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S 256i
Technical Manual
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Miele S 251i, S 252i, S 254i, S 255i, S 256i Technical Manual

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TECHNICAL INFORMATION
S 2xx, S 3xx and S 4xx Canister Vacuums
© 2012 Miele USA
Technical Information
Table of Contents
1.0 Construction and Design .................................................................................... 7
1.1 General Information .............................................................................................. 7
1.2 Cleaning and Care ................................................................................................ 7
1.2.1Vacuums and Accessories ..................................................................................... 7
1.2.2Dust Compartment ................................................................................................. 7
1.1 Type/Construction ............................................................................................... 12
1.1.1S 3xx Components ............................................................................................... 12
1.1.2S 4xx Components ............................................................................................... 14
1.2 Features .............................................................................................................. 15
1.3 Technical Data .................................................................................................... 18
1.3.1S 247i - S 256i ...................................................................................................... 18
1.3.2S 269i - S 282i ...................................................................................................... 18
1.3.3S 3xx .................................................................................................................... 19
1.3.4S 4xx .................................................................................................................... 19
1.4 Accessories ........................................................................................................ 20
1.4.1 Standard Accessories .......................................................................................... 20
1.4.2Optional Accessories ........................................................................................... 20
1.4.3Accessories with New Locking System (S 2xx Only) ........................................... 20
1.5 Electrobrush Plug System (S 3xx and S 4xx Only) ............................................. 21
4.0 Description of Function .................................................................................... 21
4.1 Air Clean Plus Filter System ............................................................................... 21
4.1.1Super Air Clean Filter ........................................................................................... 21
4.1.2Active Air Clean Filter ........................................................................................... 22
4.1.3S-Class Filter ........................................................................................................ 22
4.2 Dustbag Change Indicator .................................................................................. 22
4.2.1S 27x .................................................................................................................... 22
4.2.2S 3xx .................................................................................................................... 23
4.2.3S 4xx .................................................................................................................... 24
4.3 Suction Power ..................................................................................................... 24
4.4 Power Regulation ............................................................................................... 25
4.4.1Models with Manual Power Selection .................................................................. 25
4.4.2Automatic Models ................................................................................................. 25
4.4.3Booster Setting ..................................................................................................... 26
4.4.4Phase-Chopping Control - Principle of Operation ................................................ 27
5.0 Service and Maintenance .................................................................................. 27
5.1 Dustbag Compartment Lid (and Hinges, if Applicable) ....................................... 28
5.1.1S 25x .................................................................................................................... 28
5.1.2S 27x .................................................................................................................... 28
5.1.3S 3xx .................................................................................................................... 28
5.1.4S 4xx .................................................................................................................... 28
5.2 Accessory Compartment Lid ............................................................................... 29
5.2.1 Reassembly (S 2xx Only) ..................................................................................... 29
5.3 Dustbag Holder ................................................................................................... 29
5.3.1S 25x .................................................................................................................... 29
5.3.2S 27x .................................................................................................................... 29
5.3.3S 3xx .................................................................................................................... 30
5.3.4S 4xx .................................................................................................................... 30
5.4 Dust Channel ...................................................................................................... 31
5.4.1S 25x .................................................................................................................... 31
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2xx, S 3xx & S 4xx Canister Vacuums
Technical Information
5.4.2
S 27x .................................................................................................................... 31
5.4.3S 3xx and S 4xx ................................................................................................... 31
5.5 Dustbag Change Indicator .................................................................................. 31
5.5.1S 25x .................................................................................................................... 31
