Checking The Condensate Drain And Cleaning The Siphon; Checking The Neutralising System (If Installed); Checking The Diaphragm Expansion Vessel And System Pressure; Checking The Function Of The Safety Valves - Viessmann VITODENS 200-W Installation And Service Instructions Manual

Installing the burner
4. Connect the electrical cables/leads to the corre-
sponding components.

Checking the condensate drain and cleaning the siphon

Note
If condensate escapes at vent aperture
clean or (if necessary) replace the following drain line.
D
E
F
C
B
Fig.33
On multi boiler systems:
Clean the siphon in the flue gas header as well.

Checking the neutralising system (if installed)

Checking the diaphragm expansion vessel and system pressure

Note
Carry out this test on a cold system.
1. Drain the system until the pressure gauge indicates
"0" or close the cap valve on the expansion vessel
and reduce the pressure at the cap valve.
2. If the pre-charge pressure of the expansion vessel
is lower than the static system pressure, top up with
nitrogen until the pre-charge pressure is 0.1 to 0.2
bar higher.

Checking the function of the safety valves

(cont.)
or ,
A B
1. Pull off cap
2. Undo hose
3. Undo union nut
4. Clean siphon
5. Check that the condensate can drain freely to the
A
6. Fill siphon
7. Refit hose
8. Push on cap
3. Top up with water until the charge pressure of the
Commissioning, inspection, maintenance
downwards.
C
.
D
and pull siphon downwards.
E
.
F
public sewage system.
with water and reassemble.
F
D .
from below.
C
cooled system is 0.1 to 0.2 bar higher than the pre-
charge pressure of the expansion vessel.
Permiss. operating pressure: 6 bar.
39