Danfoss ECL Comfort 310 Operating Manual page 6

Operating Guide ECL Comfort 310, application A333
If an acceptable pressure difference is not detected, the ECL
controller activates the alarm and shifts the operating command to
the opposite circulation pump.
The heating can be switched OFF automatically when the outdoor
temperature is higher than a selectable value.
The Frost protection mode maintains a selectable flow temperature,
for example 10 °C.
In case of a too low pressure, measured by S10, the refill water
function will supplement with water from a water source.
A refill pump is switched ON and the ON / OFF valve V1 opens.
The refill pumps P3 and P4 are operated alternately. One pump is
used as working pump and the other pump is used as spare pump.
The alternation time can be set as a number of days.
A solution with a single refill pump can also be selected.
In case of a too high pressure, measured by S10, the release valve
V2 (ON / OFF) will open in order to reduce the pressure.
6 | © Danfoss | 2017.09
VI.GU.T2.02