Performing Final Checks; Checking The Water Quality; Checking The Safety Valve Function; Expansion Vessel - Viessmann Vitocrossal 200 Service Instructions For Contractors

Commissioning, inspection, maintenance
Checking the gaskets on the flue gas side
2. Check lip seal
B of the boiler flue connection for
tightness.
Note
In full load operation, the gaskets can be checked
with an inspection mirror. If required, remove the
thermal insulation components. Traces of conden-
sate on the outside of flue gas collector
indicate a leak.

Performing final checks

1. Carry out final checks in accordance with the
points on pages 16 to 19.

Checking the water quality

Enter the amount of top-up water, the water hardness and the pH value in the tables on page 56.
For water quality requirements, see page 54.

Checking the safety valve function

Expansion vessel

Note
Observe the manufacturer's instructions for the expan-
sion vessel.
Carry out this test on a cold system.
1. Drain the system until the pressure gauge indi-
cates "0" or close the cap valve on the expansion
vessel and reduce the pressure in the expansion
vessel.
2. If the expansion vessel pre-charge pressure is
lower than the static system pressure, top up with
nitrogen. Top up with nitrogen until the pre-charge
pressure is 0.1 to 0.2 bar (10 to 20 kPa) higher.

Checking the mixer for ease of operation and leaks

1. Remove the motorised lever from the mixer han-
dle.
2. Check the mixer for ease of operation.

Checking the thermal insulation for firm seating

28
3. If required, retighten the flue gas collector at ten-
sioning toggles
10 Nm. Replace lip seal
also
C
2. Record the actual values in the report (on
page 56).
3. Top up with water. The charge pressure of the
cooled system must be 0.1 to 0.2 bar (10 to
20 kPa) higher than the pre-charge pressure of the
expansion vessel.
Permiss. operating pressure: 6 bar/0.6 MPa
3. Check the mixer for leaks. Replace the O-rings if
the mixer leaks.
4. Click the motorised lever into place.
(cont.)
D ; tighten screws diagonally with
if it leaks.
B