Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 10

Index
Index
4. Commissioning, inspec-
tion, maintenance
5. Troubleshooting
6. Indoor unit maintenance
7. Outdoor unit maintenance
8. Commissioning/service
reports
9. Specification
10. Appendix
10
Power supply with power-OFF: With on-site load disconnect ............ 64
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Mains power supply in conjunction with self-consumption ................. 65
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Closing the indoor unit ........................................................................... 65
Indoor unit: Fitting the front panel ....................................................... 66
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Steps - commissioning, inspection and maintenance ............................ 67
Message display on the programming unit ............................................ 94
Fault messages ..................................................................................... 95
Warning messages ................................................................................ 113
Further messages .................................................................................. 117
Service messages .............................................................................. 117
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Status messages ................................................................................ 117
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Information .......................................................................................... 118
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Overview of electrical terminal areas .....................................................121
Removing the programming unit and electronics module ......................121
Removing the HMI programming unit ................................................. 121
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Removing the HPMU electronics module .......................................... 121
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Removing the EHCU electronics module ........................................... 122
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Overview of internal components .......................................................... 124
Draining indoor unit on the secondary side ........................................... 124
Removing hydraulic components and EPP insulating parts .................. 124
Overview of torque settings for assembly ...........................................125
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Removing the expansion vessel ......................................................... 126
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Removing the instantaneous heating water heater ............................ 127
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Removing the sensors ........................................................................ 129
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Removing the circulation pump head ................................................. 132
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Status display, internal circulation pump ................................................132
Checking the temperature sensors ........................................................133
Viessmann NTC 10 k
Ω
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Checking the pressure sensors ............................................................. 135
Checking the fuse .................................................................................. 135
Overview of electrical components ........................................................ 136
Checklist for maintenance work .............................................................136
Overview of internal components .......................................................... 141
Refrigerant circuit flowchart ................................................................... 143
Heating mode ..................................................................................... 143
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Cooling mode ..................................................................................... 144
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Extracting the refrigerant ....................................................................... 145
Testing pressure resistance ................................................................... 146
Filling the refrigerant circuit ....................................................................146
Draining the outdoor unit on the secondary side ................................... 147
Removing the hydraulic components .....................................................148
Removing the float air vent valve with quick-action air vent valve ......148
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Removing the ball valve with filter ...................................................... 149
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Checking the temperature sensors ........................................................150
NTC 10 k (no marking) ..................................................................... 151
Ω
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Checking the pressure sensors ............................................................. 152
Checking the fuses ................................................................................ 152
................................................................................................................153
................................................................................................................154
Commissioning order .............................................................................164
Final decommissioning and disposal ..................................................... 164
(blue marking) ............................................... 134