Neomitis SR - Safety Functions; System Cooling

SAFETY FUNCTIONS
SYSTEM COOLING
If the system cooling function is not activated (default), the solar pump is stopped once the
collector temperature (T1) reaches T1 MAX.
If the System cooling function is activated (COOL ON in the « Optional function » mode), the
solar pump will run as soon as the collector temperature reaches T1 MAX (set in the « Expert
setting » mode) in order to cool down the collector with the colder cylinder water as long as
the temperature in the cylinder does not reach T2 MAX safety limit also set in the Optional
function mode.
T2 is about to reach T2 SET temperature setpoint.
T1 reaches T1 MAX temperature limit, the solar pump starts running to cool down and
protect the collector (this will warm up the cylinder which is allowed up to T2 MAX
temperature security limit).
T2 has attained T2 MAX, the solar pump is not allowed anymore to run in order to prevent
overheating inside the cylinder.
Some hot water is drawn from the water cylinder, T2 decreases, the pump can run again
in order to cool the collector.
T2 increases to T2 MAX, again, the solar pump stops in order to protect the cylinder.
T1 exceeds T1 LIM, the controller cannot stop this progression, the expansion vessel
represents the very last protection for the collector.
At night, T1 drop below T2 (the switch-on threshold is T2-dTON), the pump runs to cool the
cylinder since T2 is above T2 SET.
T2-T1 temperature difference decreases down to dTOFF switch-off threshold, the pump
stops, etc...
0
60
T2 SET
T2 MAX
COLLECTOR
COOLING
NORMAL
OPERATION
NORMAL
OPERATION
COLL.
COOL
CYLINDER
PROTECTION
CYLINDER
PROTECTION
75
T1 LIM
T1 MAX
T1
T2
T1
T2
Temperature
SUMMER DAY COOLING SCENARIO
Time
0
DAY NIGHT
CYL.
COOL
NORM
OP.
22