59
Service manual
Daikin R32 Rooftops UATYA-B
ESIE21-02 – 2021.03
3.13.5 Recirculation
Full air recycling at system start-up or after a washing cycle is intended to achieve the temperature and humidity setpoints
more quickly.
If air recycling only is required at unit start-up, parameter “DA52” must be set to “2”.
If parameter “DA52” is set to “3”, a washing cycle is performed before recycling.
While recirculating is in progress, the controller keeps the exhaust air and external air dampers closed and it keeps the
recirculated air damper open for the time setpoint stored in parameter “DA55”.
If the value in parameter “DA53” is set to “0”, the washing cycle takes place without any thermoregulation of the air. If the
value in parameter “DA53” is set to “1”, thermoregulation is active.
While recycling is in progress, a button flashes on the main screen which is pressed to stop the cycle manually before the
time set in parameter “DA55” elapses.
3.13.6 Free cooling
If the external air temperature value is favourable, the cooling demand in the room is fulfilled with air changing, either totally
or partially.
The free cooling function manages units with either 2 or 3 dampers:
-
recirculated air damper;
-
external air damper;
-
exhaust air damper.
In 2-damper units air is exhausted using extractors or other equipment and these are managed by the controller in the unit.
The parameters concerned are shown in the table.
The values of the parameters are representative. In specific cases, different values can be set.
Parameter Value UM
Description
DA1
1
-
All dampers - Management mode
DA5
0
-
External air - FC / FH - Enabling mode
DA6
1.0
°C
External air - FC / FH - Temperature-based control - Temperature diff. required for
enabling
DA7
1.0
kJ/kg
External air - FC / FH - Enthalpy-based control - Enthalpy diff. required for enabling
DA8
-2.0
°C
External air - Summer / Winter FC - Temperature offset for regulation
DA9
2.0
°C
External air - Summer / Winter FC - Temperature diff. for regulation
DA12
30
%
External air - FC / FH - Min opening
DA13
100
%
External air - FC / FH - Max opening
A graphical representation is shown below.
DA8
DA9
DA13
DA12
%
ST1
TeSdR °C
Fig. 25 Damper command in free cooling mode
3 Software functions
Summary of Contents for UATYA-B
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