Gas Connection; Opening The Control Unit Enclosure - Viessmann VITODENS 200-W Installation And Service Instructions Manual

Installation sequence

Gas connection

A
Fig. 8
1. If the gas connection has not been fitted previ-
ously, seal gas shut-off valve
nection.
Information on operation with LPG
Install an external safety solenoid valve if the boiler
is installed below ground level.
2. Danger
Escaping gas leads to a risk of explosion.
Check all gas connections for tightness.
Note
Only use suitable and approved leak detection
agents (EN 14291) and devices for the tightness
test. Leak detection agents with unsuitable constit-
uents (e.g. nitrides, sulphides) can cause material
damage.
Remove residues of the leak detection agent after
testing.
!
Please note
Excessive test pressure will damage the
boiler and the gas train.
Max. test pressure 150 mbar (15 kPa).
Where higher pressure is required for tight-
ness tests, disconnect the boiler and the gas
train from the main supply pipe (undo the fit-
ting).

Opening the control unit enclosure

!
Please note
Electronic assemblies can be damaged by elec-
trostatic discharge.
Prior to commencing any work, touch earthed
objects, such as heating or water pipes to dis-
charge static loads.
16
3. Purge the gas line.
A to the gas con-
Conversion to alternative gas types:
See "Commissioning, inspection and mainte-
nance".