23
LTALW7H000033c
X9
Terminal
Block X9
External interlock (volt free)
Remove existing link to use this function
1
2
3
4
5
6
7
8
Exist
links
LTALW7H000034c
X7
Terminal
Block X7
1
2
Common Alarm
(Closes on alarm)
Boiler Run
(Closes on run)
3
•
The integrated boiler protection described above will not
provide complete system or fabric protection.
•
When a Celcia 20 control has been fitted to connectors 7
and 8 on X9 (
see par. 2.7.4
) an outside sensor as detailed
in par. 2.7.5
) must be used to provide system and building
fabric frost protection. I
•
If a frost thermostat is connected parallel to the Celcia on
connectors 7 and 8 on X9, when the frost thermostat calls
for heat (contact closed) it will override the Celcia 20
control and cause an error message (OT ERROR) flashes
in the display and the boiler will operate continuously to
achieve the flow set point.
2.7.9 Connecting an external interlock
The Remeha Avanta 18v is supplied with an external interlock
function. A volt free switching device (i.e. external gas pres-
sure switch, safety thermostat for under floor heating) can be
connected to connectors 5 and 6 of the X9 terminal strip after
removing the existing link. When this circuit is open the boiler
will shut down with the display showing (code
9
) and will
restart when the circuit is closed.
LTALW7H000033
LTALW7H000034
2.7.10 Connecting remote alarm and boiler run indication
As standard the boiler is supplied with 3 volt free connectors
on terminal X7. They can be used for an external gas valve,
remote alarm and boiler run indication.
•
Common alarm signal connect to connectors 1 and 2 on
terminal X7. Contact closes on lock out. For this purpose set
parameter
24
from
0
to
1
.
•
Boiler run signal connect to connectors 1 and 3 on terminal
X7. Contact closes on heat demand. For this purpose set
parameter
24
from
0
to
2
.
•
Connect an external gas valve to connectors 1 and 3 on
terminal X7. Contact closes when the gas valve is activated.
For this purpose set parameter
24
from
0
to
3
.
