SR882 operation manual
~ 25 ~
Factory set
: the switch-on temperature of temperature controlled DHW pump function is
40
o
C
，
the Switch-off temperature is 45
o
C,
Condition for triggering hot water circulation pump
: only when tank temperature T3 is
2
o
C higher than the required hot water temperature, hot water circulation pump just can be
triggered.
Description of time controlled DHW pump:
DHW pump can also be controlled at the pre-set time sections, this function needs an extra
DHW pump (connect output port P2), this pump will be triggered timing, and within a running
time section, default operation is pump runs for 3 minutes, then stops for 15 minutes, the
process repeats within the time section.
Default time sections:
The first time section: pump works at 05:00 and stops at 07:00.
The second time section: pump works at 11:00 and stops at 13:00.
The third time section: pump works at 17:00 and stops at 22:00.
If user wants to switch-off any time section, then just set the start time and close time with a
same time. i.e. starts at 05:00 and close also at 05:00.
Note:
Temperature controlled DHW function is prior to time controlled DHW function.
When T4 is installed on the return pipe of hot water, controller will automatically turn-off
the time controlled function, inverse to use temperature controlled DHW function.
In order to avoid large measuring error, the sensor T4 on hot water return pipe should
be installed 1.5m far away from tank at least.
