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Subject to change without notice | 83053700lUK | ait-deutschland GmbH
12 Cooling
There are two ways to use the heat pump for air con-
ditioning in rooms, through: „passive cooling“ and „ac-
tive cooling“.
The main dierence is the compressor operation.
While the compressor is not needed for passive cool-
ing, i.e. it is passive, the compressor operates during
active cooling, i.e. it is active.
Another dierence is that both passive and active
cooling is possible with the ground and groundwater
heat sources. But only active cooling is possible with
the outside air heat source.
Passive cooling is the more cost-eective option. Low-
ering the temperature by 3-4 K is often fully sucient
to produce a comfortable room temperature in the
summer.
Whereas higher cooling output is possible with active
cooling.
Passive cooling uses the fact that the ground and
groundwater, from a depth of around 8 metres, are
more or less a constant temperature all year round
and in the summer are around 9 °C to 10 °C cooler
than the outside air or the interior rooms.
This temperature dierence is sucient to cool a build-
ing with energy from the ground and groundwater. Ad-
ditional fan coils, cooling ceilings, underoor heating
and thermo active building systems (embedding cool-
ing pipes), such as concrete core thermal activation,
can be used for direct cooling.
IMPORTANT
By cooling with low ow temperatures, con-
densate can be expected to form on the heat
distribution system as the temperature falls
below the dew point. If the heat distribution
system is not designed for these operating
conditions, it must be protected by appro-
priate safety devices, e.g. dew point monitor
(purchasable accessory).
NOTE
If the heating surfaces are used for heating
and cooling, the control valves must be suita-
ble for heating and cooling.
In addition, a dew-point monitor should be
used for cooling.
NOTE
Use recommended accessory dew point
monitors.
The room thermostat of the cooling function
(purchasable accessories, optional)
The room thermostat is used to release and to switch
o the cooling function:
I Cooling function switched on
Cooling function o
Use of the cooling function
The heating and heat pump regulation program acti-
vates the cooling function only if the following condi-
tions are fullled:
● Heat pump type with integrated cooling function
● Room thermostat of the cooling function is
switched on
● Temperature of the heat source is ≥ +5 °C
● Heat pump is currently not being used for „heat-
ing“ nor for „domestic water heating“. If the heat
pump control program sends the “domestic wa-
ter heating” request to the heat pump, the cool-
ing function of the heat pump stops automati-
cally for the duration of the domestic water heat-
ing
● The „Automatic“ setting is selected under the
„Cooling mode“ heading
● The outside temperature release set at the con-
trol is exceeded
Operating manual of the heating and heat pump
regulator
The cooling function can be used in two variants:
Variant 1:
Manual switching from heating to cooling mode
(and vice versa). This uses a xed pre-set ow
temperature.
Operating manual of the heating and heat pump
controller.
Variant 2:
Automatic switching from heating to cooling
mode (and vice versa). This variant can operate
using a cooling curve.
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