Troubleshooting - Domestic Hot Water - Danfoss VX Solo HWS Instructions For Installation And Use Manual

Instructions for installation and use

13.2 Troubleshooting - Domestic hot water

Problem
No domestic hot water
Long waiting time
Temperature too low
Temperature too high
Variations in temperature
Danfoss District Energy
VX Solo HWS substations
Possible cause
Defective or wrongly set differential
pressure controller.
Strainer on DH supply clogged.
Defective actuator - or possibly dirt in
the valve housing.
Automatic controls wrongly set or defec-
tive - possibly power failure.
Calified heating element.
Inadequate cylinder capacity.
Circulation pump out of operation.
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).
Defective actuator - possibly dirt in the
valve housing.
Automatic controls wrongly set or defec-
tive.
Defective immersion sensor.
Non-return valve on the circulation line
defective (leads to mixing - and the
circulation water pipes become cold dur-
ing tapping).
VI.HE.M1.02
Solution
Check the functions of the differential
pressure controller - clean valve seat and
capillary tubes if required, - air and rinse
capillary tubes.
Clean strainer.
Check the functions of the actuator -
clean valve seat if required.
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.
Clean DHW cylinder with acid solution or
replace heating element.
Wait for heating / loading of the cylinder.
You may check the specifications of the
manufacturer conc. cylinder capacity.
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.
See "No domestic hot water".
Replace non-return valve.
Check the functions of the actuator -
clean valve seat if required.
Check if the setting of the controller is
correct, - see separate instructions.
Replace immersion sensor.
Replace non-return valve.
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