DOC AIRBUS | AMM A320FPOTABLE WATER ICE PROTECTION - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
The potable-water ice protection is installed to prevent ice formation in the potable water system.
Ice formation in the potable water lines can cause a blockage or damage to the water lines.
The potable water lines have an insulation, where the icing conditions can occur are heated by electrical tape heaters.
A control unit through the temperature sensors controls the operation of the electrical tape heaters.
The waste water from the galley and lavatory wash basins is discarded through the waste-water drain lines and drain masts to atmosphere.
** ON A/C NOT FOR ALL The potable-water ice protection is installed to prevent ice formation in the potable water system.
Ice formation in the potable water lines can cause a blockage or damage to the water lines.
The potable water lines have an insulation, where the icing conditions can occur are heated by electrical tape heaters.
A control unit through the temperature sensors controls the operation of the electrical tape heaters.
The waste water from the galley and lavatory wash basins is discarded through the waste-water drain lines and drain masts to atmosphere.
2. Component Location
Potable-Water Ice-Protection - Component Location ** ON A/C NOT FOR ALL
Potable-Water Ice-Protection - Component Location ** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL | ------------------------------------------------------------------------------- |
| FIN ! FUNCTIONAL DESIGNATION ! PANEL ! ZONE ! ACCESS! ATA |
| ! ! ! ! DOOR ! REF |
| ------------------------------------------------------------------------------- |
| 3DW UNIT-CTL 132 825 30-73-34 |
| 4DW TAPE-HEATER 131 825 30-73-53 |
| 10DW SENSOR 121 30-73-00 |
| 16DW TAPE-HEATER 131 825 30-73-53 |
| 23DW UNIT-CTL 132 825 30-73-34 |
| 24DW HEATER-INNERLINE 221 30-73-54 |
| 25DW HEATER-INNERLINE 127 30-73-54 |
| 29DW SENSOR 131 30-73-00 |
| 30DW SENSOR 192 30-73-00 |
| 33DW UNIT-CTL 152 826 30-73-00 |
| 34DW TAPE-HEATER 172 30-73-00 |
| 35DW TAPE-HEATER 171 30-73-00 |
| 36DW TAPE-HEATER 171 30-73-00 |
| 40DW SENSOR 171 30-73-00 |
| 41DW TAPE-HEATER 172 30-73-00 |
| 43DW TAPE-HEATER 171 30-73-00 |
| 53DW UNIT-CTL 152 826 30-73-00 |
| 70DW SENSOR 171 30-73-00 |
| 71DW TAPE-HEATER 171 30-73-00 |
| 72DW TAPE-HEATER 171 30-73-00 |
| 73DW TAPE-HEATER 171 30-73-00 |
| 74DW TAPE-HEATER 171 30-73-00 |
| 75DW TAPE-HEATER 171 30-73-00 |
| 76DW TAPE-HEATER 171 30-73-00 |
| 77DW TAPE-HEATER 171 30-73-00 |
| 81DW TAPE-HEATER 172 30-73-00 |
| 82DW TAPE-HEATER 171 30-73-00 |
| 83DW TAPE-HEATER 171 30-73-00 |
| 84DW TAPE-HEATER 171 30-73-00 |
| 90DW SENSOR 152 30-73-00 |
| 91DW-1 VALVE-HEATER 152 30-73-00 |
| 91DW-2 VALVE-HEATER 152 30-73-00 |
| 91DW-3 VALVE-HEATER 152 30-73-00 |
| 91DW-4 VALVE-HEATER 152 30-73-00 |
| 333DW TAPE-HEATER 170 30-73-00 |
| 334DW TAPE-HEATER 170 30-73-00 |
| 335DW TAPE-HEATER 131 30-73-00 |
| 337DW TAPE-HEATER 170 30-73-00 |
| ------------------------------------------------------------------------------- |
| FIN ! FUNCTIONAL DESIGNATION ! PANEL ! ZONE ! ACCESS! ATA |
| ! ! ! ! DOOR ! REF |
| ------------------------------------------------------------------------------- |
| 3DW CONTROL UNIT, POTABLE WATERICE 132 825 30-73-34 |
| 4DW HEATER ELEMENT-POTABLE WATER DE 131 825 30-73-53 |
| 10DW SENSOR,TEMPERATURE- 131 825 30-73-17 |
| 16DW HEATER-TAPE, 131 825 30-73-53 |
| 23DW CONTROL UNIT, POTABLE WATERICE PROTE 132 825 30-73-34 |
| 24DW INNERLINE-HEATER, 222 825 30-73-54 |
| 25DW INNERLINE-HEATER, 127 825 30-73-54 |
| 29DW SENSOR,TEMPERATURE- 131 825 30-73-18 |
| 33DW CONTROL UNIT, POTABLE WATERICE 152 826 30-73-35 |
| 34DW HEATER-TAPE, 171 826 30-73-00 |
| 35DW HEATER-TAPE, 171 826 30-73-00 |
| 36DW HEATER-TAPE, 171 826 30-73-53 |
