To connect the user interface ........................................................................................................................ 86

8.3.4

To connect the shut-off valve ........................................................................................................................ 87

8.3.5

To connect the electricity meters .................................................................................................................. 88

8.3.6

To connect the domestic hot water pump .................................................................................................... 89

8.3.7

To connect the alarm output ......................................................................................................................... 90

8.3.8

To connect the space heating ON/OFF output.............................................................................................. 91

8.3.9

To connect the changeover to external heat source..................................................................................... 92

8.3.10

To connect the power consumption digital inputs........................................................................................ 93

8.3.11

To connect the safety thermostat (normally closed contact) ....................................................................... 94

8.4

After connecting the electrical wiring to the indoor unit .............................................................................................. 96

9 Configuration

9.1

Overview: Configuration................................................................................................................................................. 98

9.1.1

To change the user permission level ............................................................................................................. 99

9.1.2

To access the most used commands ............................................................................................................. 99

9.1.3

To copy the system settings from the first to the second user interface ..................................................... 101

9.1.4

Quick wizard: Set the system layout after first power ON ............................................................................ 102

9.2

Basic configuration.......................................................................................................................................................... 103

9.2.1

Quick wizard: Language / time and date ....................................................................................................... 103

9.2.2

Quick wizard: Standard .................................................................................................................................. 103

9.2.3

Quick wizard: Options .................................................................................................................................... 106

9.2.4

Space heating/cooling control ....................................................................................................................... 110

9.2.5

Domestic hot water control ........................................................................................................................... 113

9.2.6

Contact/helpdesk number ............................................................................................................................. 113

9.3

Weather-dependent curve ............................................................................................................................................. 114

9.3.1

What is a weather-dependent curve? ........................................................................................................... 114

9.3.2

2-points curve................................................................................................................................................. 114

9.3.3

Using weather-dependent curves.................................................................................................................. 115

9.4

Advanced configuration/optimisation............................................................................................................................ 116

9.4.1

Space heating/cooling operation: advanced ................................................................................................. 116

9.4.2

Domestic hot water control: advanced ......................................................................................................... 123

9.4.3

Heat source settings....................................................................................................................................... 128

9.4.4

System settings............................................................................................................................................... 131

9.5

Menu structure: Overview user settings........................................................................................................................ 139

9.6

Menu structure: Overview installer settings.................................................................................................................. 140

10 Commissioning

10.1

Overview: Commissioning .............................................................................................................................................. 141

10.2

Precautions when commissioning .................................................................................................................................. 141

10.3

Checklist before commissioning..................................................................................................................................... 142

10.4

Checklist during commissioning ..................................................................................................................................... 143

10.4.1

To check the minimum flow rate ................................................................................................................... 143

10.4.2

Air purge function........................................................................................................................................... 144

10.4.3

To perform a test run ..................................................................................................................................... 145

10.4.4

To perform an actuator test run .................................................................................................................... 146

10.4.5

Underfloor heating screed dryout ................................................................................................................. 146

11 Hand-over to the user

12 Maintenance and service

12.1

Overview: Maintenance and service .............................................................................................................................. 151

12.2

Maintenance safety precautions.................................................................................................................................... 151

12.3

Checklist for yearly maintenance of the outdoor unit................................................................................................... 152

12.4

Checklist for yearly maintenance of the indoor unit ..................................................................................................... 152

12.4.1

To drain the domestic hot water tank ........................................................................................................... 155

12.5

About cleaning the water filter in case of trouble ......................................................................................................... 156

12.5.1

To remove the water filter ............................................................................................................................. 156

12.5.2

To clean the water filter in case of trouble.................................................................................................... 156

12.5.3

To install the water filter ................................................................................................................................ 158

13 Troubleshooting

13.1

Overview: Troubleshooting ............................................................................................................................................ 159

13.2

Precautions when troubleshooting ................................................................................................................................ 159

13.3

Solving problems based on symptoms........................................................................................................................... 160

13.3.1

Symptom: The unit is NOT heating as expected............................................................................................ 160

13.3.2

Symptom: The compressor does NOT start (space heating or domestic water heating) ............................ 161

13.3.3

Symptom: The system is making gurgling noises after commissioning ........................................................ 161

13.3.4

Symptom: The pump is blocked..................................................................................................................... 162

13.3.5

Symptom: The pump is making noise (cavitation)......................................................................................... 162

13.3.6

Symptom: The pressure relief valve opens.................................................................................................... 162