4.3.2 Capacity-dependent change
The lead heat exchanger is the heat exchanger which had the lowest average output capacity
over the past three days.
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Parameter
WE
Adjustment range
Führungswechsel (sequence
change) = Leistung (rating)
AUS
Outdoor temp., rating, operating hours, OFF
4.3.3 Operating hours-dependent change
The
Time interval for lag/lead sequence change
parameter determines after how many opera-
ting hours a sequence change can take place.
Parameter
WE
Adjustment range
Führungswechsel (sequence
change) = Betreib-Std (operating
hours)
AUS
Outdoor temp., rating, operating hours, OFF
Folgeumkehr-Intervall
(time interval for lag/lead se-
quence change)
168 h
1 to 999 h
4.4
Smooth start-up
The
smooth start-up
function prevents the lead heat exchanger from overheating in problematic
systems by reducing the lead heat exchanger to 50 % (control output) before activating the lag
heat exchanger.
Parameter
WE
Adjustment range
Sanftanlauf (smooth start-up) =
EIN (on)
AUS
EIN (on), AUS (off)
Folgeumkehr-Intervall
(time interval for lag/lead se-
quence change)
168 h
1 to 999 h
26
EB 5571-2 EN
Functions of the heat exchanger
