Change In Lag/Lead Sequence; Outdoor-Temperature-Dependent Change - Samson TROVIS 5500 Operating Instructions Manual

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:
Outdoor temperature <
Folgeumkehr-GW ta
(reverse sequence limit
ta)
Outdoor temperature >
Folgeumkehr-GW ta
(reverse sequence limit
ta)
2
[Übersicht > Parameter > Allgemein > Folgebetrieb]
Parameters
Führungswechsel (sequence
change) = Außentemp. (outdoor
temp.)
Folgeumkehr-GW ta
(reverse sequence limit ta)
Rating = 20 kW
WT1
Lead
WE
AUS
15 °C
Functions of the heat exchanger
Rating = 50 kW
WT2
Adjustment range
Outdoor temp., rating, operating hours, OFF
–40 to 50 °C
Rating = 60 kW
WT3
Lead
EB 5571-2 EN
25