Input / Output Option PCB’s – Installation
Output Options:
It is possible to connect to outputs, using the TCB-PCIN3E option PCB’s, on the ESTIA hydro unit for the
following functions:
Alarm output
Boiler output
Defrost
Compressor ON
System alarm & boiler outputs:
Alarm output (L1): Output ON when the system is in alarm/fault conditions. The output is
available through a volt free contact on the TCB-PCIN3E option PCB.
Boiler control output (L2): Output ON when outdoor ambient temperature is less than or equal
to the temperature set in FC23. The output is available through a volt free contact on the TCB-
PCIN3E option PCB.
Defrost & compressor ON outputs:
Defrost output (L1): Output ON when the system / outdoor unit is under defrost control. The
output is available through a volt free contact on the TCB-PCIN3E option PCB.
Compressor ON output (L2): Output ON when the outdoor unit compressor is operating. The
output is available through a volt free contact on the TCB-PCIN3E option PCB.
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