Dantherm HCH 5 Installations- Und Serviceanleitung Seite 29

Fault finding instruction,
Inconvenience, con-
tinued
The house is being unnec-
essarily dried out.
There is damp on the inside
of the windows and other
cold surfaces (autumn,
winter and spring)
The unit is always operat-
ing at the same speed.
The display goes out after a
short period of time, after
which only the green light-
emitting diode is on.
27
continued
Inconvenience
The unit might be operat-
ing with too high level of
air exchange compared to
the size and needs of the
house.
The unit has been set to
operate at the nominal air
change (Fan Step 3) in
Manual Operating Mode.
Low level of humidity can
be observed especially dur-
ing winter when the outside
air is very dry.
The air change is too low or
the air distribution is un-
fortunate which causes too
low air change in critical
rooms.
The unit is set to Manual
Operation Mode at one
fixed speed.
The display goes into En-
ergy Saving Mode after 2
minutes to effect power
save.
Cause
Check if the air flow rates
correspond the size of the
house and ventilation load,
do this by controlling the air
flow rates, which is de-
scribed "How to balance the
unit" on page 12.
Switch to Automatic De-
mand Mode or set the air
flow rate at Fan Step 2 or 1
in Manual Operation Mode.
Using Fan Step 2 or 1
is only recommended for a
short period of time.
Accurately adjust the air
flow rates and its distribu-
tion through balancing the
valves to ensure the air
change in critical places.
Set the unit to Automatic
Demand Mode so it auto-
matically keeps the humid-
ity on a suitable level.
Do not let the unit operate
constantly on Fan Step 1 or
2 in Manual Operation
Mode as it does not guar-
antee keeping the humidity
level in the house down,
when the moisture load of
the house is high.
Switch to Automatic De-
mand Mode after which the
unit is going to adjust to air
flow rates according to the
need of the house.
The unit is operating cor-
rectly.
Action