Operation manual of solar water controller SR868C8/SR868C8Q
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Port 3: connect black wire ( GND)
Note: please lead wire into indoors, and fix the cable outdoors.
Sensor input ports
Input sensor ports T0, T1: for Pt1000 sensors, used for measuring the temperature of
collector and measuring the heat output.
Input sensor ports T2, T3, and T4: for NTC10K, B=3950 sensors, used for measuring
the temperature of tank and pipe.
Advice regarding the installation of temperature sensors:
Only original factory equipped Pt1000 temperature sensors are approved for use with
the collector, it is equipped with 1.5meter silicon cable and suitable for all weather
conditions, the temperature sensor and cable are temperature resistant up to 280℃,
not necessary to distinguish the positive and negative polarity of the sensor connection.
Only original factory equipped NTC10K,B=3950 temperature sensors are approved for
use with tank and pipe, it is equipped with 1.5meter PVC cable, and they are
temperature resistant up to 105℃, not necessary to distinguish the positive and
negative polarity of the sensor connection.
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)
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.
Sensor cables may be extended to a maximum length of ca. 100 meter, when cable’s
length is up to 50m, and then 0.75mm2 cable should be used. When cable’s length is up
to 100m, and then 1.5mm2 cable should be used.
Output ports
Output P1：For solar circuit pump, semiconductor relay (SCR relay), also suitable for
RMP control, max. switching current 1A,
Output P2：for hot water circuit pump, electromagnetic relay, and max. switching
current 3.5A,
P2 ports are always open,
Output R1：for by-pass circuit pump or valve, electromagnetic relay, max. switching
current 3.5A, R1 ports are always open,
