Checking The Diaphragm Expansion Vessel And System Pressure; Checking All Gas Equipment For Tightness At Operating Pressure; Flue Gas Emissions Test - Viessmann VITODENS 200-W Service Instructions Manual

Further details regarding the individual steps
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.

Flue gas emissions test

The electronic combustion control unit automatically ensures an optimum com-
bustion quality. Only the combustion values need to be checked during commis-
sioning and maintenance. For this, check the CO
description of the electronic combustion control unit, see page 105.
CO or O content
2 2
The CO content must be within the following ranges (upper and lower output):
2
7.7 to 9.2% for natural gas E and LL
9.3 to 10.9% for LPG P
For all gas types, the O
If the actual CO or O
2 2
balanced flue system for tightness.
Commissioning, inspection, maintenance
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: 3 bar
content must be between 4.4% and 6.9%.
2
values lie outside their respective ranges, check the
(cont.)
or O content. For a function
2 2
23