Connecting External Controls - REMEHA Avanta Plus 35c Installation And Service Manual

2
1
Manufacturer
Supply voltage
Pre-purge time
Post-purge time
Ignition time
Safety time
Anti-cycling time
Fuse value F1 (230 V)
DC fan (for 24s, 35c and 28c)
AC fan (for 39c only)
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:
On/off control – volt free 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 X9 terminal
strip (low voltage only).
Modulated control – Open Therm - The external controls will
modulate the boiler's output to achieve the flow temperature
determined by the modulating regulator. This contact is on the
X9 terminal strip (low voltage only).
On/off control – 230 V switching - The boilers internal con-
trol will modulate the output to achieve the flow temperature
set point of the boiler. This contact is on the X2 terminal strip
(230 VAC only).
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).
• 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.
LT.AL.W7H.000.024
20
Remeha Avanta Plus
Sit Controls
230 V – 1ph – 50 Hz
3 s
5 s
2.5 s
5 s
3 till 10 min.
2 AT
24 VDC
230 VAC