Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 137

Checklist for maintenance work
Every person working on the refrigerant circuit must
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be able to produce a certificate of competence
issued by an organisation with industry accreditation.
This certificate confirms their competence in the safe
handling of refrigerants by means of a standard
industry procedure.
Servicing work may only carried out in accordance
■
with the manufacturer's specifications. If mainte-
nance and repair work requires assistance from
additional individuals, the person trained in the han-
dling of flammable refrigerants must constantly
supervise the work.
In order to minimise the risk of ignition, safety checks
■
must be carried out before any work on appliances
with flammable refrigerants can commence. Take the
following measures before interfering with the refrig-
erant circuit:
Measure
General working environment
!
Inform the following persons of the type of work to be carried
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out:
–
All maintenance personnel
– All persons in the vicinity of the system.
Shut off the area surrounding the outdoor unit.
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Survey the immediate surroundings of the outdoor unit for flam-
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mable materials and ignition sources:
Remove all flammable materials and ignition sources.
Checking for the presence of refrigerant
?
In order to recognise a flammable atmosphere in time:
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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 or powder extinguisher must be to hand in the following ca-
2
ses:
Refrigerant is being drained.
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Refrigerant is being topped up.
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Welding or brazing/soldering work is being carried out.
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Sources of ignition
$
When carrying out work on a refrigerant circuit that contains or
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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 materials and ignition sources.
Display no smoking signs.
■
(cont.)
Outdoor unit maintenance
Completed Comments
137