background image

 

 

8 Function of the check valves [Expert] 

 

24 

997655910x-mub-en 

 V07 

2016/05 

8

 

Function of the check valves [Expert] 

Within their application range, the check valves of this station prevent unwanted gravity 
circulation. The functioning of the check valves depends on: 

 

the installation height 

 

the temperature difference between the storage tank and the collector 

 

the heat transfer fluid used 

In the diagram below, you can see if the check valves integrated in the station are sufficient.  
If the check valves are not sufficient, additional components must be installed to prevent gravity 
circulation. Components such as siphons ("heat traps"), 2-way valves (zone valves) or additional 
check valves can be installed for this purpose. 

Example: 

 

The station is equipped with two check valves per storage tank circuit  
(2 x 200 mm wc = 400 mm wc). 

 

You use a mixture of water and 40 % of propylene glycol as solar fluid. 

 

The installation height between the collector and the storage tank is 10 m. 

Instal

latio

n hei

gh

t i

m

 

 

 

 

Temperature difference storage tank/collector in K 

 

 

Result: 

The check valves prevent gravity circulation up to a temperature difference of about 62 K. If the 
temperature difference between the collector and the tank is larger, the difference in density of 
the solar fluid will be so large that the check valves are pushed open. 

Circulation 

Solar fluid 

Summary of Contents for SolarBloC midi 2D

Page 1: ...KG Böcklerstr 11 D 31789 Hameln Germany Phone 49 5151 9856 0 Fax 49 5151 9856 98 E mail info paw eu Web www paw eu 2016 05 997655910x mub en V07 1 Installation and Commissioning Instructions SolarBloC midi 2D DN 20 ...

Page 2: ...tem no 997655910x mub en Version V07 Issued 2016 05 Translation of the original instructions We reserve the right to make technical changes without notice Printed in Germany Copyright by PAW GmbH Co KG PAW GmbH Co KG Böcklerstraße 11 D 31789 Hameln Germany ...

Page 3: ...allation specialist 8 4 Commissioning specialist 11 4 1 Flushing and filling the solar circuit 12 4 2 Preparations before flushing 14 4 3 Flushing and filling 15 4 4 Adjustment of the solar installation 18 5 Maintenance specialist 19 5 1 Draining the solar installation 19 5 2 Deinstallation 19 6 Spare parts specialist 20 7 Technical data 22 8 Function of the check valves Expert 24 9 Commissioning ...

Page 4: ...expansion tanks and controllers please observe the instructions of the corresponding manufacturer 1 2 About this product The station is a premounted group of fittings checked for tightness and used to circulate the solar fluid in the solar circuit It is mounted on wall brackets and fixed with clips The station contains important components and safety devices for the operation of the installation T...

Page 5: ...ed in these instructions Due to its design the station must be mounted and operated as described in these instructions Improper usage excludes any liability claims Only use PAW accessories with the solar station Under the influence of solar radiation the collectors can get very hot The solar fluid in the solar circuit can heat up to more than 100 C Only flush and fill the solar circuit if the coll...

Page 6: ...egulations of the professional association instructions and safety instructions of this manual WARNING Danger of scalding due to vapour escape With pressure relief valves there is risk of scalding due to vapour escape During installation check if the local conditions require the connection of a discharge line to the safety group For this purpose please observe the instructions regarding the pressu...

Page 7: ...ose the ball valves for service and maintenance NOTICE Material damage due to mineral oils Mineral oil products cause lasting damage to seals made of EPDM whereby the sealant properties get lost We do not assume liability nor provide warranty for damage to property resulting from sealants damaged in this way It is imperative to avoid that EPDM gets in contact with substances containing mineral oil...

Page 8: ...elivery Accessories cutting ring compression fitting 1 Push the union nut and the cutting ring onto the copper pipe The pipe must protrude at least 3 mm from the cutting ring in order to ensure the force transmission and the sealing 2 Insert the support sleeve into the copper pipe 3 Insert the copper pipe with the plugged on individual parts and as far as possible into the housing of the cutting r...

Page 9: ...ure 4 Copy the mounting holes of the solar station besides the thermometers to the mounting surface 5 Drill the holes and mount the solar station to the wall with appropriate wall plugs and screws 6 Connect the solar station to the installation by using the pipes Common flow of both collector fields Return to the collector field 1 Return to the collector field 2 Return from the storage tank Flow t...

Page 10: ...arding the expansion tank 9 Check all thread connections and tighten them if necessary WARNING Risk to life and limb due to electric shock Prior to commencing electrical work on the controller pull the mains plug Only after completing all installation work as well as the flushing and filling the mains plug of the controller can be plugged into a socket An unintentional start of the motors is thus ...

Page 11: ... happens that the solar system can not be completely drained after flushing There is thus a risk of late frost damage when flushing with water Flush and fill the solar installation therefore only with the solar fluid used later Use a water and propylene glycol mixture with maximum 50 of propylene glycol as solar fluid NOTICE Note regarding the commissioning sequence During commissioning fill the h...

Page 12: ...lation are integrated in the solar station To flush dirt particles out of the installation only use flush and fill stations with fine filters Ball valve with integrated check valve Normal flow direction in the figure downwards 0 45 90 Check valve is operating flow only in flow direction Check valve is not operating flow in both directions Ball valve closed no flow 14 ...