5.5.2S 27x .................................................................................................................... 31
5.5.3 S 3xx .................................................................................................................... 32
5.5.4S 4xx .................................................................................................................... 32
5.6 Cap Assembly ..................................................................................................... 32
5.6.1S 25x .................................................................................................................... 32
5.6.2S 27x .................................................................................................................... 32
5.6.3S 3xx .................................................................................................................... 33
5.6.4S 4xx .................................................................................................................... 33
5.7 Rear Casing ........................................................................................................ 34
5.7.1S 25x .................................................................................................................... 34
5.7.2S 27x .................................................................................................................... 34
5.7.3S 3xx .................................................................................................................... 34
5.7.4S 4xx .................................................................................................................... 35
5.8 Foot Switches ..................................................................................................... 36
5.8.1S 25x and S 27x ................................................................................................... 36
5.8.2S 3xx .................................................................................................................... 36
5.8.3S 4xx .................................................................................................................... 36
5.9 Potentiometer/Suction Power Selector ............................................................... 37
5.9.1S 2xx .................................................................................................................... 37
5.9.2S 3xx .................................................................................................................... 38
5.9.3S 4xx .................................................................................................................... 40
5.10 Electronic (S 4xx Only) ....................................................................................... 42
5.11 Fault/Overheat Indicator Lamp ........................................................................... 43
5.11.1 S 2xx .................................................................................................................... 43
5.11.2S 4xx .................................................................................................................... 43
5.12 Plug Housing ...................................................................................................... 43
5.12.1S 25x .................................................................................................................... 43
5.12.2S 27x .................................................................................................................... 44
5.13 On/Off Switch ...................................................................................................... 44
5.13.1S 25x .................................................................................................................... 44
5.13.2S 27x .................................................................................................................... 44
5.13.3S 3xx .................................................................................................................... 44
5.14 Flush Socket Outlet ............................................................................................ 44
5.14.1S 25x .................................................................................................................... 44
5.14.2S 27x .................................................................................................................... 44
5.15 Sensor (Automatic Models S 280i - S 282i) ........................................................ 45
5.16 Cord Reel ............................................................................................................ 45
5.16.1S 23x .................................................................................................................... 45
5.16.2S 25x .................................................................................................................... 45
5.16.3S 27x .................................................................................................................... 46
5.16.4S 3xx .................................................................................................................... 46
5.16.5S 4xx .................................................................................................................... 46
5.17 Power Cord ......................................................................................................... 47
5.17.1S 27x .................................................................................................................... 47
5.17.2S 3xx .................................................................................................................... 47
5.18 Motor Assembly .................................................................................................. 48
5.18.1S 25x .................................................................................................................... 48
5.18.2S 27x .................................................................................................................... 49
5.18.3S 3xx .................................................................................................................... 50
5.18.4S 4xx .................................................................................................................... 50
3
Technical Information
5.19 Motor Electronic (Speed Control Board) ............................................................. 51
5.19.1S 3xx .................................................................................................................... 51
5.19.2S 4xx .................................................................................................................... 51
5.20 Motor Brushes .................................................................................................... 51
