Appendix
A
Functional diagram
1
Automatic air vent
2
Flow temperature sensor: Electric back-up heater
output
3
Building circuit, flow
4
Building circuit, return
5
Back-up heater
6
Heating flow from the outdoor unit
7
Heating return to the outdoor unit
8
Prioritising diverter valve
9
Protection anode
0020291525_04 Installation and maintenance instructions
18
17
16
15
1
2
10
Cylinder temperature sensor
11
Manometer
12
Filling/draining cock
13
Isolation valve
14
Draining cock, heat pump and heating circuit
15
Domestic hot water cylinder's draining cock
16
Diaphragm expansion vessel
17
Cold water
18
Domestic hot water
3
4
5
6
7
8
9
10
11
12
13
14
45