Checking The Condensate Drain And Cleaning The Siphon; Checking The Neutralising System (If Installed) 21. Checking The Diaphragm Expansion Vessel And System Pressure; Checking Electrical Connections For Tightness 24. Checking Gas Equipment For Tightness At Operating Pressure - Viessmann VITODENS 200-W Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps

Checking the condensate drain and cleaning the siphon

B C A
Checking the diaphragm expansion vessel and system pressure
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".
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.
Checking gas equipment for tightness at operating pressure
Danger
Escaping gas leads to a risk of
explosion.
Checking gas equipment for
tightness.
24
1. Remove retaining clip A and pull out
insert B.
2. Clean siphon C and check that the
condensate can freely drain off.
3. Fill siphon C with water and reas-
semble.
Note
Never twist the supply hose during
assembly.
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 pre-charge pres-
sure of the diaphragm expansion
vessel.
Permiss. operating pressure: 4 bar
(cont.)