Connecting An External Interlock; Connecting Remote Alarm And Boiler Run Indication - REMEHA Avanta 12v Installation & Service Manual

Terminal
Block X9
1
2
3
4
5
Exist External interlock (volt free)
Remove existing link to use this function
links
6
7
8
fig. 26 Wiring diagram for an external interlock
Terminal
Block X7
1
Common Alarm
(Closes on alarm) Boiler Run or
2
external pump relay
(Closes on run)
3
fig. 27 Connecting remote alarm
X9
X7

- 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).

• 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.
• 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 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
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.
• Connect an external pump relay* to connectors 1 and 3 on
terminal X7. Contact closes on heat demand. For this pur-
pose set parameter 24 from 0 to 4.
* never connect a pump directly to connectors 1 and 3
LTALW7H000034
on terminal X7, but only via a relay.
23