Daikin FXDQ25NVE [2/218] R410a heat pump 50hz

SiBE39-402

Table of Contents i

R410A Heat Pump

50Hz

1. Introduction .............................................................................................v

2. Safety Cautions.......................................................................................v

Part 1 General Information...........................................................1

1. Model Names of Indoor/Outdoor Units....................................................2

2. External Appearance...............................................................................3

2.1 Indoor Units..............................................................................................3

3. Capacity Range.......................................................................................4

Part 2 Specifications ....................................................................5

1. Specifications..........................................................................................6

1.1 Outdoor Units ...........................................................................................6

1.2 Indoor Units..............................................................................................8

Part 3 List of Electrical and Functional Parts............................23

1. List of Electrical and Functional Parts...................................................24

1.1 Outdoor Unit...........................................................................................24

1.2 Indoor Unit..............................................................................................25

Part 4 Refrigerant Circuit ...........................................................29

1. Refrigerant Circuit .................................................................................30

1.1 RXYSQ4·5·6M........................................................................................30

2. Functional Parts Layout ........................................................................32

2.1 RXYSQ4·5·6M........................................................................................32

Part 5 Function............................................................................33

1. Operation Mode ....................................................................................34

2. Basic Control.........................................................................................35

2.1 Normal Operation...................................................................................35

2.2 Compressor PI Control...........................................................................36

2.3 Electronic Expansion Valve PI Control...................................................37

2.4 Cooling Operation Fan Control...............................................................38

3. Special Control......................................................................................39

3.1 Startup Control .......................................................................................39

3.2 Oil Return Operation ..............................................................................40

3.3 Defrosting Operation ..............................................................................42

3.4 Pump-down Residual Operation ............................................................43

3.5 Restart Standby......................................................................................44

3.6 Stopping Operation ................................................................................45

3.7 Pressure Equalization Prior to Startup ...................................................46

4. Protection Control .................................................................................47

4.1 High Pressure Protection Control...........................................................47

4.2 Low Pressure Protection Control............................................................48