Potterton NXR3i Installation And Service Manual page 14

1 Heating flow
2 Heating return
3 3-bar safety valve + Pressure gauge
5 Flow switch
6 Air separator
7 Automatic air vent
9 Isolating valve
10 3-way mixing valve
11 Boiler pump
12 Sludge decanting pot (particularly recommended on older
installations)
13 Flush valve
14 Water low safety pressure-sensitive switch
15 Shunt pump
16 Expansion vessel
17 Drain cock
18 Heating circuit filling (with disconnector depending on prevailing
regulations)
19 Water treatment
20 Water meter
26 DHW load pump
27 Non-return valve
28 Domestic cold water inlet
29 Pressure reducer (if mains pressure > 5.5 bar)
30 Sealed safety unit calibrated to 7 bar with indicator type discharge
31 Independent domestic hot water tanks
32 Domestic hot water loop pump (optional)
56 Domestic hot water circulation loop return
57 Domestic hot water outlet
14
NXR3i NXR3i 28/08/2012 - 300029292-001-02 28/08/2012 - 300029292-001-01