SR971,SR972 Solar station operation manual
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40
seconds to exit, parameters are saved automatically.
7.7.3.1 Submenu - DTS Standard temperature difference
（
for circuit pump’s speed adjusting
）
Description:
When the switch-on temperature difference (
△
TON) reaches, solar pump is triggered, and
then within 10 seconds, pump speed reaches to its minimum speed (30%). Whereafter,
controller checks continuously, when the standard temperature difference (DTS) reaches,
the speed of pump is adjusted automatically, under the precondition that maximum flow rate
isn
’t exceeded, pump’s speed is changed slightly to keep this standard temperature
difference (DTS), and therefore to gain the maximum thermal energy. Speed adjusting of
circulation pump is based on preset maximum flow rate and standard temperature difference
( DTS). If temperature difference drops to the switch-off TD(
△
T OFF), circuit pump is
ceased.
Setup steps:
To access main menu FUN, then select submenu DTS,
“DTS 08
o
C” displays on the screen
►Press “SET” button, parameter “08
o
C
” blinks on the
screen
►Press “ ” button, to adjust standard TD,
adjustable range
（
2
o
C
～
30
o
C
）
, factory set is 08
o
C
► Press “ESC” button to exit the menu or wait for 20 seconds to exit, parameters are saved
automatically.
7.7.4 Submenu - OHQM Thermal energy measuring
Description:
Controller has function for measuring thermal energy; it can measure the energy which
from collector transfers to tank. For the sake of measuring, the temperature on flow and
return pipe should be checked, a flow meter has beed installed in solar station for
measuring the flow rate.
The thermal energy through solar system is calculated with measured parameters flow rate
and temperature on flow and return pipe ( T1,T6). Thermal energy get in the current day
