26
Different modes of operation can be achieved by
determining the thermostat start temperature (coding
address "24") and stop temperature (coding address
"25"):
■
Start temperature < stop temperature:
Thermostat function e.g. for reheating.
Output
sS
is switched on when the temperature at
sensor
/
falls below the start temperature.
Output
sS
is switched off when the temperature at
sensor
/
exceeds the stop temperature.
■
Start temperature > stop temperature:
Thermostat function e.g. for utilising excess heat.
Output
sS
is switched on when the temperature at
sensor
/
exceeds the start temperature.
Output
sS
is switched off when the temperature at
sensor
/
falls below the stop temperature.
External heat exchanger
Set code/parameter "20:7" or "20:8".
%
sS
&
sF
/
Fig. 4
■
Code/parameter "20:7":
The cylinder is heated via an external heat
exchanger. Secondary pump
sS
starts in parallel with
solar circuit pump
sF
.
■
Code/parameter "20:8":
If an additional temperature sensor
/
is used, sec-
ondary pump
sS
starts if solar circuit pump
sF
is run-
ning and the required temperature differential
between sensors
%
and
/
is present.
Cylinder priority control
Set code/parameter "20:9".
In systems with 2 DHW cylinders, it is possible to set
the order in which the DHW cylinders are heated. The
order is set in coding address "26".
For this, a distinction can be drawn between operation
with and without cyclical heating (see the following
chapter).
To enable priority control, the actual temperatures of
both DHW cylinders are compared with the actual col-
lector temperature. Output
sS
will be 'live' if the secon-
dary cylinder is being heated.
Coding addresses "10", "11", "26".
Cyclical heating
Set code/parameter "20:9".
In systems with 2 DHW cylinders:
If the DHW cylinder with priority cannot be heated, the
secondary cylinder is heated for a cyclical heating time
that can be set in coding address "27".
After this time has expired, the solar control unit
checks the rise in collector temperature during a cycli-
cal pause time that can be set in coding address "28".
As soon as the start conditions for the cylinder with pri-
ority are met, that cylinder is heated again. Otherwise,
the secondary cylinder continues to be heated.
Coding addresses "26", "27", "28".
Function description – version with SM1
Version with SM1 and KM-BUS (solar DHW heating)
(cont.)
6131981
Appendix
