User Manual for Danfoss ERC 111A Refrigeration Controller

Quick Guide from the Manual

The Danfoss ERC 111A is an electronic refrigeration controller designed for commercial fridges, freezers, and bottle coolers. This manual is intended for OEMs and technicians. Key operations include configuring parameters via the front panel buttons or using the KoolProg software with a KoolKey. The device supports three password-protected access levels: shop, technician, and OEM.

Product Overview

The controller features an LED display, four programmable buttons, and modular connectors. It can be mounted via front panel mounting (using a frame) or rear mounting (using clips). The device supports two temperature sensors: S1 (cabinet temperature) and S2 (defrost/evaporator temperature).

Installation and Connections

Wiring: The controller operates on 100-240 V AC. The wiring diagram includes connections for the compressor relay (DO1), cabinet temperature sensor (S1), evaporator/condenser sensor (S2), and digital input (di). Inputs are not galvanically separated; ensure cables meet reinforced insulation requirements.

Sensor Placement:

• Control Sensor: For coolers with fans, place in the return air to the evaporator. For coolers without fans, place on the side-wall, 10 cm from the back and 1/3 from the bottom.
• Condenser Sensor: Place at the liquid side of the condenser using a metal bracket or tape to ensure thermal conductivity.

Programming and Operation

Programming Tools: Configuration can be performed via the front panel buttons, KoolProg software (using KoolKey as a gateway), KoolKey as a copy key, or a Mass Programming Key (EKA 201).

Manual Operation: Use the front panel buttons to adjust set points, acknowledge alarms, or enter the menu. Accessing the menu requires holding the up/down buttons for 5 seconds and entering a password.

Info Menu: Provides access to critical data points, including highest, lowest, and average cabinet air temperatures since the last power-on, and active alarms.

Menu and Parameter Settings

The controller offers extensive parameter settings categorized by function:

• Thermostat (tHE): Set point, differential, and temperature limits.
• Pull Down (Pud): Settings for rapid cooling performance.
• Defrost (dEF): Type, intervals, duration, and termination temperature.
• Compressor (CoP): Voltage protection, error handling, and timing delays.
• Condenser (Con): Protection settings (requires condenser sensor).
• Display (diS): Intensity, units, resolution, and offsets.
• Alarm (ALA): High/low temperature alarms, delays, and buzzer duration.
• Assignments (ASi): Configuration of inputs and outputs.

Troubleshooting

If the compressor does not start, check the delay timer, line voltage, or if a defrost cycle is in progress. If the display alternates between condenser and temperature, the condenser may be too hot; clean the condenser. Error codes E01 and E02 indicate sensor failures for S1 and S2, respectively.

Technical Specifications

• Power Supply: 100-240 V AC, average 0.7 W.
• Inputs: 2 analogue (digital), user-specific assignment.
• Outputs: Compressor relay (16A resistive at 120V AC, 10A at 240V AC).
• Ingress Protection: Front IP65, Rear IP00/IP31.
• Operating Conditions: 0 to 55 °C, 93% RH non-condensing.