TECHNICAL INFORMATION
CVA615 Coffee System
© 2007 Miele USA
CVA615 Coffee System
Technical Information
CVA615 Coffee System – Table of Contents (continued)
4.21 Water Valve.............................................................................................44
4.22 Electronic Assemblies .............................................................................45
4.22.2 CPU Electronic ............................................................................46
Lid - Removal ..........................................................................................47
Rear Panel - Removal .............................................................................48
Base Plate - Removal..............................................................................51
Drip Tray - Removal ................................................................................52
5.10 Rear Door Panel - Removal ....................................................................55
5.12 Selector Switch - Removal ......................................................................57
5.17 Hot Water Nozzle - Removal...................................................................62
5.22 Brew Unit - Installation.............................................................................67
5.24 Brew Unit – Filter Cleaning......................................................................68
5.26 Brew Unit - Lubrication ............................................................................71
Installed in Appliance) .............................................................................72
5.29 Brew Unit Handle - Removal ...................................................................73
5.30 Brew Unit Funnel - Removal....................................................................74
5.31 Brew Unit Ram - Service .........................................................................75
5.32 Brew Unit Drives - Service.......................................................................77
5.33 Water Tank Float - Removal....................................................................82
5.36 Beans Container - Removal ....................................................................86
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CVA615 Coffee System
Technical Information
CVA615 Coffee System – Table of Contents (continued)
5.38 Grinder - Disassembly.............................................................................88
5.40 Grinder Unit - Removal............................................................................92
5.42 Dispenser Switch - Removal ...................................................................93
5.44 Water Path Leakage Test........................................................................96
Service Mode...........................................................................................99
Fault Diagnosis......................................................................................103
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CVA615 Coffee System
Technical Information
CVA615 Coffee System – List of Figures
Figure 1-1: Front Overview CVA615...............................................................................9
Figure 1-2: CVA Controls..............................................................................................10
Figure 1-3: Interior View of CVA615 with Door Opened ...............................................10
Figure 1-4: CVA615 Product Dimensions.....................................................................11
Figure 1-5: CVA615 Overhead View of Components ...................................................12
Figure 2-1: Operating Manual.......................................................................................13
Figure 3-1: Cup Under the Dispensing Ports................................................................14
Figure 3-2: Pressing the Coffee Button.........................................................................14
Figure 3-3: Displayed Message ....................................................................................14
Figure 3-4: Canceling the Preparation Process............................................................15
Figure 3-5: Steam Selector...........................................................................................15
Figure 3-7: Hot Water Button........................................................................................16
Figure 3-8: Grinder Controls .........................................................................................17
Figure 3-9: Adding Coffee Beans..................................................................................18
Figure 4-1: Door Contact Switch (S24).........................................................................20
Figure 4-2: Brew Unit in “Home” Position .....................................................................21
Figure 4-3: Brew Unit Connections...............................................................................22
Figure 4-4: Brew Unit Filters .........................................................................................23
Figure 4-5: Brew Unit Components...............................................................................24
Figure 4-7: Waste Unit Present Switch.........................................................................26
Figure 4-8: Waste Unit..................................................................................................27
Figure 4-9: Water Tank.................................................................................................28
Figure 4-10: Water Level Switch.....................................................................................29
Figure 4-11: Water Level Switch Float............................................................................29
Figure 4-12: Grinder Assembly.......................................................................................31
Figure 4-13: Components of the Grinder Overload Protection .......................................33
Conditions...................................................................................................34
Figure 4-15: Coffee Dispensing Components.................................................................35
Figure 4-16: Dispensing Lever........................................................................................36
Present Switch............................................................................................37
Figure 4-18: Brew Unit Drive Assembly..........................................................................38
Figure 4-19: Hot Water / Coffee Heater..........................................................................40
Figure 4-20: Steam Heater .............................................................................................41
Figure 4-21: Water Path..................................................................................................42
Figure 4-22: Water Valve (Disassembled)......................................................................44
Figure 4-23: Power Electronic Board..............................................................................45
Figure 4-24: CPU (Control) Electronic ............................................................................46
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CVA615 Coffee System
Technical Information
CVA615 Coffee System – List of Figures (continued)
Figure 5-1: Lid with Screws...........................................................................................47
Figure 5-3: Rear Panel Removal ..................................................................................48
Figure 5-6: Base Plate - Removal.................................................................................51
Figure 5-7: Drip Tray Removal......................................................................................52
Figure 5-8: Overflow Switch Actuator Float ..................................................................53
Figure 5-9: Overflow Switch..........................................................................................54
Figure 5-10: Rear Door Panel - Removal .......................................................................55
