SR971,SR972 Solar station operation manual
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23
7.3 Main menu - THET Timing heating
Function description:
Electrical heater, gas boiler or oil boiler can be integrated into solar system used as back-up
of system, and they can be triggered automatically at preset time by preset temperature.
Within a preset time section, when the temperature (T3) in top of tank drops below the preset
switching-on temperature of this function, back-up heating starts to work, when T3 rises up
to the preset turning off temperature, back-up heating is stopped. Within 24 hours, three
time sections can be set with this controller.
Factory set:
The first time section: back-up heating function starts at 4:00 and ends at 5:00 am. Within
this time section, the switch-on temperature is 40
o
C, switch-off temperature is 45
o
C.
The second time section: from 10:00 to 10:00 am, it means there is no back-up heating in
this time.
The third time section: back-up heating function starts at 17:00 and ends at 22:00 pm.
Within this time section, the switch-on temperature is 50
o
C, switch-off temperature is 55
o
C.
The switch-on temperature adjustable range:
3
℃～
(OFF-2
℃
)
The switch-off temperature adjustable range: (ON+2
o
C) ~ 80
o
C
If you want to shut off one timing heating, then you can set the turning on time and turning off
time same value ( for example, the second time section no this function, then you can set
turning on/off time is 10:00 ~ 10:00)
When time is outside of the preset time section, back-
up heating doesn’t work automatically
even when the tank temperature reaches the switch
–on temperature of heating.
Note:
When there is no sensor installed in the top of tank (no T3 sensor), controller will take
the signal of T2 (sensor in bottom of tank) automatically to control this function.
The time in this controller is 24 hours, when you set time section, the switch-off time of
heating should be later than switch-on time. For example: if you set the switch-on time
of heating is at 17:00, but switch-
off time of heating is 6:00, then this setting doesn’t
