KJM MANDÍK
–
Detailed operating instructions
M&C KJMPNO 07/2022
MANDÍK, a.s.,
23
Humidity control
6.3
Humidity control is based on the required and actual humidity in the room or the exhaust
or supply air. Humidification is carried out using steam generators. Dehumidification can be done
passively or actively. Passive dehumidification of a ventilated room is carried out by ventilation
under the condition that the outdoor absolute humidity is less than the required absolute
humidity. In passive dehumidification, the amount of outdoor air supplied can be increased by
increasing the output of the fans, opening the supply air damper or both simultaneously. Active
dehumidification uses a cooling and heating component whereby the supply air is first cooled to
remove moisture and then reheated to the required temperature. In the case of the required
supply humidity, this is direct control. When controlling for room or exhaust humidity
requirements, cascade control (
PID–
Supply
) is used, which calculates the required supply humidity
based on the difference between the required and actual humidity, allowing better control of the
required humidity. Relative humidity sensors with 0-10 V analog output are mainly used for
humidity measurement, but sensors with digital output can also be used.
State
(
Off
/
OK
/
Low
/
High
/
Outdoor
)
– current humidity control status relative to the required
and actual measured value.
State
Off
–
humidity control is not active.
State
OK
–
current humidity is within the required range
(
Comfort
/
Economy
)
–
LowHysteresis
to
(
Comfort
/
Economy
)
+
HighHysteresis
.
State
Low
–
current humidity < required one (
Comfort
/
Economy
) –
LowHysteresis
.
State
High
–
current humidity < required one (
Comfort
/
Economy
) +
HighHysteresis
.
State
Outdoor
–
passive dehumidification with outdoor air is performed.
Currently
(%)
– current temperature on the humidity sensor.
DesiredSupply
(%)
– current required humidity of the supply air.
Required
(%)
– required humidity for all regimes when the unit is controlled from a room unit
and the humidity is measured by a sensor with analog output.
Comfort
(50%)
– required humidity in the
Comfort
regime when humidity is measured by a
sensor with analog output and the unit is not controlled from a room unit.
Economy
(50%)
– required humidity in the
Economy
regime if the humidity is measured by a
sensor with analog output and the unit is not controlled from a room unit.
