INSTALLATION MANUAL & USERS MANUAL
Contents
1. 9 10 DELS 200 2217 5 300 2 200 E S 10 PING UNED ROO kc teer erben tei pectine ne cua ten 12 ASSEMBLY INSTRUC TIO NS FOR SYSTEM S WITH 1 12 MODELS 120 1 175 120 1 200 150 1 200 150 1 250 200 1 200 200 1 250 200 1 270 12 O XINC EINIEDIROOFSTIEES 14 ASSEMBLY INSTRUC TIO NS FOR SYSTEM S WITH 2 14 MODELS 200 2 175 300 2 200 atis wit idR bite Ro bebida 14 9 CHECKLSTFOR INSTALLER 16 CR C 17 TIIMAINTENANC EINSIRUC TIO NS uev dace ices t dun tu 17 1 Observance of the instructions and standards 1 1 It is very important to follow these installation operating and maintenance instructions in order to avoid danger of death injury property damages and to have your device functioning properly in the long run The company that manufactured and or supplied this solar system has no liability for the installer and or the user in case these instructions have not2. been followed carefully 1 2 Whether further information or clarifications are needed please contact the supplier of the product 1 3 This solar system has been manufactured and tested under the European standards EN 12975 1 Thermal solar systems and components Solar collectors part 1 General requirements EN 12975 2 Thermal solar systems and components Solar collectors part 2 test methods EN 12976 1 Thermal solar systems and components Factory made systems part 1 General requirements EN 12976 2 Thermal solar systems and components Factory made systems part 2 Test methods 2 Description of solar system and components 2 1 General Description This solar system is a closed loop thermosiphon unit which delivers hot water for domestic use It consists from the collector the accumulation tank the support system the hydraulic accessories and the thermo convention liquid Four nominal sizes of accumulation tanks are combined with four different sizes of collectors as the table below MODEL TANK NOMINAL SIZES COLLECTOR NOMINAL SIZES 200 1 270 200 2 175 300 2 200 Other combinations are available upon request 2 2 Collector The collectors are manufactured 4 sizes with nominal area of 1 75m 2 00m 2 50m 2 70m The absorbers of the collectors are made by copper tubes and the fins area by copper or aluminum fins selective or non selective The fins are welded to the tubes by ultr
3. SOLE S A INSTALLATION MANUAL amp USERS MANUAL DOMESTIC SOLAR WATER HEATER EUROSTAR THERMOSIPHON SYSTEM CLOSED CIRCUIT MODELS EUROSTAR 120 1 175 120 1 200 150 1 200 150 1 250 200 1 200 200 1 250 200 1 270 200 2 175 300 2 200 INDEX serens 1 1 Observance of the instructions and 5 2 2 Description of solar system and 2 UU E 2 PAPA ONG CUO R P 3 23 Accumulation tank CC VIING bh RAUS Ed repe a lac FEN ma D SEU DIU 3 2 iA IUE E o TET 4 2 5 Ih mno conventonp Tig DR 6 3 WARNING 5 6 4 7 zB Fresen 8 ASSEMBLY INSTRUC TIO NS FOR SYSTEMS WITH 1 8 MODELS 120 1 175 120 1 200 150 1 200 150 1 250 200 1 200 200 1 250 200 1 270 8 OFEA TROO Fr C 10 ASSEMBLY INSTRUC TIO NS FOR SYSTEMS WITH 2
4. _ _ _ EN 28 Nut M8 DIN 934 8 St steel angles 32 x 45 x 45mm _ _ me 2 e e ve ve eee OPTIONAL 30 Decorativecover990mm 1 1 1 d SiDeombecoerzomm 32 Decorativecoveri250mm 1 1 11 11 Required quantities for flat roof inclined roof tiles All the other quantities are the same for flat roof or inclined roof installation 2 5 Thermo convention liquid The thermal energy collected from the solar irradiation by the collector s is transferred to the heat exchanger of the tank by the thermoconvention liquid which is naturally recirculated by the thermosiphonic principle in the closed loop system The jacket type heat exchanger is heating the domestic consumption water The solution contains inhibitors for antirust protection and propylenoglycol for antifreeze protection up to 15 C If lower temperature protection is needed please consult your supplier The solution is a non toxic non flammable chemical liquid however normal protection measures should be taken during handling Keep it away from children Eyes protection Protective glasses must be used okin protection PVC or rubber gloves must be used In case of contact with eyes wash eyes with plenty of water for 15 minutes with open eyelids In case of contact with skin simply wash with water and soap Physical Properties Phase liquid Color Li
