57
Checking electrical connections of the external unit for firm seating
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.
■
When working on the external unit, isolate the
system from the power supply, e.g. at a sepa-
rate MCB/fuse or a mains isolator. Check the
system is no longer 'live' and safeguard
against reconnection.
■
Prior to working on the appliance, wait at
least 4 min until the voltage has completely
dropped out.
Closing the heat pump
See page 47.
Switch ON the power
Switching on the mains power at the main MCB/fuse.
Starting the heat pump
!
Please note
Operating the appliance with insufficient refriger-
ant results in appliance damage.
■
Before starting the appliance, the internal unit
and the refrigerant lines must be charged with
the indicated amount of refrigerant: See chap-
ter "Charging the refrigerant lines and internal
unit".
■
The refrigerant circuit must be checked for
tightness: See chapter "Checking the refriger-
ant circuit for tightness".
■
The fill valves on the external unit must be
open when the appliance is switched on: See
chapter "Charging the refrigerant lines and
internal unit".
Follow the sequence shown
1.
Switch ON external unit voltage.
2.
Wait 2 min.
3.
Switch ON internal unit voltage.
4.
Start internal unit at the ON/OFF switch.
Note
If the internal unit is switched on before the external
unit or the waiting time is shorter than 2 min, the fault
message
"0A Fault external unit"
appears.
"Vitotronic 200" service instructions
Commissioning, inspection, maintenance
Checking thermal insulation of flared connections
5700 562 GB
