Danfoss ECL Comfort User Manual page 2

The shown diagram is a fundamental and simplified example and
does not contain all components that are necessary in a system.
If the system you are about to install differs from the shown
diagram of a standard heating system, feel free to sketch an
outline for comparison. Adaptation of systems, see section 10.
List of components:
ECL Comfort 301
S1 Outdoor temperature sensor
S2 DHW temperature sensor
S3 Flow temperature sensor, mixing circuit
S4 Return temperature sensor
S5 Flow temperature sensor
S6 Alarm input
P1 Circulation pump, heating, mixing circuit
P2 Circulation pump, heat pump
P3 Ground coil / brine pump
C1 Compressor I, heat pump
EH Electric heater
M1 Actuator, mixing valve
M2 Changeover valve