Carel

IR33S0ER00

IR33 Series • Refrigeration Controller

Type Refrigeration

Application Cold Room

Probe Inputs 2

Relay Outputs 3

Communication RS485 (optional)

Panel Size 32x74 mm

R1 Compressor

R2 Defrost

R3 Fan

Universal controller for static and ventilated refrigeration units

Technical Specifications

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

Relay Outputs	3
Relay Rating	8A/250VAC (16A inrush)

Operating Temp	-10 to 60°C
Storage Temp	-20 to 70°C

Terminal	Function	Type	Wire Color
1	Power L	Input	brown
2	Power N	Input	blue
5	Probe 1 (Room)	Input	red
6	Probe Common	Input	white
7	Probe 2 (Defrost)	Input	red
10	Digital Input	Input	gray
11	DI Common	Input	gray
12	Relay 1 NO (Comp)	Output	black
13	Relay 1 COM	Output	black
14	Relay 2 NO (Defrost)	Output	orange
15	Relay 2 COM	Output	orange
16	Relay 3 NO (Fan)	Output	green
17	Relay 3 COM	Output	green

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

Code	Parameter	Range	Default	Description
St	Setpoint	-50 to 90	5 °C	Temperature setpoint
rd	Differential	0.1 to 20	2 °C	Switching differential
r1	Setpoint Low Limit	-50 to St	-50 °C	Minimum setpoint
r2	Setpoint High Limit	St to 90	50 °C	Maximum setpoint
c0	Probe 1 Offset	-10 to 10	0 °C	Room probe calibration
c1	Probe 2 Offset	-10 to 10	0 °C	Defrost probe calibration
c4	Comp ON Delay	0 to 15	0 min	Startup delay
c5	Min Comp OFF	0 to 15	3 min	Minimum off time
c6	Min Comp ON	0 to 15	0 min	Minimum on time
d0	Defrost Type	0=None, 1=Elec, 2=Gas	1	Defrost heating method
d1	Defrost End Temp	0 to 50	8 °C	Termination temperature
d2	Max Defrost Time	1 to 255	30 min	Maximum duration
d3	Defrost Interval	0 to 24	8 hr	Time between defrosts
d4	Drip Time	0 to 15	2 min	Drain time after defrost
d5	Fan Delay	0 to 15	0 min	Fan restart delay