21
LTALW7H000028b
X9
Terminal
Block X9
Modulating - using Open Therm control
eg: Honeywell Chronotherm or Celcia 20
On / Off - using simple volt free switching control
1
2
3
4
5
6
7
8
Exist
links
LTALW7H000029d
X9
Terminal
Block X9
Outside sensor (red band) for direct boiler weather compensation
or when used in conjuction with a compatable Open Therm
control eg: Chronotherm or Celcia 20
1
2
3
4
5
6
7
8
Exist
links
20
40
60
75
0
10
20
-15
Factory setting
LTALW7H000030a
2.7.4 Connecting a modulating control – room or outside
compensation
The Remeha Avanta 18v has an OpenTherm
®
interface. This
enables our modulating range of OpenTherm
®
room controls
(e.g. the Remeha Celcia 15 or 20) to be connected without
any further modifications.
•
Mount the control in a reference room (usually the living
room).
•
Remove existing link and connect the two-wire interface
cables to connectors 7 and 8 of the X9 terminal strip.
•
When using the Celcia 20 it is possible to add an outside
sensor to provide weather compensation with room adjust-
ment. Connect the outside sensor to connectors 1 and 2 on
the X9 terminal strip.
If the DHW water temperature on the OpenTherm
®
control can
be adjusted, then the Remeha Avanta 18v will supply water
at the temperature determined at the OpenTherm
®
with the
maximum being set in the boiler. OpenTherm
®
is an industry
standard modulating control available from several control
manufacturers.
The Remeha Avanta 18v
can therefore be controlled directly
by any other controls with this OpenTherm
®
logo
2.7.5 Connecting an outside temperature sensor
An outside temperature sensor can be connected to connec-
tors 1 and 2 of the X9 terminal strip.
The boiler will regulate the output using the set point of the
internal heat curve.
This can be set as follows:
- Outside temperature minimum set point = -15°C (adjustable
with parameter
p29
to between 0 and -30°C)
- Outside temperature maximum set point = 20°C
(adjustable with parameter
p28
to between 0 and 40°C)
- Flow temperature set point at maximum outside tempera-
ture = 20°C (adjustable with parameter
p27
to between
0 and 60°C)
- Flow temperature set point at minimum outside temperature
= 20°C (adjustable with parameter
p1
to between
20 and 85°C)
An outside sensor used in conjunction with a simple 230 V
time clock will provide easy to set up and operate - timed
weather compensation heating based on the above graph.
LTALW7H000028
LTALW7H000029
LTALW7H000030
