Checking The Condensate Drain And Cleaning The Siphon; Checking The Diaphragm Expansion Vessel And System Pressure - Viessmann Vitodens 200 Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps

Checking the condensate drain and cleaning the siphon

Checking the diaphragm expansion vessel and system pres-
sure
Note
Carry out 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".
20
(cont.)
1. Check that the condensate can
drain freely at the siphon.
2. Remove the retaining clip and the
siphon.
3. Clean the siphon.
4. Fill the siphon with water, fit it to the
boiler and secure with the retaining
clip.
2. If the inlet pressure of the dia-
phragm expansion vessel is lower
than the static system pressure,
top up with nitrogen until the inlet
pressure is raised by 0.1 to 0.2 bar.
3. Top up your heating system with
water and vent until the filling pres-
sure of a cooled system is 0.1 to
0.2 bar higher than the inlet pres-
sure of the diaphragm expansion
vessel.
Permiss. operating pressure: 3 bar