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4. Hydraulic connections
4.1
Indoor unit hydraulic connections
Preliminary checks:
– check that the system has been cleaned;
– check that there are no impurities in the circuit water;
– check that compatible components are used (e.g. do
not connect copper and steel to each other);
– check that the connection to the water mains has been
made correctly;
– check that the water supply distribution network pres-
sure never exceeds 5 bar, otherwise install a pressure
reducer at the system's intake;
– check that a disconnect device with cock is installed
between the system and the domestic water supply
distribution network (if present);
– check that the supplied expansion vessel is large
enough to handle the water in the system and, if neces-
sary, install an additional one;
After the checks:
1-ZONE configuration
– Mount the quick couplings (present inside the ma-
chine) on the water pipes (1), (3), (7) and (8).
1
3
Make the following hydraulic connections:
– System flow (1)
– Safety valve drain (2)
– Delivery to heat pump (3)
– Recirculation (4) (if present) (*)
– Domestic hot water return (5)
– Domestic hot water flow (6)
– System return (7)
– Return from heat pump (8).
8
7
Fig. 43
A
Z1
1
OUT
2
3
B
5
IN
6
4
(*)
Close the outlet if recirculation is not used
2-ZONE configuration
– Mount the quick couplings (present inside the ma-
chine) on the water pipes (1), (2), (3), (4), (5) and (10).
Hydraulic connections
8
7
Z1
IN
OUT
Fig. 44
10
1
2
3
5
4
Fig. 45
25 / EN
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