Operating Instructions
µC3 control
This control unit is specially programmed to control air-water
chillers and heat pumps with four capacity stages. These
are distributed in two independent cooling circuits with two
tandems that act upon a common water circuit. Both systems
have two fans each, with speeds controlled by pressure sen-
sors. This control unit operates by means of the following
intakes and outlets.
Digital inputs
Digital outputs
Analogical inputs
Analogical outputs
ID1 - J1/8 General protection (PG)
ID2 - J1/1 Flow switch (FS)
ID3 - J1/9 Remote ON/OFF (ROO)
ID4 - J1/2 Pump 1 protector (Q5)
ID5 - J1/10 Low pressure switch, circuit 1 (LP1)
ID6 - J4/8 High pressure switch, circuit 1 (HP1)
ID7 - J4/1 Thermal protection, compressor 1 (THPC1)
ID8 - J4/9 Thermal protection, compressor 2 (THPC2)
ID9 - J4/2 Thermal protection, fans circuit 1 (THPF 1-2)
ID10 - J4/10 Low pressure switch, circuit 2 (LP2)
ID11 - J7/6 High pressure switch, circuit 2 (HP2)
ID12 - J7/1 Thermal protection, compressor 3 (THPC3)
ID13 - J7/8 Thermal protection, compressor 4 (THPC4)
ID14 - J7/3 Thermal protection, fans circuit 2 (THPF 3-4)
ID15 - J7/9 Remote COOL/HEAT (RCH)
ID18 - J7/5 Pump 2 protector (Q6)
N01/C1-2 Compressor 1, circuit 1 (K1)
N02/C1-2 Compressor 2, circuit 1 (K2)
N05/C5 Pump 1
N06/C6-7 Compressor 3, circuit 2 (K3)
N07/C6-7 Compressor 4, circuit 2 (K4)
N08/C8-9 Pump 2
N010/C10 Alarm
N011/C11-12 Antifreeze heater, circuit 1-2
N012/C11-12 Backup heater
N013/C13-14 4-way valve, circuit 1 (V4V1)
N014/C13-14 4-way valve, circuit 2 (V4V2)
B3 - J2 Coil pressure, circuit 1
B4 - J3 Coil pressure, circuit 2
B5 - J4/13 Water temperature at exchanger intake
B6 - J4/12 Water temperature at exchanger outlet
Y3 Fan speed control, circuit 1 (PWM)
Y4 Fan speed control, circuit 2 (PWM)
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