IR33V7HR20
IR33 Series • Refrigeration Controller
Quick Info
Output Functions
Controller optimized for ventilated refrigeration units
Technical Specifications
Display & Interface
| Display Type | LED |
| Display Digits | 3 |
| Buttons | 4 |
| LED Indicators | Compressor, Defrost, Fan, Alarm, Light |
Power Supply
| Voltage | 230V AC |
| Voltage Range | 115-230V AC |
| Frequency | 50/60Hz |
| Power Consumption | 6VA |
Sensor Inputs
| Probe Inputs | 3 |
| Probe Type | NTC |
| Temp Range | -50 to 90°C |
| Accuracy | ±0.5°C |
Relay Outputs
| Relay Outputs | 4 |
| Relay Rating | 8A/250VAC |
Physical
| Panel Size | 32x74 mm |
| Depth | 65 mm |
| IP Rating | IP65 (front) |
| Weight | 120 g |
Operating Conditions
| Operating Temp | -10 to 60°C |
| Storage Temp | -20 to 70°C |
Wiring Terminals
| Terminal | Function | Type | Wire Color |
|---|---|---|---|
| 1 | Power L | Input |
brown
|
| 2 | Power N | Input |
blue
|
| 5 | Probe 1 (Air) | Input |
red
|
| 6 | Probe Common | Input |
white
|
| 7 | Probe 2 (Evap) | Input |
red
|
| 8 | Probe 3 (Product) | Input |
red
|
| DI1 | Door Switch | Input |
gray
|
| DI2 | Night Mode | Input |
gray
|
| K1 | Relay 1 (Comp) | Output |
black
|
| K2 | Relay 2 (Def) | Output |
orange
|
| K3 | Relay 3 (Fan) | Output |
green
|
| K4 | Relay 4 (Light) | Output |
yellow
|
Important: Always disconnect power before wiring. Verify terminal numbers with the actual controller label before connecting.
Parameter Settings
| Code | Parameter | Range | Default | Description |
|---|---|---|---|---|
| St | Setpoint | -50 to 90 | 2 °C | Temperature setpoint |
| S2 | Night Setpoint | -50 to 90 | 0 °C | Night setback |
| rd | Differential | 0.1 to 20 | 2 °C | Switching differential |
| d0 | Defrost Type | 0-3 | 1 | Defrost method |
| d1 | Defrost End | 0 to 50 | 6 °C | Termination temp |
| d2 | Max Defrost | 1 to 255 | 30 min | Maximum duration |
| d3 | Defrost Interval | 0 to 24 | 6 hr | Time between |
| L0 | Light Mode | 0=Off, 1=On, 2=Sched | 2 | Light control |
| L1 | Light On | 00:00-23:59 | 08:00 | Light on time |
| L2 | Light Off | 00:00-23:59 | 22:00 | Light off time |
Error Codes
Solution: Check probe 1
Solution: Check probe 2
Solution: Check probe 3
Solution: Check system
Solution: Check settings
Solution: Close door
Frequently Asked Questions
Configure DI2 for night mode and set S2 parameter
Set L0=2, then L1 for on time and L2 for off time
Alternative Models (Cross Reference)
Manufacturer Information
Brand: Carel
Country: Italy