Honeywell

UDC3500

UDC3000 Series • Refrigeration Controller

Type Refrigeration

Application Cold Room

Probe Inputs 2

Relay Outputs 3

Communication RS485 Modbus / Ethernet (optional)

Panel Size 96x96 mm

R1 Control 1

R2 Control 2

R3 Alarm

Advanced 1/4 DIN controller with profiling capability

Technical Specifications

Relay Outputs	3
Relay Rating	5A/250VAC

Operating Temp	0 to 55°C
Storage Temp	-40 to 85°C

Terminal	Function	Type	Wire Color
L	Power L	Input	brown
N	Power N	Input	blue
1	Input 1 +	Input	red
2	Input 1 -	Input	white
3	Input 2 +	Input	red
4	Input 2 -	Input	white
O1	Output 1	Output	black
O2	Output 2	Output	blue
O3	Output 3	Output	red
AO	Analog Out	Output	yellow
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
SP1	Setpoint 1	Per input	25 °C	Primary setpoint
SP2	Setpoint 2	Per input	0 °C	Secondary setpoint
In1	Input 1 Type	0-25	5	Sensor 1 selection
In2	Input 2 Type	0-25	0	Sensor 2 selection
Pb1	Prop Band 1	0 to 9999	50	PID 1 P
rSt1	Reset 1	0 to 9999	10	PID 1 I
rAt1	Rate 1	0 to 10	0 min	PID 1 D
PrG	Program	0-8	0	Profile program
SEGS	Segments	1 to 32	8	Profile segments
Addr	Address	1 to 247	1	Modbus address