AKC 121A
AKC Series • Refrigeration Controller
Quick Info
Output Functions
Large capacity controller with 2 compressor stages
Technical Specifications
Display & Interface
| Display Type | LED |
| Display Digits | 4 |
| Buttons | 5 |
| LED Indicators | Comp1, Comp2, Defrost, Fan, Alarm |
Power Supply
| Voltage | 230V AC |
| Voltage Range | 100-240V AC |
| Frequency | 50/60Hz |
| Power Consumption | 6VA |
Sensor Inputs
| Probe Inputs | 3 |
| Probe Type | NTC 10K / PT1000 |
| Temp Range | -50 to 150°C |
| Accuracy | ±0.3°C |
Relay Outputs
| Relay Outputs | 5 |
| Relay Rating | 16A/250VAC (comp), 8A (others) |
Physical
| Panel Size | 96x96 mm |
| Depth | 70 mm |
| IP Rating | IP65 (front) |
| Weight | 200 g |
Operating Conditions
| Operating Temp | -10 to 55°C |
| Storage Temp | -25 to 70°C |
Wiring Terminals
| Terminal | Function | Type | Wire Color |
|---|---|---|---|
| L | Power L | Input |
brown
|
| N | Power N | Input |
blue
|
| S1 | Air Probe | Input |
red/white
|
| S2 | Evap Probe | Input |
red/white
|
| S3 | Aux Probe | Input |
red/white
|
| K1 | Compressor 1 | Output |
black
|
| K2 | Compressor 2 | Output |
black
|
| K3 | Defrost | Output |
black
|
| K4 | Fan | Output |
black
|
| K5 | Alarm | Output |
red
|
| LON | LON Bus | Comm |
shielded pair
|
| A/B | RS485 | Comm |
yellow/green
|
Important: Always disconnect power before wiring. Verify terminal numbers with the actual controller label before connecting.
Parameter Settings
| Code | Parameter | Range | Default | Description |
|---|---|---|---|---|
| r01 | Setpoint | -50 to 150 | -20 °C | Temperature setpoint |
| r02 | Differential | 0.1 to 20 | 2 °C | Switching band |
| r03 | Stage 2 Offset | 0 to 10 | 3 °C | Second stage start offset |
| o03 | Stage Delay | 0 to 30 | 5 min | Delay between stages |
| d01 | Defrost Type | 0-3 | 1 | 0=Off, 1=Electric, 2=Gas, 3=Off-cycle |
| d02 | Defrost Interval | 0 to 48 | 6 h | Hours between defrosts |
| d03 | Defrost Time | 1 to 180 | 60 min | Max defrost duration |
| d04 | Defrost End | -50 to 50 | 12 °C | End defrost temperature |
Error Codes
Solution: Check S1
Solution: Check S2
Solution: Check S3
Solution: Check compressors
Solution: Check staging
Solution: Check heater
Frequently Asked Questions
Stage 2 starts when temp exceeds Set+r03
Enable in o04 parameter for runtime balancing
Alternative Models (Cross Reference)
Manufacturer Information
Brand: Danfoss
Country: Denmark