112
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 fuse or a main switch. Check
that no installed power circuits of the indoor
and outdoor unit are still 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.
!
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).
Opening the indoor unit
See page 44.
Opening the outdoor unit
See page 51.
Checking the expansion vessel and system pressure
■
Use the calculation to DIN 4807-2 to check whether
the installed expansion vessel is adequate for the
system water volume.
If the expansion vessel fitted is insufficient, equip the
secondary circuit on site with an additional expan-
sion vessel.
■
Check the pre-charge pressure of the expansion
vessel once a year.
Carry out this test on a cold system.
1. Drain the system until "0" is shown on the pressure
indicator.
Calling up system pressure
Operating instructions.
2. If the pre-charge pressure of the expansion vessel
is lower than the static system pressure: Top up
with nitrogen at the valve of the diaphragm expan-
sion vessel until the pre-charge pressure is 0.1 to
0.2 bar (10 to 20 kPa) higher than the static system
pressure.
Note
■
Do not allow the pre-charge pressure to fall
below 0.7 bar (70 kPa) (boiling noises).
■
Factory-set pre-charge pressure: 0.75 to 0.95 bar
(75 to 95 kPa)
3. Top up with water until the charge pressure of the
cooled system is at least 1.0 bar (0.1 MPa), and is
0.3 to 0.5 bar (30 to 50 kPa) higher than the pre-
charge pressure of the expansion vessel: See
chapter "Filling the system".
Permiss. operating pressure: 3 bar (0.3 MPa)
Commissioning, inspection, maintenance
Opening the heat pump
6222080
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