| 40DW SENSOR,TEMPERATURE- 171 826 30-73-19 |
| 41DW HEATER-TAPE, 171 826 30-73-00 |
| 53DW CONTROL UNIT, POTABLE WATERICE PROTE 152 826 30-73-35 |
| 70DW SENSOR,TEMPERATURE- 171 826 30-73-18 |
| 71DW HEATER-TAPE, 171 826 30-73-00 |
| 72DW HEATER-TAPE, 171 826 30-73-00 |
| 75DW HEATER-TAPE, 171 826 30-73-00 |
| 76DW HEATER-TAPE, 171 826 30-73-00 |
| 77DW HEATER-TAPE, 171 826 30-73-00 |
| 81DW HEATER-TAPE, 172 826 30-73-00 |
| 82DW HEATER-TAPE, 172 826 30-73-53 |
| 83DW HEATER-TAPE, 172 826 30-73-53 |
| 84DW HEATER-TAPE, 172 826 30-73-53 |
| 90DW SENSOR,TEMPERATURE- 170 826 30-73-18 |
| 91DW-1 VALVE-HEATER, 170 826 30-73-56 |
| 91DW-2 VALVE-HEATER, 170 826 30-73-56 |
| 91DW-3 VALVE-HEATER, 170 826 30-73-56 |
| 91DW-4 VALVE-HEATER, 170 826 30-73-56 |
| 92DW HEATER-TAPE, 171 826 30-73-17 |
| 93DW HEATER-TAPE, 171 826 30-73-00 |
| 94DW HEATER-TAPE, 171 826 30-73-00 |
| 96DW HEATER-TAPE, 171 826 30-73-53 |
| 97DW HEATER-TAPE, 171 826 30-73-00 |
| 110DW SENSOR,TEMPERATURE- 170 825 30-73-18 |
| 112DW HEATER-TAPE, 172 825 30-73-53 |
| 300DW SENSOR,TEMPERATURE- 131 825 30-73-17 |
| 311DW HEATER ELEMENT 131 825 30-73-53 |
| 321DW HEATER TAPE 131 825 30-73-53 |
| 322DW HEATER TAPE 131 825 30-73-53 |
| 323DW HEATER TAPE 131 825 30-73-53 |
| 331DW HEATER ELEMENT 131 825 30-73-53 |
| 332DW HEATER ELEMENT 131 825 30-73-53 |
| 333DW HEATER TAPE 131 825 30-73-53 |
| 334DW HEATER TAPE 131 826 30-73-53 |
| 337DW HEATER-TAPE, 131 826 30-73-53 |
| 338DW HEATER-TAPE, 131 826 30-73-00 |
| 365DW HEATER-TAPE, 131 825 30-73-00 |
| 371DW HEATER-TAPE, 171 826 30-73-00 |
| 372DW HEATER-TAPE, 171 826 30-73-00 |
| 373DW HEATER-TAPE, 171 825 30-73-00 |
Potable-Water Ice-Protection - Component Location ** ON A/C NOT FOR ALL Potable-Water Ice-Protection - Component Location ** ON A/C NOT FOR ALL | ------------------------------------------------------------------------------- |
| FIN ! FUNCTIONAL DESIGNATION ! PANEL ! ZONE ! ACCESS! ATA |
| ! ! ! ! DOOR ! REF |
| ------------------------------------------------------------------------------- |
| 3DW UNIT-CTL 132 825 30-73-34 |
| 4DW TAPE-HEATER 131 825 30-73-53 |
| 8DW TAPE-HEATER 131 825 30-73-55 |
| 9DW TAPE-HEATER 131 825 30-73-53 |
| 10DW SENSOR 131 825 30-73-17 |
| 16DW TAPE-HEATER 131 825 30-73-53 |
| 23DW UNIT-CTL 132 825 30-73-34 |
| 24DW HEATER-INNERLINE 221 30-73-54 |
| 25DW HEATER-INNERLINE 127 30-73-54 |
| 26DW TAPE-HEATER 192 30-73-00 |
| 27DW TAPE-HEATER 192 30-73-00 |
| 28DW TAPE-HEATER 192 30-73-00 |
| 29DW SENSOR 121 30-73-00 |
| 30DW SENSOR 192 30-73-00 |
| 33DW UNIT-CTL 152 826 30-73-00 |
| 34DW TAPE-HEATER 171 30-73-00 |
| 35DW TAPE-HEATER 171 30-73-00 |
| 36DW TAPE-HEATER 171 30-73-00 |
| 40DW SENSOR 171 30-73-00 |
| 41DW TAPE-HEATER 172 30-73-00 |
| 42DW TAPE-HEATER 171 30-73-00 |
| 43DW TAPE-HEATER 171 30-73-00 |
| 53DW UNIT-CTL 152 826 30-73-00 |
| 54DW TAPE-HEATER 145 30-73-00 |
| 55DW TAPE-HEATER 145 30-73-00 |
| 56DW TAPE-HEATER 151 30-73-00 |
| 57DW TAPE-HEATER 161 30-73-00 |
| 58DW TAPE-HEATER 161 30-73-00 |
| 59DW TAPE-HEATER 145 30-73-00 |
| 60DW SENSOR 145 30-73-00 |
| 61DW SENSOR 161 30-73-00 |
| 126DW TAPE-HEATER 192 30-73-00 |
| 127DW TAPE-HEATER 192 30-73-00 |
| 158DW TAPE-HEATER 161 30-73-00 |
| 365DW TAPE-HEATER 131 30-73-00 |
| ------------------------------------------------------------------------------- |
| FIN ! FUNCTIONAL DESIGNATION ! PANEL ! ZONE ! ACCESS! ATA |
| ! ! ! ! DOOR ! REF |
| ------------------------------------------------------------------------------- |
| 3DW UNIT-CTL 132 825 30-73-34 |
| 4DW TAPE-HEATER 131 825 30-73-55 |
| 10DW SENSOR 131 825 30-73-17 |
| 16DW TAPE-HEATER 131 825 30-73-55 |
| 23DW UNIT-CTL 132 825 30-73-34 |
| 24DW HEATER-INNERLINE 221 825 30-73-54 |
| 25DW HEATER-INNERLINE 127 825 30-73-54 |
| 29DW SENSOR 131 825 30-73-18 |
| 33DW UNIT-CTL 152 826 30-73-34 |