5.20.1S 3xx .................................................................................................................... 51
5.20.2S 4xx .................................................................................................................... 51
5.21 Electric Brush Socket (S 254i and S 255i Only) ................................................. 52
5.22 Suction Hose with Integrated Wiring (S 2xx Only) .............................................. 52
5.22.1S 254i and S 255i ................................................................................................. 52
5.22.2S 270i - S 276i, S 280i ......................................................................................... 52
5.22.3S 278i ................................................................................................................... 53
5.23 Turbo Brush (S 2xx Only) ................................................................................... 53
5.24 Buffer/Bumper Strip (S 3xx and S 4xx Only) ...................................................... 54
5.24.1S 3xx .................................................................................................................... 54
5.24.2S 4xx .................................................................................................................... 55
5.25 Grill for HEPA Filter (S 3xx Only) ........................................................................ 55
6.0 Fault Diagnosis .................................................................................................. 56
6.1 Improved Castor (S 2xx Only) ............................................................................ 56
6.2 Dirty Dustbag Compartment (S 27x and S 28x Only) ......................................... 56
6.2.1Dustbags, Old and New Versions ........................................................................ 56
6.2.2Modified Dustbag Holder ...................................................................................... 57
6.3 Poor Suction Performance (S 27x and S 28x) .................................................... 58
6.5 Poor Blower Performance (S 27x and S 28x) ..................................................... 59
6.6 Dustbag Change Indicator (S 3xx) ...................................................................... 59
6.7 Suction Power (S 3xx) ........................................................................................ 60
6.8 Motor Does Not Operate (S 345i and S 445i) ..................................................... 60
List of Figures
Figure 1-1: S 247i, S 248i ................................................................................................... 8
Figure 1-2: S 249i, S 250i ................................................................................................... 8
Figure 1-3: S 251i, S 252i ................................................................................................... 8
Figure 1-4: S 254i ............................................................................................................... 8
Figure 1-5: S 255i, S 256i ................................................................................................... 8
Figure 1-6: S 234i ............................................................................................................... 9
Figure 1-7: S 269i, S 270i ................................................................................................... 9
Figure 1-8: S 271i, S 272i ................................................................................................... 9
Figure 1-9: S 274i ............................................................................................................... 9
Figure 1-10: S 275i, S 276i ................................................................................................. 9
Figure 1-11: S 278i ............................................................................................................. 9
Figure 1-12: S 280i, S 282i ............................................................................................... 10
Figure 1-13: S 300i, S 301i ............................................................................................... 10
Figure 1-14: S 310i, S 313i ............................................................................................... 10
Figure 1-15: S 321i, S 324i, S326i .................................................................................... 10
Figure 1-16: S 334i, S 336i, S 338i ................................................................................... 10
Figure 1-17: S 342i ........................................................................................................... 11
Figure 1-18: S 344i ........................................................................................................... 11
Figure 1-19: S 346i, S 347i, S 348i ................................................................................... 11
Figure 1-20: S 400i, S 401i, S 402i, S 408i ...................................................................... 11
Figure 1-21: S 410i ........................................................................................................... 11
4
2xx, S 3xx & S 4xx Canister Vacuums
Technical Information
Figure 1-22: S 421i, S 422i, S 424i, S 426i ...................................................................... 11
Figure 1-23: S 434i, S 436i, S 438i ................................................................................... 12
Figure 1-24: S 442i ........................................................................................................... 12
Figure 1-25: S 444i ........................................................................................................... 12
Figure 1-26: S 446i, S 447i, S 448i ................................................................................... 12
Figure 1-27: S 3xx Components ....................................................................................... 13
Figure 1-28: S 4xx Components ....................................................................................... 14
Figure 1-29: 9.3cm Adapter Sleeve to Connect New and Old Accessories ..................... 20
Figure 1-30: 9.3cm Swivel Adapter Sleeve to Connect the Locking Electric Brush.......... 20
Figure 1-31: 20cm Swivel Adapter Sleeve to Connect Lockable Accessories ................. 21
Figure 4-1: S 3xx Dustbag Change Indicator ................................................................... 23
Figure 4-2: S 4xx Dustbag Change Indicator ................................................................... 24
Figure 4-3: Suction Power Curve ..................................................................................... 24
Figure 4-4: Phase-Chopping Control ................................................................................ 27
Figure 5-1: Dustbag Compartment Lid, S 4xx .................................................................. 28
