Troubleshooting - Domestic Hot Water - Danfoss Akva Lux II TDP-F Instructions For Installation And Use Manual

Instructions for installation and use

14.2 Troubleshooting - Domestic hot water

Problem
Variations in temperature
Low temperature / variations in tem-
perature at the draining points
Not enough pressure on the hot water
Long waiting time
No domestic hot water
DHW temperature too low
DHW temperature too high
Declining temperature during tapping
Poor cooling
Discoloured water (during a protracted
period)
Lack of hot water pressure
Danfoss District Energy
Akva Lux II TDP-F
Possible cause
Non-return valve on the circulation line
defective (leads to mixing - and the
circulation water pipes become cold du-
ring tapping).
Non-return valve in thermostatic mixer
tap in the bathroom defective - leads to
mixing of cold and hot water-. Note that
variations in temperature may occur at
other draining points/water taps in the
system!
REMEMBER, to check all the mixer taps in
the house!
Dirt strainer in cold water meter or in the
cold water supply line clogged.
Circulation pump out of operation - (not
part of the dly).
Dirt strainer on DH supply clogged.
See above.
Non-return valve on the circulation line
defective (leads to mixing - and the
circulation water pipes become cold dur-
ing tapping).
Defective DHW controller.
Air in capillary tubes.
Calified heat exchanger.
Short-circuiting of / defective heat
exchanger.
Calified heat exchanger.
Plate heat exchanger short-circuited.
Calified plate heat exchanger.
VI.HE.A1.02
Solution
Replace non-return valve.
Replace mixer tap, or non-return valve
only.
Clean dirt strainer (cold water meter
possibly in consulation with the water
supply company).
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.
Clean dirt strainer.
See above.
Replace non-return valve.
Check the functions of the controller,
and replace if required.
Air and rinse capillary tubes.
Clean heat exchanger with acid solution
or replace heat exchanger.
Replace heat exchanger.
Clean heat exchanger with acid solution
or replace heat exchanger.
Replace the plate heat exchanger.
Replace the plate heat exchanger or
clean it with acid.
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DKDHR