5. asonic or laser welding The frame of the collector is made by extruded aluminum epoxy oven painted to resist ambient conditions The glass cover is a prismatic securi glass of 4mm thickness for maximum penetration of solar irradiation At the back and sides of the absorber there is sufficient insulation of rock wool and glass wool to minimize heat loses and resist stagnation temperatures Technical data of collectors as the table below 175 200 250 270 Width mm 1000 1175 1248 86 86 86 86 Depth mm Weight kg Stagnation temperature 100 140 C depending on selected by client type of absorber s fins Test pressure 10 bar Operating pressure 6 bar 2 3 Accumulation tank cylinder The solar accumulation tank is an indirect double circuit hot water horizontal cylinder The inner surface is enameled at 850 C to guarantee potable sanitary water for long life Additionally it is protected against rusting with a large magnesium anode The ecologic polyurethane foam insulation guaranties minimum thermal loses even at very low ambient temperatures The external cover of the tank can resist any extreme weather conditions for life The internal jacket type heat exchanger with large surface guaranties the energy transfer to the domestic hot water The hot water exits from the hottest zone level of the tank At the same time equal quantity of cold water enters the tank at the coldest zone level The solar tank ca
6. ater piping should withstand temperature of 95 C at pressure 10 bar 4 2 The cold and hot water piping should be well insulated to eliminate heat losses and prevent as possible freezing The insulation material should withstand weather conditions like rains snow and solar irradiation 4 3 On the hot water supply piping install a reliable thermostatic mixing valve set at 55 C to 60 C to prevent higher temperature hot water to reach the consumption points 5 FLAT ROOF ASSEMBLY INSTRUCTIONS FOR SYSTEMS WITH 1 COLLECTOR MODELS 120 1 175 120 1 200 150 1 200 150 1 250 200 1 200 200 1 250 200 1 270 Assembly steps 5 1 Open the pack of the support system Identify the items from table page 5 and the drawing next page 5 2 Assembly the parts between themselves using the set of bolts and nuts included in the pack At this stage do not fasten tight the bolts 5 3 Fix collector on support as shown on drawing using the M6X20mm bolts and washers Do not fasten tight yet 5 4 Position the tank on supports Two people are needed to handle it from each end Fasten well with the 2 bolts M10X30 the tank on the support system The 2 bolts are already mounted on the tank and have to be temporarily removed before placing the tank on the support 5 5 fasten well the collector on support and then fasten well all the parts of the support system among themselves 5 6 the floor with 10mm drill at the 4 fixing points inse
7. e sure that this kind of fixing is suitable to withstand at least 120 Km hr wind speed If in doubt consult your supplier or your engineer for possible alternative way of fixing Fix collector on support as shown on drawing using the M6X20 bolts and washers Do not fasten tight yet Position the tank on supports Two people for 200 Itr and four people for 300 Itr are needed to handle it from each end Fasten well with the 2 bolts M10X30 the tank on the support system The 2 bolts are already mounted on the tank and have to be temporarily removed before placing the tank on the support Now fasten well the collector on support and then fasten well all the parts of the support system among themselves Connect the insulated copper or plastic pipes at closed loop system The long pipe is for cold return to bottom of collector The short pipe is for hot supply from top of collector Make sure that you fasten well the 2 compression fittings in order to tight the closed loop Fix and fasten well the 2 compression end caps on the 2 remaining open ends of the collector Connect the non return pressure safety valve on the cold water inlet of tank making sure that the arrow is pointing towards the tank upwards Connect cold water supply using always a shut off water valve Make sure the pipes are well insulated Connect hot water outlet piping to consumption points is strongly recommended to install a thermostatic mixing valve set at 50 55 C
8. es when you are handling the support system in order to avoid danger of injuring the hands DANGER OF INJURY 3 6 The collectors when exposed to solar irradiation during installation get very hot above 120 C in 2 3 minutes There is danger of burning the hands when touching the copper piping outlets You must leave the carton package cover ON the glass until completion of the installation or you must use thermo resistance gloves DANGER OF INJURY 3 7 If you are using hands to position the tank on the support system at least 2 people are needed for systems 120 150 200 and 4 people for 300 It is preferred to use a crane In this case make sure that the pulling belts are on each side between the piping outlets of the boiler so that it cannot slip 6 3 8 In cases where the solar system is large and the hot water consumption is low the hot water in the solar tank may reach temperatures up to 90 C In this case there is danger of burns for the user especially for children It is strongly recommended to install a thermostatic mixing valve set at 55 60 C anywhere at the hot supply piping and before the hot outlets of the building before taps showers e t c 3 9 If the solar system is equipped with the optional electric immersion heater the electrical connection should be done by a fully licensed electrician following the national rules for electric installation The immersion heater is single phase 230 Volt of 2kw or 3 Kw or 4 Kw po
