Operation manual of solar controller SR1568
Page 67 of 87
increase or decrease by the rise value, the pump speed will be adjusted by 10 %.
The switch-on hysteresis is -5 K.
BYPR Solar circulation bypass function
In some cases, it is good application to combine a temperature controlled bypass circuit into
the solar circuit. In the time that tank is not loaded by solar energy, this bypass circuit can
avoid water from tank flows through the solar circuit (which may lead to reduce the tank’s
temperature). This function can also be used to prevent freezing of flat plate exchanger, for
this purpose, a sensor input and output are needed to install in the system.
For example: in the morning, solar pump doesn’t run, collector is heating by solar, but there
is some cold solar liquid in the circulation pipe, in order to prevent this cold solar liquid flows
into the tank or heat exchanger, 3-ways valve will not be switched to the tank, until the
temperature difference between the inlet pipe of tank Tx and tank temperature T2 or T3 of
flat plate heat exchanger exceeds the preset switch-on temperature difference, valve just is
switched to the tank to transfer the heat from collector to tank.
Bypass circuit function needs an extra pump or valve (TYPE VALV= valve logic, TYPE
PUMP= pump logic).
Switch-on conditions:
Collector and tank meets the switch-on temperature difference（ΔT1）
When bypass temperature Tx is higher than (tank temperature +ΔT+2
o
C), 3-ways valve
will be switched to heat the tank.
When bypass temperature Tx is lower than (tank temperature +ΔT), 3-ways valve will be
switched to heat the bypass pipe.
Icon displays on the screen, it means bypass function is activated.
Icon displays on the screen, it means bypass function is in operation.
Pump logic Valve logic
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