| 34DW TAPE-HEATER 172 826 30-73-55 |
| 35DW TAPE-HEATER 171 826 30-73-55 |
| 36DW TAPE-HEATER 171 826 30-73-55 |
| 40DW SENSOR 171 826 30-73-19 |
| 43DW TAPE-HEATER 171 826 30-73 55 |
| 53DW UNIT-CTL 152 826 30-73-34 |
| 70DW SENSOR 171 826 30-73-19 |
| 71DW TAPE-HEATER 171 826 30-73-55 |
| 72DW TAPE-HEATER 171 826 30-73-55 |
| 75DW TAPE-HEATER 171 826 30-73-55 |
| 76DW TAPE-HEATER 171 826 30-73-55 |
| 82DW TAPE-HEATER 171 826 30-73-55 |
| 83DW TAPE-HEATER 171 826 30-73-55 |
| 84DW TAPE-HEATER 171 826 30-73-55 |
| 86DW TAPE-HEATER 171 826 30-73-55 |
| 87DW TAPE-HEATER 171 826 30-73-55 |
| 88DW TAPE-HEATER 171 826 30-73-55 |
| 89DW TAPE-HEATER 172 826 30-73-55 |
| 90DW SENSOR 170 826 30-73-19 |
| 91DW-1 HEATER-VALVE 170 826 30-73-56 |
| 91DW-2 HEATER-VALVE 170 826 30-73-56 |
| 91DW-3 HEATER-VALVE 170 826 30-73-56 |
| 91DW-4 HEATER-VALVE 170 826 30-73-56 |
| 110DW SENSOR 170 826 30-73-19 |
| 111DW TAPE-HEATER 172 826 30-73-55 |
| 112DW TAPE-HEATER 171 826 30-73-55 |
| 300DW SENSOR 131 825 30-73-17 |
| 311DW TAPE-HEATER 131 825 30-73-55 |
| 321DW TAPE-HEATER 131 825 30-73-55 |
| 322DW TAPE-HEATER 131 825 30-73-55 |
| 323DW TAPE-HEATER 131 825 30-73-55 |
| 331DW TAPE-HEATER 131 825 30-73-55 |
| 332DW TAPE-HEATER 131 825 30-73-55 |
| 333DW TAPE-HEATER 131 825 30-73-55 |
| 334DW TAPE-HEATER 131 826 30-73-55 |
| 337DW TAPE-HEATER 171 826 30-73-55 |
| 338DW TAPE-HEATER 171 826 30-73-55 |
| 365DW TAPE-HEATER 131 825 30-73-55 |
| FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE | ACCESS DOOR | ATA REF |
|---|---|---|---|---|---|
| ** ON A/C ALL | |||||
| 3DW | CONTROL UNIT, POTABLE WATERICE PROTECTION- | 132 | 30-73-34 | ||
| 4DW | HEATER ELEMENT-POTABLE WATER DE ICING | 131 | 30-73-53 | ||
| ** ON A/C NOT FOR ALL | |||||
| 335DW | HEATER-TAPE | 131 | 30-73-00 | ||
| ** ON A/C NOT FOR ALL | |||||
| 8DW | HEATER-TAPE, | 131 | 30-73-53 | ||
| ** ON A/C NOT FOR ALL | |||||
| 9DW | HEATER-TAPE, | 131 | 30-73-53 | ||
| ** ON A/C ALL | |||||
| 10DW | SENSOR,TEMPERATURE- | 131 | 30-73-17 | ||
| 16DW | HEATER-TAPE, | 131 | 30-73-00 | ||
| ** ON A/C NOT FOR ALL | |||||
| 23DW | CONTROL UNIT, POTABLE WATERICE PROTECTION- | 132 | 30-73-34 | ||
| ** ON A/C NOT FOR ALL | |||||
| 24DW | INNERLINE-HEATER, | 221 | 30-73-54 | ||
| ** ON A/C NOT FOR ALL | |||||
| 24DW | INNERLINE-HEATER, | 222 | 30-73-54 | ||
| ** ON A/C NOT FOR ALL | |||||
| 25DW | INNERLINE-HEATER, | 127 | 30-73-54 | ||
| ** ON A/C NOT FOR ALL | |||||
| 26DW | HEATER-TAPE | 131 | 30-73-53 | ||
| 27DW | HEATER-TAPE, | 131 | 30-73-00 | ||
| 28DW | TAPE-HEATER | 131 | 30-73-00 | ||
| ** ON A/C NOT FOR ALL | |||||
| 29DW | SENSOR,TEMPERATURE- | 131 | 30-73-18 | ||
| ** ON A/C NOT FOR ALL | |||||
| 30DW | SENSOR,TEMPERATURE- | 192 | 30-73-19 | ||
| ** ON A/C NOT FOR ALL | |||||
| 33DW | CONTROL UNIT, POTABLE WATERICE PROTECTION- | 152FW | 152 | 30-73-35 | |
| ** ON A/C NOT FOR ALL | |||||
| 33DW | CONTROL UNIT, POTABLE WATERICE PROTECTION- | 152 | 30-73-35 | ||
| ** ON A/C NOT FOR ALL | |||||
| 34DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| 35DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| 36DW | HEATER-TAPE, | 171 | 30-73-53 | ||
| 40DW | SENSOR,TEMPERATURE- | 171 | 30-73-19 | ||
| ** ON A/C NOT FOR ALL | |||||
| 41DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| ** ON A/C NOT FOR ALL | |||||
| 42DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| ** ON A/C NOT FOR ALL | |||||
| 43DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| ** ON A/C NOT FOR ALL | |||||
| 53DW | CONTROL UNIT, POTABLE WATERICE PROTECTION- | 152FW | 152 | 30-73-35 | |
| ** ON A/C NOT FOR ALL | |||||
| 54DW | TAPE-HEATER | 140 | 30-73-53 | ||