9. ght red Odor nearly odorless Specific gravity at 20 1 03g cm Freezing point 15 C Boiling point 106 C Packing Containers of 12 Itr for 120 and 150 Itr tanks 18 Itr for 200 Itr tanks 25 ltr for 300 Itr tanks 3 WARNINGS Before starting installation the installer should read and observe carefully the following warnings in order to avoid danger of death injury or property damages 3 1 You may elevate on roof the parts of the solar system ONLY when an internal staircase of enough width exists in the building reaching the roof Otherwise you must use a proper CRANE to elevate the parts It is not allowed to stand at the edge of any roof flat or inclined and pull by ropes any part DANGER OF DEATH 3 2 The collectors have a large surface exposed to wind NEVER install a system with strong winds Choose a calm day DANGER OF DEATH or heavy injury 3 3 If the installation will be on an inclined roof tiles there is danger of slipping Use always SAFETY BELTS securely fastened from a higher position of roof DANGER OF DEATH 3 4 After completion of the installation make sure that all bolts and nuts are fastened well and the whole system is securely fastened to the roof The support system can withstand air velocities up to 120 km hr Make sure that the fastening on roof can withstand as well at least same air velocity DANGER OF DEATH 3 5 Frequently some parts of the support systems have sharp edges Use always glov
10. k omall partitions of the piping is allowed to be horizontal but never descending to the tank This will allow the air bubbles to move towards the tank in the internal expansion tank and would not obstruct recirculation The closed loop system is operating properly This can be identified after one hour of sun shine by touching the hand on the hot inlet of tank from top of collector and at the same time on the cold outlet to bottom of collector There must be a significant temperature difference which means that the natural recirculation is functioning There is no leakage at the closed loop or open loop circuit All bolts and nuts of the support system have been tightened very well and that the fixing on roof is made properly to withstand strong winds Cold supply and hot return piping are properly installed and secured so that the wind will not move them They should be properly insulated with a certified insulation material of minimum thickness 9mm and maximum thermal conductivity of 0 037 W m K The optional electric heater is functioning properly and the thermostat is set maximum at 55 C to 60 C You have explained to the users the operation of their solar system and the capabilities of the installed model You have signed and delivered to the owner the guarantee 16 10 OPERATION INSTRUCTIONS Your solar heater is a two circuit system The primary circuit recirculates from collectors to a heat exchanger inside the tank
11. les are coming out so filling is completed 5 13 Screw pressure relief valve 2 5 bar for closed loop system to the top pipe of the tank 5 14 Check for leakages on open or closed loop system 5 15 The optional electric heater should be connected by a fully licensed electrician following the national standards for electric installations Connections points on thermostat No1 Line 220 volt No4 Neutral On metal flange EE earth 004 01641 JOOI 10 popoou jou st 67 19quinN 4 e o 2 6 FLAT ROOF ASSEMBLY INSTRUCTIONS FOR SYSTEMS WITH 2 COLLECTORS MODELS 200 2 175 300 2 200 Assembly steps 6 1 Open the pack of the support system Identify the items from table page 5 and the drawing next page 6 2 Assembly the parts between themselves using the set of bolts and nuts included in the pack At this stage do not fasten tight the bolts 6 3 Fix collectors on support as shown on drawing using M6X20 bolts and washers No 21 amp 22 at table Do not fasten tight yet 6 4 Position the tank on supports Two people for 200 Itr and four people for 300 are needed to handle it from each end Fasten well with the 2 bolts M10X30 the tank on the support system The 2 bolts are already mounted on the tank and have to be temporarily removed before placing the tank on the support 6 5 fasten well the collectors on support and then fasten well all the parts of the support syste
