- 30 -
Hydraulic connections
See
"Basic Hydraulic Layout", page 72
►
Heating circuit
▼
Flushing the installation
Before connecting the hydraulic unit to the installation,
rinse out the heating system correctly
to eliminate
any particles that may a
ff
ect the appliance's correct
operation.
Do not use solvents or aromatic hydrocarbons (petrol,
para
ffi
n, etc.).
Flush the installation several times before
proceeding to the
fi
nal
fi
lling.
In the case of an old installation, provide a su
ffi
ciently
large decanting pot with a drain on the return from the
heat pump and at the lowest point in the system in order
to collect and remove any impurities.
In some installations, the presence of di
ff
erent
metals can cause corrosion problems;
the formation of metal particles and sludge can appear
in the hydraulic circuit. In this case, it is advisable to use
a corrosion inhibitor in the proportions indicated by the
manufacturer. You must also ensure that treated water
does not become corrosive (neutral pH: 7 <pH <9).
Flush the installation several times before
proceeding to the
fi
nal
fi
lling.
▼
Connections
The heating circulation pump is built into the hydraulic
unit.
Connect the central heating pipes to the hydraulic unit
correctly according to the direction of circulation.
The pipe between the hydraulic unit and the heat collector
must be at least one inch in diameter (26x34 mm).
Calculate the diameter of the pipes based on
fl
ow rates
and lengths of the hydraulic systems.
Tightening torque: 15 to 35 Nm.
Use union connectors to make it easier to remove the
hydraulic unit.
Try to use connection hoses to avoid transmitting noise
and vibrations to the building.
Connect the drains from the drain valve and the safety
valve to the main sewer system.
Verify that the expansion system is correctly connected.
Check the expansion vessel pressure (pre-in
fl
ated to
1 bar) and the safety valve is calibrated.
The
fl
ow rate of the installation must be at least equal
to the minimum value mentioned in the table
"General
characteristics", page 7
. The installation of a regulator
(other than those included in our con
fi
gurations) which
reduces or stops the
fl
ow through the hydraulic unit is
prohibited.
Key:
1. "Liquid" refrigeration connection.
2. "Gas" refrigeration connection.
3. Heating return (1 circuit).
4. Heating
fl
ow (1 circuit).
5. Stop valve (not provided).
6. DHW outlet (domestic hot water).
7. DCW inlet (domestic cold water).
8. Shut-o
ff
(not provided).
9. Filling.
10. Safety valve (mandatory / not supplied).
11. Connections to sewer with siphon
(safety valve).
fi
g. 30 - Connections
1
2
3
5
4
6
7
8
9
10
11
5
Alfea Extensa A.I. R32 / INSTALLATION / 2114 - EN
