Daikin REYQ44MY1B [2/312] Operation mode 4 2 basic control 5

Si39-302

Table of Contents i

R410A Heat Pump

50Hz

R410A Heat Pump 50Hz .................................................................. i

1. Introduction ............................................................................................ vi

1.1 Safety Cautions ....................................................................................... vi

1.2 PREFACE ................................................................................................x

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

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

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

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

2.2 Outdoor Units ...........................................................................................4

3. Combination of Outdoor Units.................................................................5

4. Model Selection.......................................................................................6

Part 2 Specifications .................................................................... 9

1. Specifications ........................................................................................10

1.1 Outdoor Units .........................................................................................10

1.2 Indoor Units ............................................................................................21

Part 3 Refrigerant Circuit ........................................................... 41

1. Refrigerant Circuit .................................................................................42

1.1 RXYQ5M ................................................................................................42

1.2 RXYQ8, 10, 12M ....................................................................................44

1.3 RXYQ14, 16M ........................................................................................46

2. Functional Parts Layout ........................................................................48

2.1 RXYQ5M ................................................................................................48

2.2 RXYQ8, 10, 12M ....................................................................................49

2.3 RXYQ14, 16M ........................................................................................50

3. Refrigerant Flow for Each Operation Mode...........................................51

Part 4 Function............................................................................63

1. Operation Mode ....................................................................................64

2. Basic Control.........................................................................................65

2.1 Normal Operation ...................................................................................65

2.2 Compressor PI Control...........................................................................66

2.3 Electronic Expansion Valve PI Control...................................................72

2.4 Cooling Operation Fan Control...............................................................73

3. Special Control......................................................................................74

3.1 Startup Control .......................................................................................74

3.2 Oil Return Operation ..............................................................................75