12. lination so that the tank would remain as close as possible vertical Make sure to use the 2 angles part 29 for fastening the tank At this stage do not fasten tight the bolts Fix the support system on the roof structure as shown on drawing Make sure that this kind of fixing is suitable to withstand at least 120 Km hr wind speed If in doubt consult your supplier or your engineer for possible alternative way of fixing Fix collectors on support as shown on drawing using the M6X20 bolts and washers Do not fasten tight yet Position the tank on supports Two people for 200 Itr and four people for 300 Itr are needed to handle it from each end Fasten well with the 2 bolts M10X30 the tank on the support system The 2 bolts are already mounted on the tank and have to be temporarily removed before placing the tank on the support Now fasten well the collectors on support and then fasten well all the parts of the support system among themselves Connect the insulated copper or plastic pipe at closed loop system The long pipe is for cold return to bottom of collector The short pipe is for hot supply from top of collector Make sure that you fasten well the compression fittings in order to tight the closed loop Fix and fasten well the 2 compression end caps on the 2 remaining open ends of the collectors Connect the non return pressure safety valve on the cold water inlet of tank making sure that the arrow is pointing towards the tank
13. m among themselves 6 6 Drill the floor with 10mm drill at the 4 fixing points insert the raw plugs provided and fasten well the whole support system to the floor Make sure that the material of floor is suitable concrete for this kind of fixing in order to withstand at least 120 Km hr wind speed If in doubt consult your supplier or your engineer for possible alternative way of fixing 6 7 Connect the insulated copper or plastic pipe at closed loop system The long pipe 15 for cold return to bottom of collector The short pipe is for hot supply from top of collector Make sure that you fasten well the compression fittings in order to tight the closed loop Fix and fasten well the 2 compression end caps on the 2 remaining open ends of the collectors 6 8 Connect the non return pressure safety valve on the cold water inlet of boiler making sure that the arrow is pointing towards the tank upwards 6 9 Connect cold water supply using always a shut off water valve Make sure the pipes are well insulated 6 10 Connect hot water outlet piping to consumption points It is strongly recommended to install a thermostatic mixing valve set at 50 55 C on the hot water piping anywhere before the consumption points Make sure the pipes are well insulated 6 11 Fill the tank with cold water Leave open one tap of hot water so that air will be flushed out and the tank will be completely filled up 6 12 Fill up the closed loop system wi
14. n be optionally accessory equipped with immersion electric heater electric element for use when not enough solar irradiation is available The immersion electric heater is available in 2 KW or 3kW or 4 kW at 230 Volt It is equipped with control thermostat set at 60 C and safety thermostat thermal cut out manually reset Technical Data of tanks as table below Nominal size 120 150 200 300 Capacity Itr 115 143 179 Incl h exchanger Test pressure bar Operating pressure bar Max temperature C Cold amp hot water connectors male 2 4 Support system The support system is made from galvanized pressed steel It is designed for flat roof installation as well as for inclined tiled roof It can be installed at 4 different inclinations 18 25 32 40 so it can meet any roof slope The support system can withstand wind velocity up to 120 km hr and weight of snow up to 80cm height In order to assembly the support system the following tools are needed 1X yo Spanner 10mm Spanner 13mm 1X P gt 2 Spanners 17mm 2X Screwdriver 1X Drill 210 for fastening the system on the roof The material list for each set of support system is 120 1 175 200 1 200 200 1 270 200 2 175 300 2 200 SET OF SUPPORT FRAME PARTS 01 1 profile section 146500 _ 2 2 2 2 2 2 2 2 02 A2 profile in N sec
