Function check
6 720 645 504 (2011/04) en
103
19.4 Operating temperatures
Check the temperatures in the heat carrier and collector
circuit after 10 minutes of operation:
• Temperature difference between heating system flow
and return approx. 7 ... 10 K.
• Temperature difference between collector circuit in
and out approx. 2 ... 5 K, recommendation: 2 ... 3 K.
When the temperature difference is too small:
B Reduce the speed of the corresponding circulation
pump (G2 or G3) in order to obtain a lower flow.
When the temperature difference is too great:
B Increase the speed of the corresponding circulation
pump (G2) in order to obtain a greater flow.
Fig. 55
P2 Heat carrier pump G2
P3 Collector circuit pump G3
t
SA
Temperature collector circuit out T11
t
SE
Temperature collector circuit in T10
t
HV
Temperature heat transfer fluid out T8
t
HR
Temperature heat transfer fluid in T9
0 K
10 K
7 K
6 K
9 K
P2
P2
P2
t
HV
- t
HR
3 K
5 K
2 K
P3
P3
P3
P3 ( )
P2 ( )
P2 ( )
t
SE
- t
SA
6 720 612 299-04.3O
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