Danfoss ECL Comfort 210 Operating Manual page 10

Operating Guide ECL Comfort 210/296/310, application A237/A337
DHW (circuit 2):
By means of a week schedule, the DHW circuit can be in 'Comfort'
or 'Saving' mode. The week schedule can have up to 3 'Comfort'
periods / day. A value for the desired DHW temperature
can be set in each of the modes.
DHW charging start, DHW tank with 1 or 2 temperature sensors
When the measured DHW temperature S6 gets lower than the
charging-start temperature, the heating circulation pump P1 is
switched OFF and the DHW heating pump P2 is switched ON.
A delayed start of the DHW charging pump P4 can be arranged.
Also, it can be arranged that the start of the charging pump
depends on the DHW heating temperature. In this case, S4 must be
placed in the heat-exchanger.
The DHW heating temperature is determined by the desired DHW
temperature at S6 plus the set charging difference. The charging
temperature is typically 5 - 10 degrees higher than the desired
DHW temperature.
The return temperature S5, when the DHW heating / charging is
active, can be limited to a set value.
The DHW heating temperature at S3 is adapted to the desired DHW
charging temperature at S4. If the DHW charging temperature at
S4 cannot be reached, the ECL controller gradually increases the
desired DHW heating temperature at S3 in order to obtain the DHW
charging temperature. The ECL controller remembers the adapted
S3 temperature. A maximum temperature value can be set.
The motorized control valve M1 is controlled in order to maintain
the charging temperature at S4.
DHW charging stop, DHW tank with 1 temperature sensor
When the measured DHW temperature S6 gets higher than
the charging-stop temperature, the DHW charging pump P4 is
switched OFF. A post-run time can be set.
Charging stop, DHW tank with 2 temperature sensors
When the measured DHW temperature S6 gets 2 K higher than
the charging-start temperature AND the lower tank temperature
S8 gets higher than the charging-stop temperature, the DHW
charging pump P4 is switched OFF. A post-run time can be set.
If the installation has a changeover valve (P2 / M2), also called
priority-valve, between the heating and the DHW circuits, the
changeover valve is activated at DHW heating demand. The
circulation pump (P1) is ON when heating the DHW.
Parallel mode in two-pump applications:
If the charging temperature has a value close to the desired flow
temperature in the heating circuit, the circulation pump (P1) in the
heating circuit will not be switched OFF during DHW heating.
An anti-bacteria function is available for activation on selected
days of the week.
The DHW circulation pump (P3) has a week schedule for up to 3
ON-periods per day.
10 | © Danfoss | 2017.05
A237.2 / A337.2 example a:
A237.2 / A337.2 example b:
VI.LG.R3.02