Emerson/Alco

EC3-X32

EC3 Series • Refrigeration Controller

Type Refrigeration

Application Cold Room

Probe Inputs 3

Relay Outputs 4

Communication RS485 Modbus RTU

Panel Size 32x74 mm

R1 Compressor

R2 Defrost

R3 Fan

R4 Alarm

Universal electronic controller for refrigeration with EEV capability

Technical Specifications

Display Type	LED
Display Digits	3
Buttons	4
LED Indicators	Compressor, Defrost, Fan, Alarm

Relay Outputs	4
Relay Rating	8A/250VAC (Comp 16A)

Operating Temp	-10 to 55°C
Storage Temp	-25 to 65°C

Terminal	Function	Type	Wire Color
1	Power L	Input	brown
2	Power N	Input	blue
3-4	Probe 1 (Room)	Input	yellow/white
5-6	Probe 2 (Evap)	Input	green/white
7-8	Probe 3 (Aux)	Input	orange/white
9	RS485 A+	Comm	orange
10	RS485 B-	Comm	yellow
11-12	Compressor	Output	black
13-14	Defrost	Output	red
15-16	Fan	Output	blue
17-18	Alarm	Output	gray

Important: Always disconnect power before wiring. Verify terminal numbers with the actual controller label before connecting.

Code	Parameter	Range	Default	Description
SP	Setpoint	-50 to 99	-18 °C	Temperature setpoint
dF	Differential	0.1 to 20	2 °C	Switching differential
dT	Defrost Type	0=Off,1=Elec,2=Gas,3=Timer	1	Defrost method
dI	Defrost Interval	0 to 99	8 hr	Defrost interval
dL	Defrost Duration	0 to 240	30 min	Max defrost time
dE	Defrost End	-50 to 50	8 °C	End defrost temperature
Fd	Fan Delay	0 to 30	3 min	Fan delay after defrost
Ad	Address	1 to 247	1	Modbus address