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Operating guide
7.0 Troubleshooting
7.1 Troubleshooting in general
In the event of operating disturbances, the following basic features
should be checked before carrying out actual troubleshooting:
•
the substation is connected to electricity,
•
the strainer on the DH supply pipe is clean,
•
the supply temperature of the DH is at the normal level
(summer, at least 60 °C - winter, at least 70 °C),
•
the differential pressure is equal to or higher than the normal
(local) differential pressure in the DH network – if in doubt, ask
the DH plant supervisor,
•
pressure on the system - check the HE pressure gauge.
7.2 Troubleshooting DHW
Problem
Too little or no DHW.
Hot water in some taps but not in all.
Tap temperature too high; DHW tap load
too high.
Temperature drop during tapping.
Thermostatic control valve does not close
12
DEN-GT
Termix One Solar
Possible cause
Strainer in supply or return line clogged.
DHW circulation pump out of order or with
too low setting.
Defective or clogged non-return valve.
No electricity.
Wrong setting of automatic controls, if any.
Scaling of the plate heat exchanger.
Defective motorized valve.
Defective temperature sensors.
Defective controller.
DCW is being mixed with the DHW, e.g. in
a defective thermostatic mixing valve.
Defective or clogged non-return valve on
circulation valve.
Thermostatic valve adjusted to a too high
level.
Scaling of the plate heat exchanger.
Larger DHW flow than the substation has
been designed for.
Temperature difference between DH
supply and DHW set point too low.
VI.CW.K4.02 / LUK38004
Authorized personnel only
Assembly, start-up and maintenance work must be performed by
qualified and authorized personnel only.
Solution
Clean strainer(s).
Check circulation pump.
Replace – clean.
Check.
To adjust an electronic controller for
DHW, pls. note enclosed instructions for
electronic controller.
Replace – rinse out.
Check (use manual function) – replace.
Check – replace.
Check – replace.
Check – replace.
Replace – clean.
Check – set.
Replace – rinse out.
Reduce DHW flow.
Lower the set point temperature or
increase the DH supply temperature.
Danfoss District Energy
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