Figure 5-2: Accessory Compartment Lid, Hinges and Springs (S 2xx Shown) ................ 29
Figure 5-3: Dustbag Holder, S 25x ................................................................................... 29
Figure 5-4: Dustbag Holder, S 27x ................................................................................... 30
Figure 5-5: Dustbag Holder, S 3xx ................................................................................... 30
Figure 5-6: S 3xx and S 4xx Dust Channel ...................................................................... 31
Figure 5-7: S 25x Cap Assembly ...................................................................................... 32
Figure 5-8: S 27x Rear Casing ......................................................................................... 33
Figure 5-9: Cap Assembly, S 4xx ..................................................................................... 33
Figure 5-10: Rear Casing, S 25x ...................................................................................... 34
Figure 5-11: Rear Casing, S 27x ...................................................................................... 34
Figure 5-12: Rear Casing, S 3xx ...................................................................................... 35
Figure 5-13: Rear Casing, S 4xx ...................................................................................... 35
Figure 5-14: Foot Switches, S 25x and S 27x .................................................................. 36
Figure 5-15: Foot Switch, S 3xx ....................................................................................... 36
Figure 5-16: Foot Switch, S 4xx ....................................................................................... 37
Figure 5-17: Potentiometer Cover, S 2x4i and S 2x5i ...................................................... 38
Figure 5-18: Catches on Potentiometer Control, S 2x4i and S 2x5i ................................. 38
Figure 5-19: Potentiometer Control, S 2x4i and S 2x5i .................................................... 38
Figure 5-20: Rotary Potentiometer, S 3xx ........................................................................ 39
Figure 5-21: Slide Potentiometer, S 3xx ........................................................................... 39
Figure 5-22: +/- Buttons, S 3xx ......................................................................................... 40
Figure 5-23: Electronic +/- Buttons, S 3xx ........................................................................ 40
Figure 5-24: S 4xx Slide Potentiometer ............................................................................ 41
Figure 5-25: Foot-Operated Power Selector, S 4xx ......................................................... 42
Figure 5-26: S 4xx Electronic Removal ............................................................................ 43
Figure 5-27: S 27x Plug Housing ...................................................................................... 44
Figure 5-28: Sensor Removal for Models S 280i - S 282i ................................................ 45
Figure 5-29: Cap Assembly with Lug, S 25x Models ........................................................ 46
Figure 5-30: Brake Lever Top Edge, S 25x Models ......................................................... 46
Figure 5-31: S 27x Power Cord Removal ......................................................................... 47
Figure 5-32: S 3xx Power Cord Removal ......................................................................... 47
Figure 5-33: S 25x Motor Assembly ................................................................................. 48
Figure 5-34: S 27x Motor Assembly ................................................................................. 49
Figure 5-35: S 4xx Motor with Holding Bracket ................................................................ 50
Figure 5-36: S 4xx Motor with Central Bearing ................................................................. 51
5
Technical Information
Figure 5-37: S 254i and S 255i Suction Hose with Integrated Wiring ............................... 52
Figure 5-38: S 270i - S 276i, S 280i Suction Hose with Integrated Wiring ....................... 53
Figure 5-39: S 278i Suction Hose with Integrated Wiring ................................................. 53
Figure 5-40: S 2xx Turbo Brush ....................................................................................... 54
Figure 6-1: Modified Castor, S 2xx ................................................................................... 56
Figure 6-2: Dustbag with Raised Rim on Collar, S 27x and S 28x ................................... 57
Figure 6-3: Dustbag without Raised Rim on Collar, S 27x and S 28x .............................. 57
Figure 6-4: Modified Dustbag Holder, S 27x and S 28x ................................................... 58
Figure 6-5: S 27x and S 28x Motor Seal and Holder ........................................................ 58
Figure 6-6: Blower Plate for S 27x and S 28x .................................................................. 59
Figure 6-7: S 3xx Dustbag Change Indicator ................................................................... 60
6
2xx, S 3xx & S 4xx Canister Vacuums
1.0 Construction and Design
1.1 General Information
All repairs should be performed by a trained technician in strict accordance
with national, state and local codes. Any repairs or maintenance performed by unqualified personnel could be dangerous.
When servicing, modifying, testing or maintaining appliances, all applicable
laws, regulations and accident prevention guidelines must be observed.
All regulations of the appropriate utility supply companies and standards
relating to safety (not limited to electrical safety) are to be complied with.
Before any service work is started, the vacuum cleaner must be
disconnected from the power supply.
Even with the vacuum switched off, supply voltage may be applied to
some components.
Do not leave the vacuum unattended when it is plugged in. Turn off and
unplug the vacuum before opening the cover.
After work has been completed, a visual as well as an operational check
should always be performed.
1.2 Cleaning and Care
1.2.1 Vacuums and Accessories
The vacuum cleaner and other plastic components can be cleaned using a damp cloth or a cleaner made especially for plastics.
Technical Information
Warning!
Do not use abrasive, glass or all-purpose cleaning solutions, as these can cause considerable damage to the plastic components of the vacuum or its accessories.
1.2.2 Dust Compartment
The dust compartment can be cleaned using another vacuum, if available, or a dry cloth or brush.
Monitor the bag change indicator and inspect all filters regularly. Replace them when necessary according to the maintenance instructions.
