KT-Elektronik SOL3-3, Installation And Owner'S Manual, Page: 46 / 88

Installation and operating manual KT-Elektronik
Setting FS Value range Description
Array minimum
running time
PA3 60 s 0...1800 s Minimum running time for array before
switching
5.13 External heat exchanger
When operating installations with system separation of collector and storage tank, an
external heat exchanger may be installed. An additional exchanger pump CTP is
required in this case.
Turn-on condition: The start of the exchanger pump CTP is delayed by the setting 'turn-
on delay CTP', if the temperature difference between collector and storage still matches
the turn-on condition after one of the collector pumps CP1/CP2 have been turned on. If
the temperature difference drops below the turn-on condition after the collector pump
CP1 or CP2 has been turned on, the exchanger pump is not turned on.
Turn-off condition: The exchanger pump CTP is turned off with a defined delay 'CTP
post-run time' once the turn-off condition for the collector pump CP1 or CP2 has been
reached.
The turn-on delay and the post-run time depend on the system (pipe length, flow rate,
exchanger capacity).
Setting FS Value range Description
Turn-on delay CTP 120 s 0 to 250 s Turn-on delay for the collector exchanger
pump CTP
Post-run time CTP 10 s 0 to 250 s Post-run time for the collector exchanger
pump CTP
An optional collector flow temperature sensor CVF located in the collector circuit may be
used to reduce the turn-on delay and the post-run time in order to increase the efficiency
of the solar system. The exchanger pump CTP is turned on once the collector flow
sensor has reached the turn-on condition (temperature difference between collector flow
and storage tank) and one of the collector pumps CP1/CP2 is running.
Function FS Description
CVF for CTP
CO3 -> F09- 1 0 Collector flow temperature sensor CVF for heat
exchanger pump CTP active
CO3 -> F07 – 1 - (CVF) required
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EB_37383_SOL3-3_EN002