Figure 7: Typical Diagram Of The Hydraulic Circuit - Riello NXHP Series Installation, Operation And Maintenance Instructions

2 - INSTALLATION OF UNIT
2.3.4 - Maximum water loop volume
The installer must add expansion tank, suitable for the volume of the installation.
The unit is not provided with an expansion vessel, the installer must add an expansion vessel suitable for the water loop volume (taking
into consideration the Ethylen glycol concentration if applicable).
2.3.5 - Hydraulic circuit
Legend:
B
Shut-off valves
C
Line filter for water
D
Pressure gauges
E
Filling valve
F
System drain valve
H
3-way valve
G
Automatic air vent valve
CAUTION: The use of the hydraulic module on open loop is prohibited.

Figure 7: Typical diagram of the hydraulic circuit

D
K
B
D
B
L
C
G
E
H I
F
I
Sanitary water accumulation tank
J
Inside system
K
Expansion vessel
L
Antifreeze valve (outdoor lowest points, recommended in cold climates without
antifreeze solution)
J
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