Operation manual of solar controller SR1568
Page 9 of 87
thermal energy calculation.
T2～T6: NTC10K，B=3950 temperature sensor, for measuring temperature of tank and
pipe.
Communication port 485：ELA485, for remote control communication
HK-A, HK-B：Dry connection on/off signal ports, (HK and HR simultaneously open or close,
for boiler heating control)
IPWM1, IPWM2, IPWM3：Signal ports for high efficiency pump, detailed connection see
below
RPS：For Grundfos pressure sensor
VFS：For Grundfos flowmeter sensor
Advice regarding the installation of temperature sensors:
① Only original factory equipped Pt1000 temperature sensors are approved for using with
the collector, it is equipped with 1.5m silicon cable and suitable for all weather
conditions, the cable is temperature resistant up to 280oC, connect the temperature
sensors to the corresponding terminals with either polarity.
② Only original factory equipped NTC10K,B=3950 temperature sensors are approved for
using with tank and pipe, it is equipped with 3m PVC cable, and the cable is
temperature resistant up to 105
o
C, connect the temperature sensors to the
corresponding terminals with either polarity.
③ All sensor cables carry low voltage, and to avoid inductive effects, must not be laid close
to 230 volt or 400 volt cables (minimum separation of 100mm).
④ If external inductive effects are existed, e.g. from heavy current cables, overhead train
cables, transformer substations, radio and television devices, amateur radio stations,
microwave devices etc., then the cables to the sensors must be adequately shielded.
⑤ Sensor cables may be extended to a maximum length of ca. 100 meter, when cable’s
length is up to 50m, and then 0.75mm
2
cable should be used. When cable’s length is up
to 100m, and then 1.5mm
2
cables should be used.
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