| 55DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| 56DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| 57DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| 58DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| 59DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| 60DW | SENSOR,TEMPERATURE- | 145 | 30-73-19 | ||
| 61DW | SENSOR,TEMPERATURE- | 171 | 30-73-19 | ||
| ** ON A/C NOT FOR ALL | |||||
| 70DW | SENSOR,TEMPERATURE- | 171 | 30-73-18 | ||
| 71DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| 72DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| ** ON A/C NOT FOR ALL | |||||
| 73DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| 74DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| ** ON A/C NOT FOR ALL | |||||
| 75DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| 76DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| ** ON A/C NOT FOR ALL | |||||
| 77DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| ** ON A/C NOT FOR ALL | |||||
| 78DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| 79DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| ** ON A/C NOT FOR ALL | |||||
| 81DW | HEATER-TAPE, | 172 | 30-73-00 | ||
| ** ON A/C NOT FOR ALL | |||||
| 82DW | HEATER-TAPE, | 172 | 30-73-53 | ||
| 83DW | HEATER-TAPE, | 172 | 30-73-53 | ||
| 84DW | HEATER-TAPE, | 172 | 30-73-53 | ||
| ** ON A/C NOT FOR ALL | |||||
| 86DW | HEATER-TAPE, | 171 | 30-73-53 | ||
| 87DW | HEATER-TAPE, | 171 | 30-73-53 | ||
| 88DW | HEATER-TAPE, | 171 | 30-73-53 | ||
| 89DW | HEATER-TAPE, | 171 | 30-73-53 | ||
| ** ON A/C NOT FOR ALL | |||||
| 90DW | SENSOR,TEMPERATURE- | 170 | 30-73-18 | ||
| 91DW1 | VALVE-HEATER, | 170 | 30-73-56 | ||
| 91DW2 | VALVE-HEATER, | 170 | 30-73-56 | ||
| 91DW3 | VALVE-HEATER, | 170 | 30-73-56 | ||
| 91DW4 | VALVE-HEATER, | 170 | 30-73-56 | ||
| ** ON A/C NOT FOR ALL | |||||
| 92DW | HEATER-TAPE, | 171 | 30-73-17 | ||
| 93DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| 94DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| 96DW | HEATER-TAPE, | 171 | 30-73-53 | ||
| ** ON A/C NOT FOR ALL | |||||
| 97DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| ** ON A/C NOT FOR ALL | |||||
| 111DW | HEATER-TAPE, | 172 | 30-73-53 | ||
| ** ON A/C NOT FOR ALL | |||||
| 110DW | SENSOR,TEMPERATURE- | 170 | 30-73-18 | ||
| 112DW | HEATER-TAPE, | 172 | 30-73-53 | ||
| ** ON A/C NOT FOR ALL | |||||
| 113DW | HEATER-TAPE, | 172 | 30-73-53 | ||
| ** ON A/C NOT FOR ALL | |||||
| 126DW | HEATER-TAPE, | 131 | 30-73-00 | ||
| 127DW | HEATER-TAPE, | 131 | 30-73-00 | ||
| 158DW | HEATER-TAPE, | 171 | 30-73-53 | ||
| ** ON A/C NOT FOR ALL | |||||
| 300DW | SENSOR,TEMPERATURE- | 131 | 30-73-17 | ||
| 311DW | HEATER ELEMENT | 131 | 30-73-00 | ||
| 321DW | HEATER TAPE | 131 | 30-73-00 | ||
| 322DW | HEATER-TAPE | 131 | 30-73-00 | ||
| 323DW | HEATER-TAPE | 131 | 30-73-00 | ||
| ** ON A/C NOT FOR ALL | |||||
| 333DW | HEATER-TAPE, | 131 | 30-73-53 | ||
| ** ON A/C NOT FOR ALL | |||||
| 337DW | HEATER-TAPE, | 131 | 30-73-53 | ||
| ** ON A/C NOT FOR ALL | |||||
| 334DW | HEATER-TAPE, | 131 | 30-73-53 | ||
| ** ON A/C NOT FOR ALL | |||||
| 338DW | HEATER-TAPE, | 131 | 30-73-00 | ||
| ** ON A/C NOT FOR ALL | |||||
| 331DW | HEATER ELEMENT | 131 | 30-73-00 | ||
| 332DW | HEATER ELEMENT | 131 | 30-73-00 | ||
| ** ON A/C NOT FOR ALL | |||||
| 333DW | HEATER-TAPE, | 171 | 30-73-53 | ||
| ** ON A/C NOT FOR ALL | |||||
| 365DW | HEATER-TAPE, | 131 | 30-73-00 | ||
| ** ON A/C NOT FOR ALL | |||||
| 371DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| 372DW | HEATER-TAPE, | 171 | 30-73-00 | ||
| 373DW | HEATER-TAPE, | 171 | 30-73-00 | ||
3. System Description
The potable water line, installed in the forward and aft sections of the aircraft in zones where possibly icing conditions can occur, is electrically heated by heater assemblies. The potable water line is attached to water line supports, and tightened with clamps. The heater assemblies are attached to the potable water line with a bonding tape. The potable water line has an additional insulation installed to cover the heated lines.