15. on the hot water piping anywhere before the consumption points Make sure the pipes are well insulated Fill the tank with cold water Leave open one tap of hot water so that air will be flushed out and the tank will be completely filled up Fill up the closed loop system with thermo convention liquid from the top pipe of tank Make sure that no air bubbles are coming out so filling is completed Screw pressure relief valve 2 5 bar for closed loop system to the top pipe of the tank Check for leakages on open or closed loop system The optional electric heater should be connected by a fully licensed electrician following the national standards for electric installations Connections points on thermostat No 1 Line 220 volt No4 D On metal flange earth 12 13 N 1 N 1 Numbers 20 21 25 are not needed for inclined roof installation 8 INCLINED ROOF TILES ASSEMBLY INSTRUCTIONS FOR SYSTEMS WITH 2 COLLECTORS MODELS 200 2 175 300 2 200 Assembly steps 8 1 8 2 8 3 8 4 8 5 8 6 8 8 8 8 9 8 10 8 11 8 12 8 13 8 14 8 15 Open the pack of the support system Identify the items from table page 5 and the drawing next page Assembly the parts among themselves using the set of bolts and nuts included in the pack When assembling the tank supports to the profiles D1 or D2 pay attention to use the proper pair of holes to match the roof inc
16. or leakage in primary circuit Restore the leakage add antifreeze Check also for leakages in domestic hot water piping network Restore if needed When by any reason glass 15 broken replace the soonest possible When electric heater is not functioning check for burned fuse or for safety contact of thermostat activation Press inside the button with the mark to restore and adjust thermostat lower 17 Published July 2008 SOLE S A SOLAR DOMESTIC APPLIANCES MANUFACTURER Lefktron amp Laikon Agonon 136 71 Acharnai Athens Greece Tel 30210 2389500 Fax 30210 2389502 Email marketing sole gr www sole gr www eurostar solar com
17. rt the raw plugs provided and fasten well the whole support system to the floor Make sure that the material of floor is suitable concrete for this kind of fixing in order to withstand at least 120 Km hr wind speed If in doubt consult your supplier or your engineer for possible alternative way of fixing 5 7 Connect the insulated copper or plastic pipe at closed loop system The long pipe is for cold return to bottom of collector The short pipe is for hot supply from top of collector Make sure that you fasten well the compression fittings in order to tight the closed loop Fix and fasten well the 2 compression end caps on the 2 remaining open ends of the collector 5 8 Connect the non return pressure safety valve on the cold water inlet of tank making sure that the arrow is pointing towards the tank upwards 5 9 Connect cold water supply using always a shut off water valve Make sure the pipes well insulated 5 10 Connect hot water outlet piping to consumption points is strongly recommended to install a thermostatic mixing valve set at 50 55 C on the hot water piping anywhere before the consumption points Make sure the pipes are well insulated 5 11 Fill the tank with cold water Leave open one tap of hot water so that air will be flushed out and the tank will be completely filled up 5 12 Fill up the closed loop system with thermo convention liquid from the top pipe of tank Make sure that no air bubb
18. th thermo convention liquid from the top pipe of tank Make sure that no air bubbles are coming out so filling is completed 6 13 Screw pressure relief valve 2 5 bar for closed loop system to the top pipe of the tank 6 14 Check for leakages on open or closed loop system 6 15 optional electric heater should be connected by fully licensed electrician following the national standards for electric installations Connections points on thermostat No 1 Line 220 volt No4 Neutral 1 On metal flange Vv earth 10 Un P 2 4 p C4 B E 7T INCLINED ROOF TILES ASSEMBLY INSTRUCTIONS FOR SYSTEMS WITH 1 COLLECTOR MODELS 120 1 175 120 1 200 150 1 200 150 1 250 200 1 200 200 1 250 200 1 270 Assembly steps 7 1 7 2 7 3 7 4 7 6 7 7 7 8 7 9 7 10 7 11 7 12 7 13 7 14 7 15 Open the pack of the support system Identify the items from table page 5 and the drawing next page Assembly the parts among themselves using the set of bolts and nuts included in the pack When assembling the tank supports to the profiles D1 or D2 pay attention to use the proper pair of holes to match the roof inclination so that the tank would remain as close as possible vertical Make sure to use the 2 angles part 29 for fastening the tank At this stage do not fasten tight the bolts Fix the support system on the roof structure as shown on drawing Mak
