5443233 GB 3/2020
Dispose after installation.
Installation and service
instructions
for contractors
VIESMANN
EA1 extension
Function extension
Safety instructions
Please follow these safety instructions closely to prevent accidents
and material losses.
Safety instructions explained
Danger
This symbol warns against the
risk of injury.
!
Please note
This symbol warns against the
risk of material losses and envi-
ronmental pollution.
Note
Details identified by the word "Note"
contain additional information.
Installation, commissioning, inspection,
maintenance and repairs must only be
carried out by an authorised, competent
person (heating engineer/installation
contractor).
Before working on the appliance/heat-
ing system, isolate it from the power
supply (e.g. by removing a separate
mains fuse or by means of a mains iso-
lator) and safeguard against unauthor-
ised reconnection.
When using gas as fuel, also close the
main gas shut-off valve and safeguard
against unintentional reopening.
Check for gas tightness after installa-
tion.
Wear suitable personal protective
equipment when carrying out any work.
Repairing components that fulfil a
safety function can compromise the
safe operation of the system.
For replacements, use only original
spare parts supplied or approved by
Viessmann.
Install the components with new gas-
kets.
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