Preparing the installation site......................................................................................................................................... 51

6.2.1

Installation site requirements of the outdoor unit........................................................................................ 51

6.2.2

Additional installation site requirements of the outdoor unit in cold climates............................................ 53

6.2.3

Installation site requirements of the indoor unit .......................................................................................... 54

6.3

Preparing water piping ................................................................................................................................................... 55

6.3.1

Water circuit requirements............................................................................................................................ 55

6.3.2

Formula to calculate the expansion vessel pre-pressure .............................................................................. 59

6.3.3

To check the water volume and flow rate ..................................................................................................... 59

6.3.4

Changing the pre-pressure of the expansion vessel...................................................................................... 61

6.3.5

To check the water volume: Examples .......................................................................................................... 62

6.4

Preparing electrical wiring .............................................................................................................................................. 62

6.4.1

About preparing electrical wiring................................................................................................................... 62

6.4.2

About preferential kWh rate power supply................................................................................................... 63

6.4.3

Overview of electrical connections except external actuators ..................................................................... 64

6.4.4

Overview of electrical connections for external and internal actuators....................................................... 64

7 Installation

7.1

Overview: Installation ..................................................................................................................................................... 66

7.2

Opening the units ........................................................................................................................................................... 66

7.2.1

About opening the units................................................................................................................................. 66

7.2.2

To open the outdoor unit............................................................................................................................... 66

7.2.3

To open the indoor unit ................................................................................................................................. 67

7.2.4

To lower the switch box on the indoor unit .................................................................................................. 69

7.3

Mounting the outdoor unit............................................................................................................................................. 70

7.3.1

About mounting the outdoor unit ................................................................................................................. 70

7.3.2

Precautions when mounting the outdoor unit .............................................................................................. 70

7.3.3

To provide the installation structure ............................................................................................................. 70

7.3.4

To install the outdoor unit ............................................................................................................................. 71

7.3.5

To provide drainage........................................................................................................................................ 71

7.3.6

To fix the fluorinated greenhouse gases label............................................................................................... 72

7.3.7

To prevent the outdoor unit from falling over .............................................................................................. 72

7.4

Mounting the indoor unit ............................................................................................................................................... 73

7.4.1

About mounting the indoor unit.................................................................................................................... 73

7.4.2

Precautions when mounting the indoor unit................................................................................................. 73

7.4.3

To install the indoor unit ................................................................................................................................ 73

7.4.4

To connect the drain hose to the drain ......................................................................................................... 74

7.5

Connecting water piping................................................................................................................................................. 75

7.5.1

About connecting the water piping ............................................................................................................... 75

7.5.2

Precautions when connecting the water piping............................................................................................ 75

7.5.3

To connect the water piping .......................................................................................................................... 75

7.5.4

To connect the water piping for domestic hot water.................................................................................... 78

7.5.5

To connect the recirculation piping ............................................................................................................... 81

7.5.6

To fill the water circuit ................................................................................................................................... 81

7.5.7

To protect the water circuit against freezing ................................................................................................ 81

7.5.8

To fill the domestic hot water tank................................................................................................................ 85

7.5.9

To insulate the water piping .......................................................................................................................... 85

7.6

Connecting the electrical wiring..................................................................................................................................... 86

7.6.1

About connecting the electrical wiring .......................................................................................................... 86

7.6.2

About electrical compliance........................................................................................................................... 86

7.6.3

Precautions when connecting the electrical wiring....................................................................................... 86

7.6.4

Guidelines when connecting the electrical wiring......................................................................................... 87

7.6.5

Specifications of standard wiring components.............................................................................................. 87

7.6.6

To connect the electrical wiring on the outdoor unit ................................................................................... 88

7.6.7

To connect the electrical wiring on the indoor unit ...................................................................................... 89

7.6.8

To connect the main power supply................................................................................................................ 91

7.6.9

To connect the backup heater power supply ................................................................................................ 92

7.6.10

To connect the shut-off valve (Heating/Cooling) .......................................................................................... 94

7.6.11

To connect the electricity meters .................................................................................................................. 95

7.6.12

To connect the domestic hot water pump .................................................................................................... 95

7.6.13

To connect the alarm output ......................................................................................................................... 95

7.6.14

To connect the space cooling/heating ON/OFF output................................................................................. 96

7.6.15

To connect the changeover to external heat source..................................................................................... 96

7.6.16

To connect the power consumption digital inputs........................................................................................ 97

7.6.17

To connect the safety thermostat (normally closed contact) ....................................................................... 97

7.7

Finishing the outdoor unit installation ........................................................................................................................... 98

7.7.1

To finish the outdoor unit installation ........................................................................................................... 98

7.8

Finishing the indoor unit installation.............................................................................................................................. 98

7.8.1

To close the indoor unit ................................................................................................................................. 98

8 Configuration

Table of contents

100

Installer reference guide

Table of Contents