MENU > Settings > Return limit
High limit Y2 (return temp. limitation, high limit, Y-axis)
1x034
Set the return temperature limitation referring to the outdoor temperature
value set in 'Low T out X2'.
See Appendix “Parameter ID overview”
The corresponding X coordinate is set in 'Low T out X2'.
MENU > Settings > Return limit
Infl. - max. (return temp. limitation - max. influence)
1x035
Determines how much the desired flow temperature will be influenced if the
return temperature is higher than the calculated limit.
See Appendix “Parameter ID overview”
Influence higher than 0:
The desired flow temperature is increased, when the return
temperature gets higher than the calculated limit.
Influence lower than 0:
The desired flow temperature is decreased, when the return
temperature gets higher than the calculated limit.
X
= Return temperature
# 1 #
= Limitation temperature
# 2 #
= Negative influence (1x035) when return temp. gets higher than
limit. temp.
# 3 #
= Negative influence (1x036) when return temp. gets lower than
limit. temp.
# 4 #
= Positive influence (1x036) when return temp. gets lower than limit.
temp.
# 5 #
= Positive influence (1x035) when return temp. gets higher than
limit. temp.
If the ‘Infl.’ factor is too high and / or the ‘Adapt. time’ too low, there is
a risk of unstable control.
Example
The return limit is active above 50 °C.
The influence is set to -2.0.
The actual return temperature is 2 degrees too high.
Result:
The desired flow temperature is changed by -2.0 x 2 = -4.0 degrees.
Normally, this setting is lower than 0 in district heating systems to
avoid a too high return temperature.
Typically, this setting is 0 in boiler systems because a higher return
temperature is acceptable (see also 'Infl. - min.').
VI.GU.T2.02
© Danfoss | 2017.09 | 77
Operating Guide ECL Comfort 310, application A333
