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AB Industrietechnik srl – Via Julius Durst, 70 – 39042 BRESSANONE (BZ) Italy – Tel: +39 0472/830626 – [email protected] – www.industrietechnik.it
20. Dew point function in cooling mode
During the summer season the dew point function is used to avoid the control with a temperature that may be too close or
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The dew point function may be applied for a single area that can be selected for SLAVE_X controller or for the MASTER or
SLAVE_Y controller.
• SLAVE_X
controller
To calculate the dew temperature, the value of the room temperature and humidity of the considered zone must be known.
The temperature sensor corresponds to the control temperature used for the considered zone.
The humidity sensor may be the one inside the appliance (only for the FH-xxxSH1 appliances), or a humidity transmitter with
0..10 V output, connected to the AI3 input set as 0..10 V input for humidity (
M12
,QWKLVODWWHUFDVH¿WWKHKXPLGLW\VHQVRU
in the desired zone.
To use the dew point function with the internal humidity sensor for zone 1, set parameter
I44
to 1.
To use the dew point function with a humidity transmitter for zone 1, set parameter
I44
to 6.
To use the dew point function with the internal humidity sensor for zone 2, set parameter
I44
to 2.
To use the dew point function with ahumidity transmitter for zone 2, set parameter
I44
to 7.
To use the dew point function with the internal humidity sensor for zone 3, set parameter
I44
to 3.
To use the dew point function with a humidity transmitter for zone 3, set parameter
I44
to 8.
To use the dew point function with the internal humidity sensor for zone 4, set parameter
I44
to 4.
To use the dew point function with a humidity transmitter for zone 4, set parameter
I44
to 9.
• MASTER or SLAVE_Y controller
To calculate the dew temperature, select a remote temperature sensor or the internal sensor.
To select a remote temperature sensor, set
M08
=13 for the AI1 remote sensor, or
M10
=13 for the AI2 remote sensor, or
M12
=13
for the AI3 remote sensor. To use the internal temperature sensor, check that parameters
M08
,
M10
,
M12
are all set at at differ-
ent value than 13.
To use the dew point function with the internal humidity sensor, set parameter
I44
to 5.
To use the dew point function with a humidity transmitter, set parameter
I44
to 10.
The minimum control setpoint is the sum of the calculated dew temperature and the dew point offset (parameter
I45
). This last
parameter allows operation with a certain safety margin in relation to the dew temperature.
The selected zone is controlled by taking the maximum value between the previously calculated minimum control setpoint
(dew tempe
I45
) and the cooling control setpoint set by the user for that zone.
If, during operation, the control temperature of the zone drops below the minimum control setpoint, the dew point alarm is
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M19
=13) is enabled (available only for SLAVE_X
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RUUHOD\'2FRQ¿JXUHGDVFRQGHQVDWLRQRUGHZSRLQWDODUP
M17
=13) is enabled (only available for SLAVE_X controllers
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and
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goes off if the control temperature returns above the minimum control se 2°C.
21. Anti-condensation
function
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M04
=4 or
M06
=4), in case of alarm activation, the cool-
ing valve is closed while the other functions remain active. Icons
and
ÀDVK
MASTER controller or SLAVE_Y controller:
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the MASTER will be sent to all SLAVE_X controllers.
SLAVE_X controller:
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14, 16 to 21, 23), it will be enabled.
If the DO5 relay output has the condensation or dew point alarm function (
M19
=13) or if DO3 has the condensation or dew point
alarm function, (
M17
=13) is enabled in case of condensation alarm.
The alarm is sent to the MASTER controller which stops the circulator, the valve if
I46
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If there is any Modbus communication during operation, the MASTER controller sends the supply temperature value to all
SLAVE controllers. During the summer season if one SLAVE controller calculates a dew point (dew tempe
I45
) , it
wil also control that the supply temperature is not below or equal to the dew point. If the supply temperature reaches or drops
below this point for a period of time longer than
I96
minutes, a potential condensation risk on the SLAVE may occur. The
