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The solar circuit pump does not work, although the
collector is considerably warmer than the tank.
Operating control lamp of the controller illumi-
nated?
yes
There is no current; check
fuses / replace them and
check power supply.
Does the pump start up in manual operation?
no
The adjusted temperature dif-
ference for starting the pump
is too high; choose a value
which makes more sense.
Is the pump current enabled by the controller?
no
Is the pump stuck?
a
68
a
no
yes
yes
yes
b
b
Turn the pump shaft using a
screwdriver; now passable?
no
Pump is defective
- replace it.
Controller might
be defective
- replace it.
10
Accessories
10.1
Sensors and measuring instruments
Temperature sensors
The product range includes high-precision platinum
temperature sensors and cylindrical clip-on sensors.
V40 flowmeter kit
The V40 is a measuring instrument for detecting the
flow of water or water / glycol mixtures. After a spe-
cific volume has passed, the V40 reed switch sends
an energy to the meter. The heat quantity used is
calculated by the calorimeter using these impulses and
the measured temperature difference with the help
of pre-defined parameters (glycol type, concentration,
heat capacity, etc.). The kit includes the V40 flowmeter,
2 temperature sensors and 2 sensorwells ( ½" NPT ).
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