19Installation instructions geoTHERM VWS 0020046310_014.12 On-site installationa Caution!Flush the heating system thoroughly be-fore connecting the appliance!By doing that, residue such as welds,cinder, hemp, putty, rust, rough dust andsimilar substances are removed from thepipes. Otherwise such substances can bedeposited in the appliance and cause da-mage.a Caution!To prevent leaks, take care that no me-chanical stresses are created on theconnection lines!- The pipework installation must be carried out in ac-cordance with the dimensional and connection dra-wings in Fig. 4.1.- The installation must be performed by a specialist fit-ter.- The applicable regulations must be observed duringthe installation.h Note!Air in the heating system leads to im-paired operation and reduces the heatingoutput. Fit bleed valves as required.3456721Fig. 4.12 Fitting the connection elbowsKey to Fig. 4.121 Heating feed2 Heating return3 Return to domestic hot water cylinder4 Heat source to the heat pump5 Heat source from the heat pump6 Insulating pad7 Blanking plugsa Caution!To avoid leaks, take care that the cor-rect seals are used on the connecting el-bows!Leaks can result if the seals with themetal support ring are not used in theheat source circuit!• Remove the blanking plugs from the appliance con-nections (7). They are no longer needed and can bedisposed of.• Fit the three connecting elbows (1 to 3) with the yel-low/green gaskets supplied with the accessories.• Fit the two connecting elbows (4 and 5) with the sealswith the metal support ring supplied with the accesso-ries.• The accessory kit contains an insulating pad for insu-lating the connection plate. Fit this insulating pad tothe two right hand screwed connections (6).Assembly and installation 4