Safety And Liability; Work On The Refrigerant Circuit - Viessmann Vitocal 300-G Pro SPS Installation And Service Instructions For Contractors

Safety and liability

Occupational safety
Danger
Contact with 'live' components can lead to seri-
ous injury from electric current. Some compo-
nents on PCBs remain 'live' even after the
power supply has been switched off.
Isolate the system from its power supply (e.g.
■
at a separate MCB/fuse or mains isolator),
check that there are no 'live' currents and
safeguard against reconnection.
Note
In addition to the control circuit there may be
several power circuits.
Prior to removing the heat pump covers, wait
■
at least 4 min until the voltage has completely
dropped out.
■ Never touch the terminal area of the heat
pump control unit or power connections (see
page 29).
Work on the heat pump
!
Please note
Prior to commissioning and following repair or
maintenance work check
that the heat pump is in the intended condition.

Work on the refrigerant circuit

Danger
Refrigerant circuits of heat pumps develop
extremely low ( 25 °C) and very high (+130 °C)
–
temperatures. Work on heat pumps can result in
life threatening frostbite and burns.
■ Switch OFF the heat pump at least 30 min
before maintenance work.
■ Never touch the injection valve or compressor
with bare hands; wear safety gloves if contact
is necessary.
Wear suitable protective clothing.
■
Danger
R410A is a non-poisonous gas that displaces
air. Unregulated escape of refrigerant R410A in
enclosed spaces can result in difficulties in
breathing and suffocation.
■ Never breathe in refrigerant vapours.
■ Ensure adequate ventilation in enclosed
spaces.
■ Prevent open flames.
Observe regulations and guidelines on han-
■
dling this type of refrigerant.
6
(cont.)
Danger
The absence of component earthing can result
in serious injury from electrical current and in
component damage in the event of an electrical
fault.
Remake all earth connections inside the heat
■
pump.
Heat pump and pipework must be grounded to
■
the equipotential bonding of the building.
!
Please note
Observe all information in the "Safety instruc-
tions".
Likewise in chapters "Routing cables to the heat
pump wiring chamber" (page 28) and "Power
supply" (page 37).
Danger
Falling of heavy or unwieldy heat pump compo-
nents can result in life threatening crushing or
breaks.
■ Use suitable ropes/slings and lifting gear when
installing/dismantling compressors and heat
exchangers, for example.
Wear appropriate protective clothing (e.g.
■
safety boots) in compliance with applicable
regulations on accident prevention and in line
with trade association recommendations.
Danger
Direct contact with refrigerant can be harmful to
skin.
Only work on the refrigerant circuit whilst
■
wearing safety goggles and gloves.
Note
Work on the refrigerant circuit must only be
carried out by a qualified refrigeration engi-
neer.
Wear suitable protective clothing.
■