Daikin UATYA-B, Operation Manual

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Service manual Daikin R32 Rooftops UATYA-B
ESIE21-02 – 2021.03
3.15.2 Night Shift System function
This function is designed to add a different ventilation unit setup, typically to reduce the condenser noise levels. The function
may be activated according to time bands and selected weekdays.
This function is normally used to reduce the noise levels during nightly hours.
Units are released from the factory with this function disabled.
The function is only enabled during compressor operation in cooling mode.
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
EFA6 30 % Cooling - Min. speed
EFA7 60 % Cooling - Maximum speed with only one active compressor on two
EFA8 100 % Cooling - Maximum speed with two active compressors
EFA9 20.0 °C Cooling - Condensation setpoint for min. speed/opening
EFA10 45.0 °C Cooling - Condensation temperature with only one active compressor on two
EFA11 52.0 °C Cooling - Condensation temperature for max. speed/opening
EFA30 46.0 °C Cooling - Night shift - Temperature at min. speed
EFA31 57.0 °C Cooling - Night shift - Temperature at max. speed
EFA32 23:00 - Cooling - Night shift - Beginning of time band (0÷24)
EFA33 6:00 - Cooling - Night shift - End of time band (0÷24)
EFA34 1 - Cooling - Night shift - Enable on Monday
EFA35 1 - Cooling - Night shift - Enable Tuesday
EFA36 1 - Cooling - Night shift - Enable Wednesday
EFA37 1 - Cooling - Night shift - Enable Thursday
EFA38 1 - Cooling - Night shift - Enable Friday
EFA39 1 - Cooling - Night shift - Enable Saturday
EFA40 1 - Cooling - Night shift - Enable Sunday
The default values must be changed by service technicians, based on the installation requirements.
A graphical representation is shown below.
%
EFA12
TCond °C
EFA13
EFA7
EFA6
EFA8
EFA10 EFA11 EFA9
1c
2c
EFA31 EFA30
Fig. 36 Control of normal fan speed and with “Night Shift System” function
In addition to the parameters listed in the table, the abbreviations in the graph are:
- Tcond = Condensing temperature
- % = percentage value of signal for fan control
- 1c = one compressor in operation
- 2c = two compressors in operation
3 Software functions