Volt free contact specification: The volt free contact specification, for the outputs detailed
above, is shown below:
AC230V: 0.5A (maximum)
DC24V: 1.0A (maximum)
Input Options:
It is possible to connect inputs, using the TCB-PCMO3E option PCB’s, on the ESTIA hydro unit for the
following functions:
External room thermostat
External hot water cylinder thermostat
External STOP
External room thermostat:
The diagram above shows the thermostat connections for heating and cooling mode. The
thermostat must be manually switched between heating and cooling (the operating mode, on the
ESTIA remote controller must also be changed manually). The system cannot change between
heating and cooling modes automatically.
For cooling operation connect the cooling contact, on the thermostat, between terminals 2 (COOL) &
3 (COM) on the option PCB (as shown above).
For heating operation connect the heating contact, on the thermostat, between terminals 1 (HEAT) &
3 (COM) on the option PCB (as shown above).
Control Logic:
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