22
Remeha Avanta 18v
LTALW7H000031b
X9
Terminal
Block X9
DHW sensor (red band) or volt free thermostat (make on temp fall)
Remove existing link to use this function
1
2
3
4
5
6
7
8
Exist
links
59970LTGBW7H041a
Terminal
Block X5
X5
1
Neutral
2
Open valve to DHW (230v)
3
Open valve to HTG (230v)
For external DHW priority
diverting valve on System boiler
when used in conjunction with
"Open Therm" compensation
LTALW7H000032b
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
2.7.6 Connecting the DHW sensor/thermostat
•
If an external DHW calorifier is being used with the Avanta
18v system boiler a DHW control sensor or volt-free ther-
mostat can be connected to connectors 3 and 4 of the X9
terminal strip after removing the existing link. The control
will automatically detect whether a sensor or a thermostat
has been connected.
LTALW7H000031
2.7.7 Connecting a three-way valve
If required a 230 V three-way valve can be connected to ter-
minal X5 of the control unit. When used in conjunction with
an “Open Therm” compensator the DHW-production operates
with priority. Connector X5-1 for N (neutral), connector X5-2 for
”open valve to DHW” (port A of three-way valve) and connec-
tor X5-3 for “ open valve to CH (port B of three-way valve)
The cable must be fed through the boiler’s casing by means
of the supplied cable gland
and run trough the cable clamp on
the right-hand inside of the boiler.
59970LTGBW7H041
LTALW7H000032
2.7.8 Connecting a frost thermostat
The boiler must be installed in a frost-free area to prevent the
condensate drain from freezing. However if the temperature of
the CH water in the boiler drops too low, the integrated boiler
protection device is activated as follows:
- at a water temperature below 7°C: the circulation pump is
switched on;
- at a water temperature below 3°C: the boiler is switched on;
- when the water temperature is above 10°C: the boiler is
switched off and the circulation pump runs for another 15
minutes.
- A frost thermostat should preferably be installed in rooms
with a high frost risk.
- Connect the frost thermostat in parallel to the room
thermostat - connectors 7 and 8 of the X9 terminal strip
(remove existing link between connectors 7 and 8 before
use).
