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

Wall mounted gas condensing boiler natural gas and lpg version
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Commissioning, inspection, maintenance
Further details regarding the individual steps
2. If required, spray slightly acidic,
chloride-free cleaning agents based
on phosphoric acid (e.g. Antox 75 E)
onto heat exchanger A and let the
solution soak in for approx. 20 min.
3. Thoroughly flush heat exchanger A
with water.
4. Install the burner and torque screws
diagonally with 12 Nm.
5. Fit the gas supply pipe with a new
gasket. Torque fittings with 15 Nm.

Checking the condensate drain and cleaning the siphon

A
B C

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".
24
(cont.)
6. Check the gas connections for tight-
ness.
Danger
Escaping gas leads to a risk of
explosion.
Check all fittings for gas tight-
ness.
7. Connect the electrical cables/leads to
each corresponding component.
1. Remove retaining clip A and pull out
insert B.
2. Clean siphon C and check that the
condensate can drain off freely.
3. Fill siphon C with water and reas-
semble.
Note
Never twist the supply hose during
assembly.
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.

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