Figure 5-11: Fascia Panel Cover Assembly....................................................................56
Figure 5-12: Selector Switch...........................................................................................57
Figure 5-14: Components of the Coffee Dispensing Nozzle...........................................59
Figure 5-16: Hot Water Valve Components....................................................................62
Figure 5-17: Brew Unit....................................................................................................66
Figure 5-19: Brew Unit – Removal for Cleaning .............................................................67
Figure 5-20: Brew Unit Installation..................................................................................68
Figure 5-22: Brew Unit Lubrication Points ......................................................................71
Figure 5-23: Brew Unit Lubrication Points ......................................................................71
Figure 5-24: Moving the Brew Unit to “Home Position”...................................................72
Figure 5-25: Brew Unit in Reset Position........................................................................72
Figure 5-27: Rear of the Brew Unit, Highlighting the Funnel Lock..................................74
Figure 5-31: Ram Assembly ...........................................................................................76
Figure 5-33: Grinder Retaining Screws...........................................................................79
Figure 5-34: Grinder Retaining Nuts...............................................................................79
Figure 5-35: Upper Front Plate Assembly Retaining Screws..........................................80
the Screws at the Bottom ...........................................................................81
Figure 5-38: Levering Off the Lip Seal Cap ....................................................................83
Figure 5-39: Removing the Lip Seal ...............................................................................83
Figure 5-40: Water Tank Lip Seal Removal....................................................................84
Figure 5-42: Removing the Beans Container..................................................................86
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CVA615 Coffee System
Technical Information
CVA615 Coffee System – List of Figures (continued)
Figure 5-43: Beans Container Guide ..............................................................................87
Figure 5-44: Grinder - Disassembly................................................................................88
Figure 5-45: Grinder........................................................................................................89
Figure 5-46: Grinder - Apart............................................................................................90
Figure 5-47: Grinder Removal ........................................................................................92
Figure 5-48: Grinder Coupling ........................................................................................93
Figure 5-49: Test Jumper Position..................................................................................95
Figure 5-50: Display While in Service Mode...................................................................95
Figure 5-51: Water Path Connection ..............................................................................97
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CVA615 Coffee System
Technical Information
CVA615 Coffee System – List of Tables
Table 6-1: Programming Mode Navigation..................................................................98
Table 6-2: Service Mode Navigation..........................................................................100
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CVA615 Coffee System
Technical Information
1.0
Construction and Design
1.1
Appliance Overview
1.1.1
Front View
1
2
3
4
5
6
Hot Water Dispenser
Coffee Dispensers (Height-Adjustable)
Handle to Open Appliance Front
Steam Selector
Steam Nozzle with Milk Frother
Drip Catch
Figure 1-1: Front Overview CVA615
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CVA615 Coffee System
Technical Information
1.1.2
Controls
7
Program Selector
8
Message Window
9
10
11
Coffee Serving Buttons
Rinse / Pre-Warm Button
Hot Water Button
Figure 1-2: CVA Controls
1.1.3
Interior (Front of Appliance Opened)
12
13
14
15
16
17
Coffee Bean Container
Slide Control to Select Fineness of Ground Coffee
Slide Control to Select Quantity of Ground Coffee
Water Tank
Waste Unit
Brew Unit
Figure 1-3: Interior View of CVA615 with Door Opened
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CVA615 Coffee System
Technical Information
1.3
Layout of Components
Overhead View of Main Components
1
2
3
4
5
6
7
8
9
Waste Container
Brew Unit
Grinder
Water Tank
CPU Electronic Board
Drive Assembly (Mounted to Wall)
Drive Assembly Cover
Hot Water / Coffee Heater
Water Pump
10 Flowmeter
11 Steam Heater
12 Steam Solenoid Valve
13 Power Electronic Board
Figure 1-5: CVA615 Overhead View of Components
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CVA615 Coffee System
Technical Information
3.0
Commission and Operation
3.1
General Operation
3.1.1
Preparing Coffee
1. Place a cup under both coffee dispensing ports.
Figure 3-1: Cup Under the Dispensing Ports
2. Press the desired size coffee button once. This will start the
preparation cycle.
Figure 3-2: Pressing the Coffee Button
The following message will appear in the message window, depending on
the button pressed:
Figure 3-3: Displayed Message
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CVA615 Coffee System
Technical Information
3.1.2
Canceling the Preparation
Press any one of the coffee buttons to stop preparation immediately.
Figure 3-4: Canceling the Preparation Process
3.1.3
Steam Control
Caution:
The steam from the appliance is extremely hot; use caution to prevent
burns.
•
•
Turn the steam ON by turning the Steam Selector counter-clockwise.
Turn the steam OFF by turning the Steam Selector clockwise.
Figure 3-5: Steam Selector
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CVA615 Coffee System
Technical Information
3.1.4
Hot Water
1. Place a cup under the hot water dispenser.
Figure 3-6: Placement of Cup Under the Hot Water Dispenser
2. Press the hot water button. Hot water will be dispensed.
3. Press the hot water button again to stop the flow of hot water.
Figure 3-7: Hot Water Button
Note:
If programmed with the hot water feature activated…
The flow of hot water will stop automatically once a predetermined
amount of hot water has passed through the system
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CVA615 Coffee System
Technical Information
3.1.5
Adjusting the Coffee Grinder
Controls
ƒ
ƒ
Slide to the left for finer grinding.
Slide to the right for coarser grinding.
Figure 3-8: Grinder Controls
ƒ
If the espresso flows too quickly into the cup, the beans may have
been ground too coarsely. The grinder should be adjusted to a finer
setting.
ƒ
If the espresso only trickles into the cup, the beans may have been
ground too fine and the coffee will be bitter. The grinder should be
adjusted to a coarser setting.
ƒ
ƒ
If the crema is evenly colored but pale, the ground coffee is too
coarse.
If the crema is very dark brown on one side, graduating almost to
white on the other, the ground coffee is too fine.
Note:
ƒ
ƒ
You should be able to feel notches when moving the slide control.
If the slide control will not move:
Close the machine and dispense a cup of coffee. Then try to move
the slide control again.
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CVA615 Coffee System
Technical Information
3.1.6
Filling the Coffee Beans Container
1. Open the appliance door.
2. Carefully slide the container out so that the lid is visible.
3. Lift the lid.
4. Fill the container with coffee beans to about 1" from the top.
5. Close the lid and push the container back into place.
6. Shut the appliance door.
Figure 3-9: Adding Coffee Beans
Important!
Only put whole espresso or coffee beans in the container. Anything else,
including ground coffee, hot cocoa, instant coffee, or treated coffee
beans (flavorings, caramel, or sugar) will damage the grinder.
