Danfoss District Energy
DSA 1 MINI -
16 DEN-SMT/PL
VM.HE.B2.02
Danfoss District Energy
Troubleshooting
Problem
Possible cause
Solution
Not enough pressure on the hot water
Strainer in cold water meter clogged.
Clean strainer - possibly in consultation
with the water supply company.
Long waiting time
Circulation pump out of operation
Check whether the pump is running -
whether the pump is receiving power.
Control that there is no air in the pump
housing - see pump manual.
Temperature too low
See “No domestic hot water”.
See “No domestic hot water”.
Non - return valve on the circulation line
defective (leads to mixing - and the
circulation water pipes become cold
during tapping).
Replace non - return valve.
Temperature too high
Defective actuator - possibly dirt in the
valve housing.
Check the functions of the actuator -
clean valve seat if required.
Automatic controls wrongly set or
defective.
Check if the setting of the controller is
correct, - see separate instructions.
Defective immersion sensor.
Replace immersion sensor.
Variations in temperature
Non - return valve on the circulation line
defective (leads to mixing - and the
circulation water pipes become cold
during tapping).
Replace non - return valve.
Delcining temperature during tapping
Defective or wrongly set differential
pressure controller (set too low).
Check the functions of the differential
pressure controller - clean valve seat and
capillary tubes if required, - air and rinse
capillary tubes.
Automatic controls wrongly set.
Check that the controller has been
correctly set - see separate instructions.
Immersion sensor placed incorrectly.
Place immersion sensor correctly in
accordance with the manufacturer
instructions for the cylinder.
You may contact Danfoss Redan A/S for
further information.
Calified heating element.
Clean DHW cylinder with acid solution or
replace heating element.
Poor cooling
Calified heating element.
Clean DHW cylinder with acid solution or
replace heating element.
You may check the specifications of the
manufacturer conc. cylinder capacity.
