2.19.2
TERMINAL CONNECTIONS FOR EXTERNAL WIRING
HIGH VOLTAGE TERMINALS
TERMINAL DESCRIPTION
1 Live Supply 240 Vac, max. 3.2 A
2 Neutral
3
29
CH pump neutral
CH pump live, 240 Vac, max. 0.8 A
4
30
DHW 3 way valve neutral
DHW 3 way valve live, 240 Vac, max. 0.8 A
5
31
CH 3 way valve or DHW water pump neutral
CH 3 way valve or DHW water pump live, 240 Vac, max. 0.8 A
25 and 26 Common alarm volt free contact, 240 Vac, max 5 A resistive load
27 and 28 Cascade pump On/Off contact, 240 Vac, max 5 A resistive load or 0.5 A inductive
LOW VOLTAGE TERMINALS
TERMINAL DESCRIPTION
6
21
DHW sensor/volt free switch (DHW demand) neutral
DHW sensor/volt free switch (DHW demand) live, max. 30 V
7 and 8 Cascade pump PWM outputs (variable speed)
9 and 10 OpenTherm communication port
11 and 23 External temperature sensor, RTD 10 kΩ @ 25 ˚C
12 and 24 Cascade temperature sensor, RTD 12 kΩ @ 25 ˚C
13
22
CH demand neutral
CH demand live, max. 30 V
14 and 15 Terminal 14 on the Boiler connects to Terminal 15 on the following Boiler in line
16 and 17 Terminal 16 on the Boiler connects to Terminal 17 on the following Boiler in line
18 and 19 Terminal 18 on the Boiler connects to Terminal 19 on the following Boiler in line
20 Terminal 20 on the boiler needs to be linked to Terminal 19 on the slave boiler*
* Refer to Fig.6, Page 22
Boiler Terminal Plugs
The following terminal plugs need to be disconnected for the boilers to operate correctly:
Master Boiler: None
Slave in between other boilers: Terminals 3 to 13 and Terminal 20
Last Slave Boiler: Terminals 3 to 13 and Terminal 19
Note: Plugs do not need to be fully removed to be electrically disconnected. The terminal plugs have two
positions: electrically disconnected and connected.
Fig. 7 shows electrical Terminal plugs 3-13 disconnected, while other terminals are electrically connected. Note
that it is possible to remove the plugs, but not necessary for isolation.
Fig. 9 shows a jumper inserted between Terminal 19 and 20.
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