KT-Elektronik SOL3-3, Installation And Owner'S Manual, Page: 48 / 88

Installation and operating manual KT-Elektronik
5.15.1 Main principle
A boiler or an other heat source is a primary energy
source for heating circle and domestic hot water
preparation. This primary energy source works self-
sufficiently, therefore the compact solar controller
SOL3-7 has no influence on their function.
The heating circuit return flow is equipped with the
sensor RüF. An switching valve RUV enables to
route the heating circuit return flow through the solar
warmed up storage tank.
The switching valve RUV becomes active if the
storage tank temperature SF1 exceeds the heating
circuit return flow temperature (RüF) at least a
adjusted value return temperature increase offset.
If the heating circuit pump UP is active, the heating
circuit return flow is warmed up, so that less energy
must be supplied by the primary energy generator.
5.15.2 Implementation
The range of the function described in chapter Temperature difference controller (page
52) is not active after reset to factory default settings resp. Setting the system variant ID.
The return flow temperature sensor RüF is realised with the terminal number 2 which
was shown for heating circuit flow temperature sensor, because without heating circuit
the heating circuit flow temperature sensor has no function. The storage tank
temperature sensor SF1 (terminal number 7) will be used with no modification.
The switching valve RUV is realised with binary output DO 5 on terminal number 27
(UP). On the display the switching valve RUV is shown in the control circuit 1 with the
symbol 'mixing valve up' , not as a heating circuit circulation pump.
In the settings level CO3 is to adjust the return flow temperature increase offset as
Temperature difference set point. The hysteresis is fixed to +/- 2 K and is not adjustable.
The functionality raise return flow is not prevented about usage schedule, summer
operating mode or other functions.
The state of the binary output to control the switching valve RUV (named TdS) can be
changed in the manual operating mode.
Functions FS Configuration
Temperature difference control
(TDR) 0 CO3 -> F10 – 0 Off (1 On)
Function block parameter FS Range
Temperature difference set point
10K -30...+160 °C
Reference input
2 Terminal number 1...9
Controlled input
7 Terminal number 1...9
48
EB_37383_SOL3-3_EN002