Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 3

Safety instructions
Regulations to be observed
National installation regulations
■
Statutory regulations for the prevention
■
of accidents
Statutory regulations for environmental
■
protection
Statutory requirements for pressure
■
equipment:
Pressure Equipment Directive
2014/68/EU
Codes of practice of the relevant trade
■
associations
Safety instructions for working on the system
The outdoor unit contains flammable
refrigerant R290 (propane C3H8). If
there is a leak, the escaping refrigerant
may form a flammable or explosive
atmosphere in the ambient air. A safety
zone is defined in the immediate vicinity
of the outdoor unit, in which special
rules apply when working on the appli-
ance.
Working in the safety zone
Danger
Risk of explosion: Escaping refrig-
erant may form a flammable or
explosive atmosphere in the ambi-
ent air.
Take the following measures to pre-
vent fire and explosion in the safety
zone:
(cont.)
Relevant country-specific safety regu-
■
lations
Applicable regulations and guidelines
■
for operation, service, maintenance,
repair and safety of cooling, air condi-
tioning and heat pump systems con-
taining flammable and explosive refrig-
erant.
Keep ignition sources away, e.g. naked
■
flames, hot surfaces, electrical devices
not free of ignition sources, mobile
devices with integrated batteries (e.g.
mobile phones, fitness watches, etc.).
Permissible tools:
■
All tools for working in the safety zone
must be designed and explosion pro-
tected in accordance with the applica-
ble standards and regulations for
refrigerant in safety groups A2L and
A3, e.g. brushless machines (cordless
screwdrivers), extraction equipment,
disposal containers, installation aids,
vacuum pumps, conductive hoses,
mechanical tools of non-sparking
material, etc.
Note
The tools must also be suitable for the
pressure ranges in use.
Tools must be in perfect maintenance
condition.
The electrical equipment must meet
■
the requirements for areas at risk of
explosion, zone 2.
Do not use flammable materials, e.g.
■
sprays or other flammable gases.
Discharge static: Before beginning
■
work, touch earthed objects, such as
heating or water pipes.
Safety instructions
3