Manual of SR258 intelligent controller
16
Note:
The Sign represents whether timing heating function is on or off.
1. Within the preset time section, heating sign is lighted on the screen
2. Out of the preset time section, heating sign doesn’t display on the screen.
6.3 CIRC DHW circulation pump controlled by temperature or by time
Function description:
This controller provides an output for running DHW circulation pump, which can be controlled
by a temperature, at this case, an extra circuit pump (connect to the output R2 option) and an
extra temperature sensor installed on the hot water return pipe (connect to the input T4)
should be installed in the system. When the temperature of DHW return is lower than the
preset switch-on temperature, circuit pump is triggered, until temperature rises up to the
switch-off temperature, pump is stopped.
2 controlling modes are designed for running DHW circulation pump.
Time controlled DHW pump within the preset 3 time sections (default Mode)
Within the preset time section, when running of the DHW circulation pump R2 is controlled by
time, at this case, pump is triggered by time, as default set, pump R2 runs for 3 minutes
(adjustable range 1-30 minutes) and then ceases for 15 minutes (adjustable range 0-60
minutes), same process repeated within the preset time section.
Note:
if the ceased time (CYCF) is set to 0 minute,
it means within this time section, circuit pump keeps
running without any stop.
Default time section setup:
The first time section: start at 05:00, stop at 7:00
The second time section: start at 11:00, stop at 13:00
The third time section: start at 17:00, stop at 22:00
Temperature controlled DHW pump within the
preset 3 time sections
within the preset time section, when running of the DHW
circulation pump is controlled by temperature, as default
set, pump R2 is triggered when return temperature T4 is
below 40
o
C, and it is stopped when T4 rises up to 45
o
C,
There is a precondition for triggering the DHW circuit
pump (set in submenu STAT):
