Honeywell

DC1020

DC1000 Series • Refrigeration Controller

Type Refrigeration

Application Cold Room

Probe Inputs 1

Relay Outputs 2

Communication RS485 Modbus

Panel Size 48x48 mm

R1 Control

R2 Alarm

Enhanced 1/16 DIN controller with dual display

Technical Specifications

Relay Outputs	2
Relay Rating	3A/250VAC

Operating Temp	0 to 50°C
Storage Temp	-20 to 70°C

Terminal	Function	Type	Wire Color
L	Power L	Input	brown
N	Power N	Input	blue
1	Sensor +	Input	red
2	Sensor -	Input	white
3	Shield/3-wire	Input	green
R1	Relay 1 (Ctrl)	Output	black
R2	Relay 2 (Alarm)	Output	red
A	RS485 A	Comm	blue
B	RS485 B	Comm	yellow

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

Code	Parameter	Range	Default	Description
SP	Setpoint	Per sensor	25 °C	Temperature setpoint
Hb	Hysteresis	0.1 to 999.9	2 °C	On/Off differential
InP	Input Type	0-12	1	Sensor selection
Ctrl	Control Mode	0=Off, 1=PID, 2=On/Off	1	Control type
Pb	Prop Band	0.1 to 999.9	20 °C	PID P
Ti	Integral	0 to 9999	300 s	PID I
Td	Derivative	0 to 9999	60 s	PID D
At	Auto-tune	0=Off, 1=On	0	PID auto-tuning
AL1	Alarm 1	Per sensor	50 °C	High alarm
AL2	Alarm 2	Per sensor	0 °C	Low alarm
Adr	Modbus Address	1 to 247	1	Network address