19. thus transferring solar energy to the domestic water Primary system contains antifreeze glycol for frost protection of collectors Temperature of hot water depends on solar irradiation of the day season of year ambient temperature cold water inlet temperature time of day using hot water quantity used Best timing for use 12 00 noon 3 00p m and 5 00 p m to 8 00 p m If you need hot water early in the morning avoid excess consumption previous evening For a shower 30 60 Itr hot water is needed For filling bathtub 120 150 Itr hot water is needed If your solar system is equipped with the optional electric heater switch on only when needed and for 1 to 2 hours NEVER leave electric heater permanently ON The thermostat is adjusted to 55 C 60 C 11 MAINTENANCE INSTRUCTIONS For long life of your solar heater follow below given instructions At least once a year check for excessive dust on collectors Wash with cold water at early morning before 10 00 a m Every two years replace magnesium protection anode contact your installer Every 4 years check and paint if necessary with grey color primer the support frame When away from home for long period in summer it would be better to cover the collectors with white cloth or similar to prevent overheating At extremely cold winter nights below 0 C leave a hot water tap inside house slightly open to prevent pipe freezing If solar heater doesn t warm up with sunshine check f
20. tion 1570mm __ 2 04 D1 profile in N section 2192mm 2 2 2 2 2 2 2 2 06 Xt bracketi24 amp 8mm 7 M H 4 4 4 4 4 4 2 07 xasbracket 08 61 2000mm Stainless steel strips 670mm Insulated copper pipe tomm 2 12m 2 30 2 27m 2 37m 2 27 2 37m 2 57m 2 56m 2 49m for close loop cold water Insulated Copper pipe 0 43m 0 42m 0 39m 0 48m 0 39m 0 48 0 52m D 895m 0 60 for close loop hot water OF 12 Compression Elbow Male 1 x 015 13 Compression Elbow 2 2 2 2 2 2 14 CompressionEndCap z2__ 2 2 2 212121212 2 15 Compression Connector 022 x 022 Pressure Safety Valve 10 bar 6 for open loop er ER ER CAERE ER T for closed loop SET OF BOLTS AND NUTS 18 Bolt M10x16 DIN 933 8 8 7 16 12 16 12 16 12 16 12 16 12 16 12 16 12 16 12 16 12 19 Nut M10 DIN 934 8 17 12 17 12 17 12 17 12 17 12 17 12 17 12 17 12 17 12 20 10 20 DIN 93384 1 1 1 V 1 t 1 1 1 21 Washer 010 DIN 12 1 1 1 1 1 t 1 t 1 5 22 M6x20 DIN933 8 8 7 42 4 4 4 4 4 4 8 8 MEME r Se See ae ee ee 24 Anchored Bolt M8x60 DIN 571 25 Plastic Rawlplugs D10 Cross Recess Counter Sunk Head Bolt M8x20 DIN 7969 ____
21. upwards Connect cold water supply using always a shut off water valve Make sure the pipes are well insulated Connect hot water outlet piping to consumption points is strongly recommended to install a thermostatic mixing valve set at 50 55 C on the hot water piping anywhere before the consumption points Make sure the pipes are well insulated Fill the tank with cold water Leave open one tap of hot water so that air will be flushed out and the tank will be completely filled up Fill up the closed loop system with thermo convention liquid from the top pipe of tank Make sure that no air bubbles are coming out so filling is completed ocrew pressure relief valve 2 5 bar for closed loop system to the top pipe of tank Check for leakages on open or closed loop system The optional electric heater should be connected by a fully licensed electrician following the national standards for electric installations Connections points on thermostat No1 Line 220 volt No4 Neutral L On metal flange earth 14 UOTje Tejsur 1001 jou cz TZ OZ 1 1 m ad F 1 iii 4 i 4 4 F X A Uk P 4 15 9 CHECK LIST FOR INSTALLER Before leaving from the installation make sure that T Cold and hot insulated pipes of closed loop system have a continuous ascending slope to the tan
22. wer There is an earth point on the flange of the heater which must be connected to the central earth of the building In any case the support of the solar system must be earthed with copper wire of 16 to the earthing grid of the building This will also serve as lightning protection 3 10 In a solar system equipped with the optional electric heater after completion of electrical and plumbing installation test the operation of the electric heater and thermostat ONLY AFTER FILLING the tank with city water Otherwise the electric heater will be fused out destroyed 3 11 Make sure that before filling the tank with city water the pressure safety non return valve has been installed on the cold water inlet with the arrow pointing to the tank This valve will open and release the pressure when by overheating or other reason it has exceeded 10 bar 3 12 When handling the thermo convention liquid make sure that you wear protective glasses for the eyes and gloves for the skin 3 13 When temporarily leave the collectors on the roof during installation ALWAYS position them with glass facing the sky Otherwise there is danger that water from rain may enter the collector from the back side through the ventilation holes If this happens the insulation will be wet and the glass will have humidity on inside surface Drying will take a very long time 4 RECOMENDATIONS 4 1 The cold water piping should withstand pressure of 10 bar The hot w
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