Note:
Do not remove the coffee bean container from the appliance unless it is
completely empty, otherwise coffee beans will spill out.
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CVA615 Coffee System
Technical Information
3.1.7
Filling the Water Tank
The water tank must be washed and filled with fresh drinking water each
day. A reminder will appear in the message window when the unit is first
turned on.
1. Open the front of the machine.
2. Lift the water tank up and out of the appliance.
3. Open the lid and fill the container with cold drinking water to within
about 1" (2 cm) of the top.
Important!
Never add hot water or any other liquid except cold water to the water
tank.
4. Close the lid and place the tank in the machine, pushing it straight
back.
5. Close the front of the appliance.
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CVA615 Coffee System
Technical Information
4.0
Description of Function
4.1
Door Switch
The door switch, removes power to the appliance when the door is
opened. Refer to Figure 4-1 – Door Contact Switch (S24).
Figure 4-1: Door Contact Switch (S24)
4.2
Overflow (Reed) Switch
The overflow switch is in the lower section of the appliance case.
The float with magnet is located in the drip tray. Should a leak develop,
water flows into the drip tray. The float with magnet then rises and
activates the overflow reed switch which in turn causes the electronic
control to switch the unit off.
Note:
When the Service Mode is accessed, the top line of the display shows
the switches that are activated. An “A” will be displayed if the Overflow
Switch is actuated. (i.e. water present in the bottom of the appliance)
Refer to Section 6 for more information on the Service Mode.
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CVA615 Coffee System
Technical Information
4.3
Brew Unit – Cleaning and Care
The Brew Unit is a mechanically operated component that is subjected to
high forces. After a long period of use, the Brew Unit may become
clogged. To ensure correct operation of the Brew Unit, it is essential to
clean it regularly and apply silicone grease to the moving parts. Refer to
Section 5.0 – Service and Maintenance for further information and
procedures.
4.4
Brew Unit Removal from the Appliance
The brew unit must be in the home position (refer to Figure 4-2) before it
can be removed from the appliance.
Figure 4-2: Brew Unit in “Home” Position
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CVA615 Coffee System
Technical Information
4.5
Connection of Brew Unit to Drive Mechanism
1
2
3
4
5
6
Drive Shaft Socket
Water Connection Socket
Locking Mechanism Switch Lug
Brew Unit Switch
Water Nozzle
Drive Shaft
Figure 4-3: Brew Unit Connections
Operation
Refer to Figure 4-3 – Brew Unit Connections.
When the Brew Unit is placed into in the appliance, it locks into position.
The locking mechanism Switch Lug (Item 3), activates the Brew Unit
Switch (Item 4). The Drive Shaft (Item 6) engages with the Brew Unit
Drive Shaft Socket (Item 1). The Nozzle (Item 5), supplies the Brew Unit
with hot water under pressure. When the Brew Unit is in the brewing
position, the socket (Item 2), allows hot water to pass through the coffee.
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CVA615 Coffee System
Technical Information
4.6
Brewing Procedure
1. The grinder fills the dispenser housing until full (as determined by the
dispenser switch).
2. The grinder is then switched off.
3. The dispenser flap opens twice (two clicks) via the dispenser solenoid
assembly.
4. The ground coffee then falls into the brew unit via the funnel.
1
2
3
Funnel
Percolator Chamber
Bottom Filter
Figure 4-4: Brew Unit Filters
Refer to Figure 4-5 – Brew Unit Components.
5. The drive tilts the percolator chamber and raises it to the brewing
position. The ground coffee is compressed between the Top Filter
(Item 2) and Bottom Filter (Item 5).
6. Water then flows through the Water Nozzle Socket, (Item 4). The
pump forces the hot water through the Brew Unit and the compressed
grounds (Pos 3). Coffee exits the top of Brew Unit via the Outlet (Item
1).
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CVA615 Coffee System
Technical Information
Refer to Figure 4-6 – Brew Unit, Showing Compressed Coffee “Puck”.
7. As the drive begin to move back toward the starting (home) position
the coffee chamber moves upward and releases the used
compressed coffee grounds (puck). Pos. 1.
8. The drive continues and returns the brew unit to its starting (home)
position.
Figure 4-6: Brew Unit, Showing Compressed Coffee “Puck”
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CVA615 Coffee System
Technical Information
4.7
Grounds Container
After coffee has been prepared, the coffee grounds compressed puck
falls into the waste container. The electronic monitors the number of the
compressed pucks. After a specific amount is reached, the message
“Empty waste unit” is displayed.
4.8
Waste Unit Present Switch
A reed switch is mounted to the bottom of the housing – as shown in the
Figure 4-7.
Figure 4-7: Waste Unit Present Switch
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CVA615 Coffee System
Technical Information
The actuating magnet (Figure 4-8, Item 1) for the Waste Unit switch is
fitted in the bottom edge of the container. The electronic monitors whether
the waste unit is installed.
1
Magnet for Present Switch Actuation
Figure 4-8: Waste Unit
When the appliance is placed into the Service Mode, the top line of the
display shows the switches that have been activated. A “5” is displayed
when the Waste Unit is installed and the switch is actuated. For further
information, refer to Section 6 – Service Mode.
Note:
On newer Waste Units, an additional magnet has been installed that
assists in keeping the waste unit attached to the metal frame inside the
appliance.
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CVA615 Coffee System
Technical Information
4.9
Water Tank
Refer to Figure 4-9 – Water Tank.
The Water Tank holds the water required for the brewing of the coffee,
hot water and steam. When the Water Tank is installed, the sealing ring is
pressed upwards allowing water to flow out.
