Danfoss ECL Application Key A266
- Compatibility: ECL Comfort 310 only (087H3040, 087H3106)
- Schematic: 2 heating loops + DHW
- Installation: plugs into controller slot (no wiring)
- Languages: multilingual interface
Applications
Multi-unit residential substations with two heating loops (e.g. radiator + underfloor) and DHW preparation via a plate heat exchanger. The key sets up the controller menu and I/O channels according to the Danfoss standard A266 schematic — commissioning is limited to setpoint tuning.
Technical specifications
| Parameter | Value |
|---|---|
| Code | 087H3800 |
| Type | ECL Application Key A266 |
| Compatibility | ECL Comfort 310 (087H3040, 087H3106) |
| Schematic | 2 heating loops + DHW |
| Language support | Multilingual (LT / EN / RU / PL / DE etc.) |
Notes for the designer
A266 works only in ECL 310. ECL 210 requires A2xx keys (A214, A217, A230). Match the key against the project schematic before ordering. Delivery across the EU.
When to choose A266
- Two independent heating loops (radiator + underfloor)
- DHW preparation via a heat exchanger
- Standard multi-unit substation with DH connection
B2B delivery and logistics
- Delivery across the EU (from warehouse in Vilnius, LT)
- Competitive B2B pricing
- 30-day payment terms for companies (per contract)
- Free consultation on key selection based on project schematic
Official Danfoss catalog: store.danfoss.com/087H3800
FAQ
Can I replace the key in an installed controller?
Yes. Power off the controller, remove the old key, insert the new one. On power-up the controller reconfigures itself for the new application.
A266 vs A260 — differences?
A266 covers two heating loops and DHW. A260 covers two heating loops without DHW (or with a simpler DHW variant). See the Danfoss application manual for exact schematics.
Does the interface support English?
Yes. ECL Comfort supports multilingual interface including English.
