9
Connection
1：T1 temp. sensor 7：Auxi.Heating output
2：T0 temp. sensor 8：Main Power port
3：T2 temp. sensor 9：RJ45 port
4：T3 temp. sensor 10：R2 output
5：T4 temp. sensor 11：R3 output
6：T5 temp. sensor
Connect auxiliary heater wire if available:
Brown cable for the “L” line
Blue cable for “N” line
Yellow-green cable for the ground wire “G”;.
. Fault messageⅣ
Familiar problem Possible reason Solution
Pump works but no flow rate
displays. There is probably too much air
in the pipeline. Replenish heat medium
liquid and exhaust the air.
Storage reaches max. temp. When storage temperature
drops, pump starts working.
The solar system has temp.
difference but pump doesn’t
work. Solar collector reaches its max.
temp.. When collector temperature
drops, pump starts working.
Auxiliary heater is forbidden. Activate it manually.
Auxiliary heater doesn’t work. Temperature sensor has
broken circuit or short circuit. Check sensor connection
and make the wiring again.
Auxiliary heater still operates
at 23:00. Anti-bacteria function starts up.
It’s normal.
System pressure drops. There is air leakage in solar
system. Check the pipeline and
exhaust the air.
Pump works but system
doesn’t have temp. difference,
meanwhile auxiliary heater
function starts up.
Frost protection function is
activated. After collector temperature
rises, pump stops working.
The sensor display “Open” Sensor wiring is not connected
well Check resistance value,
replace sensor if necessary.
The sensor display “Short” Sensor wiring is short circuit Check resistance value,
replace sensor if necessary.
Note: Apotentially defective sensor can be checked using an ohmmeter. To do this, the sensor
must be disconnected. Its resistance value can be compared with the figures below, small
deviation is acceptable.
PT1000 resistance value
12：R4 output
Solar working station series for solar water heating control system
