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Solar-Divicon DN20B Installation, Start-up, Service
4.2
4.2
Preparation for flushing [specialist]
The solar circuit is flushed in the direction of flow.
1.
Disconnect the expansion tank from the solar
thermal system! Please observe the manufacturer's
instructions.
2.
Open the check valves in the supply and return by
turning the ball valves (1.2 and 5.2) to position 45°
(see page 11).
3.
Close the ball valve (3.1) in the flowmeter.
4.
Connect the flush and fill station to the solar station:
- Pressure hose to the fill connection (1.4)
- Flushing hose to the drain connection (3.2).
4.3
Flushing and filling [specialist]
1. Open the fill and drain valves (1.4 and 3.2).
2. Put the flush and fill station into operation and keep
flushing until clear medium escapes.
3. Vent the solar thermal system several times at the
vent plug of the airstop (4.2) during flushing until the
solar fluid escapes without forming bubbles
(see page 12).
The Viessmann compact mobile charging cart is
available for fast and thorough flushing, filling
and purging of the solar circuit
13
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