Dantherm HCV4 User Manual page 20

Fault finding guide,
Problems, continued
The unit does not
cool sufficiently.
Uneven operation,
with a high degree
of variation in vol-
ume of air.
The home is exces-
sively dried out.
There is moisture
on the inside of
window panes and
other cold surfaces
(autumn, winter,
spring).
18
continued
Problem
The unit does not have a built-
in bypass module.
The unit has most likely been
set to automatic demand con-
trol, which will vary the volume
of air in accordance with the
needs of the home and the rel-
ative humidity of outside air.
The unit is perhaps operating
with excess air change in rela-
tion to the size and purpose of
the home/building.
The air exchange is not enough
or the distribution is insuffi-
cient, which means that critical
rooms do not receive enough
air.
Cause
No error.
If this is the case, set the unit
to manual operation and select
the fan step that fits your par-
ticular needs (normally fan step
3). However, running the unit
with a volume of air that is
constantly at the level required
by national law is not advised
as this leads to a risk of mois-
ture damage and reduced air
quality.
Set the unit to automatic oper-
ation, or set it to fan step 2 or
1 in manual operation.
mended for limited periods of
time only.
Remember that it takes a few
days to raise the humidity level
in the home if it is very dry.
If this doesn't help, contact
your installer to adjust the vol-
ume of air.
Set the unit to automatic de-
mand control so that it can au-
tomatically keep humidity and
moisture at an acceptable level.
Do not allow the unit to run
continuously at fan step 1 or 2
while in manual mode, as there
is no guarantee that it will be
able to keep humidity down
sufficiently when the home is
experiencing periods of excess
humidity.
Action
fan step 2 or 1 is recom-
Continued overleaf