en
11
Installation
Indications,
functions and options
Messages
Commissioning
Operation and function
Arrangement 2: Solar system with heat exchange
The controller calculates the temperature difference between collector sensor S1
and store sensor S2. If the difference is larger than or identical to the adjusted
switch-on temperature difference (DT O), the solar pump will be activated by relay
1, and the store will be loaded until the switch-off temperature difference (DT F) or
the maximum store temperature (S MX) is reached.
Heat exchange from store 1 to store 2 will be operated by relay 2, if the tempera-
ture difference between sensors S3 and S4 is larger than or identical to the adjusted
switch-on temperature difference (DT3O), until the adjusted minimum (MN3O) and
maximum (MX3O) temperature thresholds of the respective stores are reached. S3
can optionally be used as the reference sensor for the store emergency shutdown
option (OSEM). If the heat quantity measurement option (OHQM) is activated, S1 or
VFD can be used for measuring the temperature (see table on p. 63).
PWM 2
PWM 1
VFD
L
N
R1
N
20
19
18
17
16
15
14
13
12
1 2
N R2
S2
S1
S3
S4 VBus
3 4 5 6 7 8 9 10
R2
S1
S3 / TSTT
S4
R1
VFD / TR
S2
Store 1
Store 2