Checking The Condensate Drain And Cleaning The Siphon; Checking The Neutralising System (If Installed) 23. Checking The Diaphragm Expansion Vessel And System Pressure - Viessmann VITODENS 200-W Service Instructions Manual

Further details regarding the individual steps
6. Check the gas connections for tight-
ness.
Danger
Escaping gas leads to a risk of
explosion.
Check all fittings for gas tight-
ness.

Checking the condensate drain and cleaning the siphon

B
C
A
Checking the diaphragm expansion vessel and system pressure
Note
Perform this test on a cold system.
1. Drain the system or close the cap
valve on the diaphragm expansion
vessel and reduce the pressure until
the pressure gauge indicates "0".
Commissioning, inspection, maintenance
(cont.)
7. Connect the electrical cables/leads to
the corresponding components.
1. Pull off cap A downwards.
2. Undo union nut B and pull off siphon
C downwards.
3. Clean siphon C and check that the
condensate can drain off freely.
4. Fill siphon C with water and reas-
semble.
Note
Never twist the supply hose during
assembly. Route the drain hose with-
out any bends and with a constant
fall.
5. Push on cap A from below.
2. If the pre-charge pressure of the dia-
phragm expansion vessel is lower
than the static system pressure, top
up with nitrogen until the pre-charge
pressure is raised by 0.1 to 0.2 bar.
23