Checking The Condensate Drain And Cleaning The Siphon; Checking The Diaphragm Expansion Vessel And System Pressure; Checking All Gas Equipment For Tightness At Operating Pressure - Viessmann VITODENS 200-W WB2B Service Instructions For Contractors

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".
Checking all gas equipment for tightness at operating pres-
sure
Danger
Escaping gas leads to a risk of
explosion.
Check gas equipment for tight-
ness.
22
(cont.)
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 freely drain off.
4. Fill siphon C with water and reas-
semble.
5. Push on cap A from below.
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: 4 bar