Manual of SR288 intelligent controller
33
Note:
1. PMP2 setting process is same like PMP1
2. Only 1 type can be selected from 5 types ONOF
、
PLUS
、
PSOL
、
PHEA
、
0-10V
Example: when “PLUS ON” open option is selected, then other four types are closed
automatically.
7.5 COOL Cooling function
Function description:
There are 3 cooling functions can be activated for 3 different devices: system cooling, tank
cooling, heat transferring by external radiator.
OSYC System cooling
The system cooling function aims to keep the lifetime of a solar system for a longer time. The
function overrides the maximum tank temperature limitation to provide thermal relief of the
collector field and the heat transfer fluid on hot days. If the tank temperature is higher than
the adjusted maximum tank temperature and the switch-on temperature difference
DTCO
is
reached, the solar pump remains running or will be switched on. Solar loading is continued
until either the temperature difference falls below the adjusted switch-off value
DTCF
or the
collector emergency shutdown temperature
OCEM
is reached.
Note:
This function will only be available when the collector cooling function, external
radiator heat transfer functions are not activated.
OSTC Tank cooling
When the tank cooling function is activated, the controller aims to cool down the tank during
the night in order to prepare it for solar loading on the following day. If the tank temperature
exceeds the adjusted maximum tank temperature SMAX, the collector temperature falls
below the tank temperature and down to the switch-on temperature difference DTCO of this
cooling function, then system will be activated in order to cool down the tank by releasing the
energy through the collector.
If tank cooling function is activated, sign blinks on the screen
Note:
if tank temperature reaches to 95
o
C, all cooling functions will be locked.