Connection Options Of The Optional Expanded Control/Protection Pcb (Scu-S01); Flue Gas Damper Control (Fgv); Hydraulic Valve Control (Hdv); External Gas Valve Control (Egv) - DeDietrich C230 ECO-A 120 Installation, Operating And Service Manual

C230 ECO-A
8.7 Connection options of the optional expanded control/protection PCB (SCU-
S01)
Fig. 18 Expanded control/protection
PCB (SCU-S01).

8.7.1 Flue gas damper control (FgV)

In a cascade configuration, a flue gas damper prevents flue gases
from being discharged through a non-operating boiler, with flue gas
cascade. Therefore, the boiler is suitable for flue gas overpressure
systems. Consult our Technical department. Connect the flue gas
damper to the FgV terminals of terminal strip X3. Also fit this flue gas
damper if flue gases flow back when the boiler is in stand-by mode.
The running time of the flue gas damper must be programmed with
parameter 29.

8.7.2 Hydraulic valve control (HdV)

In a cascade configuration, a hydraulic valve prevents heat loss when
the boiler is not running. Connect the hydraulic valve to the HdV
terminals of terminal strip X3. The running time of the hydraulic valve
must be programmed with parameter 28.

8.7.3 External gas valve control (EgV)

If there is a heat demand, an alternating voltage of 120 V 1 A
(maximum) becomes available on the EgV terminals of terminal strip
X3 to control an external gas valve. The voltage is switched off when
the gas multiblock on the boiler closes.

8.7.4 Operation signal and failure signal (Nc / No)

The alarm or operation signal is selected using the relevant
parameter 25, see Section 8.1.6. If the boiler is operational, the
alarm or operation signal can be switched via a potential-free contact
(maximum of 120 V, 1 A) on the No and C terminals of terminal strip
X4. If the boiler locks out, the alarm can be transmitted via a potential-
free contact (maximum 120 V, 1 A) on terminals No and C of terminal
strip X4.
8.7.5

Water pressure sensor (Wps)

The water pressure sensor shuts the boiler down when the minimum
water pressure (11.6 psi, 0.8 bar) is reached. To activate the water
pressure sensor, a minimum pressure must be set with parameter
26 (factory setting 0 = off, see Section 9.1.6) The pump does not
run during this shutdown.
Connect the water pressure sensor to the Wps terminals of terminal
strip X5.
0 = Earth or neutral of the power supply
S = Signal or output from the sensor
+ = Supply voltage
8 Control and electrical connections
47