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9. Installation
Only qualified contractors should carry out installation, commis-
sioning, maintenance and repair.
Observe the accident prevention instructions.
Note
For hydraulic reasons, never connect more than five col-
lectors in series. Where several rows of collectors are
fitted, they must be connected in parallel.
Note
The type-test approbation is invalidated if more than 30
collectors are grouped together to form a single hydraulic
assembly. An individual inspection is required for larger
systems.
Note
Commercial systems, the open content of which exceeds
10 litres and is not more than 50 litres, require notifica-
tion to the relevant local authority [in Germany - check
local regulations].
Damage to the appliance and environment
When filling the solar thermal system, for frost and corro-
sion protection use only the heat transfer medium men-
tioned in the chapter "Specification/Data table".
9.1 Preparations
Provide all pipe runs to the building interior on site.
9.2 Pipework
installation
Use copper, stainless steel or corrugated stainless steel hoses
when installing the flow and return lines. With a system com-
prising up to four collectors, we recommend a pipe diameter of
Ø 18 x 1.0.
Avoid sawing off pipes to prevent swarf entering the system. Use
a pipe cutter for swarf-free cutting.
Earth the pipework in accordance with current regulations.
9.2.1 Soldered
lines
Soldered lines must be brazed. Use solder to DIN EN 1044: CP105
and CP203. Use this solder without flux. Only solder gunmetal
and brass fittings with flux F-SH-1 to EN 1045. Other flux has a
detrimental effect on corrosion resistance.
9.2.2 Alternative
lines
Seal lines made with locking ring fittings, press fittings and cor-
rugated hoses by suitable means. Seals must be resistant to glycol
and temperatures up to 180 °C.
Damage to the appliance and environment
The thermal insulation may only be applied following a
successful tightness test.
9.3
Air vent valve
Install a lockable manual air vent valve at high points of the system
or route a ventilation line to a manual air vent valve. Automatic
quick-acting air vent valves installed close to the collector must
be separated from the system with a shut-off valve.
9.4 Safety
valve
Damage to the appliance and environment
There must not be any shut-off appliances between the
collectors and the safety valve.
The safety valve drain must discharge into a container that can
hold the entire content of the system. In the case of smaller sys-
tems, the empty heat transfer medium can is adequate.
9.5 Drain
facility
f
Install a drain valve at the lowest point of the solar thermal
system.