7
Technical Information
Figure 1-1: S 247i, S 248i
Figure 1-2: S 249i, S 250i
Figure 1-3: S 251i, S 252i
Figure 1-4: S 254i
Figure 1-5: S 255i, S 256i
8
2xx, S 3xx & S 4xx Canister Vacuums
Technical Information
Figure 1-6: S 234i
Figure 1-7: S 269i, S 270i
Figure 1-8: S 271i, S 272i
Figure 1-9: S 274i
Figure 1-10: S 275i, S 276i
Figure 1-11: S 278i
9
Technical Information
Figure 1-12: S 280i, S 282i
Figure 1-13: S 300i, S 301i
Figure 1-14: S 310i, S 313i
Figure 1-15: S 321i, S 324i, S326i
Figure 1-16: S 334i, S 336i, S 338i
10
2xx, S 3xx & S 4xx Canister Vacuums
Figure 1-17: S 342i
Technical Information
Figure 1-18: S 344i
Figure 1-19: S 346i, S 347i, S 348i
Figure 1-20: S 400i, S 401i, S 402i, S 408i
Figure 1-21: S 410i
Figure 1-22: S 421i, S 422i, S 424i, S 426i
11
Technical Information
Figure 1-23: S 434i, S 436i, S 438i
Figure 1-24: S 442i
Figure 1-25: S 444i
Figure 1-26: S 446i, S 447i, S 448i
1.1 Type/Construction
Canister vacuum cleaner.
1.1.1 S 3xx Components
12
2xx, S 3xx & S 4xx Canister Vacuums
Technical Information
Figure 1-27: S 3xx Components
These vacuum cleaners consist of 4 main parts:
1) Switch unit
− Suction power selector or electronic, depending on model
− “On/Off” switch
− Overheating warning light, depending on model
− Group plug
2) Rear casing
− Filter system
− Cable rewind
− Motor
− Park System switch
− Plug connectors
3) Dustbag compartment casing
− Accessory compartment with lid
− Suction hose connection with shutter
− Dustbag change indicator
− Accessories
− Hinges
− Slip-ring system for electrobrush, S 324i and S 346i only
4) Casing base
− Motor protection filter
− Dustbag holder
− Bumper strip
− Storage slot (for floor attachment)
− Electrobrush socket, depending on model
− 3 castors
13
Technical Information
1.1.2 S 4xx Components
Figure 1-28: S 4xx Components
1) Integrated in rear casing
− Foot switch unit
− Suction power selector on top
− Cable rewind
− Motor
2) Integrated in dustbag compartment casing
− Accessory compartment with lid
− Dustbag change indicator
− Suction hose connection
With Automatic models
− Connection stub for negative pressure hose
3) Integrated in housing base
− Motor protection (matted filter)
− Dustbag holder
− Bumper strip
− Electrobrush socket (depending on model)
With Automatic models
− Negative pressure switch
14
2xx, S 3xx & S 4xx Canister Vacuums
1.2 Features
Model S 247i, S 248i S 249i, S 250i S 251i, S 252i S 254i S 255i, S 256i
Dustbag change indicator
Automatic cord rewind
Electric brush socket
Overheating indicator
Suction power selection
Rotary knob x
Foot switch x x
Model S 269i, S 270i S 271i, S 272i S 274i S 275i, S 276i S 278i S 280i, S 282i
Dustbag change indicator
Automatic cord rewind
Electric brush socket
Overheating indicator
Suction power selection
Rotary knob x
Foot switch x x x
Handle of wired suction hose
Automatic x
Model S 300i S 301i S 310i S 313i S 321i S 324i S 326i
Suction power regulation via air inlet valve
Rotary switch x x
Slide switch x x x
Telescopic suction tube
Universal floor attachment
Super Air Clean filter
Active Air Clean filter
x x x x x
x x x x x
x x
x x
x x x x x x
x x x x x x
x x x x
x x x
x
x x x x x x x
x x x x
SBD 304 SBD 404 SBD 304
x x x x x x o
o o o o o o x
Technical Information
SBD 304 SBD 304 SBD 304 SBD 304
15
Technical Information
