Connecting External Controls - REMEHA Avanta Range 24c Installation & Service Manual

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fi g. 19

Connecting external controls

LT.AL.W7H.000.024
Remeha Avanta Plus
Manufacturer
Supply voltage
Pre-purge time
Post-purge time
Ignition time
Safety time
Anti-cycling time
Fuse value F1 (230 V)
DC fan
table 04 Control unit characteristics

Any loads other than those specified above are only allowed if
an isolating transformer is used.
The output of the Remeha Avanta Plus can be controlled in
the following ways: Options
1. On/off control – volt free switching - The boilers internal
control will modulate the output to achieve the flow tem-
perature set point of the boiler. This contact is on the con-
nectors 7 and 8 on terminal block X9 (low voltage only).
2. Modulated control – Open Therm - The external controls
will modulate the boiler's output to achieve the flow temper-
ature determined by the modulating regulator. This contact
is on the connectors 7 and 8 on terminal block X9 (low volt-
age only).
3. On/off control – 230 V switching - The boilers internal
control will modulate the output to achieve the flow tempera-
ture set point of the boiler. This contact is on the connector
1 on terminal block X2 (230 VAC only).
4. Modulated control – Open Therm in combination with an
externally mounted simple 230 V switching time clock -
The boiler will provide room compensated heating and time
control over CH and DHW (System boiler), use options 1 & 2.

• All connections on terminal X1, X2, X4, X5, X6 and X7
are 230 VAC.
• All connections on terminal X9 are low voltage only.
2.7 Connecting external controls
• Release the two screws at the bottom of the front casing
and remove the front casing.
• Feed the cables through the grommet in the base of the
boiler.
• Connect the cables to the relevant connectors, as shown in
the diagrams.

• Isolate power supply at the fused spur before carrying out
any work on the boiler controls.
20
Sit Controls
230 V – 1ph – 50 Hz
3 s
5 s
2.5 s
5 s
3 till 10 min.
2 AT
24 VDC