Operation signal and error signal (status)
You can choose between an alarm or operation signal using parameter
.
If the boiler is operating, the operation signal can be switched via a po
tential-free contact (maximum 230 VAC, 1 A) on the No and C terminals
of the connector.
If the boiler is locked out, the alarm signal can be transmitted via a po
tential-free contact (maximum 230 VAC, 1 A) on the Nc and C terminals
of the connector.
Connection options for the PCB (SCU-X01)
The SCU-X01 PCB has two potential-free contacts (status), which can be
configured as required. Depending on the setting, a maximum of two mes
sages about the status of the boiler can be transmitted. See table. Select
the messages required using rotary knobs SW1 and SW2. Use rotary
knob SW1 for messages on the status connector X3. Use rotary knob
SW2 for messages on the status connector X4.
Tab.21 Configuring the rotary knobs
Position
C-NO
C-NC
0
Alarm standby
Alarm active
1
Alarm inverted active
Alarm inverted standby
2
Burning standby
Burning active
3
Burning inverted active
Burning inverted standby
4
Burning low standby
Burning low active
5
Burning high standby
Burning high active
6
Maintenance message stand
by
Maintenance message active
7
CH mode standby
CH mode active
8
DHW mode standby
DHW mode active
9
CH pump standby
CH pump active
6.7 Filling the system
6.7.1 Water treatment
In many cases, the boiler and central heating system can be filled with
normal tap water and water treatment will not be necessary.
Warning
Do not add chemical agents to the central heating water without
consulting Remeha. For example: antifreeze, water softeners, pH-
increasing or lowering agents, chemical additives and/or inhibitors.
Such agents can cause errors in the boiler and damage to the
heat exchanger.
Note
For untreated water, the pH value of the water in the installation
must be between 7 and 9 and for treated water between 7 and
8.5.
The maximum hardness of the water in the installation must be
between 0.5 and 20.0 °dH (dependent on the total heat output
generated).
More information is available in our Water quality regulations.
Always adhere to the instructions in the aforementioned docu
ment.
Fig.34 SCU-X01 PCB
AD-0000059-01
SCU-X01
X2
X2a
X4
Status
C
Nc
No
C
Nc
No
X3
Status
C
Nc
No
C
Nc
No
SW2
SW1
6 Installation
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