Riello 20161608, Installation And Technical Service Instructions

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20
INStAllAtION
2.10.1 Piping connections
NXH
A Factory connections
B Field connections (for installer)
1 Plate heat exchanger
2 Temperature sensor
3 Circulation pump
4 Safety valve
5 Flow switch 6 Expansion vessel
7 Mesh filters (available as an option)
8 Stop valves
9 Filling valve
10 Pressure gauge
11 Discharge tap
12 by-pass valve for freezing protection
13 Calibration valve
14 Anti-vibration joint
15 Additional expansion vessel (if nec-
essary)
16 Air bleed
17 Thermometer
T
T
1
2
2
3
4 5
6
7
A B
8 9 8
10
11
12
13 8
8
8
8
14
14
15
16
16
17
17
The hydraulic connections must be completed by installing:
— mesh filters (available as an option)
— Discharge tap
—
additional expansion tank (if necessary)
— a suitably sized technical water storage tank
— filling group
— return and delivery thermometers
— air vent valves in the highest points of the pipes
— flexible elastic joints
— shut-off valves
— shut-off valves for chemical washing
— una valvola di by-pass tra mandata e ritorno dell'apparec-
chio, per protezione antigelo durante il periodo invernale
Cascade units
1 Stop valves
2 Calibration valve
3 Check valve
4 Cascade probe
1 1 1 1
1 1 1 1
2
3
2
3
2
3
2
3
4
9
Only units of the same model can be cascaded.