ECL Comfort 210/310, A275/A375 Installation Guide - Danfoss ...

Installation Guide ECL Comfort 210 / 310, application A275 / A375
6.3 Room limit
This section is only relevant if you have installed a room
temperature sensor or a Remote Control Unit.
The controller adjusts the desired flow temperature to compensate
for the difference between the desired and the actual room
temperature.
If the room temperature is higher than the desired value, the
desired flow temperature can be reduced.
The 'Infl. -max.' (Influence, max. room temp.) determines how
much the desired flow temperature should be reduced.
Use this influence type to avoid a too high room temperature. The
controller will allow for free heat gains, i.e. solar radiation or heat
from a fire place etc.
If the room temperature is lower than the desired value, the desired
flow temperature can be increased.
The 'Infl. -min.' (Influence, min. room temperature) determines
how much the desired flow temperature should be increased.
Use this influence type to avoid a too low room temperature. This
could e.g. be caused by windy surroundings.
A typical setting will be -4.0 for 'Infl. -max.' and 4.0 for 'Infl. -min.'
Infl. - max. (room temp. limitation, max.) 12182
Circuit Setting range Factory setting
2 -9.9 ... 0.0 -4.0
Determines how much the desired flow temperature will be influenced
(decreased) if the actual room temperature is higher than the desired room
temperature (P control).
-9.9: The room temperature has a big influence.
0.0: The room temperature has no influence.
Influence
‘Infl. - min.’ (min. limitation)
Desired room temperature
Actual room temperature
‘Infl. - max.’ (max. limitation)
The ‘Infl. - max.’ and 'Infl. - min.' determine how much the room
temperature should influence the desired flow temperature.
If the ‘Infl.’ factor is too high and / or the ‘Adapt. time’ too low, there is
a risk of unstable control.
Example 1:
The actual room temperature is 2 degrees too high.
The ‘Infl. - max.’ is set to -4.0.
The ‘Infl. - min.’ is set to 0.0.
The slope is 1.8 (see 'Heat curve' in 'Flow temperature').
Result:
The desired flow temperature is changed by (2 x -4.0 x 1.8)
–14.4 degrees.
Example 2:
The actual room temperature is 3 degrees too low.
The ‘Infl. - max.’ is set to -4.0.
The ‘Infl. - min.’ is set to 2.0.
The slope is 1.8 (see 'Heat curve' in 'Flow temperature').
Result:
The desired flow temperature is changed by (3 x 2.0 x 1.8)
10.8 degrees.
Danfoss District Energy VI.GU.L1.02 DEN-SMT/DK 127