Page 13: ... the upper part of the Airstop and can be released via the vent plug 4 2 WARNING Danger of scalding due to vapour escape The escaping fluid can reach temperatures of more than 100 C and cause scalding Carefully open the vent plug and close it again as soon as fluid escapes Venting the solar installation after commissioning At the beginning vent the solar system daily and then weekly or monthly dep...

Page 14: ...n tank from the solar installation Please observe the separate instructions regarding the expansion tank 2 Close the return ball valves 1 2ᅵ7 2 90 see page 12 3 The ball valve in the flow line 5 2 and the ball valves in the flow meters 3 1ᅵ9 1 must be open 4 Connect the fill station to the solar station Pressure hose to the fill valve 7 4 Flush hose to the drain valve 9 2 ...

Page 15: ... 7 2 to vent the pump section see page 12 4 Switch off the pump of the flush and fill station and close the fill and drain valves 7 4 9 2 5 Connect the pressure hose of the fill valve 7 4 to the fill valve 1 3 of the second collector circuit 6 Open the fill and drain valves 1 3 9 2 7 Put the flush and fill station into operation and flush the installation until clear solar fluid exits Vent the sol...

Page 16: ...system pressure decreases and eliminate leaks if necessary 11 Reduce the pressure at the drain valve 9 2 to the operating pressure of the installation 12 Connect the expansion tank to the solar circuit and set the operating pressure of the solar system by means of the flush and fill station for the required operating pressure see the instructions of the expansion tank 13 Close the fill and drain v...

Page 17: ...according to the controller instructions Let the pump of the solar circuit run at maximum revolution speed for at least 15 minutes 16 Vent the solar installation several times at the vent plug of the Airstop until the solar fluid exits without bubbles see page 13 If necessary increase the system pressure to the operating pressure 17 Remove the hoses of the flush and fill station and screw the seal...

Page 18: ...y if the pump is not speed controlled Please observe the specifications of the collector manufacturer for the correct adjustment of the flow rate 2 Mount the insulating front shells of the solar station 3 Set the controller to automatic mode see controller instructions The commissioning of the solar installation is now completed Please fill in completely the commissioning report on page 26 Scale 3...

Page 19: ... escaping solar fluid may be very hot Place and secure the heat resistant collecting container in such a way that people standing nearby are not endangered during the draining of the solar installation 4 Open the lowest drain valve of the solar installation 5 To accelerate the draining of the solar circuit the vent valve possibly present at the highest point of the solar installation can be opened...

Page 20: ...list NOTICE Complaints and requests orders of spare parts will only be processed with information on the serial number The serial number is placed on the safety group of the solar station In case of a complaint please send us the entirely completed commissioning report on page 26 ...

Page 21: ...nos PARA ST 15 7 0 E123207MO Wilo Yonos PARA ST 15 13 E12320135 Grundfos UPM3 Solar 15 75 E121617 Grundfos UPM3 Solar 15 145 E121620 Connection of the PWM pumps Wilo Yonos PARA ST 15 7 0 Wilo Yonos PARA ST 15 13 Grundfos UPM3 Solar 15 75 Grundfos UPM3 Solar 15 145 PWM brown GND blue ...

Page 22: ...ad flat sealing Outlet pressure relief valve internal thread Operating data Max admissible pressure PN 10 Maximum operating temperature 120 C Max short time temperature 160 C 15 minutes Max propylene glycol content 50 Equipment Pressure relief valve 6 bars Pressure gauge 0 6 bars Check valves 3 x 200 mm wc can be opened Flow meter 3 22 l min Materials Valves and fittings Brass Gaskets EPDM Check v...

Page 23: ...7 Technical data 2016 05 997655910x mub en V07 23 ...

Page 24: ...t gravity circulation Components such as siphons heat traps 2 way valves zone valves or additional check valves can be installed for this purpose Example The station is equipped with two check valves per storage tank circuit 2 x 200 mm wc 400 mm wc You use a mixture of water and 40 of propylene glycol as solar fluid The installation height between the collector and the storage tank is 10 m Install...

Page 25: ...rculation can lead to a cooling down of the storage tank Calculation example Δp Δρ g h Collector temperature 5 C Density solar fluid ρ1 1042 kg m Storage tank temperature 67 C Density of the solar fluid ρ2 1002 5 kg m Δρ ρ1 ρ2 39 5 kg m g 9 81 m s Installation height h 10 m Δp 3875 Pa 395 mm wc The two check valves per storage tank circuit in the station 2 x 200 mm wc are sufficient for an install...

Page 26: ...tor field Piping mm l m Venting collector field Manual vent valve Automatic vent valve No Vented Airstop station Vented Solar fluid type glycol Antifreeze tested up to C Serial numbers Flow rate l m Station Pumps type Controller Pump speed level I II III System pressure mbar Software version Expansion tank type Initial pressure mbar Restrictor position Pressure relief valve Checked Check valves Ch...

Page 27: ...9 Commissioning report 2016 05 997655910x mub en V07 27 ...

Page 28: ...997655910x mub en V07 2016 05 PAW GmbH Co KG Böcklerstraße 11 D 31789 Hameln Germany www paw eu Phone 49 0 5151 9856 0 Telefax 49 0 5151 9856 98 ...

Reviews: