Operation Manual

7
ORT-10
Wiring
NLNLGB
Important - To avoid damage to Boiler and Thermostat, connect
only to OpenTherm connections on boiler, do not connect to any
other power source.
By connecting a volt free switch over terminals 3 + 4 you can provide
an external override to enable a forced 8°C frost protection + HW
store o condition.
A
B
O
O
OpenTherm
connections
in ORT- 10
Wires can be
crossed
OpenTherm
connections
in boiler
3
4
Set-back
connections
in ORT-10
External volt
free
contactor/
switch