Viessmann AWT 221.A04, Installation And Service Instructions For Contractors

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1. Information Disposal of packaging ............................................................................ 6
Symbols ................................................................................................. 6
Intended use .......................................................................................... 6
Product information ................................................................................ 7
2. Preparing for installation Requirements for on-site connections ................................................... 8
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Recommended power cables ............................................................. 9
3. Installation sequence Installing the outdoor unit ....................................................................... 11
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Installation information ........................................................................ 11
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Installation site .................................................................................... 12
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Minimum clearances ........................................................................... 12
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Transport and siting ............................................................................ 13
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Floorstanding installation .................................................................... 14
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Wall mounting ..................................................................................... 14
Installing the indoor unit ......................................................................... 14
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Transport ............................................................................................ 14
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Installation room requirements ........................................................... 15
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Minimum clearances ........................................................................... 16
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Removing the cylinder module ........................................................... 17
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Assembly and sealing faces to note ................................................... 21
Connecting the refrigerant lines ............................................................. 23
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Routing the refrigerant lines ............................................................... 23
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Sound and vibration isolation when line entry is above ground level . 24
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Connection to outdoor unit ................................................................. 25
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Connection to indoor unit .................................................................... 26
Connecting the secondary circuit ........................................................... 29
Connecting the DHW side ..................................................................... 31
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Safety valve ........................................................................................ 31
Type AWT-AC only: connecting the cooling circuit ................................ 31
Electrical connection .............................................................................. 32
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Indoor unit: routing cables to the wiring chamber ............................... 33
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Indoor unit: overview of connections .................................................. 34
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Indoor unit: main PCB (230 V~ components) ..................................... 35
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Indoor unit: expansion PCB on main PCB (230 V~ components) ...... 37
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Indoor unit: luster terminals (signal and safety connections) .............. 37
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Indoor unit: controller and sensor PCB (LV connections) ................... 38
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Indoor unit: AVI PCB ........................................................................... 39
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Outdoor unit: overview of connections ............................................... 40
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Connecting indoor and outdoor units .................................................. 41
Power supply ......................................................................................... 41
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Heat pump control unit power supply 230 V~ ..................................... 42
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Outdoor unit power supply 230 V~/400 V~ ......................................... 42
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Connecting instantaneous heating water heater power supply .......... 44
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Power supply with power-OFF: without on-site load disconnect ........ 44
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Power supply with power-OFF: with on-site load disconnect ............. 45
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Mains power supply in conjunction with on-site power consumption . 47
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Smart Grid .......................................................................................... 47
Closing the heat pump ........................................................................... 48
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Fitting the side cover for the outdoor unit ........................................... 48
4. Commissioning, inspec-
tion, maintenance
Steps - commissioning, inspection and maintenance ............................ 49
5. Maintenance Overview of electrical components ........................................................ 67
Opening programming unit .................................................................... 67
Overview of internal components: indoor unit ........................................ 69
DHW cylinder drain & fill valve positions ............................................... 70
Overview of internal components: outdoor unit ..................................... 70
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Outdoor unit 4 kW, type AWT/AWT-AC 221.A04 ................................ 71
Index
Index
5776 028 GB