Key Technical Specifications
- Product Type: Electronic medium temperature controller
- Order Code: 084B7060
- Control Method: PID regulation with adaptive function
- Temperature Accuracy: ±0.25°C or better after transient phenomena
- Digital Inputs: ON/OFF input for ICS/PM start-stop or forced ICM shutdown
- Relay Outputs: Fan relay output + solenoid valve relay output
- Analog I/O: Analog input (replaceable temperature reference) + analog output (temperature-proportional signal)
- Alarm Function: High/low temperature alarm with configurable limits
- P0 Feature: Evaporation temperature limiting (P0 limit)
- Communication: Data interface compatible with ADAP-KOOL system for PC monitoring and data collection
- System Compatibility: PM3 main valves with CVQ pilot valve; EVM-NC required if fail-closed valve behavior is needed
- Typical Applications: Cold rooms (fruit/food storage), industrial process cooling, food industry refrigeration, liquid cooling systems
Product Introduction
The Danfoss EKC 361 (order code 084B7060) is an electronic medium temperature controller designed for industrial and commercial refrigeration systems. It provides PID-regulated temperature control with adaptive response to transient events, maintaining temperature within ±0.25°C after disturbances. The controller interfaces with PM3 main valves via CVQ pilot valves and supports ADAP-KOOL network communication for remote monitoring.What separates the EKC 361 from basic on/off controllers is its PID loop with adaptive tuning — it manages rapid load changes without overshoot or oscillation. The unit also provides analog output proportional to measured temperature, making it usable as a display signal source for SCADA or BMS integration. Fan and solenoid relay outputs are included as standard, reducing the need for external switching hardware.
Installation & Configuration Guide
Preparation — 10 min
- Disconnect power to the refrigeration system and lock out/tag out.
- Record the existing controller’s parameter settings (setpoint, alarm limits, PID values, defrost schedule).
- Identify sensor type (NTC/PTC/PT1000) and wiring configuration.
- Verify the PM3 main valve size and CVQ pilot valve installation.
- Prepare replacement sensors, wiring, and mounting hardware.
Removal — 5–10 min
- Label all sensor and relay wiring before disconnecting.
- Photograph the terminal layout and DIP switch settings (if applicable).
- Disconnect sensor cables, relay outputs, analog I/O, and communication lines.
- Remove the old EKC 361 from its DIN rail or panel mount.
Installation — 10 min
- Mount the replacement EKC 361 in the same position.
- Connect temperature sensor(s) to the correct input terminals — verify sensor type matches controller configuration.
- Wire fan relay and solenoid valve relay outputs to field devices.
- Connect analog input/output if used for setpoint override or monitoring.
- Connect ADAP-KOOL communication cable if networked.
Power-On & Test — 10 min
- Restore power and check for display initialization.
- Verify displayed temperature matches an independent reference thermometer.
- Confirm setpoint, alarm limits, and PID parameters match the original configuration.
- Test relay outputs by forcing a temperature deviation (e.g., warm the sensor briefly).
- Verify fan starts/stops correctly and solenoid valve responds to controller commands.
- Check ADAP-KOOL communication if connected to a PC or supervisory system.
Troubleshooting Quick Reference
| Symptom | Most Likely Cause | First Check |
|---|---|---|
| No display | Power supply failure or blown fuse | Measure supply voltage at controller terminals |
| Incorrect temperature reading | Wrong sensor type selected or open sensor circuit | Verify sensor type parameter and measure sensor resistance |
| Temperature oscillation | PID parameters too aggressive or sensor placement issue | Check PID tuning values and sensor mounting location |
| Fan relay not switching | Wrong output assignment or relay failure | Check relay output configuration and measure output voltage |
| Valve does not close on power loss | Missing EVM-NC fail-closed pilot valve | Confirm system requires fail-closed; add EVM-NC if needed |
| Communication failure | Wrong baud rate or cable fault | Verify ADAP-KOOL settings and check cable continuity |
| Alarm not clearing | Alarm limit too tight or sensor fault | Check alarm hysteresis and verify sensor reading |
Dimensions, Mounting & Wiring Notes
- Mounting: DIN rail or panel mount (verify from physical unit)
- Sensor Inputs: Typically NTC or PTC; confirm sensor type from existing installation
- Relay Outputs: Fan relay + solenoid valve relay (check current ratings on nameplate)
- Analog I/O: Analog input for setpoint override; analog output for temperature display signal
- Communication: ADAP-KOOL compatible data interface
- Wiring Note: Keep sensor cables separated from power cables to avoid noise interference. Use shielded cables for analog signals.
FAQ
Is the EKC 361 suitable for low-temperature freezers?
It is classified as a medium temperature controller. For low-temperature applications (below approximately -25°C), verify the sensor range and controller specifications — a different EKC model may be required.Can I use any NTC sensor with the EKC 361?
No. The sensor type (resistance curve, e.g., NTC 10k, PTC 1000, PT1000) must match the controller’s configured input type. Using the wrong sensor will give incorrect temperature readings.I’m replacing an old EKC 361. Do I need to reconfigure everything?
Yes. Record all parameters from the old unit before removal — setpoint, alarm limits, PID values, defrost settings, and sensor type. The replacement will need the same configuration.What happens to the PM3 valve when power is lost?
By default, the PM3 main valve opens fully on power loss. If your system requires the valve to close on power loss, you must add a normally closed solenoid pilot valve (EVM-NC).Can I monitor this controller remotely?
Yes, through the ADAP-KOOL communication interface. It connects to Danfoss ADAP-KOOL controllers or a PC for monitoring, data logging, and parameter adjustment.Is this controller still manufactured by Danfoss?
The EKC 361 (084B7060) has been widely used in the field. Confirm current production status and availability with Danfoss or an authorized distributor before specifying it for new installations.
