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14 - CONECTIONS
14.1. Main control board
Analog inputs
Temperature, pressure and humidity reading sensors:
B1: return air temperature probe
B2: outdoor air temperature probe
B3: supply air temperature probe
B4: mixing air temperature probe
B5: NTC ambient air temperature probe (by default) or outdoor
air relative humidity probe (optional)
B6: low pressure transducer circuit 1
B7: high pressure transducer circuit 1
B8: suction temperature probe circuit 1
B9: low pressure transducer circuit 2 (units with 2 circuits)
B10: air quality probe or di erential air pressure sensor (optionals)
B11: suction temperature probe circuit 2 (units with 2 circuits) or
outdoor coil probe (optional in units with 1 circuit)
B12: high pressure transducer circuit 2 (units with 2 circuits)
Digital inputs
Safety devices and failure indication:
DI1: supply fan protection
DI2: smoke detector (optional)
DI3: high pressure switch circuit 1
DI4: compressor and outdoor fan protection circuit 1
DI5: safety thermistor for the electrical heater or gas burner/boiler
alarm signal (optionals)
DI6: clogged fi lter control (optional)
DI7: remote On / O
DI8: antifreeze safety for the hot water coil
DI9: high pressure switch circuit 2 (units with 2 circuits) or level
fl oat of the condensate pump (optional in units with 1 circuit)
DI10: compressor and outdoor fan protection circuit 2 (units with 2
circuits)
Analog outputs
Proportional control of the unit components and optional elements:
Y1: control of the opening of the fresh air damper (optional)
Y2: control of the 3-way valve of the hot water coil or the heat
recovery coil or proportional electrical heater or gas burner/
boiler or extraction air damper or proportional humidifi er
(optionals)
C1
NO1
NO2
NO3
C4
NO4
NO5
NO6
C8
NO8
NO9
NO10
NO11
NO12
DI1
DI2
DI3
DI4
DI5
DI6
DI7
GND
B1
B2
B3
B4
B5
B6
B7
GND
+Vdc
GND
Y1
Y2
Y3
Y4
B8
B9
B10
B11
B12
GND
DI8
DI9
DI10
GND
NO7
C7
NC7
TAM
PT
EEV1
EEV2
FieldBus1
Display port2
Ethernet
Control
Stand-by
BMS card
FieldBus2
/ BMS
+5VR GND+Vdc
Field bus
BMS
Micro
USB
Display port1
/ BMS
FieldBus2 / BMS
configuration
Graphic terminal
User
terminal
24 Vac/Vdc
L N
VBatt
GND
G
G0
“50FC”
Y3: outdoor fan circuit 1: electronic fan (standard in 50FF/FC
units) or high-speed (optional 2-speed fan in 50FF/FC units)
or plug-fan (standard in 50NC units)
Y4: outdoor fan circuit 2: electronic fan (standard in 50FF/FC
units) or high-speed (optional 2-speed fan in 50FF/FC units)
or plug-fan (standard in 50NC units)
Digital outputs
On/o control of the unit components:
NO1: compressor 1 of circuit 1
NO2: cycle reversing valve circuit 1
NO3: low-speed outdoor fan circuit 1 (optional 2-speed fan)
NO4: supply fan
NO5: 1st stage of electrical heater or gas burner/boiler (optionals)
NO6: 2nd stage of electrical heater (optional)
NO7: signal of remote general alarm or pump in the hot water coil
circuit or pump in the boiler circuit or heat recovery coil or
on-o humidifi er or rotary heat exchanger (optionals)
Note: outputs NO1 or NO4 of the expansion card c.pCOe
with address 8 can also be used to connect some of the
above optional elements.
NO8: compressor 1 of circuit 2 (units with 2 circuits)
NO9: cycle reversing valve circuit 2 (units with 2 circuits)
NO10: low-speed outdoor fan circuit 2 (optional 2-speed fan)
NO11: compressor 2 of circuit 1
NO12: compressor 2 of circuit 2 (units with 2 circuits) or condensate
pump (optional in units with 1 circuit)
Electronic expansion valves
EEV1: valve of circuit 1
EEV2: valve of circuit 2 (units with 2 circuits)
Fieldbus1
Serial connection of Uer terminal, RS485 sensors, c.pCOe expansion
cards (addresses 4, 8 and 9), SMALL board (address 11), driver
EVDEVO (address 7, 71 or 72), etc
Display port2
Connection of Graphic terminal
BMS card
Connection of the BMS communication card
Unit power supply
Power: 24 Vac
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