Venting The System; Opening The Heat Pump - Viessmann VITOCAL 151-A Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Building up the system pressure
Activate system pressure function
To activate this function, start the commissioning assis-
tant.

Venting the system

1. In the commissioning assistant, the "Venting"
function can be started directly after filling:
Confirm the query "Would you like to continue
with the venting program?" with
2. Once the "Venting" function has started, the entire
system is automatically vented by means of the
quick-action air vent valve in the outdoor unit. The
quick-action air vent valve is on the float air vent
valve: See "Overview of internal components".
For this the 4/3-way valve moves through different
positions in turn.
Activating the venting function
To activate this function, start the commissioning assis-
tant.

Opening the heat pump

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 electrical terminal areas.
When working on the indoor or outdoor unit,
■
isolate the system from the power supply, e.g.
at a separate MCB/fuse or a mains isolator.
Check that it is no longer live. Safeguard
against unauthorised reconnection.
■ 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.
78
(cont.)
See page 69.
3. The "Venting" function ends automatically.
The display shows the system pressure.
The venting process can take up to 20 min.
. Note
In case of a large system pressure drop, restore
the system pressure: See chapter "Establishing
system pressure".
See page 69.
!
Please note
Refrigerant can escape when working on the
refrigerant circuit.
■
■
Always observe regulations and guidelines on
handling this type of refrigerant.
Work on the refrigerant circuit must only be
carried out by a certified contractor (in accord-
ance with Regulations (EU) No 517/2014 and
2015/2067).