4.2.3 Swimming pool heating .................................................................................................................................................. 23

4.2.4 Space cooling (Necessary cooling kit) ........................................................................................................................... 23

4.3

R32 Temperature working range .......................................................................................................................... 24

4.3.1 Space heating ................................................................................................................................................................ 24

4.3.2 DHW ............................................................................................................................................................................... 25

4.3.3 Swimming pool heating .................................................................................................................................................. 25

4.3.4 Space cooling (Necessary cooling kit) ........................................................................................................................... 26

4.4

R410A Hydraulic working range ........................................................................................................................... 26

4.4.1 Hydraulic data ................................................................................................................................................................ 26

4.5

R32 Hydraulic working range ............................................................................................................................... 27

4.5.1 Hydraulic data ................................................................................................................................................................ 27

4.5.2 Pump performance curves ............................................................................................................................................. 28

5 REFRIGERANT AND WATER PIPING .......................................................................................35

5.1

R32 Refrigerant circuit.......................................................................................................................................... 35

5.1.1 General notes R32 refrigerant ........................................................................................................................................ 35

5.1.2 Refrigerant piping ........................................................................................................................................................... 35

5.1.3 Refrigerant charge .......................................................................................................................................................... 37

5.2

R410A Refrigerant circuit ..................................................................................................................................... 37

5.2.1 Refrigerant piping ........................................................................................................................................................... 37

5.2.2 Precautions in the event of gas refrigerant leaks ........................................................................................................... 39

5.3

Water piping ......................................................................................................................................................... 41

5.3.1 Water piping length......................................................................................................................................................... 41

5.3.2 Water piping size ............................................................................................................................................................ 41

5.3.3 Water quality................................................................................................................................................................... 44

5.3.4 Water flow control ........................................................................................................................................................... 44

6 ELECTRICAL AND CONTROL SETTINGS ................................................................................45

6.1

General check ...................................................................................................................................................... 45

6.2

Electrical connection ............................................................................................................................................ 49

6.2.1 Wiring size ...................................................................................................................................................................... 49

6.2.2 Minimum requirements of the protection devices ........................................................................................................... 53

6.3

Terminal board connections ................................................................................................................................. 57

6.3.1 Table board 1 .................................................................................................................................................................. 57

6.3.2 Table board 2 .................................................................................................................................................................. 58

7 UNIT CONTROLLER ..................................................................................................................66

7.1

Definition of the switches...................................................................................................................................... 66

7.2

Description of the icons ........................................................................................................................................ 67

7.2.1 Common icons ............................................................................................................................................................... 67

VIII

PMML0510 rev.1 - 10/2019

Table of Contents