1
Valve Assembly
Figure 4-9: Water Tank
When the tank is removed from the unit, the spring closes the sealing ring
to ensure water cannot flow from the tank when it is out of the appliance
for filling etc…
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CVA615 Coffee System
Technical Information
4.10
Water Level Switch
The Water Level Switch is located within the housing (as shown in Figure
4-10, Item 1).
Figure 4-10: Water Level Switch
The actuating magnet for the Water Level Switch is located in the Water
Tank as shown below (Figure 4-11, Item 1).
Figure 4-11: Water Level Switch Float
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CVA615 Coffee System
Technical Information
When the water tank is installed, and contains at least 30-33 ounces of
water; the Water Level Switch is activated and its contacts close.
If the water quantity drops below the minimum quantity, the water level
switch is no longer activated and the contacts open.
After the switch opens, the water passing through the water pump is
registered via the flowmeter and recorded by the electronic unit as up to
27 ounces of water is still available.
After the 27 ounces is calculated as being used, the display shows “Fill
water tank”. To prevent the water pump from running dry, about 3 – 7
ounces of water remains in the tank.
If the appliance is placed into the service mode the top line of the display
shows the switches that have been activated. A “7” is displayed when the
water tank is installed and filled with water. Refer to section 6 – Service
Mode for further information.
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CVA615 Coffee System
Technical Information
4.11
Grinder Assembly
1
2
Seal
Bracket
3
4
Lock Ring
Ring
5
6
Ball (3) (2mm)
Spring
7
Cover
8
9
Motor Bracket
Vibration Dampener (3)
Reinforcement Ring
Felt Ring
Cover
Worm Gear
Cone
Mounting
Ball (3) (5mm)
Carrier (3)
Motor
10
11
12
13
14
15
16
17
18
Figure 4-12: Grinder Assembly
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CVA615 Coffee System
Technical Information
Refer to Figure 4-12 – Grinder Assembly.
The grinding grade depends on the gap between the Grinding Cone and
the Grinding Ring.
The gap is set via an adjustment lever fitted to the adjustment ring.
The smaller the gap, the finer the coffee grind.
Warning!
To avoid damage to the grinder, the grinder should only be adjusted in
small steps.
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CVA615 Coffee System
Technical Information
4.12
Grinder – Overload Protection
If the grinder becomes blocked, a slip coupling interrupts the drive
between the motor and the grinder.
1
2
3
4
5
6
7
8
Grinder Motor
Carrier
Mounting
Spring
Ball
Grinding Cone
Washer
Intake Worm Gear
Figure 4-13: Components of the Grinder Overload Protection
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CVA615 Coffee System
Technical Information
Refer to Figure 4-13 – Components of the Grinder Overload Protection.
The Grinder Motor (Item 1) drives the mounting (Item 3) via the carriers
(Item 2). The rotary force is then transferred via the balls, (Item 5) to the
grinder cone (Item 6).
Should the Grinder Cone become blocked the balls are pressed into the
mounting (as shown below in figure C). The drive force is interrupted; and
the worm gear continues to operate via the mounting.
A
B
C
Normal Operation
Overload Protection Activated
Force Transfer Interrupted
Figure 4-14: Ball Positions into the Grinder Cone, Under Different Operating
Conditions
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CVA615 Coffee System
Technical Information
4.13
Ground Coffee Dispensing
1
2
3
4
5
6
7
8
9
Dispenser Lever
Switch – Dispensing (1S13)
Catch – Switch – Dispensing
Catch – Coil – Dispensing
Coil – Dispensing (1L1)
Spring
Actuator
Bolt
Dispenser Flap
10 Wiper
Figure 4-15: Coffee Dispensing Components
By adjusting the dispenser lever (Figure 4-15, Item 1), the position of the
switch slide, in the dispenser container is modified. This changes the
volume of the dispenser container and hence the quantity of ground
coffee that it can hold before it is full. Each slider setting alters the coffee
quantity by approx. 0.5 grams.
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CVA615 Coffee System
Technical Information
The grinder fills the dispenser container with ground coffee. When the
dispenser container is full, the dispensing switch is actuated and the
grinder motor is switched off.
Figure 4-16: Dispensing Lever
To fill the brew unit - the dispensing solenoid is energized twice and the
dispenser flap opens twice. The ground coffee drops from the dispenser
container into the brew unit.
If the dispenser container is not filled because, there are no coffee beans
in the bean holder; the dispenser switch is not activated. The display then
shows “Fill coffee beans”.
4.14
Dispenser Switch
The service mode can be used to check whether the dispenser switch is
activated. With the appliance in the service mode, the top line of the
display shows the switches that have been activated. The “3” indicates
that the dispenser container is full / switch is actuated. Refer to Section 6
– Service Mode for further information.
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CVA615 Coffee System
Technical Information
4.15
Brew Unit Drives
Refer to Figure 4-17 – Components of the Brew Unit Drive Assembly,
Water Connection and Present Switch.
When the brew unit is placed in the appliance, it locks into position. The
locking mechanism switch lug (Item 3) activates the brew unit present
switch (Item 4). The drive shaft (Item 6) engages with the drive shaft
socket.
1
2
3
4
5
6
Brew Unit Drive Shaft Socket
Socket
Locking Mechanism Switch Lug
Switch – Brew Unit Present Switch
Nozzle – Coffee Heater
Drive Shaft
Figure 4-17: Components of the Brew Unit Drive Assembly, Water Connection
and Present Switch
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CVA615 Coffee System
Technical Information
Refer to Figure 4-18 – Brew Unit Drive Assembly.
