Danfoss Akva Vita II TD Instructions For Installation And Use Manual page 23

Instructions for installation and use
Problem
Domestic hot water,
Fluctuating temperature
Low temperature/Different tempera-
tures at different tapping points
No enough pressure on the hot water
Long wait for hot water
No hot water
Hot water temperature too low
Hot water temperature too high
Temperature falls during tapping
Temperature falls during tapping
Poor cooling
Discoloured water
(during a protracted period)
Lack of hot water pressure
Danfoss District Energy
Possible cause
Non-return valve in the circulation pipe
defective (leads to mixing – the circula-
tion water pipes become cold during
tapping).
Non-return valve in thermostatic mixer in
the bathroom defective – results in hot
and cold water mixing. Please note that
fluctuating temperatures may occur at
other tapping points in the system!
NB Check all mixers in the house for
faults/defects!
Strainer in the cold water meter or in the
cold water supply line clogged.
Circulation pump out of order (outside
the unit – not part of the delivery).
Dirt strainer in the district heating sup-
ply line clogged.
As above.
Non-return valve in the circulation pipe
defective (results in mixing – the circula-
tion water pipes become cold during
tapping).
Defective domestic hot water controller.
Air in the capillary tube.
Calified plate heat exchanger.
Plate heat exchanger short-circuited/
defective.
Calified plate heat exchanger.
Plate heat exchanger short-circuited.
Calified plate heat exchanger.
VI.GP.U2.02
TD & S substations
Solution
Replace the non-return valve.
Replace the mixer or perhaps only the
non-return valve.
Clean the strainer (cold water meter, in con-
sultation with the water supply company).
Check whether the pump is running –
and whether there is a power supply to
the pump. Make sure that there is no air
in the pump housing.
Clean the filter/dirt strainer.
As above.
Replace the non-return valve.
Check the functionality of the controller –
replace if defective.
Vent the capillary tube.
Clean with acid or replace the plate heat
exchanger.
Replace the plate heat exchanger.
Replace the plate heat xchanger or clean it
with acid.
Replace the plate heat exchanger.
Replace the plate heat exchanger or clean
it with acid.
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DKDHR