13
• the overall length of the geothermal heat collector
• the inner diameter of the geothermal heat collector
• the composition of the liquid mixture
• the temperature of the liquid mixture
Caution
Calculation and adjustment has to be done by a local installer.
Adjust the pump according to the geothermal heat exchanger size to ensure ideal mode of operation.
• The flow rate of the pump must be 6-7 l per minute for GEO 300.
• The flow rate of the pump must be 9-10 l per minute for GEO 500.
6.4.1
Control modes and functions
General indicator
LED is lit up in green in normal operation
LED lights up/flashes in case of a fault
LED
Problem
Cause
Solution
Lights up red
Blockage
Rotor is blocked
Start the manual restart or
contact customer service.
Motor winding
Winding is defective
Flashes red
Undervoltage or
overvoltage
Mains power supply is too
low or high
Measure the mains voltage
and examine operating
conditions. Request
customer service.
Excessive module
temperature
Module interior is too
warm
Short-circuit
Motor current is too high
Flashes red and green
Faulty generator operation
Water is flowing through
the pump hydraulics but
there is no mains voltage
at the pump
Measure the mains
voltage, make sure the
amount of mixture and the
system pressure are
correct.
Make sure ambient
conditions are within
allowed range.
Dry run
Air in the pump
Overload
Sluggish motor, pump is
operated outside of its
specifications. The speed is
lower than during normal
operation
Active control mode indicators:
Variable differential pressure Δp-v
Constant differential pressure Δp-c
Constant speed
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