Model S 300i S 301i S 310i S 313i S 321i S 324i S 326i
S-Class filter o o o o o o o
Auto-reverse cord rewind
Electrobrush socket
Overheating warning light
Blower connection
Radius of operation
Dustbag capacity
Fuse rating
Protection classification
Model S 334i S 336i S 338i S 342i S 344i S 346i S 347i S 348i
Suction power regulation via air inlet valve
+/- buttons x x x
Fully electronic (+/­buttons)
AUTO setting x x x x x
Booster function
Telescopic suction tube
Universal floor attachment
Super Air Clean filter
Active Air Clean filter
S-Class filter o x o o o o x
Auto-reverse cord rewind
Electrobrush socket
Overheating warning light
Blower connection
Radius of operation
o o o o o o o
x x
x x x x x
x x x x x x Separate
10m
4L
10A, slow-trip switch
Class II, double-insulated
x x x x x x x x
x x x x x
x x x
x x x x
SBD 304
x o o o x o o o
o x o x o x x o
x
x x x x x x x x
x x
x Separate Separate Separate x Separate Separate Separate
10m 10m 10m 10m 10m 10m 10m 10m
10m 10m 10m 10m 10m 10m
4L 4L 4L 4L 4L 4L
1
x x x x
SBD 304 SBD 304
x x x x x x x
x x x x x x
SBD 304 SBD 264 SBD 264 SBD 264 SBD 264
16
2xx, S 3xx & S 4xx Canister Vacuums
Model S 334i S 336i S 338i S 342i S 344i S 346i S 347i S 348i
Dustbag capacity
Fuse rating
Protection classification
4L
10A, slow-trip switch
Class II, double-insulated
4L 4L 4L 4L 4L 4L 4L
Model S 401i S 408i S 410i S 421i S 424i S 426i S 428i
Suction power regulation via air inlet valve
Rotary switch x
Slide switch x x x x
Telescopic suction tube
Super Air Clean filter
Active Air Clean filter
S-Class filter x x
Electrobrush socket
Overheating warning light
Blower connection
Radius of operation
x x x x x x x
x x x x x
x x x x
x
x x x
x x x x x
x Separate x x x Separate Separate
10m
10m 10m 10m 10m 10m 10m
Model S 434i S 436i S 438i S 444i S 446i S 447i S 448i
Suction power regulation via air inlet valve
Rocker switch x x x
Fully electronic (+/- buttons)
AUTO setting x x x x
Booster function
Telescopic suction tube
Super Air Clean filter
Active Air Clean filter
S-Class filter x x
Auto-reverse cord rewind
Electrobrush socket
x x x x x x x
x x x x
x x x
x x x x x x x
x x
x x x
x x x x x x x
x x x x x x x
Technical Information
17
Technical Information
Model S 434i S 436i S 438i S 444i S 446i S 447i S 448i
Overheating warning light
Blower connection
Radius of operation
x x x x x x x
x Separate Separate x Separate Separate Separate
10m 10m 10m 10m 10m 10m 10m
x = Standard o = Optional
1
Stainless-steel telescopic suction tube
1.3 Technical Data
1.3.1 S 247i - S 256i
Suction pressure 240mbar
Throughflow rate 56 L/sec
Dustbag Two-ply paper bag
Dustbag capacity 4L
Operational radius 9.5m
Weight including accessories 7.9kg
Electrical connection 220-230 V 50Hz
Fuse rating 10A, slow-trip switch
Safety classification Doubly insulated
Test certificate VDE interference suppression symbol
Noise level 74.5dBA
1.3.2 S 269i - S 282i
Suction pressure 240mbar
Throughflow rate 56 L/sec
Dustbag Two-ply paper bag
Dustbag capacity 5.8L
Operational radius 9.7m
Weight including accessories 8.8kg
Electrical connection 220-230 V 50Hz
Fuse rating 10A, slow-trip switch
Safety classification Doubly insulated
Test certificate VDE interference suppression symbol
Noise level 74.5dBA
18
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