District Heating

District Heating

Is delivered by Egedal Fjernvarme

change list

1. Mounted Danfoss Icon on 3D printed brackets
2. Changed the way the tube for overflow was mounted. Now it has a free fall
3. Changed the pump setting to Auto Constant Flow - this is the recommended setting from Grundfoss
4. Added an Ethernet connection so that Danfoss Leanhead.com can be used to see remote data
5. Added a 2-wire between my Danfoss Icon Floor Heating Controller can put the Heat Exchance Unit in "Sleep Mode" by connecting a Potential Free connection to the ECL-120 Controller

Termix Distric Heating Unit

Termix 
Product Sheet: https://www.egedalfjernvarme.dk/media/16563/termix_vvx_tpv_iso_ecl_prodark_lq.pdf

Danfoss TPV regulator

https://termix.dk/produkt/termix-tpv-regulator/

Heat Exchanger Control Unit

Type ECL 120 
Serial Number: 0032900AF2509
Quick Guide: https://termix.dk/wp-content/uploads/2023/06/Termix-Kvikguide-ECL-120-LDK36133.pdf

Grundfos UPM3-pump

Type: UPM3 Auto
Model: 15-70 130 ZZZ

Konstant tryk" er som navnet siger en reguleringsform hvor trykket over pumpen holdes konstant, således at hvis der er stort forbrug i anlægget, så falder trykket over pumpen som så reagerer ved at skrue op for hastigheden, og modsat hvis forbruget falder. Pumpen tilpasser altså hastigheden (og dermed strømforbruget) til det aktuelle behov.

"Proportional tryk" er lidt mere "kryptisk", man kan sige at trykket ikke holdes konstant men derimod holdes lavt ved lille flow og stiger med stigende flow. Herudover er funktionen egentlig den samme som ved "konstant tryk", men det svarer altså til at man "skruer ned" for det ønskede tryk når der køres langsomt og "skruer op" for det ønskede tryk når der køres hurtigere. Egentlig kunne man selv stå ved en "konstant tryk" pumpe og "lege" "proportional tryk" styring, ved at justere det ønskede tryk op og ned i takt med flowet i anlægget.

Source: http://www.stokerforum.dk/index.php?topic=5817.0

YouTube video of 4 ways to control a pump: https://youtu.be/5tAWJeyd2Gg?si=xX5kKnIFnFlVkl3N

Xylem note: https://www.xylem.com/en-ca/support/case-studies-white-papers/how-to-choose-the-correct-speed-control-for-heating-systems/

Termix ECL Webpage

The controller can be connected to the internet via a LAN cable 
Create a user at the Danfoss Leanhead Portal (link) and login: https://app.lhm.danfoss.com/

Termix ECL App

Can be found in Apple App-store: https://apps.apple.com/dk/app/termix-ecl/id1631972147?l=da

Export 13-04-2025

Controlling the Heat Exchange Unit from Danfoss Icon Floor Heating Controller

To allow the Floor Heating System to be able to put the Heat Exchange Unit to Sleep when no rooms/zones is asking for heat. And to stop unnecessary energy to be lost by having the pump in the Heat Exchanger and Floor Heating system. The Icon Controller can ask to stop these and put them into Energy Saving Mode. To do this the Floor Heating system pump is connected to a Relay output on the Icon controller. Another relay switch can be used to tell the Heat Exchanger to stop when no zones is asking for heat.

To make this possible you both have to wire this and set this up in the ECL-120 controller using the App from a Bluetooth connection. You have to setup the input as: "Sparedrift I overstyringstilstand afbrudt tilstand"

See below image from my App setup:

When the ECL-120 input is in open mode (no connection from the relay output from the Icon Controller) then the ECL-120 unit goes into Power Saving mode.

See the result here where the Icon Controller is in OPEN mode. You here see the "Moon" symbol is active. The Heat Exchanger is in saving mode.