Connection Diagram - Riello NexPolar Series Installation And Technical Service Instructions

2.10.1

Connection diagram

NexPolar
2
1
a Factory connections
B Connections to be made by the installer
1 Brazed plate heat exchanger
2 Heat exchanger electric heating ele-
ment
3 Temperature probe
4 Pipe electric heating element
5 Circulation pump
The water connections must be completed by installing:
— expansion tank
— an appropriately sized technical water accumulation tank
— filling unit
— pressure gauges on the return and delivery lines
— air vent valves at the pipes' highest points
Cascade units
1
1 Shut-off valve
2 Balancing valve
3 Check valv2
4 Cascade probe
9
Only units of the same model can be connected in cascade
configuration.
A
A
3 6 7
4
9
5
8
3
6 Safety valve
7 Flow Switch
8 Discharge valve
9 Mesh filter
10 Shut-off valve
11 Filling unit
12 Pressure gauge
13 Discharge valve
3 3
2 2
1
B
10 11 10
10
13
16
10
12 14
10
13
15 10
16
14 By-pass valve for protection against
15 freezing
16 Balancing valve
17
18 Expansion tank
19 Air vent
20 Thermometer
— flexible elastic joints
— shut-off valves
— shut-off valves for chemical washing
— a by-pass valve between the device's delivery and return
lines, in order to prevent freezing during the wintertime
3
2
1
19
INSTALLATION
T
17 18 19
T
18 19
Anti-vibration joints
4
3
2
1