50
Service manual
Daikin R32 Rooftops UATYA-B
ESIE21-02 – 2021.03
The controller starts up the compressors following the principle of the lower number of starts.
When the unit fits an inverter compressor (parameter “CF12” = 1), the inverter compressor gets started first and stops last.
If the unit has at least other two compressors in addition to the inverter compressor, their start-up sequence follows the
principle of the lower number of starts.
Excluding the inverter compressor, the other compressors are stopped in the same order as they have been started: the
first compressor to get started is also the first to stop.
3.11.2 Management of compressor with inverter
The controller is designed for managing one inverter compressor on both single- and dual-circuit units.
The refrigerant circuit can consist of just the inverter compressor or of one inverter compressor and one ON/OFF compres
-
sor.
The parameters involved are shown in the table.
The values of the parameters are representative. In specific cases, different values can be set.
Parameter Min.
UM
Description
CO20
120
s
Inverter - Min. time before start-up
CO21
25
0,01%
Inverter - Step
CO22
1000
ms
Inverter - Ramp time
CO24
8
-
Inverter - Type of configured compressor
Below is a graphical representation of the operating sequence of an inverter compressor and an on/off compressor, based
on the thermoregulation demand variation.
ET25
t
EEV
Req
YVL
Off
C inv
C 2
C26
Off
On
ET24
C20
Off
Off
On
Fig. 21 Compressor start-up
3 Software functions
Summary of Contents for UATYA-B
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