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Make the following hydraulic connections:
– Zone 1 system flow (1)
– Zone 2 system flow (2)
– Zone 1 system return (3).
– Zone 2 system return (4).
– Return from heat pump (5)
– Recirculation (6) (if present) (*)
– Domestic cold water inlet (7)
– Domestic hot water flow (8)
– Safety valve drain (9)
– Delivery to heat pump (10).
Z1
1
OUT
2
Z2
OUT
3
Z1
IN
4
Z2
IN
5
B
6
(*)
Close the outlet if recirculation is not used
4.1.1
Safety valve drain
– Make sure that the drainage pipe (1) supplied is con-
nected to the safety valve (2) and comes out through
the hole (3).
a
The drainage pipe must be connected to the
sewerage system.
2
26 / EN
A
10
9
7
8
Fig. 46
IN
OUT
1
3
Fig. 47
4.1.2
Minimum water content
a
The system must be sized for a minimum water con-
tent of at least 5 litres for every kW of rated power.
If the minimum water content is not observed, the
appliance is not guaranteed to function.
To optimise the system's efficiency, comfort and correct opera-
tion, we recommend:
– reducing the set-point temperature of the room dur-
ing winter operation when the outdoor temperature
increases.
– increasing the set-point temperature of the room dur-
ing summer operation when the outdoor temperature
decreases.
Should this not be possible, we recommend increasing the wa-
ter content in the system.
If, for an extended period of time, the minimum thermal load is
lower than the minimum power delivered by the machine, we
recommend increasing the water content in the system.
4.1.3
Expansion vessel
The indoor unit is equipped with an expansion vessel with 12 l
nominal capacity pre-charged to 1 bar and with a safety valve
(3 bar) on the hydraulic circuit.
i
The installer is responsible fro ensuring that the
expansion vessel is suitably sized in relation to
the system's total water content, regardless of
the valves that can exclude certain parts of the
hydraulic circuit.
4.1.4
Rated and minimum flow rate
The minimum flow rate must always be guaranteed in all op-
erating conditions.
Model
Nominal
flow rate
[l/h]
NIMBUS EXT
640
R32 35 M
NIMBUS EXT
860
R32 50 M
NIMBUS EXT
1400
R32 80 M &
M-T
NIMBUS EXT
2100
R32 120 M &
M-T
NIMBUS EXT
2600
R32 150 M &
M-T
Hydraulic connections
Minimum
Flow meter
flow rate
ON thresh-
[l/h]
old [l/h]
430
390
430
390
600
540
770
702
940
852
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