steel or copper and have threa- ded, welded or anged joints. Outdoor pipes must have external pro- tection to enable them to withstand the eect of the weather and avoid transport losses. The recommended sizes of pipe to maintain a pressure drop of less than

2.5 mbar per linear meter are:

Expansion tank An expansion tank will be installed in the primary circuit close to the hy- draulic unit, in line with the size and characteristics of the installation. The size of the expansion tank will be calculated according to DIN 4757, EN 12977 or VDI 6002. This expansion tank will be installed:

1. Such that the temperature of the water touching the membrane is as

2. Preferably in the pump suction line.

3. Cut-o elements should not be installed between the expansion tank

Pumps Where possible, the pump should be assembled in the cooler parts of the circuit, ensuring that there is no cavitation, and always with a horizontal axis of rotation. To calculate the size of pump to install, we must take account of the pres- sure drop in the collectors installed, as well as pipe losses. The rst thing we must do after installation is clean the system to remove any residual welding slag, remover or dirt in the pipes. Use a container large enough to collect the uid. Once the circuit has been ushed, we can start lling the system. The system must be lled without direct sunlight; if this is not possible, cover the collector or collectors during lling and us- hing. Otherwise, there may be a risk of vapour formation.. COMMISSIONING Pressurise the system to 1.5 times the working pressure to detect for leaks. If any leaks are detected, eliminate them all from the system. Alternatively, an air test can be conducted to detect any major losses in the system before ushing and lling with the heat-transfer uid. During lling and commissioning, the system must be completely drai- ned. We recommend re-testing the system during the rst weeks of ope- ration to release any air In case of breakdown or drops in the system, you will need to vent the air again when refilling. NEVER fill the primary circuit with tap water if its properties could lead to the formation of incrustations, deposits or attack on the circuit, or if the circuit needs antifreeze due to the risk of frost or any other additive to function properly. After commissioning, do not forget to close all manual and auto- matic vents. Once the system has been ushed, drained and has the correct pressu- re, we must regulate the ow of the system. To do so, we will need to adjust the pump ow to the lowest possible speed (to minimise electrical consumption) and regulate the ow using a ow meter. Note: Only operate the air vent when the system is cold. During normal operation, the heat-transfer uid reaches high temperatures and can cause severe burns. Check the pH valve at regular intervals to make sure that it is bet- ween 7.5 and 8.5. If the uid is dark or cloudy and the pH value is below 7.0, the heat-transfer uid must be replaced. The percentage of glycol in the heat-transfer uid should be checked every two years. This can be done using a refractometer. Note that the cold pressure in the collectors should be above 2 bar. Since the lling pressure gauge is located in the bottom part of the installation, we must add the static pressure of the system when taking the reading. The maximum permissible temperature for the system is 10 bar. Collector connection The optimal connection (parallel connection) is by crossing over the row of input and output collectors from opposite ends; they can be also connected from the same end of the row of collectors with barely any loss of performance.6 Check the seals and hydraulic connections of the solar collectors to the system. Check the solar collector mounting kit system. Check for leaks in the hydraulic circuit. Check that the heat-transfer uid used in the system is composed of a mixture of antifreeze and water. Check the installation of safety elements: expansion tank and safety valve. Check the connections and operation of the regulation system of the installation. MAINTENANCE TASKS The following lists include the most important maintenance operations for an installation.

1. Check the proper functioning of the system

Perform this checklist during commissioning.

2. Check on general system status

The following checks cover the operations needed to maintain the sys- tem within the acceptable limits of operation, performance, protection and durability. These operations must be carried out by competent technical sta󰀨 with expertise in solar thermal technology and mechanical installa- tions in general. The maintenance register of the system must be kept up to date. The maintenance of systems with a collector area of over 20 m² must undergo inspection at least every six months. Those of less than 20 m² should be inspected on an annual basis.

Check on pump shut-down and start-up di󰀨erential Check of reading of the system's temperature sensors Actions (opening and closing) to check for cut-o󰀨 valve sti󰀨ness Presence of glycol in the collection tray Check on safety valve operation Check on system pressure Check on expansion tank pressure Presence of air inside the system Check on correct operation and cleaning of air valve Inspection to determine deterioration of insulation Pressure test Presence of leaks Pump seal Pump operation while the system is running System ow check Check on refrigerant density using a refractometer Check to ensure that the pH value of the refrigerant is pH>7.5 Degradation, signs of corrosion and bolt tightening Condition of collector xing elements State of repair of roof around the solar system Control of vegetation around the collector Check on ballast tray, where necessary Presence of condensation and dirt Presence of cracks, deformation Presence of corrosion Appearance of leaks Verication of temperature probe mounting Hydraulic circuit: State of repair of the collector support structure and its xing elements: State of repair of collectors: Verication of operating pressures: Security system Regulation system:7