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Terminal layout
Power connection
1
Outputs
– Heating circuit 1 pump as relay output
– Heating circuit 2 pump as relay output
– Burner as relay output
6
– Mixer closed (or 2nd burner stage) as relay output
– Mixer closed (or 2nd burner stage) as relay output
– Pump for domestic hot water feed as relay output
– Pump for domestic hot water circulation as relay output
Inputs
– Input fault
(see page 4)
9
10
– OpenTherm-Slave (Connection RAMSES 850 top2 OT)
– OpenTherm-Master (Connection of second OT-Box)
– Domestic hot water temperature sensor
– Feed temperature sensor (mixer circuit)
– Boiler temperature sensor
18
– External temperature sensor
– Domestic hot water return temperature sensor
(controls circulation pump)
The connected devices or sensors must be suitable for
SELV or marked with protection class III.
8
7
5
4
3
2
13
14
16
17
19
20
8
7
6
5
L'
L'
L'
L'
N
N
N
8
7
6
12
13
15
11
14
11
12
13
14
not used
11 12 15
5
1
4
3
2
L'
L'
L'
L
N
N
N
N
N
5
4
3
2
1
17
18
19
20
16
15
16
17
18
19
20
GB
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