The control units, located in the forward and aft cargo compartment, control and monitor the heater circuits. Each heater circuit is protected by a fuse, installed in its related control unit. The control unit controls and monitors the heater assembly. The temperature sensors are connected to the control unit which constantly measure the temperature on the potable water line.
If icing condition occurs, the control unit turns on the heater assembly.
The potable water line installed in the forward and aft sections of the aircraft in zones where possible icing conditions can occur, is electrically heated by heater assemblies. The potable water line is attached to water line supports and tightened with clamps. The heater assemblies are attached to the potable water line with a bonding tape. The potable water line has an additional insulation installed to cover the heated lines.
For long distance flights of high altitude and in low temperature conditions, additional heater elements are installed on the fill/overflow drain valve and overflow pipes of the potable water tank.
The control units, located in the forward and aft cargo compartment, control and monitor the heater circuits. Each heater circuit is protected by a fuse, installed in its related control unit. The control unit controls and monitors the heater assembly. The temperature sensors are connected to the control unit which continuously measures the temperature on the potable water line.
If icing condition occurs, the control unit turns on the heater assembly.
** ON A/C NOT FOR ALL The potable water line, installed in the forward and aft sections of the aircraft in zones where possibly icing conditions can occur, is electrically heated by heater assemblies. The potable water line is attached to water line supports, and tightened with clamps. The heater assemblies are attached to the potable water line with a bonding tape. The potable water line has an additional insulation installed to cover the heated lines.
The control units, located in the forward and aft cargo compartment, control and monitor the heater circuits. Each heater circuit is protected by a fuse, installed in its related control unit. The control unit controls and monitors the heater assembly. The temperature sensors are connected to the control unit which constantly measure the temperature on the potable water line.
If icing condition occurs, the control unit turns on the heater assembly.
The potable water line installed in the forward and aft sections of the aircraft in zones where possible icing conditions can occur, is electrically heated by heater assemblies. The potable water line is attached to water line supports and tightened with clamps. The heater assemblies are attached to the potable water line with a bonding tape. The potable water line has an additional insulation installed to cover the heated lines.
For long distance flights of high altitude and in low temperature conditions, additional heater elements are installed on the fill/overflow drain valve and overflow pipes of the potable water tank.
The control units, located in the forward and aft cargo compartment, control and monitor the heater circuits. Each heater circuit is protected by a fuse, installed in its related control unit. The control unit controls and monitors the heater assembly. The temperature sensors are connected to the control unit which continuously measures the temperature on the potable water line.
If icing condition occurs, the control unit turns on the heater assembly.
4. Power Supply
GND/FLT busbar 212XP-C supplies 115VAC to the potable-water system heater-assemblies.
GND/FLT busbar 602PP supplies 28VDC to control unit 3DW.
