GB.DEHUM.071201
GOLD Functional Guide, Dehumidification
1. General
2. Material Specification
The Dehumidification function is intended for use when
the GOLD unit ventilates rooms where it is desirable to
avoid high moisture content in the air.
Air handling unit
All types of GOLD
Humidity/temp. sensor for supply air duct TBLZ-1-31-1
The function requires that you supplement the GOLD
unit with an air cooler and an air heater in the supply air
duct. The air cooler should be installed upstream of the air
heater viewed in the direction of air flow.
Other equipment required:
Air cooler and air heater in the supply air duct. The air
cooler should be installed upstream of the air heater
viewed in the direction of air flow.
The function can be advantageous when combined with
Dew Point Regulation. See the Functional Guide.
Registered design. The company reserves the right to make design changes without prior notice.
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GB.DEHUM.071201
3. Function
The function controls the operation of pertinent components to keep the relative humidity, near the combined
humidity and temperature sensor in the supply air duct,
below a limit value . The limit value can be preset in the
hand-held terminal.
Thanks to the effects of condensate drainage and the subsequent rise in supply air temperature, the relative humidity in the supply air decreases.
The function enables the air cooler and air heater to operate at the same time, which is not possible during normal
operation.
On the basis of the preset setpoints for supply air temperature and humidity, the control system calculates the dew
point setpoint (the temperature at which the moisture
in the air condensates). In response to readings received
from the combined humidity and temperature sensor, the
controller measures the current dew point.
Important! Satisfactory operation is conditional on the
use of an air cooler that generates sufficiently high cooling
capacity to provide adequately low air temperature. This
guarantees the right degree of condensate precipitation. If
this condition is not met, the use of this function will only
waste energy and will not have any dehumidifying effect.
The controller activates the air cooler if the current dew
point is higher than the setpoint. The moisture in the air
then condenses on the cold surfaces of the air cooler, drips
into a tray and runs out through the drainage pipework of
the air cooler.
The function also presupposes that ERS regulation or
supply air temperature regulation is selected. If Extract Air
Temperature Regulation is selected, “heating after condensation” will only heat the air to the preset min. permissible supply air temperature and this will render dehumidification ineffective.
This causes a decrease in supply air temperature. When
this occurs, the controller activates the air heater. The
output from the air heater increases the supply air temperature to the level required.
Supply air sensorCombined humidity and
temperature sensor
Air cooler
Air heater
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Registered design. The company reserves the right to make design changes without prior notice.
GB.DEHUM.071201
4. Electrical Connections.
Install the combined humidity and temperature sensor
in the supply air duct near, and in the same way as, the
regular supply air sensor. Connect the humidity and temperature sensor’s modular cable to an optional modular
connection, marked Internal EIA-485, on the control unit
of the GOLD unit.
If the sensor cable is not long enough, use a TBLZ-1-05-3
extension cable(accessory).
5. To Enter Settings.
For basic facts on how to use the hand-held micro terminal, see the Operation and Maintenance Instructions for
the GOLD unit.
The dehumidification function must be manually activated, under INSTALLATION – FUNCTIONS – HUMIDITY in the
hand-held terminal.
INSTALLATION
FUNCTIONS
*FUNCTIONS*
TEMPERATURE
FLOW/PRESSURE
FILTERS
OPERATION
HEATING
COOLING
HUMIDITY
ReCO2
IQNOMIC PLUS
Select Dehumidification.
*HUMIDITY*
DEHUMID. REG..
DEW POINT REG.
The function can be activated under FUNCTION, OFF/ON.
*DEHUMID. REG.*
FUNCTION, OFF/ON
SETTINGS
Set the value required under SETTINGS.
Select the limit value for the highest permissible relative
humidity determined according to moisture calculation,
e.g. from a Moliere Diagram.
6.
*DEHUMID. REG.*
FUNCTION, OFF/ON
SETTINGS
*DEHUMID. REG.*
SUPPLY AIR – HUMIDITY
50%
Performance Checks
Temperature sensor:
Current moisture content, temperature and dew point
readings can be viewed under INSTALLATION – READINGS
– HUMIDITY – DEW POINT REG. If the readings are reasonable, then the wiring has been connected correctly.
If the functions are activated but the accessories have not
been connected correctly, an alarm will be initiated. See
the Operation and Maintenance Instructions for GOLD air
handling units for a description of each alarm.
Registered design. The company reserves the right to make design changes without prior notice.
www.swegon.com
GB.DEHUM.071201
www.swegon.com
Registered design. The company reserves the right to make design changes without prior notice.
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