Danfoss ECL Comfort 296 Operating Manual

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Danfoss ECL Comfort 296 Operating Manual Manual pdf 5 page image

2.0 Installation2.1 Before you startTheapplicationA267isveryflexible. Thesearethebasicprinciples:Heating (circuit 1):Typically, the flow temperature is adjusted according to yourrequirements. The flow temperature sensor S3 is the mostimportant sensor. The desired flow temperature at S3 is calculatedin the ECL controller, based on the outdoor temperature (S1).The lower the outdoor temperature, the higher the desired flowtemperature. By means of a week schedule (up to 3 ‘Comfort’periods / day), the heating circuit 1 can be in ‘Comfort’ or‘Saving’ mode (two different temperature values for desired roomtemperature).The motorized control valve M1 is opened gradually when theflow temperature is lower than the desired flow temperature andvice versa.The return temperature (S5) to the district heating supply shouldnotbetoohigh. Ifso,thedesiredflowtemperaturecanbeadjusted(typically to a lower value), thus resulting in a gradual closing of themotorized control valve.Furthermore, the return temperature limitation can dependon the outdoor temperature. Typically, the lower the outdoortemperature, the higher the accepted return temperature.In boiler-based heating supply the return temperature should notbe too low (same adjustment procedure as above).If the measured room temperature (S7) does not equal the desiredroom temperature, the desired flow temperature can be adjusted.The circulation pump (P1) is ON at heat demand or at frostprotection. The circulation pump (P1) can be switched OFFwhen heating the DHW (dependent priority). If the system hasa changeover valve (P2) between the heating and DHW heatingcircuit, the circulation pump (P1) is ON when heating the DHW.The heating can be switched OFF when the outdoor temperature ishigher than a selectable value.Typical A267 application:Theshowndiagramisafundamentalandsimplifiedexampleanddoesnot contain all components that are necessary in a system.All named components are connected to the ECL Comfort controller.List of components:S1 Outdoor temperature sensorS2 Returntemperaturesensor, circuit2S3 Flowtemperaturesensor, circuit1S4 Flowtemperaturesensor, circuit2S5 Returntemperaturesensor, circuit1S6 DHWtanktemperaturesensor, upperS7 Roomtemperaturesensor,circuits1and2S8 DHWtanktemperaturesensor, lowerP1 Circulationpump, heating, circuit1P2 DHW heating pump, circuit 3P3 DHW circulation pump, circuit 3P4 Circulationpump, heating, circuit2M1 Motorizedcontrolvalve,circuits1and3M2 Motorized control valve, circuit 2VI.GU.G2.02 © Danfoss | 2018.01 | 5Operating Guide ECL Comfort 210 / 296, application A267