KT-Elektronik SOL3-3, Инструкция по установке и эксплуатации, Страница: 47 / 88

KT-Elektronik SOL3-3
5.14 Auxiliary heating with secondary heat generator
An additional heat generator is required in several systems where a solar fraction of
100% can't be expected. The secondary heat generator may be an oil or gas boiler, an
electric cartridge heater or a district heating network.
Scheduled time ranges to hold a specific stand-by temperature can be set for nominal
(day-time) and reduced (night-time) operating mode.
Once the temperature falls below the programmed set-point for the storage tank, the
secondary heat generator is activated and remains active until the temperature at the
storage tank sensor SF1 reaches the set-point again.
The setting 'Offset with CP On' can be used to specify that the auxiliary heating is only
turned on if the storage temperature is considerably too low (e.g. 20K), in cases where
one of the collector pumps CP1/CP2 is running. Hereby it is possible to use an
energetically more favourable heat source with just a slight impairment of comfort. The
collector circuit has no impact on auxiliary heating if this parameter is set to 0K (default
factory setting).
Secondary heat generators allow thermal disinfection.
Setting FS Value range Description
Day-time
storage tank
set-point 45 °C 5 to 90 °C Storage tank temperature set-point
for nominal operating mode (day-time)
Night-time
storage tank
set-point 10 °C 5 to 90 °C Storage tank temperature set-point
for reduced operating mode (night-time)
Hysteresis 5 K 0 to 30 K Hysteresis for storage tank temperature
Offset with
CP On 0 K 0 to 20 K Auxiliary heating delay temperature difference
with running collector pump
5.15 Raise return flow of external heating system
A considerable interest of solar thermal systems is designed not with solar cash ratio of
100%, but the solar thermal is of 'only' a secondary energy source. Hence, it makes
sense to create the possibility for the typical boiler heating systems, to offer a heating
support about a heating circuit flow temperature increase.
EB_37383_SOL3-3_EN002
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