A.O. Smith Theta T Series Installation, User And Service Manual page 78

3.6.7.
3.6.8
78
Installation-, User- and Service Manual
Connecting room thermostat
Note
A room thermostat must always be connected to the dual service system. Otherwise the
dual service system and heating system will not function.
The room thermostat must always be an ON/OFF thermostat or an Switched Live-
thermostat (SWL). An OpenTherm or other thermostat does not work in combination with
the Theta dual service module.
Possibility 1 : ON/OFF-thermostat
The ON/OFF-thermostat (2-wire connection, a 24 V signal is standard supplied by the
Theta Dual Service Module) is part of the heating system. You must connect this valve to
the controller.
Terminal Type
1 -
J3
3 -
Note
Fit cables in the strain relief.
Possibility 2 : SWL-thermostat
The SWL-thermostat (1-wire connection, a 230 V
Theta Dual Service Module) is part of the heating system. You must connect this valve to
the controller.
Terminal Type
4 -
Note
Fit cables in the strain relief.
Connecting communication cable (only BFC)
Note
The communication cable must always be connected, otherwise neither the water heater
nor dual service controller will run.
Terminal Type
1 -
J16
2 -
Colour Description
- Room thermostat
- Room thermostat
signal is standard supplied by the
AC
Colour Description
- SWL-signal of SWL-thermostat
IMD-1120 R0.0
Colour Description
BUS-link (to terminal 23 on the connection
black
strip of the water heater)
BUS-link (to terminal 24 on the connection
black
strip of the water heater)