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) - REMEHA GAS 210-80 ECO PRO Technical Information

8. Control and electrical connections
8.5 Connection options of the optional expanded control/protection PCB
(SCU-SO1)
F1
X1
X3
SCU-S01
X4
X5
fig. 15 Expanded control/protection PCB (SCU-SO1).
28
Jumper
1
%
* Dependent on the minimum modulation dept (fan rotation speeds set-
tings, pre set 20%)
table 09

8.5.1 Flue gas damper control (FgV)

In a cascade configuration, a flue gas damper (available as an
accessory) 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 Techni-
cal 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.

8.5.2 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
4 AT
HdV terminals of terminal strip X3. The running time of the hydrau-
lic valve must be programmed with parameter 28.

8.5.3 External gas valve control (EgV)

If there is a heat demand, an alternating voltage of 230 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.

8.5.4 Operation signal and failure signal (Nc / No)

The alarm or operation signal is selected using the relevant
X2
parameter 25, see Section 9.1.6. If the boiler is operational,
the alarm or operation signal can be switched via a potential-free
114492LTAL21H007c
contact (maximum of 230 V, 1 A) on the No and C terminals of ter-
minal strip X4. If the boiler locks out, the alarm can be transmitted
via a potential-free contact (maximum 230 V, 1 A) on terminals No
and C of terminal strip X4.

8.5.5 Water pressure sensor (Wps)

The water pressure sensor (available as an accessory) shuts
the boiler down when the minimum water pressure (0.8 bar) is
reached. To activate the water pressure sensor, a minimum pres-
sure must be set with parameter 26 (factory setting 0 = of f, see
Section 9.1.6.) The pump does not run during this shutdown.
Output signal Boiler output
[V] [%]
0 0 - 15
0,5 15 - 18
2,0* - 10 20 - 100
Analogue output signal for boiler output
GAS 210 ECO PRO
Description
Boiler off
Alarm
Delivered boiler output
114494-190310