60
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.
■
Never touch the wiring chambers: See chap-
ter "Indoor unit: Overview of connections" and
"Outdoor unit: Overview of connections".
■
When working on the appliances (indoor/
outdoor units), isolate the system from the
power supply, e.g. at the separate MCB/fuse
or a mains isolator. Check that it is no longer
live. Safeguard against unauthorised recon-
nection.
■
Prior to working on the appliance, wait at
least 4 min until the voltage has completely
dropped out.
Danger
The absence of system component earthing can
lead to serious injury from electrical current and
component damage in the event of an electrical
fault.
All earth conductor connections must be recon-
nected.
The appliance and pipework must be connected
to the equipotential bonding of the building.
!
Please note
Commissioning immediately after installation
can lead to appliance damage.
Wait at least 30 min between installing and
commissioning the appliance.
!
Please note
Refrigerant can escape when working on the
refrigerant circuit.
■
Work on the refrigerant circuit may only be
carried out by qualified personnel.
In accordance with Regulations EU 517/2014
and 2015/2067.
■
Ventilate the installation room during installa-
tion, maintenance and service, e.g. through
windows or doors.
■
Do not operate an ignition source in the instal-
lation room.
1. Remove the front panel: See page 36.
2. When work is complete, close the heat pump: See
page 57.
For commissioning the appliance, see also the
"Vitotronic 200" operating instructions.
Compiling reports
Enter the readings taken during commissioning in the
reports on page 99 onwards and the operator's log (if
available).
Purging the refrigerant lines and indoor unit
Note
The indoor unit is filled with nitrogen at the factory;
positive pressure 1 to 2 bar (0.1 to 0.2 MPa).
Purge the refrigerant lines and indoor unit with nitro-
gen:
■
Keep the valves on the outdoor unit closed. Fill the
system with nitrogen through the service valve.
■
The test pressure is the max. permissible operating
pressure.
Checking the refrigerant lines for leaks
Perform a tightness and pressure test with dry nitrogen
at min. 20 bara (max. 43 MPa).
Commissioning, inspection, maintenance
Opening the heat pump
6199592
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