Installation; Preparations; Pipework Installation; Air Vent Valve - Stiebel Eltron SOL 27 BASIC Utilisation Et Installation

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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 link up more than five col-
lectors in series. Where several rows of collectors are
fitted, they must be connected in parallel
Note
The type-testing is limited to single hydraulic assemblies
of no more than 30 individual collectors. 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 with frost and
corrosion protection, use only the heat transfer medium
which is mentioned in the table "Specification".
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.
Ventilation tiles are recommended as roof outlets for tiled or sla-
te-covered roofs with more severe inclination.
For flat roofs and corrugated roofs with lesser pitches, routing the
pipes through an external wall is recommended.
Avoid sawing off pipes to prevent swarf entering the system. Use
a pipe cutter for swarf-free cutting.
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
Apply the thermal insulation only following a successful
leak test.
9.3

Air vent valve

Install a lockable manual air vent valve at a high point of the
system or route a ventilation line to a manual air vent valve. Auto-
matic quick-acting air vent valves installed close to the collector
must be able to be isolated 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 fittings between the col-
lectors and the safety valve.
The safety valve must discharge into a container that can hold the
entire content of the system. In case of smaller systems, 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.

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