Daikin UATYA-B, Руководство по эксплуатации

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Service manual Daikin R32 Rooftops UATYA-B
ESIE21-02 – 2021.03
3.3.2 Thermoregulation in heating mode
The thermoregulation of the unit in heating mode depends on parameter “ST9”, which identifies the reference probe for the
temperature value in the setpoint (parameter “STH1”), and on parameter “ST11” which determines the type of temperature
control.
In proportional control mode, the controller activates the available resources as the value read by the reference probe de -
creases in comparison to the setpoint value.
When “Cascade” control is selected, the controller enables the resources and at the same time monitors the air temperature
in the delivery line.
In PID control mode, the controller activates the available resources as the demand increases. The controller calculates the
demand and checks the value measured by the probe against the setpoint value and according to its variation over time
using the parameters set in the PID.
Proportional temperature control
If parameter “ST11” is set to “0”, proportional control is enabled.
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
STH1 20.0 °C Mechanical heating / Auxiliary heating in winter mode - Temperature setpoint
STH2 15.0 °C Mechanical heating / Auxiliary heating in winter operating - Min. temperature setpoint
STH3 40.0 °C Mechanical heating / Auxiliary heating in winter operating - Max. temperature setpoint
STH4 2.0 °C Mechanical heating - Proportional - Activation differential
STH5 0.0 °C Mechanical heating - Proportional - Activation neutral zone
STH6 0.0 °C Mechanical heating - Proportional - Offset
A graphical representation is shown below.
STH5 STH6 STH4
100
0
%
STH1
SdR °C
Fig. 6 Graphical representation of stepped heating demand
In addition to the parameters listed in the table, the abbreviations in the graph are:
- SdR = reference probe;
- % = percentage demand value.
3 Software functions