44
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 (heat pump
control unit and power supplies for internal
and external units, see chapter "Internal unit:
Overview of connections" and "External unit:
Overview of connections").
■
When working on the appliances (internal/
external units), isolate the system from the
power supply, e.g. at the separate MCB/fuse
or at a mains isolator. Check the system is no
longer 'live' and safeguard against reconnec-
tion.
■
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.
Always
remake all earth connections.
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 must
only
be car-
ried out by a certified contractor (in accordance
with EC 842/2006 and 303/2008).
1.
Removing the front panel: See page 15.
2.
Close the heat pump after completing all work: See
page 41.
Regarding commissioning this appliance, see
also the operating instructions.
Compiling reports
Enter the readings taken during commissioning into
the reports from page 104 and the operator's log (if
available).
Purging the refrigerant lines and the internal unit
Purge the refrigerant lines and the internal unit with
nitrogen.
The internal unit is filled with nitrogen (positive pres-
sure approx. 1 to 2 bar/0.1 to 0.2 MPa).
Checking tightness of the refrigerant lines
Check tightness and pressure with dry nitrogen with at
least 20 bara/2.0 MPa (max. 43 bara/4.3 MPa).
Commissioning, inspection, maintenance
Opening the heat pump
5700 542 GB