1 Boiler flow
1a Heating flow direct circuit
2 Heating pump
2a Heating return direct circuit
3 4 bar (0.4 MPa) safety valve
7 Automatic air vent
9 Isolation valve
16 Closed expansion vessel
18 Heating circuit fill point
24 Domestic hot water tank exchanger primary inlet
25 Domestic hot water tank exchanger primary outlet
26 DHW load pump
27 Non-return valve
30 Calibrated and sealed safety unit
30e Drain valve
31 Independent domestic hot water tank
33 Domestic hot water temperature sensor
34 Modulating boiler pump
35 Low-loss header (accessory)
38 Remote control
64 Direct heating circuit
119 Boiler return
5.6.2
Connection diagram: 1 1 direct c 1
underfloor heating c 1 domestic hot water tank
Fig.31
1 1 direct c 1 underfloor heating c 1 domestic hot water tank
MW-3000019-04
30
T
7
7
31
24
25
33
9
9
1a
35
2a
119
30e
7
16
27
18
38
38
9
T
S
44
61
93
2
27
27
9
117
65
64
9
9
26
27
2c
27
34
1
3
1 Boiler flow
1a Heating flow
2 Heating pump
2a Heating return
2c Three-way valve bypass
3 4 bar (0.4 MPa) safety valve
7 Automatic air vent
9 Isolation valve
16 Closed expansion vessel
18 Heating circuit fill point
24 Domestic hot water tank exchanger primary inlet
25 Domestic hot water tank exchanger primary outlet
26 DHW load pump
27 Non-return valve
30 Calibrated and sealed safety unit
30e Drain valve
31 Independent domestic hot water tank
33 Domestic hot water temperature sensor
34 Modulating boiler pump
35 Low-loss header (optional)
38 Remote control with or without room temperature
sensor
44 Safety device to safeguard against overheating of
the underfloor heating system, in accordance with
prevailing regulations
61 Thermometer
64 Direct heating circuit (example: radiators)
65 Heating circuit with mixing valve, may be low
temperature heating circuit (underfloor heating or
radiators)
93 Heating pump for underfloor heating circuit
117 Three-way mixing valve
119 Boiler return
5 Before installation
7609493 - v08 - 24072018
33
