Technical data

3130
CONTROLS
FLOAT SENSOR
Built-in float sensor
detects unwanted
build-up of condensate.
DEALING WITH CONDENSATE
When heat recovery is running up to 95%, the exhaust
air is cooled considerably in the counterflow heat
exchanger. The humidity in exhaust air can then
condense in the heat exchanger, and is collected in a
condensate tray.
A float registers a high level of condensate in the tray
automatically. To prevent stoppages, a drain can be
fitted to the condensate tray to remove water from the
unit. Alternatively, the ventilation unit can be fitted
with a condensate pump to pump condensate away
when it forms.
When the outdoor temperature approaches freezing
point, the exhaust temperature behind the counterflow
heat exchanger drops. This can result in condensate
freezing in the heat exchanger. The Airlinq control
system prevents the formation of ice by increasing
exhaust air and reducing inlet, causing the exhaust
temperature to rise again. If this process is insufficient
to prevent ice forming in the heat exchanger, Airlinq
will protect the unit by shutting down operation.
"PREHEATING"
WITH ELECTRIC PREHEATER
If the ventilation unit is fitted with an electric preheater,
it will heat the outdoor air before it meets the counter-
flow heat exchanger, preventing the formation of ice.
To maintain balance ventilation, the Airlinq control sy-
stem controls the temperature in the unit. It does so by
the heater being connected when needed and keeping
energy consumption to a minimum.
"VIRTUAL PREHEAT"
WITH ELECTRIC COMFORT HEATER
Alternatively, ice formation can be prevented using a
high capacity electric comfort heater. A bypass damper
diverts some of the outdoor air past the counterflow
heat exchanger. The comfort heater heats the outdoor
air to the inlet temperature required. The exhaust air
is cooled down less in the heat exchanger, preventing
ice formation. This process can also be taken over by
a water heating surface. There are more details in the
following section on comfort heaters.
ELECTRIC PREHEATER
Optional preheater for
very cold areas.
CONTROL VIA A HYGROSTAT
WALLMOUNTED HYGROSTAT
A wall-mounted hygrostat registers relative air hu-
midity, and sends either a start or stop signal to the
ventilation unit. The hygrostat is used to set the level
of relative air humidity at which the signal is given.
The hygrostat contains hygroscopic carbon fibres,
the length of which depend on relative air humidity.
When the relative air humidity goes over or under
the level set, the hygrostat sends a start/stop signal
to the ventilation unit. This is often used to activate
full operation on units which otherwise provide basic
ventilation, when the relative air humidity setting is
exceeded.
HYGROSTAT ensures that humidity is automatically
kept down. Can be installed in the room or on the unit.
We supply units all over
Europe. Consequently, we know
that our units have to function
effectively under very different
outdoor temperatures - ranging
from -25°C and up to 35°C.
CONTROL PROCESSES
FROST PROTECTION
BUILTIN ELECTRIC HUMIDITY SENSOR
It should be possible to regulate ventilation according
to demand (demand response) depending on the air
humidity in homes, which is why CV 80 and CV 200 are
both available with automatic humidity control.
A high concentration of CO
2
in a classroom is an in-
dication of human activity, and the need for fresh air.
Similarly, an increased level of air humidity in the home
is an indication of the need for more ventilation.
Humidity is a better indicator in homes. Naturally, there
is nothing to prevent you having several types of regu-
lation, e.g. via humidity, temperature, CO
2
, PIR and VOC.
Relative humidity is highly dependent on the weather.
For instance, aiming for a relative humidity level of
45% inside the home is a waste of time if the level is
60% outdoors. That would simply mean that the unit
will run at full power all summer, or at minimum power
all winter. That is not demand response.
Airmaster decided to make it possible to implement an
extra humidity sensor as an option for CV 80 and CV
200. The extra sensor reacts according to the difference
between outdoor and indoor humidity - i.e. between ab-
solute humidity, and not relative humidity. That means
that the amount of humidity supplied to the air inside
the home is registered. Demand response regulation of
the air volume is proportional between two SET points,
a minimum and maximum. This form of operation saves
considerable energy.