SR882 operation manual
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output.
When nMIN is set as 30-90%, P1 output used as RPM
output.
When nMIN is set as 100%, it means P1 output used
as switch output.
Normal switch output: circuit pump speed control（RPM）is deactivated, pump is operated
with a fixed speed, and flow rate is not changed.
RPM control output: (speed control function is activated), the control system attempts to
maintain a constant temperature difference between collector and tank. The pump
performance is continuously adjusted, based on the temperature difference flow rate of
pump is increased or reduced.
Setup steps:
To access main menu PUMP, “PUMP” displays on the screen, press “SET” to access the
menu, then “nMIN 100” displays on screen.
►Press “SET” button, parameter “100” blinks on the
screen.
►Press “+”“-” button, to adjust pump speed.
adjustable range: (30～100%）, factory set is 100%.
►Press “ESC” button to exit the menu or wait for 20
seconds to exit automatically, parameters are saved automatically.
4.4.1 DTS Standard temperature difference for circulation pump 1 (speed adjusting)
Description:
The preset default minimum pump speed in this controller is 30%. When the switch-on
temperature difference (△TON) reaches, solar pump is triggered, and then within 10
seconds, pump speed increases to its minimum speed (30%). Thereafter, controller checks
temperature continuously, when a standard temperature difference (DTS) reaches, the
speed of pump increases one grade (10%), temperature difference RIS increases every 1
o
C,
speed of pump increases 10% until it reaches to its maximum speed 100%. Through setting
the temperature difference increase rate (RIS) can achieve the controlling of pump speed. If
temperature difference drops to the switch-off temperature difference (△T OFF), circuit
pump is ceased.
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