1 Heat generator
2a Heat generator pump in the heat generation circuit
2b Heating pump (heating circuit 1)
2c Heating pump (mixing circuit 2)
5 Domestic hot water cylinder
10 Thermostatic radiator valve
13 Weather compensator
15 3-way mixer
16 outside temperature sensor
17a Flow temperature sensor
17b Flow temperature sensor (heating circuit 2, mixing
circuit)
19 Maximum thermostat
21a Remote control (radiator circuit)
21b Remote control (underfloor circuit)
24 Cylinder temperature sensor
27 Cylinder charging pump
30 Non-return valve
31 Flow limiter
32 Cap valve
33 Sludge separator
42a Expansion relief valve
42b Expansion vessel
43 Safety group
45 Low loss header
46 Circulation pump
47 Air separator
52 Room temperature-controlled valve
B Start-up checklist
No. Procedure Comment
Required tool
1 Checking the gas flow pressure The gas flow pressure relative to the
atmospheric pressure must be 1.8-
2.5 kPa (18-25 mbar) with G20 nat-
ural gases. For natural gas, the gas
connection pressure (resting pres-
sure) must not deviate from the gas
flow pressure by more than 0.5 kPa
(5 mbar).
U tube or digital pressure gauge
2 Check whether the condensate siphon
has been filled
If required, fill it via the flue spigot (at
least 1.5 l water)
3 Check the electrical connection Power supply: Terminals L, N, PE
Control terminals: "Bus", or 7-8-9 or 3-4
4 Switch on the product, the display view
is active
Otherwise, check the fuses (4 OT)
5 Activate the maximum output operation Press the + and − buttons at the same
time
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