Viessmann Vitocal 252-A Series - Page 11

11
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Calling up messages .......................................................................... 135
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Acknowledging messages .................................................................. 135
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Calling up acknowledged messages .................................................. 135
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Troubleshooting measures ................................................................. 136
10. Indoor unit maintenance Overview of electrical terminal areas .....................................................137
Removing the programming unit and electronics module ......................137
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Removing the HMI programming unit ................................................. 137
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Removing the HPMU electronics module .......................................... 138
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Removing the EHCU electronics module ........................................... 138
Overview of internal components .......................................................... 140
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Indoor unit with 1 integrated heating/cooling circuit ............................140
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Indoor unit with 2 integrated heating/cooling circuits .......................... 141
Draining indoor unit on the secondary side ........................................... 141
Removing hydraulic components and EPP insulating parts .................. 142
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Overview of torque settings for assembly ...........................................142
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Removing the expansion vessel ......................................................... 143
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Removing the instantaneous heating water heater ............................ 144
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Removing the sensors ........................................................................ 146
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Removing the circulation pump head ................................................. 150
Status display, internal circulation pumps ..............................................150
Checking the temperature sensors ........................................................151
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Viessmann NTC 10 kΩ (blue marking) ............................................... 152
Checking the water pressure sensor ..................................................... 153
Checking the fuse .................................................................................. 153
11. Outdoor unit maintenance Removing the outer casing .................................................................... 154
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Removing the right-hand side casing ................................................. 155
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Removing the top casing .................................................................... 156
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Removing the front casing .................................................................. 158
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Removing the left-hand side casing ................................................... 160
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Removing the rear casing ...................................................................161
Overview of electrical components ........................................................ 163
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Outdoor unit with 1 fan ....................................................................... 163
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Outdoor unit with 2 fans, types ...A10 to A13 ..................................... 164
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Outdoor unit with 2 fans, types ...A16 to A19 ..................................... 165
Checklist for maintenance work .............................................................165
Overview of internal components .......................................................... 170
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Outdoor unit with 1 fan ....................................................................... 170
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Outdoor unit with 2 fans, types ...A10 to A13 ..................................... 172
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Outdoor unit with 2 fans, types ...A16 to A19 ..................................... 173
Refrigerant circuit flow diagrams ........................................................... 174
Extracting the refrigerant ....................................................................... 177
Testing pressure resistance ................................................................... 178
Filling the refrigerant circuit ....................................................................178
Draining the outdoor unit on the secondary side ................................... 179
Removing the hydraulic components .....................................................180
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Removing the float air vent valve with quick-action air vent valve ......181
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Removing the ball valve with filter ...................................................... 182
Checking the temperature sensors ........................................................182
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NTC 10 kΩ (no marking) .....................................................................183
Checking the pressure sensors ............................................................. 184
Checking the fuses ................................................................................ 184
12. Commissioning/service
reports
................................................................................................................185
13. Specification ................................................................................................................186
14. Appendix Commissioning order .............................................................................201
Final decommissioning and disposal ..................................................... 201
Index
Index
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