Nimbus Compact M NET R32 Installation Manual UK

Hydraulic connections
4.1.1 Safety valve drain
a
– Make sure that the drainage pipe (1) supplied is connected
to the safety valve (2) and comes out through
the hole (3).
The drainage pipe must be connected to the
sewerage system.
2
1
3
Fig. 42
4.1.2 Minimum water content
a
The system must be sized for a minimum water
content 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 operation,
we recommend:
– reducing the set-point temperature of the room during
winter operation when the outdoor temperature
increases.
– increasing the set-point temperature of the room during
summer operation when the outdoor temperature
decreases.
Should this not be possible, we recommend increasing the water
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 a 12
l nominal capacity pre-charged to 0.1 MPa (1 bar) and with a
0.3 MPa (3 bar) safety valve 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 operating
conditions.
Model
NIMBUS M
EXT R32 35 M
NIMBUS M
EXT R32 50 M
NIMBUS M
EXT R32 80 M
& M-T
NIMBUS M
EXT R32 120
M & M-T
NIMBUS M
EXT R32 150
M & M-T
Nominal
flow rate
[l/h]
Minimum
flow rate
[l/h]
Flow meter
ON threshold
[l/h]
600 430 390
860 430 390
1200 600 540
1550 770 702
1900 940 852
26 / EN