22
Note
Function description when using the SDIO/SM1A elec-
tronics module in conjunction with PlusBus (plug
jF
),
see from page 28.
Solar DHW heating
The solar circuit pump starts according to the following
criteria, resulting in the DHW being heated.
■
The temperature differential between the collector
temperature and the cylinder temperature is greater
than the start temperature differential set in coding
address "00".
■
The minimum collector temperature set in coding
address "12" is exceeded.
The solar circuit pump is switched off according to the
following criteria:
■
The temperature differential between the cylinder
temperature and the collector temperature is smaller
than the stop temperature differential set in coding
address "01".
■
The maximum cylinder temperature (set DHW tem-
perature) set in coding address "08" is exceeded.
■
The maximum collector temperature set in coding
address "09" is exceeded.
■
The temperature set at the high limit safety cut-out (if
installed) is exceeded.
Variable speed solar circuit pump
The speed control is activated in coding address "02".
It can only be activated for relay output
sF
.
Suitable pumps:
■
Multi-stage solar circuit pump
■
Pumps with PWM input (only use solar circuit
pumps)
Variable speed control
The speed of the solar circuit pump is controlled by
means of the temperature differential between the col-
lector temperature and the cylinder temperature (cod-
ing address "03").
Note
Recommendation: Operate the solar circuit pump at
max. speed while the solar thermal system is being
vented.
Function description – version with SM1
Version with SM1 and KM-BUS (solar DHW heating)
6131981
Appendix
