Work On The Heat Pump; Work On The Refrigerant Circuit - Viessmann BW 30 .CS Series Installation And Service Instructions Manual

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 the power supply (e.g.
■
by removing the separate fuse or by means of
a mains isolator), check that it is no longer live
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 minutes until the voltage has drop-
ped off.
■ Never touch terminal areas 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
Direct contact with refrigerant can be harmful to
the 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.
■
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.
■
(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.
Re-establish all earth connections of the heat
■
pump.
The heat pump and pipework must be groun-
■
ded to the equipotential bonding of the build-
ing.
Note
Observe all information in the "safety instructions".
For further information regarding electrical connec-
tions, see page 28 onwards.
Danger
Heavy and unwieldy heat pump components
can result in life threatening crushing or break-
ages if they fall or are dropped.
■ 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
Refrigerant R410A is a non-poisonous gas that
displaces air. Unregulated escape of refrigerant
R410A in enclosed spaces can result in difficul-
ties 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.
Safety and liability
7