Evco

EVKB21N7

EVKB 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

Advanced controller with buzzer and RS485 communication

Technical Specifications

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

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	Input	yellow/white
5-6	Probe 2	Input	green/white
7-8	Probe 3	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	1	Defrost method
dI	Defrost Interval	0 to 99	8 hr	Defrost interval
dL	Defrost Duration	0 to 240	30 min	Max defrost time
Ad	Address	1 to 247	1	Modbus address
bd	Baud Rate	0=9600,1=19200,2=38400	0	Communication speed