The drive motor (Item 1) is powered by the electronic and turns both the
worm gear (Item 3) and the single-stage step-down gear (Item 4). The
drive shaft cog gear (Item 5) has two switch actuators for the brew
position switch (Item 6) and the home position switch (Item 7). Both
switches are monitored by the electronic to determine the position of the
brew unit.
1
2
3
4
5
6
7
Drive Motor
Brew Unit Present Switch
Worm Gear
Step Down Gear
Drive Shaft Cog Gear
Brew Position Switch
Home (Start) Position Switch
Figure 4-18: Brew Unit Drive Assembly
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CVA615 Coffee System
Technical Information
4.16
4.17
4.18
Water Pump
The pump is self-priming and can develop a pressure of up to approx. 16
bar. For espresso preparation a pressure of approx. 8 bar is required so
that the water can be forced through the compressed ground coffee. A
further increase in pressure does not improve beverage quality.
The pump is fitted with a safety valve which opens at 16 bar system
pressure. If pressure is too high, water is passed from the safety valve via
a hose
The pump is connected in series with a temperature limiter. The
temperature limiter interrupts the power to the pump should a high
temperature develop.
Flow Meter
All water taken from the water container flows through the flow meter. The
flow meter passes signals to the electronic unit proportional to the
quantity of water passing through it.
The electronic unit then establishes the quantity of water that has flowed
and stores the figure. Approx. 300 pulses from the flow meter indicate a
flow of 3 ounces of water.
The electronic unit controls the required water quantity for beverage
preparation and ensures that it remains constant. The service mode can
be used to check the proper operation of the flow meter. See section 6 –
Service Mode for further information.
Heaters
Coffee / Hot Water Heater 1R1 & 1R2
Voltage 120V
Power rating 275W and 1090W
Steam Heater 2R1
Voltage 120V
Power rating 1100W
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CVA615 Coffee System
Technical Information
4.19
Flow Through Heaters
The Coffee Flow Through Heater (Figure 4-19 – Hot Water / Coffee
Heater) has a large heater element; and a small heater element. The
Steam Flow Heater has only one heater element (refer to figure 4-20 –
Steam Heater)
Each Flow Through Heater has a Positive Thermal Coefficient (PTC)
Temperature Sensor that provides a signal to the electronic unit for
temperature control. In addition, a Thermostat is connected in series with
the heater element. Should the temperature become too high, the
Thermostat interrupts the power to the heater element.
1
2
3
4
5
6
Heater Element
Water Valve
Temperature Sensor (PTC)
Heater Element
Thermal Fuse
Thermostat
Figure 4-19: Hot Water / Coffee Heater
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CVA615 Coffee System
Technical Information
As a final measure each heating circuit uses a temperature safety fuse
(Figure 4-20 – Item 3). In the event the temperature became too high due
to a fault, this fuse blows and cuts the power being supplied to the heater
element. Should this fuse blow, the cause must be located and resolved
before the fuse is replaced.
1
2
3
4
Heater Element
Thermal Fuse
Thermostat
Temperature Sensor (PTC)
Figure 4-20: Steam Heater
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CVA615 Coffee System
Technical Information
4.20
Water Path
1
2
3
4
5
6
7
Water Tank
Sealing Ring
Water Filter
Flow Meter
Pump
8
9
Coffee / Hot Water Heater – Coffee
Water Valve (to Brew Unit)
Valve – Steam (Solenoid valve)
Valve – Hot Water (Solenoid valve)
Steam Heater
Valve – Steam (in door)
Frothing Nozzle
10
11
12
13
14
Valve – Safety
Drain Hose – Excess Pressure
Figure 4-21: Water Path
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CVA615 Coffee System
Technical Information
4.20.1
Water Intake
The Pump takes in water from the water tank. (The Pump is fitted with a
safety valve which opens at approx. 16 bar (232 psi) system pressure. If
the pressure is too high and the safety valve opens, water is drained off
via a hose to the drip tray).
4.20.2
4.20.3
4.20.4
Water Path - Coffee
The water is then pumped under pressure through the Flowmeter, and
through the Coffee Flow Through Heater. The water is then passed
through the Water Valve, into the Brew Unit.
Water Path – Hot Water
The Pump moves water under pressure through the Flowmeter, and
through the Coffee Flow Through Heater. The water is then passed via
the Hot Water Valve to the Hot Water Outlet.
Water Path – Steam
The pump moves water under pressure via the Flowmeter and through
the Coffee Flow Through Heater. When the user selects steam; the
Electronic energizes the Steam Valve. Water continues flowing through
the Steam Flow Through Heater. Steam is then dispensed from the
frothing nozzle.
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CVA615 Coffee System
Technical Information
4.21
Water Valve
The Water Valve is attached to the output of the Coffee / Hot Water Flow
Through Heater. The valve is in a normally closed position.
When the Brew Unit is driven into the brew position the valve
mechanically opens and water is supplied to the Brew Unit. This
connection must be air / water tight to prevent air from entering the water
path, and / or leakage from the occurring.
Figure 4-22: Water Valve (Disassembled)
The two o-rings that form the seal to the brew unit can be accessed from
the front / inside area of the appliance - once the brew unit removed. To
access the upper seal, the heater must be removed from the appliance.
The Water Valve can be disassembled for service; parts can be replaced
individually.
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CVA615 Coffee System
Technical Information
5.0
Service and Maintenance
Danger!
To avoid the risk of electrical shock, the appliance should be
disconnected from the power source before any service procedures are
performed.
