Connecting An On/Off Control - Room Temperature (Volt Free Switching) - REMEHA Avanta 12v Installation & Service Manual

Terminal
Block X6
L
230v - 3 Amp
N
Power Supply
E
Terminal
Block X7
1
Common Alarm
(Closes on alarm)
2
3
Terminal
Block X5
Neutral
1
Open valve to DHW (230v)
2
Open valve to HTG (230v)
3
Terminal
Block X9
Outside sensor (red band) for direct boiler weather compensation
1
or when used in conjuction with a compatable Open Therm
control eg: Chronotherm or Celcia 20
2
3
DHW sensor (red band) or volt free thermostat (make on temp fall)
Remove existing link to use this function
4
5
Exist
External interlock (volt free)
links
Remove existing link to use function
6
Modulating - using Open Therm control
7
eg: Honeywell Chronotherm or Celcia 20
On / Off - using volt free switching control
8
eg: Celcia 10 or low volt room thermostat
Terminal
Block X2
5 N
Power supply to external time clock -230v
4 L
Switch live (230v) from external time clock DHW demand
3
Remove existing link 4-3 to use this function
Exist
2
links
Switch live (230v) from external time clock HTG demand
1
Remove existing link 4-1 to use this function
NOTE: Terminal blocks are not in line as shown - diagramatic only
fig. 17 Boiler External Connection terminal details
Terminal
Block X9
1
2
3
4
5
Exist
links
6
7
Modulating - using Open Therm control
eg: Honeywell Chronotherm or Celcia 20
On / Off - using simple volt free switching control
8
fig. 18 Wiring diagram on/off control
X2
X5
X6
Boiler Run or
X7
external pump relay
(Closes on run)
X9
For external DHW priority
diverting valve on System boiler
when used in conjunction with
"Open Therm" compensation
LT.AL.W7H.000.025
X9
LT.AL.W7H.000.026
2.7.1 Connecting an on/off control – room temperature
(volt free switching)
The Remeha Avanta can be connected to a 2-wire on/off ther-
mostat, such as the Remeha Celcia 10.
Mount the thermostat in a reference room (usually the living
room).
• Remove existing link and connect the 2-wire 24 V room
thermostat to connectors 7 and 8 of the X9 terminal strip.

If a room thermostat with an anticipation resistor is being used,
parameter p5 should be changed from 0 to 1, see par.
2.10.8.
19