59
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 "Overview of connections: indoor unit" and
"Overview of connections: outdoor unit").
■
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 connectors
must
be reconnected.
The appliance and pipework must be connected
to the equipotential bonding of the building.
!
Please note
Commissioning immediately after siting the
appliance can lead to appliance damage.
Wait
at least 30 min
between siting and com-
missioning the appliance.
!
Please note
Refrigerant can escape when working on the
refrigerant circuit.
Work on the refrigerant circuit must
only
be car-
ried out by a certified contractor (in accordance
with EC 842/2006 and 303/2008).
Note
If connections in the refrigerant circuit are separated,
we recommend installing a filter dryer on site.
■
The on-site filter dryer must be able to receive a flow
from both sides (bi-flow).
■
We recommend installing it in the liquid line, outside
the indoor unit but inside the building.
1.
Remove front panel: See page 22.
2.
When work is complete, close the heat pump: See
page 56.
For commissioning the appliance, see also the
"Vitotronic 200" operating instructions.
Compiling reports
Enter the readings taken during commissioning into
the reports on page 126 onwards and the operator's
log (if available).
Purging the refrigerant lines and indoor unit
Purge the refrigerant lines and indoor unit with nitro-
gen.
The indoor unit is charged with nitrogen; positive pres-
sure approx. 1 to 2 bar (0.1 to 0.2 MPa).
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
5790 931 GB
