Remeha Selecta
28
Fig. 16
External connections to terminal connector X4
Note:
All electrical connections made to the X4 connector plug must be volt free
Explanation of diagrams:
1. Time only –on/off using a simple time clock or temperature only – on/off using
a simple room stat.
2. Time and temperature – compensated using programmable modulating con-
trol.
3. Temperature only – weather compensated using an outside sensor.
4. Temperature and frost protection – on/off using a simple room and frost stat.
1. + 3. Time and temperature – simple time clock and weather compensated using
an outside sensor.
OpenTherm modulating room thermostat
2 wired on/off thermostat
Tr
Tr
mod.
outdoor sensor
To
extra frost thermostat
Tf
Tr
