6
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 load 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 37).
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.
■
Always re-establish all earth connections of
the heat pump.
■
The heat pump and pipework must be connec-
ted to the equipotential bonding of the build-
ing.
!
Please note
Observe all information in the "Safety instruc-
tions".
Likewise in the chapters "Routing electrical
cables/leads to the heat pump wiring chamber"
(page 36) and "Power connection"
(page 48).
Working 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.
Danger
Falling of heavy or unwieldy heat pump compo-
nents can result in life threatening crushing or
breaks.
■
Always use suitable ropes/slings and lifting
gear when installing/dismantling compressors,
heat exchangers and similar.
■
Wear appropriate protective clothing (e.g.
safety boots) in compliance with applicable
regulations on accident prevention and in line
with trade association recommendations.
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 working on it.
■
If at all possible, avoid touching the injection
valve and compressor; 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.
■
Always observe regulations and guidelines on
handling this type of refrigerant.
Safety and liability
Occupational safety
(cont.)
5549 984 GB
Service
Summary of Contents for KWT BW 301.B090
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