Viessmann VITOLIGNO 300-C Installation And Service Instructions Manual page 138

Maintenance
Extension kit for heating circuit with mixer
Changing the rotational direction of the mixer
motor (if required)
Danger
An electric shock can be life threatening.
Before opening the boiler, disconnect it from the
mains voltage, e.g. at the fuse or mains isolator.
gS
|
BU
~
Fig. 85
Specification extension kit
Mixer motor installation instructions
Replacing the ignition element
Danger
When replacing the ignition element, there is a
risk of fire and burns due to hot components and
ash.
Only carry out work when the boiler is cold.
■
■ Only open the boiler after it has cooled down.
■ Wear personal protective equipment.
Danger
Breathing in ash or pellet dust is detrimental to
health.
Wear a dust mask to protect your respiratory
tract.
!
Please note
Contact wires on the ignition element can be
damaged if bent.
When connecting the ignition element and the
plug:
■ Use the contact openings provided.
■ Insert carefully.
■ Insert as far as possible.
138
(cont.)
1. Remove the top casing cover of the extension kit.
2. At plug , swap the cores at terminals " " and " ".
gS
3. Refit the casing cover.
!
Please note
The ignition element is damaged by overheat-
ing.
Always ensure that the combustion chamber
door and the covers on the boiler body are
closed during start-up and heating operation. If
the combustion chamber door or any covers are
open, the ignition element does not receive the
required air supply.
Fig. 86