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WISE User Manual
Condensation
Why is condensation detected?
Condensation is detected to prevent precipitation of water
droplets on pipes and cooling coils at low temperatures that can
create problems in the property.
How is condensation detected?
In products
In products, condensation can be detected with a reactive
sensor (CG IV) that is mounted on the supply pipe in the
product. The sensor’s temperature in relation to the room
temperature and humidity gives a value to WISE CU / WISE IORE.
Below the set lower limit the cooling function is shut o via the
water valve until is value goes above the set upper limit, see the
factory settings in the table below.
In rooms
A dewpoint function that is proactive is used in rooms. With
The WISE system accessory the humidity of the air is measured
in %RH, together with the measured room temperature which
permits a dewpoint to be calculated. This is used to be compared
against a temperature from a sensor (EXT PT-1000 connected to
Adjustable room parameters in SuperWISE
Section Description Standard value Min. Max. Unit
Lowest user level
(read/write)
Function
Air ow Supply air 100 0 100 % Installation/Installation Supply air ow for condensation
a WISE CU) which measures the surface temperature of the pipe
and is placed on the supply pipe in the product.
There is an adjustable level to specify when the cooling function
should be closed and a resetting level when cooling should be
switched on. Factory settings is the cooling is switched o when
the supply temperature is 2 degrees above the dewpoint and
returns when the supply temperature is 3 degrees above the
dewpoint. These are adjustable on room level via the SuperWISE
interface.
The air ow required for the risk of condensation precipitation on
products in the room can also be specied. A percentage of the
room’s maximum ow is set as a value for the risk of condensa-
tion, this is to air out moist air that may be in the room.
How is the dewpoint calculated?
When air of a specic temperature and relative humidity cools
the relative humidity will increase. If you have a surface that is
cold, the water vapour at a specic temperature will condense
of the surface. The temperature when surface condensation
forms is called the air’s dewpoint, this is calculated by measur-
ing the relative humidity in the room, room temperature and
the temperature on the cold surface where there is a risk for
condensation being precipitated.
Duct heater/cooler
Why a duct heater/cooler?
Duct heater/cooler is used to heat/cool the air in a room.
This function can be used when certain rooms have dierent
temperatures compared to the rest of the building. For example,
a conference room my need to be heated when it is not used
while the rest of the building needs to be cooled due to a high
temperature load caused by occupancy.
How do duct heaters/coolers work?
A duct heater and/or a duct cooler has the task of heating or
cooling the supply air in a duct. A WISE IORE can control a duct
heater and/or a duct cooler.
The principle is that a room temperature is desired with a
setpoint value and the duct heater/cooler regulates the supply
air temperature to achieve the desired room temperature.
In order not to exceed the adjustable temperature dierence
(max. permitted dierence between room temperature and
supply air temperature) the temperature load is converted (via
sequence settings) to a supply air temperature setpoint value
within the permitted limits.
It is possible to specify an air ow limit for when heating and
cooling are to be permitted. That is say, for a heating/cooling
requirement the air ow will rst increase to the given limit
before heating/cooling starts. This limit can then be used to
prevent overheating/the development of condensation. The air
ow limit is aected by a factor that is adjustable in the interval
0…100% where 0% means the factor is not used.
If the air handling unit is stopped heating and cooling are
switched o.
It is possible to set the required supply air temperature when
the room, zone or system is in the neutral zone (neither cool-
ing or heating mode). It is set per air handling unit or zone as
“Temperature at 0% requirement” or on room level as “Temper-
ature in neutral zone”.
Duct heater/cooler in a room
There can be more than one duct heater/cooler in the room.
Each product has its own settings for heating and cooling
sequences. It is possible to have two duct heaters in sequence
independent of the heat source. The same applies to coolers. The
permitted supply air temperature settings are used in the room
for max. temperature dierence. When the temperature load is
zero, the set temperature in the neutral zone is used.
It is also possible to manage a mode when all the supply air
products in the room are not connected to the duct heater/
cooler. If this is the case, it is important that the setting is made
correctly, as normally all supply air products contribute with
supply air temperature aer the duct heater/cooler and the
combined supply air ow used for the overheating function. If no
setting is made, it is assumed that all supply air products in the
room are connected to the duct heater/cooler if installed in the
room. In those exceptions when only one or two supply air prod-
ucts in the room are connected to the duct heater/cooler, these
must point to the address of the right duct heater/cooler under
settings for Duct heater/cooler on product level. The products
in the room that are not assigned an address for a duct heater/
cooler are then assumed to not be connected to one.
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