Danfoss ECL Comfort 210 Operating Manual page 29

Operating Guide
2.5.3 Electrical connections, safety thermostats, 230 V a.c. or 24 V a.c.
See also the Mounting Guide (delivered with the application key)
for application specific connections.
The connection diagrams show various solutions / examples:
Safety thermostat, 1–step closing:
Motorized control valve without safety function
Safety thermostat, 1–step closing:
Motorized control valve with safety function
Safety thermostat, 2–step closing:
Motorized control valve with safety function
Danfoss District Energy
ECL Comfort 210 / 310, application A247 / A347
When ST is activated by a high temperature, the safety circuit in the
motorized control valve closes the valve immediately.
When ST1 is activated by a high temperature (the TR temperature), the
motorized control valve is closed gradually. At a higher temperature
(the ST temperature), the safety circuit in the motorized control valve
closes the valve immediately.
VI.LG.S3.02 DEN-SMT/DK 29