Danfoss ECL weather controllers - a practical guide for users and installers
Danfoss ECL weather controllers - a practical guide for users and installers
Weather controllers are devices that automatically adjust the supply temperature of the heating system to changing external conditions. Their main goal is to improve thermal comfort and increase energy efficiency. In practice, this means lower heating bills and more stable room temperatures.
Why use weather control?
Studies show that a properly configured weather controller can result in energy savings of up to 10-15% in single-family homes, and in some cases even more. For larger facilities or district heating systems, the savings can be even greater. These controllers adjust the supply temperature according to the outside temperature and the programmed schedule.
Danfoss ECL Comfort - what they are?
Series Danfoss ECL Comfort includes electronic controllers with weather functions, designed for central heating, cooling, DHW and district heating systems. The ECL 110, 210, 296 and 310 models are available, with the ECL 210 and 310 being the most versatile and extensive solutions.
- ECL 210 - Supports up to 3 circuits, can work with application key, compatible with ECA 30/31 remote panel.
- ECL 310 - more advanced, supports up to 4 circuits, has built-in Ethernet, Modbus, M-bus communication and the ability to work with Danfoss Leanheat Monitor.
The most common questions and answers
1. What are ECL application keys and are they required?
Yes, the application key is an essential part of the configuration. Each key contains a specific application (e.g., DHW heating, mixing system, etc.).), which is loaded into the ECL Comfort controller. This allows the device to be quickly adapted to a specific installation without programming.
One key can be used multiple times - it can be removed and the settings copied to subsequent controllers, which is especially convenient for serial installations.
2. Whether a mounting base is needed?
ECL Comfort controllers can be wall-mounted or DIN-rail mounted. Versions marked "B" (e.g., ECL 210B, ECL 310B) do not have a dial or display - they require connection of an external control panel ECA 30 or ECA 31. In this case, mounting in the control cabinet is standard and does not require an additional base, unless provided for in the installation design.
3. What voltage and equipment variants are available?
The regulators come in versions:
- 24V AC - most commonly used in multi-family buildings, transformer-powered systems.
- 230V AC - Convenient to install directly into the power grid, popular in single-family homes.
- With or without display (variant B) - versions without display are operated via remote panel ECA 30/31.
4. How the ECA 30/31 remote control panel works?
The ECA panel makes it convenient to control the ECL controller from anywhere - it can be installed in the living room or technical room. The ECA 30 model has a built-in room temperature sensor, while the ECA 31 additionally measures humidity. Both panels connect to the controller via the ECL 485 bus (power and communication via a single wire).
5. Are extensions possible?
Yes. With the ECL 310, it is possible to use the ECA 32/35 module, which adds analog inputs and outputs and allows actuators to be controlled by a 0-10V signal. The controller can also interface with a SCADA system and be part of a larger monitoring network via Danfoss Leanheat Monitor.
6. Whether the device will remember the settings after a power loss?
Yes. All application parameters are stored in the controller's memory. Short-term power interruption does not cause loss of settings.
7. What additional functions ECL offers?
- Protection against freezing and overheating
- Daily and holiday schedules
- Function to turn off heating in summer
- Data logging and event log
- Ability to operate in master and slave mode
How to choose the right ECL controller?
| Model | Number of circuits | Communications | Application support | Extensions |
|---|---|---|---|---|
| ECL Comfort 210 | up to 3 | ECL 485 | a2xx keys | ECA 30/31 panel |
| ECL Comfort 310 | up to 4 | Ethernet, Modbus, M-bus | a2xx and A3xx keys | ECA 32/35, Leanheat Monitor |
Summary
Danfoss ECL Comfort weather controllers are advanced yet user-friendly devices. Thanks to their modular design (application keys, remote panels, extensions), they are easy to adapt to a specific system - whether in a single-family home or a large district heating facility.
If you need help choosing the right model or application key - contact our technical department.
