Maintenance Cleaning; Inspection And Maintenance; Dhw Cylinder; Safety Valve (Dhw Cylinder) - Viessmann VITOCAL 150-A Operating Instructions For The System User

Cleaning
Clean the surface of the programming unit with a
microfibre cloth.
!
Please note
Commercially available domestic cleaning
agents and special cleaning agents for the heat
exchanger (evaporator) can damage the indoor
and outdoor units.
Clean the appliance surfaces only with a damp
■
cloth.
■ If necessary, clean the heat exchanger fins
(evaporator) on the back of the outdoor unit
only with a hand brush with long bristles.
!
Please note
Commercially available cleaning agents can
damage the surface of the external casing.
■ Use only mild water-based domestic cleaning
agents.
Do not use substances containing acids or
■
solvents, such as vinegar-based cleaners,
nitro or synthetic resin solutions, nail varnish
remover, ethyl alcohol, etc.

Inspection and maintenance

The inspection and maintenance of a heating system
is prescribed by the German Buildings Energy Act and
the DIN 4755, DVGW-TRGI 2018, DIN 1988-8 and
EN 806 standards.
Regular maintenance ensures trouble-free, energy effi-
cient, environmentally responsible and safe heating
and cooling operation. For this, it is best to arrange an
inspection and maintenance contract with your local
heating contractor.

DHW cylinder

Standards DIN 1988-8 and EN 806 specify that main-
tenance and cleaning should be carried out no later
than 2 years after commissioning and as required
thereafter.
Only a qualified contractor should clean the inside of
the DHW cylinder and the DHW connections.

Safety valve (DHW cylinder)

The function of the safety valve must be checked
every six months by the user or a contractor through
venting (see valve manufacturer's instructions). The
valve seat may become contaminated.
Water may drip from the safety valve during a heat-up
process. The outlet is open to the atmosphere.
!
Please note
Mechanical influence will scratch the surface of
the external casing.
Only wipe the surface with a soft damp cloth.
■
■ Do not use substances that contain abrasive
particles such as polishes, scouring agents,
dirt erasers or scouring pads.
■ Do not clean the external casing with a pres-
sure washer.
Note
Your outdoor unit contains highly flammable refrigerant
of safety group A3. To ensure operational reliability
over the entire service life of the heat pump, there are
special requirements for inspection and maintenance.
A special test of safety equipment is required after
12 years. Please contact your contractor.
If any water treatment equipment (e.g. a sluice or
injection system) is installed in the cold water supply of
the DHW cylinder, ensure this is refilled in good time.
For this, observe the manufacturer's instructions.
!
Please note
Overpressure can cause damage.
Do not close the safety valve.
Maintenance
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