Opening The Heat Pump; Compiling Reports; Purging The Refrigerant Lines And The Internal Unit; Checking Tightness Of The Refrigerant Lines - Viessmann VITOCAL 222-S Installation And Service Instructions Manual

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 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.

Compiling reports

Enter the readings taken during commissioning into
the reports from page 112 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.

Checking tightness of the refrigerant lines

Performing a tightness and pressure test with dry nitro-
gen at 43 bara/4.3 MPa.
Commissioning, inspection, maintenance
!
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 16.
2. Close the heat pump after completing all work: See
page 47.
Regarding commissioning this appliance, see
also the operating instructions.
The internal unit is filled with nitrogen (positive pres-
sure approx. 2 bar/0.2 MPa).
49