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For details concerning vacuuming and operating the unit during
vacuuming, see installation manual of outdoor unit.
For details concerning piping sizes and refnet selection, see
installation manual of the outdoor unit.
NOTICE
Do NOT put power on the unit before vacuuming is
completed. In case this happened, refer to the instructions
in the installation manual of the outdoor unit to avoid dirt,
air or nitrogen to be trapped in the piping.
7.2.
Connecting the water piping
7.2.1.
To connect the water piping
NOTICE
Do NOT use excessive force when connecting the piping.
Deformation of the piping can cause malfunctioning of the
unit.
To facilitate service and maintenance, 2 shut-off valves are provided.
Mount the valves on the water inlet and on the water outlet. Mind their
position. Orientation of the integrated drain valves is important for
servicing.
1
Install the shut-off valves on the water pipes.
b
a Water inlet
b Water outlet
2
Screw the indoor unit nuts on the shut-off valves.
3
Connect the field piping on the shut-off valves.
NOTICE
It is recommended to install a pressure reducing valve on
the cold water inlet in accordance with the applicable
legislation.
7.2.2.
To install the bottom plate and connect safety valve
drain hose
1
3
HXY080+125A8V1B
VRV IV System indoor unit
4P405267-1B – 2016.02
a
4x
2
7.2.3.
To fill the water circuit
1
Connect the water supply hose to the drain and fill valve.
2
Open the drain and fill valve.
3
Make sure that the automatic air purge valve is open (at least 2
turns).
4
Fill the circuit with water until the manometer indicates a
pressure of ±2.0 bar.
5
Purge as much air as possible from the water circuit.
NOTICE
Air in the water circuit can cause malfunctioning of the
flow switch. During filling, it may not be possible to
remove all the air from the circuit. Remaining air will
be removed through the automatic air purge valves
during the initial operating hours of the system.
Additional filling with water afterwards may be
required.
Pump only operation in order to purge the air of the
system is possible through field settings. Refer to field
settings of [E-04] in the chapter
page 21
for further details.
The unit might dispose some excessive water through
the pressure relief valve.
Water quality must be accordingly to EU directive
98/83 EC.
6
Close the drain and fill valve.
7
Disconnect the water supply hose from the drain and fill valve.
NOTICE
The water pressure needle on the manometer will vary
depending on the water temperature (higher pressure at
higher water temperature).
However, at all times water pressure shall remain above
1 bar to avoid air entering the circuit.
7.2.4.
To insulate the water piping
The piping in the complete water circuit must be insulated to prevent
condensation during cooling operation and reduce capacity losses
during heating and cooling operations.
If the temperature is higher than 30°C and the humidity is higher than
RH 80%, the thickness of the sealing materials should be at least
20 mm to prevent condensation on the surface of the sealing.
"[E] Service mode" on
Installation and operation manual
13
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