Danfoss ECL Comfort 210 Installation Manual page 21

Installation Guide ECL Comfort 210 / 310, application A214 / A314
Heating / cooling with room temperature and air quality
control (continued)
M1 and M3 are 3-point controlled, whereas M2 is 0-10 V controlled.
For a description of alarms, compensation temperature, return
temperature limitation (S5) and frost protection (S6 and S7), please
read the section 'A214 and A314 in general' .
Danfoss District Energy
VI.GU.A2.02 DEN-SMT/DK 21