The subsequent circuit breakers installed on CB panel 2000VU:
The GND/FLT busbar 212XP-C supplies 115VAC to the heater-assemblies and the inner line heaters aft of the aircraft.
The GND/FLT busbar 602PP supplies 28VDC to the control units.
The subsequent circuit breakers installed on CB panel 2000VU:
GND/FLT busbar 602PP supplies 28VDC to control unit 3DW.
GND/FLT busbar 212XP-C supplies 115VAC to control unit 23DW and inner line heaters 24DW and 25DW.
The subsequent circuit breakers for the aft section are installed on CB panel 2001VU zone 263:
GND/FLT busbar 602PP supplies 28VDC to control unit 33DW.
GND/FLT busbar 212XP-C supplies 115VAC to control unit 53DW and aft potable-water-system valve heater-assembly HTR I.
Potable-Water Ice-Protection - Electrical Schematic ** ON A/C NOT FOR ALL
Potable-Water Ice-Protection - Electrical Schematic ** ON A/C NOT FOR ALL
Potable-Water Ice-Protection - Electrical Schematic ** ON A/C NOT FOR ALL
GND/FLT busbar 212XP-C supplies 115VAC to control unit 3DW and the heater assemblies of the forward potable-water system.
GND/FLT busbar 214XP-C supplies 115VAC to control unit 23DW, forward potable-water system and innerline heaters.
GND/FLT busbar 602PP supplies 28VDC to control units 3DW and 23DW.
The circuit breakers which follow are installed on circuit breaker panel 2000VU:
GND/FLT busbar 212XP-C supplies 115VAC to control unit 53DW and the valve heater assembly of the aft potable-water system.
GND/FLT busbar 602PP supplies 28VDC to control units 33DW and 53DW.
The circuit breakers which follow are installed on circuit breaker panel 2001VU:
** ON A/C NOT FOR ALL GND/FLT busbar 212XP-C supplies 115VAC to the potable-water system heater-assemblies.
GND/FLT busbar 602PP supplies 28VDC to control unit 3DW.
The subsequent circuit breakers installed on CB panel 2000VU:
- 1DW
- 2DW.
The GND/FLT busbar 212XP-C supplies 115VAC to the heater-assemblies and the inner line heaters aft of the aircraft.
The GND/FLT busbar 602PP supplies 28VDC to the control units.
The subsequent circuit breakers installed on CB panel 2000VU:
- 1DW
- 2DW
- 21DW
The subsequent circuit breakers installed on CB panel 2001VU: - 32DW
- 31DW
- 51DW
- 1DW
- 2DW
- 21DW
GND/FLT busbar 602PP supplies 28VDC to control unit 3DW.
GND/FLT busbar 212XP-C supplies 115VAC to control unit 23DW and inner line heaters 24DW and 25DW.
The subsequent circuit breakers for the aft section are installed on CB panel 2001VU zone 263:
- 31DW
- 32DW
- 51DW
GND/FLT busbar 602PP supplies 28VDC to control unit 33DW.
GND/FLT busbar 212XP-C supplies 115VAC to control unit 53DW and aft potable-water-system valve heater-assembly HTR I.
Potable-Water Ice-Protection - Electrical Schematic ** ON A/C NOT FOR ALL Potable-Water Ice-Protection - Electrical Schematic ** ON A/C NOT FOR ALL Potable-Water Ice-Protection - Electrical Schematic ** ON A/C NOT FOR ALL GND/FLT busbar 214XP-C supplies 115VAC to control unit 23DW, forward potable-water system and innerline heaters.
GND/FLT busbar 602PP supplies 28VDC to control units 3DW and 23DW.
The circuit breakers which follow are installed on circuit breaker panel 2000VU:
- 1DW
- 2DW
- 21DW.
GND/FLT busbar 212XP-C supplies 115VAC to control unit 53DW and the valve heater assembly of the aft potable-water system.
GND/FLT busbar 602PP supplies 28VDC to control units 33DW and 53DW.
The circuit breakers which follow are installed on circuit breaker panel 2001VU:
- 31DW
- 32DW
- 51DW.
5. Operation/Control and Indicating
Potable-Water Ice-Protection - Electrical Schematic ** ON A/C NOT FOR ALL
Potable-Water Ice-Protection - Electrical Schematic ** ON A/C NOT FOR ALL
The potable-water ice-protection system operates when the busbars 212XP-C 115VAC and 602PP 28VDC are energized and circuit breakers 1DW and 2DW are closed.
You cannot control the system manually.
The system operates automatically on the ground and/or in the flight mode.
Control unit 3DW controls the operation of the related sensors and heaters.
When the sensors detect icing conditions (this depends on stored temperature threshold in the control unit), the control unit will supply electrical power (115VAC) to the heater assemblies.
The control adjustments for the heaters are:
The BITE test function monitors the correct function of:
Two Light Emitting Diodes (LED) show the correct status of the system.
The forward potable-water ice-protection system operates when busbars 212XP-C, 214XP-C and 602PP are energized and circuit breakers 1DW, 2DW, and 21DW are closed.
