Checking The Neutralising System (If Installed) 29. Checking The Expansion Vessel And Process Circuit Pressure; Checking The Firm Seating Of Electrical Connections 31. Checking All Gas Equipment For Tightness At Operating Pressure; Checking The Combustion Quality - Viessmann Vitosorp 200-F Installation Instructions For Contractors

Checking the neutralising system (if installed)
Checking the expansion vessel and process circuit pressure
Note
Carry out this test on a cold system.
B
A
Fig. 44
Checking the firm seating of electrical connections
Checking all gas equipment for tightness at operating pressure
Danger
Escaping gas leads to a risk of explosion.
Check all gas equipment for tightness.

Checking the combustion quality

The electronic combustion controller automatically
ensures optimum combustion quality. During commis-
sioning/maintenance, only the combustion values need
to be checked. For this, measure the CO content and
the CO or O content. For a description of the elec-
2 2
tronic combustion controller functions, see page 149.
Note
To prevent operating faults and damage, operate the
appliance with uncontaminated combustion air.
CO content
The CO content must be < 1000 ppm for all gas
■
types.
1. Remove cap
2. Top up with nitrogen at connection
3. Fill the process circuit with suitable water and
C
Note
Only use suitable and approved leak detection agents
(EN 14291) and devices for the tightness test. Leak
detection agents with unsuitable constituents (e.g.
nitrides, sulphides) can cause material damage.
Remove leak detection agent residues after testing.
CO
■
■
Commissioning, inspection, maintenance
from the expansion vessel.
B
Drain the process circuit until pressure gauge
indicates "0".
charge pressure is 1.7 ± 0.25
purge; see page 41.
Operating pressure: 2.8 to 3.0 bar (0.28 to
0.3 MPa).
Note
Observe the safety valve tolerance of
■
Take into account the increased volume and
■
pressure caused by heating of the fill water dur-
ing operation.
or O content
2 2
The CO content must be within the following limits
2
for the lower and upper heating output respectively:
– 7.5 to 9.5 % for natural gas E and LL
– 8.8 to 11.1 % for LPG P
The O content must be between 4.0 and 7.6 % for
2
all gas types.
C
until the pre-
A
bar (170 ± 25 kPa).
10 %.
±
57