Danfoss Link User Manual page 28

Troubleshooting
Symptom
I use the weekly schedule
function, but I am unable to
obtain the desired tempera-
ture at the desired time.
Danfoss Heating Solutions
Danfoss One®
Possible cause
The system has a built-in fore-
cast function, which gradually
'learns' how quickly the indi-
vidual room can be reheated.
Once the system has learned
how quickly the room can be
reheated, the re-heat function
will start at the right time.
Your installer may have de-
activated this function from
the service menu (the fore-
cast function is activated in
standard settings). If the fore-
cast function is deactivated,
the re-heat cycle will only
start when the system enters
a comfort period, i.e. it will
take longer to reach the de-
sired room temperature.
The heat source also runs
with a temperature reduction
schedule, e.g. a gas boiler that
runs with a reduced flow tem-
perature during night hours.
This can result in insufficient
heating output when the
heating system needs it.
The decreased temperature is
set so low that the reheating
cannot be achieved within
the desired time interval.
The presetting of the radiator
valve is too low.
Solution
The forecast function will im-
prove the longer the system
has been in use. During the
first two weeks after start-up
of a newly installed system,
the system must 'become fa-
miliar' with the house. If after
a couple of weeks the system
cannot reach the desired
temperature, contact your
installer to see if the forecast
function has been deacti-
vated.
Check your heat source to
see if it has a temperature
reduction schedule; if so,
you should ensure that there
is enough power available
when the system needs it.
Danfoss recommends using
only the Danfoss Link
set the temperature reduc-
tion periods.
Try to set a slightly higher
temperature for the reduc-
tion period. If you have heavy
floor heating, you cannot
lower the temperature by
more than 1-2 degrees at
night, as heavy floor heating
has a relatively long response
time.
For rooms with radiator
heating, a max. reduction of
around 4 degrees is recom-
mended.
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