Pressure Test; Tightness Test; Completing The Filling Procedure; Thermal Insulation - Stiebel Eltron SOL 23 Premium Utilisation Et Installation

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f On the lower BDF valve, attach a drain hose which you allow
to discharge into the heat transfer medium container.
f Close the adjusting valve in the solar station by turning the
slot on the flow rate adjusting screw (above the volume flow
display) to the horizontal position.
f Disable the gravity brake by turning the ball valve to a 45°
position.
f Switch the fill pump ON.
Continue the filling process until no more bubbles are expelled
from the drain hose.
f Close the drain valve and fill up to a pressure of approxi-
mately 0.35 MPa (3.5 bar).
f Open the air vent valves at the highest point of the system
and close them again as soon as heat transfer medium is
expelled.

10.12 Pressure test

f Close the shut-off valves in front of the air vent valves to
eliminate a loss of pressure here.
f Using a hydraulic lifting pump, for example, generate a pres-
sure of 0.78 MPa (7.8 bar) in the system.
f Close the BDF valve on the filling side.
f Close the cap valve in order to be able to measure the loss in
pressure.
The pressure must not have dropped after 15 minutes.
The system must be drained again to fit the safety valve.
f Open the air vent valve at the highest point of the system.
f Open the adjusting valve in the solar station by turning the
slot on the flow rate adjusting screw (above the volume flow
display) to the vertical position.
f To drain the system, open the BDF valves on the filling side
and on the draining side.
f Allow the system to fully drain.
f Open the cap valve.
Damage to the appliance and environment
Following a pressure test, fit the safety valve.
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10.13 Tightness test

Damage to the appliance and environment
The thermal insulation may only be applied following a
successful tightness test.
f Refill the system.
f Using the fill pump, generate a pressure of 0.5 MPa (5 bar).
f The test pressure must not drop for a period of two hours.
f Pressure fluctuations are possible due to changing insolation
even when the collectors are covered.
f Carry out a visual inspection of all joints on the solar thermal
system.
10.14 Completing the filling procedure
f Reduce the system pressure to the required filling pressure.
The minimum filling pressure of a cold system is 0.35 MPa
(3.5 bar).
f Close the drain & fill valves with the caps supplied.
f Attach the heat transfer medium safety datasheet to the
system.
f Allow the solar thermal system to rest overnight.
f Before the onset of strong sunlight, vent the system once
more the following morning using the air vent valves.
f Enable the gravity brake by turning the ball valve to a vertical
position.
Note
During normal operation, the shut-off valves in front of
the air vent valves in close proximity to the collector must
always be kept closed.
Damage to the appliance and environment
The safety valve drain must discharge into a container
that can hold the entire content of the system. In the case
of smaller systems, the empty heat transfer medium can
is adequate. Dispose of used heat transfer medium by
appropriate means (landfill or incineration).

10.15 Thermal insulation

Ensure that the system undergoes a pressure test and a tightness
test before applying thermal insulation.
Insulate all pipes. The insulation material is to be provided on site.
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to 22 20
22 - 35 30
35 - 100 same as internal pipe diameter
For insulation material with a different thermal resistance, re-
calculate the thickness of the insulating layer.
Use temperature and UV-resistant insulating material to provide
thermal insulation for the external pipes: Mineral wool which is
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