Viessmann Vitocal 252-A Series - Page 166

166
Measure Completed Comments
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General working environment
■
Inform the following persons of the type of work to be carried
out:
–
All maintenance personnel
–
All persons in the vicinity of the system.
■
Shut off the area surrounding the outdoor unit.
■
Survey the immediate surroundings of the outdoor unit for flam-
mable materials and ignition sources:
Remove all flammable, movable materials and all ignition sour-
ces.
?
Checking for the presence of refrigerant
■
In order to recognise a flammable atmosphere in time:
Before, during and after the work, check the surrounding area
for any escaping refrigerant, using an explosion-proof refrigerant
detector suitable for R290.
This refrigerant detector must not generate any sparks and must
be suitably sealed.
§
Fire extinguisher
A CO
2
or powder extinguisher must be to hand in the following ca-
ses:
■
Refrigerant is being drained.
■
Refrigerant is being topped up.
■
Welding or brazing/soldering work is being carried out.
$
Sources of ignition
■
When carrying out work on a refrigerant circuit that contains or
previously contained flammable refrigerant, never use ignition
sources that could ignite the refrigerant.
Remove all possible ignition sources, including cigarettes, from
the area where installation, repair, dismantling or disposal work
is taking place that may result in refrigerant escaping.
■
Before starting work, survey the immediate surroundings of the
appliance for flammable materials and ignition sources:
Remove all flammable, movable materials and all ignition sour-
ces.
■
Display no smoking signs.
%
Ventilating the work location
■
Carry out repairs outdoors, or provide adequate ventilation for
the work location before interfering with the refrigerant circuit or
commencing any welding or brazing/soldering work.
■
The ventilation must be maintained for the entire duration of the
work. The ventilation should dilute any refrigerant that may es-
cape and should ideally discharge it into the surrounding atmos-
phere.
Outdoor unit maintenance
Checklist for maintenance work (cont.)
6222080
Maintenance