Control units 3DW and 23DW control the operation of the forward potable-water ice-protection system and the innerline heaters to galley I, galley II and toilet A.
The aft potable water ice protection system operates when busbars 212XP-C and 602PP are energized and the circuit breakers 31DW, 32DW and 51DW are closed.
Control unit 33DW controls the operation of the aft potable-water ice-protection heater system.
Control unit 53DW controls the operation of the aft fill-drain valve heaters.
You cannot control the system manually.
When the sensors detect icing conditions (depends on the stored temperature thresholds in the control unit), the control units will supply electrical power (115VAC) to the heater circuits and innerline heaters.
The control thresholds for the heater circuits are:
Two Light Emiting Diodes (LED) show the correct status of the system.
The forward potable-water ice-protection system operates when the busbars 212XP-C, 214XP-C and 602PP are energized and the circuit breakers 1DW, 2DW, and 21DW are closed.
The control units 3DW and 23DW control the operation of the forward potable-water ice-protection system and the inner line heaters to galley 1 and toilet A.
The aft potable-water ice-protection system operates when the busbars 212XP-C, 214XP-C and 602PP are energized and the circuit breakers 31DW, 32DW and 51DW are closed.
The control unit 33DW control the operation of the aft potable-water ice-protection system.
The control unit 53DW control the operation of the aft fill-drain valve heaters.
You cannot control the system manually.
When the sensors detect icing conditions (depends on the stored temperature thresholds in the control unit), the control units will supply electrical power (115VAC) to the heater circuits and inner line heaters.
The control thresholds for the heater circuits are:
The Light Emitting Diodes (LED) show the correct status of the system.
The forward potable-water ice-protection-system operates when busbars 212XP-C, 214XP-C and 602PP are energized and circuit breakers 1DW, 2DW and 21DW are closed.
The control units 3DW and 23DW control the operation of the forward potable-water ice-protection-system and the innerline heaters to galley I and toilet A.
The aft potable-water ice-protection-system operates when busbars 212XP-C and 602PP are energized and the circuit breakers 31DW, 32DW and 51DW are closed.
Control unit 33DW controls the operation of the aft-potable-water ice-protection heater-system.
Control unit 53DW controls the operation of the aft-potable-water ice-protection heater-system and the aft fill and drain valve heaters.
You cannot control the system manually.
When the sensors detect icing conditions (in relation to the stored temperature thresholds in the control unit), the control units will supply electrical power (115VAC) to the heater circuits, innerline heaters and valve heaters.
The control thresholds for the heater circuits are:
The BITE test function monitors the correct function of:
Two Light Emitting Diodes (LED) show the correct status of the system.
The forward potable-water ice-protection system operates when busbars 212XP-C, 214XP-C and 602PP are energized and circuit breakers 1DW, 2DW and 21DW are closed.
Control units 3DW and 23DW control the operation of the forward potable-water ice-protection system and the inner line heaters of galley I and toilet A.
The aft potable-water ice-protection system operates when busbars 212XP-C and 602PP are energized and circuit breakers 31DW, 32DW and 51DW are closed.
Control units 33DW and 53DW control the operation of the aft potable-water ice-protection system.
You cannot control the system manually.
When the sensors detect the icing conditions (in relation to the reference temperature in the control unit), the control units will supply electrical power (115VAC) to the heater circuits and the inner line heaters.
The operational temperature for the heater circuits is:
The BITE test function monitors the correct function of:
Two Light Emitting Diodes (LEDs) show the correct status of the system.
Potable-Water Ice-Protection - Electrical Schematic ** ON A/C NOT FOR ALL Potable-Water Ice-Protection - Electrical Schematic ** ON A/C NOT FOR ALL You cannot control the system manually.
The system operates automatically on the ground and/or in the flight mode.
Control unit 3DW controls the operation of the related sensors and heaters.
When the sensors detect icing conditions (this depends on stored temperature threshold in the control unit), the control unit will supply electrical power (115VAC) to the heater assemblies.
The control adjustments for the heaters are:
- Heaters ON < 6.0 +1 -1 deg.C (42.80 +1.80 -1.80 deg.F)
- Heaters OFF > 10.0 +1 -1 deg.C (50.00 +1.80 -1.80 deg. F).
The BITE test function monitors the correct function of:
- The control and monitor circuits
- The connected heater circuits (tapes)
- The connected temperature sensor
- The internal solid states relays
- The power supply of the system
- The interface connector.
Two Light Emitting Diodes (LED) show the correct status of the system.
The forward potable-water ice-protection system operates when busbars 212XP-C, 214XP-C and 602PP are energized and circuit breakers 1DW, 2DW, and 21DW are closed.
Control units 3DW and 23DW control the operation of the forward potable-water ice-protection system and the innerline heaters to galley I, galley II and toilet A.
The aft potable water ice protection system operates when busbars 212XP-C and 602PP are energized and the circuit breakers 31DW, 32DW and 51DW are closed.
Control unit 33DW controls the operation of the aft potable-water ice-protection heater system.