5.1
Lid - Removal
1. Remove the Lid Screws, as shown in Figure 5-1.
2. Remove the lid.
Figure 5-1: Lid with Screws
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5.2
Interference Suppression Filter (Z1) - Removal
1. Perform: Lid removal – Refer to Section 5.1.
2. Remove the Mains Filter Nut (Figure 5-2 - Item 1).
3. Remove the Filter.
4. Disconnect the Mains Filter electrical connections
Figure 5-2: Interference Suppression Filter (Z1) Mounting Location
5.3
Rear Panel - Removal
1. Remove the lid – Refer to Section 5.1.
2. Remove the Mains Filter – Refer to Section 5.2.
3. Remove the fixing screws from the rear panel.
4. Disconnect the ground connection from the rear panel.
5. Remove the Rear Panel upwards.
Figure 5-3: Rear Panel Removal
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5.4
Adjustment Slide Switch Frame - Removal
1. Open the door.
2. Pull off the slide switch knobs.
3. Press the retaining lugs inwards with a small screwdriver (Figure 5-4).
4. Remove the frame.
Figure 5-4: Removing the Adjustment Slide Switch Frame (Bezel)
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5.5
Door Contact Switch (S24) - Removal
Refer to Figure 5-5 – Door Switch.
1. Remove the lid – Refer to Section 5.1.
2. Open the door.
3. Disconnect the Door Switch Connections.
4. Press the switch retaining lugs inwards with a small screwdriver.
5. Remove the Door Switch to the front.
Figure 5-5: Door Switch (Shown with Appliance Door in Open Position)
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5.6
Base Plate - Removal
1. Remove the Lid, Mains and Rear Panel – Refer to Sections 5.1 and
5.3.
2. Open the door.
3. Remove the Waste Container.
4. Remove the Water Tank.
5. Check if water is present in the Drip Tray with a finger through the
opening under the water container.
6. If water is present, remove it using a suitable device.
7. Remove the Brew Unit – Refer to Section 5.20.
8. Remove the Coffee Beans from their container.
9. Remove the Base Plate Fixing Screws.
10. Tilt the appliance onto its rear.
11. Remove the Base Plate and disconnect the ground wire.
Figure 5-6: Base Plate - Removal
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5.8
Overflow Switch Actuator Float - Removal
1. Remove the Lid, Mains and Rear Panel – Refer to Sections 5.1 and
5.3.
2. Remove the Base Plate – Refer to Section 5.6.
Note:
Ensure the float is re-installed in the same direction as when it was
removed.
3. Remove the float.
1
2
Overflow Switch Float
Magnet Inside of the Float
Figure 5-8: Overflow Switch Actuator Float
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5.9
Overflow Switch (B8/3) - Removal
1. Remove the Lid, Mains and Rear Panel – Refer to Sections 5.1 and
5.3.
2. Remove the Overflow Switch Fixing Screw (Item 1).
3. Remove the Overflow Switch.
4. Disconnect the Overflow Switch connections from the Electronic.
Figure 5-9: Overflow Switch
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5.11
Fascia Panel Cover - Removal
1. Open the door.
2. Remove the Rear Door Panel – Refer to Section 5.10.
3. Remove the Cover Fixing Screws (Item 3).
4. Remove the cover.
1
2
3
4
5
6
Fascia
Cable Guide
Fixing Screws
Cover
Magnet
Cable Guide
Figure 5-11: Fascia Panel Cover Assembly
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5.12
Selector Switch - Removal
1. Open the door.
2. Remove the Rear Door Panel and Fascia Panel Cover – Refer to
Section 5.10 and 5.11. – Refer to Section 5.10 and 5.11.
3. Unplug the electrical connection from the Selector Switch.
4. Remove the Switch Knob (Item 9).
5. Remove the Selector Switch with its housing from the Fascia.
6. Remove the Selector Switch Fixing Screws.
7. Remove the Selector Switch from its Housing.
Figure 5-12: Selector Switch
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5.13
Display Module Electronic - Removal
1. Open the door.
2. Remove the Rear Door Panel and Fascia Panel Cover – Refer to
Section 5.10 and 5.11. – Refer to Section 5.10 and 5.11.
3. Pull off the Pushbutton Knobs (Item 1).
4. Disconnect the Connections from the Electronic (Item 7).
5. Remove the Electronic Unit Fixing Screws (Item 6).
6. Remove the Electronic Unit.
7. Remove the Display Module Fixing Screws (Item 3).
1
2
3
4
5
6
7
Pushbuttons
Display Module
Display Module Fixing Screws
Display Module and Electronic Unit Connection
Control and Power Modules Connection
Electronic Unit Fixing Screws
Electronic Unit
Figure 5-13: Rear View of Front Door with Rear Panel Removed
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5.14
Coffee Dispensing Nozzle - Removal
1. Open the door.
2. Remove the Grille and Drip Tray from the door – Refer to Section 5.7.
3. Remove the fixing screws from the white panel under and behind the
nozzle.
4. Remove the white panel.
Note:
The two screws for the moveable coffee-dispensing nozzle are on the
rear of the dispenser unit.
5. Remove the 2 screws from the Coffee-Dispensing Nozzle by hand.
6. Pull out the hose (Item 6), from the outlet, (Item 7).
7. Pull out the moveable coffee dispensing nozzle (Item 9), to its end
stop.
8. Unclip the outlet and remove it.
9. Remove the moveable coffee dispensing nozzle.
1
2
3
4
5
6
7
8
9
10
Fixing Screw
Drip Tray
Underlay
Outlet
Cable Holder
Connection Hose
Outlet
Retainers
Moveable Dispensing Nozzle
Cover
Figure 5-14: Components of the Coffee Dispensing Nozzle
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5.15
Coffee Dispensing Nozzle - Installation
Refer to Figure 5-14 – Components of the Coffee Dispensing Nozzle.
