38 DKDHR
VI.GP.V2.02
Danfoss District Energy
Instructions
Akva Lux II VX
16.2 Troubleshooting - Domestic hot water
Problem
Possible cause
Solution
No domestic hot water
Defective or wrongly set differential
pressure controller.
(Akva Lux II VX3-E)
Check the functions of the differential
pressure controller - clean valve seat and
capillary tubes if required, - air and rinse
capillary tubes.
Strainer on DH supply clogged.
Clean strainer.
Defective actuator - or possibly dirt in
the valve housing.
Check the functions of the actuator -
clean valve seat if required.
Automatic controls wrongly set or defec-
tive - possibly power failure.
Check if the setting of the controller is
correct, - see separate instructions.
Check the power supply;
Temporary setting of actuator to “manu-
al” control - see instructions on heating
circuit, manual control.
Calified plate heat exchanger.
Clean plate heat exchanger with acid
solution or replace plate heat exchanger.
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 dur-
ing 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 defec-
tive.
Check if the setting of the controller is
correct, - see separate instructions.
Variations in temperature
Non-return valve on the circulation line
defective (leads to mixing - the circula-
tion water pipes become cold during
tapping).
Replace non-return valve.
