Electrical Connections; Opening The Wiring Chamber - Viessmann Vitodens 050-W Installation And Service Instructions Manual

Gas connection
(cont.)
2. Check for leaks.
Danger
Escaping gas leads to a risk of explosion.
Check all connections on the gas side (also
inside the appliance) for tightness.
Note
Only use suitable and approved leak detection
agents (EN 14291) and devices for the leak test.
Leak detection agents with unsuitable constituents
(e.g. nitrides, sulphides) can cause material dam-
age.
Remove residues of the leak detection agent after
testing.
!
Please note
Excessive test pressure will damage the
boiler and gas solenoid valve.
Max. test pressure 150 mbar (15 kPa). If a
higher pressure is required for leak detec-
tion, disconnect the boiler and the gas sole-
noid valve from the main supply pipe (undo
the fitting).

Electrical connections

Opening the wiring chamber

4x
2.
3.
1.
Fig. 15
3. Purge the gas line.
Note
Operation with LPG:
Install an external safety solenoid valve if the boiler is
installed below ground level. An EM-EA1 extension
(accessories) is required to connect the safety sole-
noid valve.
!
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.
Installation sequence
23