1. Slide the outlet (Item 7), onto the connection hose (Item 6).
2. Position the moveable coffee dispensing nozzle, (Item 9), in the cover
(Item 10).
3. Clip the outlet (Item 7), in the cover (Item 10).
Note:
The two screws for the coffee dispensing nozzle should be tightened by
hand only as they can easily be over tightened.
4. Fit the Coffee Dispensing Nozzle in the frame.
5. Install the white panel and screws.
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5.16
Steam Valve and Steam Valve Switch (S79) - Removal
1. Open the door.
2. Remove the Rear Door Panel and Fascia Panel Cover – Refer to
Section 5.10 and 5.11. – Refer to Section 5.10 and 5.11.
3. Pull off the Switch Knob (Item 8).
4. Remove the holder fixing screws (Item 3).
5. Remove the holder.
6. Remove the Steam Valve Switch screws (Item 10).
7. Remove the Steam Valve Switch.
8. Disconnect the electrical connections.
1
2
Switch – Steam Generator (S79)
Underlay
3
4
5
Screws – Holder
Screws – Valve Housing
Holder
6
7
8
Valve Housing – Steam
Valve Insert – Steam
Switch Knob
9
Switch Feeler
10
Fixing Screw - Switch
Figure 5-15: Components of Steam Valve and Steam Valve Switch
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5.17
Hot Water Nozzle - Removal
1. Open the door.
2. Remove the Rear Door Panel and Fascia Panel Cover – Refer to
Section 5.10 and 5.11.
3. Loosen the nut (Item 2).
4. Remove the holder (Item 5).
5. Unscrew the sleeve, (Item 1) from the connector (Item 6).
6. Pull out the Hot Water Nozzle (Item 3), from the connector.
1
2
3
4
5
6
7
Sleeve
Nut
Hot Water Nozzle
Fixing Screws – Holder
Holder
Connector
Hot Water Valve (Y12)
Figure 5-16: Hot Water Valve Components
5.18
Hot Water Valve (Y12) - Removal
Refer to Figure 5-16.
1. Open the door.
2. Remove the Rear Door Panel and Fascia Panel Cover – Refer to
Section 5.10 and 5.11.
3. Disconnect the electrical connection (Item 7).
4. Loosen the Hot Water Valve Nuts.
5. Pull out the Hot Water Valve from the connector (Item 6).
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5.19
Checking Temperature at Coffee Dispenser
Warning!
To avoid adverse operating conditions:
ƒ Do not deviate from the procedure.
ƒ Do not change any other settings or values during this procedure.
1. Set the grinding grade to medium.
2. Set the coffee quantity to medium.
3. Set the Medium Coffee temperature to medium (standard setting).
4. Turn off the appliance.
5. Press and hold the Small Coffee Button, Large Coffee Button and
the Hot Water Button. Turn the Selector Switch to the “On with
Light” position.
The following is displayed:
LANGUAGE
RINSING
6. Press the Medium Coffee Button 12 times.
The following is displayed:
DIAGNOSIS
LANGUAGE
7. Press the Small Coffee Button 1 time.
8. Press the Medium Coffee Button 2 times.
The following is displayed:
Note:
This value may vary
1 COFFEE
N0IMPULS.
350
9. Observe the numeric value in the lower right corner of the display.
ƒ
ƒ
If a value of “350” is displayed; proceed to step 14.
If the value is not 350; proceed to step 10.
10. Press the Small Coffee Button 1 time. A blinking box will appear at
the end of the numeric value.
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11. Set the value to “350” as follows:
ƒ
ƒ
Press the Large Coffee Button to increase the value.
Press the Medium Coffee Button to decrease the value.
Note:
Each press of the Large or Medium Coffee will change the displayed
value by 1. (i.e. 347…348…349…350)
12. Press the Small Coffee Button 1 time to store the value.
13. Turn the selector switch to the “Off” position.
14. Turn the selector switch to the On or On with Light position.
15. Prepare 4 coffees (medium size) one after the other.
16. When the fourth coffee is being dispensed, hold the sensor probe
directly in the flow of coffee. The temperature at the coffee dispenser
should be 171°F - 194°F.
5.20
Brew Unit – Removal (in Start/Home Position)
1. Open the door.
2. Remove the Waste Container.
3. Hold the handle and press on the part marked PRESS.
4. Gently pull outward on the Brew Unit to remove it from the appliance.
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5.21
Brew Unit – Removal (NOT in Start/Home Position)
Warning!
This procedure will remove the brew unit from the appliance without
damages. However, after the brew unit is removed, the drives must be
carefully inspected (and repaired if necessary) then placed into the start
(home) position via the service mode.
Before proceeding close the front door, turn the power on to initiate a
drive reset during the start-up sequence.
Once “Ready...” is displayed; open the front door and attempt to Remove
the Brew Unit – Refer to Section 5.20. If the brew unit still cannot be
easily removed, perform the following:
Refer to Figures 5-17 – Brew Unit and 5-18 – Brew Unit Connection
Socket Retaining Screw and Locking Tab on the next page…
1. Open front door - Remove the Waste Container.
2. Locate the Philips screw (Figure 5-17, Item 2).
3. Remove the Philips screw.
4. Use a small flat tip screwdriver to left up on the locking tab (Figure 5-
18).
5. Grasp the brew unit handle and pull the brew unit out till the
connection socket on the brew unit (Figure 5-17, Item 1) unsnaps
from the brew unit and remains inside the appliance attached to the
water nozzle.
