Samson TROVIS 5571 - Change in Lag;Lead Sequence; Outdoor-Temperature-Dependent Change

4.3 Change in lag/lead sequence
The lag/lead sequence can be changed depending on the outdoor temperature, operating
hours or output capacity. The change in lag/lead sequence is only effective when the setting
'Führungstauscher' (lead heat exchanger) is set to 'Auto'. See section 1.5.
4.3.1 Outdoor-temperature-dependent change
The outdoor-temperature-dependent change in lag/lead sequence is only appropriate when
heat exchangers with varying output capacities are used.
The lead heat exchanger is determined by the Reverse sequence limit ta parameter. When out
-
door temperatures are above this limit, the smaller heat exchanger leads. Whereas when the
outdoor temperatures are below the limit, the larger heat exchanger leads.
To prevent a lag/lead sequence change when the outdoor temperature fluctuates briefly, the
mean outdoor temperature is calculated over three days.
Example:
Rating
WT1
= 20 kW Rating
WT2
= 50 kW Rating
WT3
= 60 kW
Outdoor temperature <
Folgeumkehr-GW ta
(reverse sequence limit
ta)
Lead
Outdoor temperature >
Folgeumkehr-GW ta
(reverse sequence limit
ta)
Lead
2
[Übersicht > Parameter > Allgemein > Folgebetrieb]
Parameters WE Adjustment range
Führungswechsel (sequence
change) = Außentemp. (outdoor
temp.)
AUS Outdoor temp., rating, operating hours, OFF
Folgeumkehr-GW ta
(reverse sequence limit ta)
15 °C –40 to 50 °C
EB 5571-2 EN 25
Functions of the heat exchanger