Control unit 53DW controls the operation of the aft fill-drain valve heaters.
You cannot control the system manually.
When the sensors detect icing conditions (depends on the stored temperature thresholds in the control unit), the control units will supply electrical power (115VAC) to the heater circuits and innerline heaters.
The control thresholds for the heater circuits are:
- Heaters ON < 6.0 +1 -1 deg.C (42.80 +1.80 -1.80 deg.F)
- Heaters OFF > 10.0 +1 -1 deg.C (50.00 +1.80 -1.80 deg.F).
The control unit(s) of the potable-water ice-protection is (are) provided with a internal BITE test.
The BITE test function monitors the correct function of: - The control and monitor circuits
- The connected heater circuits (tapes)
- The connected temperature sensor
- The internal solid states relays
- The power supply of the system
- The interface connector.
Two Light Emiting Diodes (LED) show the correct status of the system.
The forward potable-water ice-protection system operates when the busbars 212XP-C, 214XP-C and 602PP are energized and the circuit breakers 1DW, 2DW, and 21DW are closed.
The control units 3DW and 23DW control the operation of the forward potable-water ice-protection system and the inner line heaters to galley 1 and toilet A.
The aft potable-water ice-protection system operates when the busbars 212XP-C, 214XP-C and 602PP are energized and the circuit breakers 31DW, 32DW and 51DW are closed.
The control unit 33DW control the operation of the aft potable-water ice-protection system.
The control unit 53DW control the operation of the aft fill-drain valve heaters.
You cannot control the system manually.
When the sensors detect icing conditions (depends on the stored temperature thresholds in the control unit), the control units will supply electrical power (115VAC) to the heater circuits and inner line heaters.
The control thresholds for the heater circuits are:
- heaters ON < 6.0 +1 -1 deg.C (42.80 +1.80 -1.80 deg.F),
- heaters OFF > 10.0 +1 -1 deg.C (50.00 +1.80 -1.80 deg.F).
The control unit(s) of the potable-water ice-protection is (are) provided with an internal BITE test.
The BITE test function monitors the correct function of: - the control and monitor circuits,
- the connected heater circuits (tapes),
- the connected temperature sensor,
- the internal solid states relays,
- the power supply of the system,
- the interface connector.
The Light Emitting Diodes (LED) show the correct status of the system.
The forward potable-water ice-protection-system operates when busbars 212XP-C, 214XP-C and 602PP are energized and circuit breakers 1DW, 2DW and 21DW are closed.
The control units 3DW and 23DW control the operation of the forward potable-water ice-protection-system and the innerline heaters to galley I and toilet A.
The aft potable-water ice-protection-system operates when busbars 212XP-C and 602PP are energized and the circuit breakers 31DW, 32DW and 51DW are closed.
Control unit 33DW controls the operation of the aft-potable-water ice-protection heater-system.
Control unit 53DW controls the operation of the aft-potable-water ice-protection heater-system and the aft fill and drain valve heaters.
You cannot control the system manually.
When the sensors detect icing conditions (in relation to the stored temperature thresholds in the control unit), the control units will supply electrical power (115VAC) to the heater circuits, innerline heaters and valve heaters.
The control thresholds for the heater circuits are:
- Heaters ON < 6 +-1 deg.C or -+1 deg.C (42.80 +-1.80 deg.F or -+1.80 deg.F)
- Heaters OFF > 10 +-1 deg.C or -+1 deg.C (50.00 +-1.80 deg.F or -+1.80 deg.F).
The BITE test function monitors the correct function of:
- The control and monitor circuits
- The connected heater circuits (tapes)
- The connected temperature sensor
- The internal solid states relays
- The power supply of the system
- The interface connector.
Two Light Emitting Diodes (LED) show the correct status of the system.
The forward potable-water ice-protection system operates when busbars 212XP-C, 214XP-C and 602PP are energized and circuit breakers 1DW, 2DW and 21DW are closed.
Control units 3DW and 23DW control the operation of the forward potable-water ice-protection system and the inner line heaters of galley I and toilet A.
The aft potable-water ice-protection system operates when busbars 212XP-C and 602PP are energized and circuit breakers 31DW, 32DW and 51DW are closed.
Control units 33DW and 53DW control the operation of the aft potable-water ice-protection system.
You cannot control the system manually.
When the sensors detect the icing conditions (in relation to the reference temperature in the control unit), the control units will supply electrical power (115VAC) to the heater circuits and the inner line heaters.
The operational temperature for the heater circuits is:
- Heaters ON < 6 +-1 deg.C or -+1 deg.C (42.80 +-1.80 deg.F or -+1.80 deg.F)
- Heaters OFF > 10 +-1 deg.C or -+1 deg.C (50.00 +-1.80 deg.F or -+1.80 deg.F).
The BITE test function monitors the correct function of:
- The control and monitor circuits
- The connected heater circuits (tapes)
- The connected temperature sensor
- The internal solid-state relays
- The power supply of the system
- The interface connector.
Two Light Emitting Diodes (LEDs) show the correct status of the system.