Daikin RXQ18PHY1 [2/394] Part 2 specifications 3

Si34-704

Table of Contents i

R-410A Cooling Only

50Hz

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.................................................................6

4. Model Selection.......................................................................................8

Part 2 Specifications .................................................................. 13

1. Specifications ........................................................................................14

1.1 Outdoor Units .........................................................................................14

1.2 Indoor Units ............................................................................................35

Part 3 Refrigerant Circuit ........................................................... 59

1. Refrigerant Circuit .................................................................................60

1.1 RXQ5P ...................................................................................................60

1.2 RXQ8P ...................................................................................................62

1.3 RXQ10P, 12P.........................................................................................64

1.4 RXQ14P, 16P, 18P ................................................................................66

1.5 Outdoor air processing unit FXMQ125MFV1~250MFV1........................68

2. Functional Parts Layout ........................................................................69

2.1 RXQ5P ...................................................................................................69

2.2 RXQ8P ...................................................................................................70

2.3 RXQ10P .................................................................................................71

2.4 RXQ12P .................................................................................................72

2.5 RXQ14P, 16P, 18P ................................................................................73

3. Refrigerant Flow for Each Operation Mode...........................................74

Part 4 Function............................................................................ 83

1. Function general ...................................................................................84

1.1 Symbol ...................................................................................................84

1.2 Operation Mode......................................................................................85

2. Basic Control.........................................................................................86

2.1 Normal Operation ...................................................................................86

2.2 Compressor PI Control...........................................................................86

2.3 Electronic Expansion Valve PI Control...................................................98

2.4 Step Control of Outdoor Unit Fans .........................................................98

2.5 Outdoor Unit Fan Control in Cooling Operation .....................................98