Electrical Connection Options; Connection Options Of Standard Control Unit (Pcu-01); On/Off Control (Ot); Modulating Controls (Ot) - DeDietrich C230 ECO-A 120 Installation, Operating And Service Manual

C230 ECO-A
8.4

Electrical connection options

Fig. 11 Standard control PCB (PCU-
01) with safety unit (SU)
The boiler has several control, protection and regulation connection
options. The standard control PCB (PCU-01) can for example be
expanded with:

an optional 0 - 10 V control PCB (available as an accessory IF-
01);

and/or the optional expanded control/protection PCB (available
as an accessory SCU-S01).
To install or access these PCBs, the plastic cap must be removed
from the control panel. The required external connections are made
on these (optional) PCBs. The various connection options are
detailed in the following sections.
8.4.1 Connection options of standard control unit
(PCU-01)
Connected on the standard control unit (PCU-01) is the safety unit
(SU) connected, which protects the boiler.

8.4.2 On/off control (OT)

The boiler is suitable for connection to a 'volt free' on/off controller.
Connect the controller to the On/off - OT terminals of terminal strip
X6 (not polarity sensitive).

8.4.3 Modulating controls (OT)

The boiler is set up for communication via the OpenTherm protocol.
Modulating controllers can be connected.
Connection is made with a two-core cable to the On/off - OT
terminals of terminal strip X6 (it does not matter which wire is
connected to which cable clamp).
8.4.4

External interlock (BL)

The boiler has an external interlock switch, so that the boiler can be
shutdown in the event that this switch is not made. This input can be
used in combination with a flue gas thermostat (available as an
accessory). This input relates to the BL terminals of terminal strip X6.
Remove the wire bridge before using the input. For example, low
water controls and auxiliary safety limit(s).
The input's behaviour depends on the parameter 33 setting:
1 = Normal shutdown;
2 = Shutdown without frost-protection (= default);
3 = Lock out.
8 Control and electrical connections
41