44
Service manual
Daikin R32 Rooftops UATYA-B
ESIE21-02 – 2021.03
In addition to the parameters listed in the table, the abbreviations in the graph have the following meanings:
-
PdR = pressure measured at the reference point;
-
Avar = percentage value of “amplitude” variation;
-
Tvar = delay between two consecutive demands for ventilation variation;
-
Inc = increment;
-
Dec = decrement.
The controller measures the pressure value at the reference point and compares it with the setpoint value stored in para
-
meter “RFA33”.
A dead zone exists below and above the setpoint which corresponds to the value set in parameter “RFA36”.
If the measured value is lower than the setpoint minus the dead zone (“RFA33” - “RFA36”), the controller calculates the
increment percentage and the delay between the two ventilation variations using the values set in the relevant setup para
-
meters.
If the measured value is higher than the setpoint plus the dead zone (“RFA33” + “RFA36”), the controller calculates the
decrement percentage and the delay between the two ventilation variations using the values set in the relevant setup pa
-
rameters.
The ventilation percentage is always limited by the minimum and maximum values set in parameters “RFA7” and “RFA8”
respectively.
According to the values shown in the graphs, the greater the distance between the measured value and the setpoint, the
higher the speed percentage variation and the shorter the time between two consecutive variations. On the other hand,
the smaller the distance between the measured value and the setpoint, the smaller the speed percentage variation and the
longer the time between two consecutive variations.
If the temperature/humidity control parameters need to be edited, the new entered values must be consi
-
stent with the set parameters.
Special conditions
If the device sensing the pressure at the reference point experiences a malfunction, the controller will override the output
that controls ventilation at the average value measured in the last 30 minutes.
If the unit has been in operation for less than 30 minutes, the controller will stop the unit and it will output the corresponding
alarm.
3.9.11 Ventilation control with constant pressure difference
This function is used to change the fan speed, keeping constant the difference in the pressure values measured between
the reference point in the air channel and the room, with respect to the setpoint value.
The parameters involved are shown in the table.
The values of the parameters are representative. In specific cases, different values can be set.
Parameter Value UM
Description
RFA7
30
%
Minimum speed
RFA8
100
%
Maximum speed
RFA49
10.0
Pa
Constant pressure difference control - Pressure delta setpoint
RFA50
-50.0
Pa
Constant pressure difference control - Min. pressure difference setpoint
RFA51
50.0
Pa
Constant pressure difference control - Max. pressure difference setpoint
RFA52
2.0
Pa
Constant pressure difference control - Neutral area
RFA53
5.0
Pa
Constant pressure difference control - Differential required for decrement
RFA54
5.0
Pa
Constant pressure difference control - Differential required for increment
RFA55
60
s
Constant pressure difference control - Max. increment time
RFA56
15
s
Constant pressure difference control - Min. increment time
RFA57
60
s
Constant pressure difference control - Max. decrement time
RFA58
15
s
Constant pressure difference control - Min. decrement time
RFA59
5
%
Constant pressure difference control - Max. increment amplitude
RFA60
1
%
Constant pressure difference control - Min. increment amplitude
RFA61
5
%
Constant pressure difference control - Max. decrement amplitude
RFA62
1
%
Constant pressure difference control - Min. decrement amplitude
3 Software functions
Summary of Contents for UATYA-B
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