6. Remove the Brew Unit – Refer to Section 5.20.
7. Slide the connection down to remove it from the appliance.
8. Re-install the connection socket to the Brew Unit.
9. Carefully inspect the drives for defects.
10. Test the Home Position Switch and Brewing Position Switch for
proper operation.
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5.22
Brew Unit - Installation
1. Remove the Waste Container.
2. Slide the Brew Unit into position in the appliance until the locking
mechanism engages with the mounting plate.
Note:
Do not press the part marked PRESS during the installation of the brew
unit.
5.23
Brew Unit – Cleaning Procedure
Note:
ƒ Clean the Brew Unit by hand only; it SHOULD NOT be cleaned in a
dishwasher.
ƒ Lubricate the Brew Unit with silicon every 500 cups.
1. Remove the Waste Container.
Note:
The Brew Unit can only be removed after the Waste Container has been
removed from the appliance.
2. Grasp the brew unit by the handle and press with the thumb on
“PRESS”. (Figure 5-19, Item 1).
Figure 5-19: Brew Unit – Removal for Cleaning
3. Pull outward to remove the Brew Unit (Figure 5-19, Item 2).
4. Clean the Brew Unit thoroughly under running warm water without
detergent.
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5. Rub away coffee residues from the steel filters with a sponge.
6. Dry the funnel to prevent ground coffee from sticking.
7. After cleaning press "PRESS".
8. Remove the Waste Container (if re-installed).
Figure 5-20: Brew Unit Installation
9. Push the brew unit in the track straight into the appliance without
pressing "PRESS" until it clicks in place (refer to Figure 5-20 – Brew
Unit Installation).
5.24
Brew Unit – Filter Cleaning
1. Remove the Brew Unit – Refer to Section 5.20.
2. Wipe away coffee residues from the steel filter in the funnel of the
brew unit with a sponge.
3. The filters can be removed for thorough cleaning.
4. Fit a 5mm allen wrench to the connection point in the brew unit. Turn
counterclockwise while supporting the chrome filter from below.
Remove the filter by lifting it from the brew unit.
5. Access the second filter by placing a long shaft Philips Screwdriver
through the center of the funnel and remove the screw in the center
of the filter.
6. Manually move the brew unit into the “brew position”.
7. Turn brew upside down – filter will fall out.
8. Clean both sides of the filter with hot water and dry.
9. Re-install the second filter back in position.
10. Manually move the Brew Unit to the “home position”
11. Re-install the Philips screw in the center of the filter.
12. Return the first filter to the brew unit and secure by turning the allen
wrench clockwise.
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5.25
Brew Unit – Degreasing via the Rinse Cycle
Note:
The natural oil found in coffee can cause the Brew Unit to clog. The
message “Rinsing Cycle” will flash in the message window after 500 cups
to remind you to clean the unit using “cleaning tablets”.
These specialty-cleaning tablets can be purchased from Miele.
1. Remove the Waste Container.
2. Remove the Brew Unit and put the detergent tablet in the brew unit
funnel.
Figure 5-21: Cleaning Tablet being Placed into the Brew Unit Funnel
3. Return the brew unit and waste unit to the appliance and close the
door.
4. Set a 25 oz. container under the coffee dispensers.
5. Press the rinse/ pre-warm button. (The unit must be pre-heated and
ready to use otherwise the button will not respond.)
6. The display will read:
RINSING
*
RINSING CYCLE
7. Press ▼ to select “Rinsing Cycle” with the asterisk.
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8. Press ENTER. The display will read:
RINSING CYCLE
A small amount of water will flow out the coffee dispensers. After a
pause, more water will flow out. This process will run 4 times,
dispensing 2 cups (17 oz) of hot water. The whole process lasts about
5 minutes.
At the end of the cleaning cycle the display will read:
SELECT PRODUCT
READY FOR USE
The Brew Unit is now clean and ready to use.
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5.26
Brew Unit - Lubrication
1. Remove the Brew Unit – Refer to Section 5.20.
Note:
Check that the Brew Unit is in the basic position with the funnel slightly
lifted and the socket in vertical position.
2. Refer to Figure 5-22, lubricate the following:
A
B
C
D
Joints
Axel
Tracks
Gasket
Figure 5-22: Brew Unit Lubrication Points
3. Refer to Figure 5-23, lubricate the following:
E
F
Bolt Assembly
Joints
Figure 5-23: Brew Unit Lubrication Points
4. Return the brew unit into the appliance.
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5.27
Brew Unit – Manual Reset to “Home Position” (with
Brew Unit Not Installed in Appliance)
Refer to Figure 5-24.
1. Press on the latch A; and press the funnel down B.
2. Push the connection piece to the far left position C.
3. Press "PRESS" once.
Figure 5-24: Moving the Brew Unit to “Home Position”
4. The “Home” position (Figure 5-25) after resetting the Brew Unit.
The Brew Unit can now be installed into the appliance.
Figure 5-25: Brew Unit in Reset Position
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5.28
5.29
Brew Unit Creamer Valve - Removal
1. Remove the Brew Unit – Refer to Section 5.20.
2. Remove the output fixing screws.
3. Remove the output.
4. Remove the spring and Creamer Valve.
Brew Unit Handle - Removal
1. Remove the Brew Unit from the appliance – Refer to Section 5.20.
2. Press the handle retaining lugs inwards (Figure 5-26).
3. Remove the handle.
Figure 5-26: Brew Unit – Highlighting the Output Assembly (Covering the
Cream Valve) and Retaining Lugs for Securing the Handle to the
Brew Unit Body
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5.30
Brew Unit Funnel - Removal
1. Remove the Brew Unit from the appliance – Refer to Section 5.20.
2. Press the Funnel Locking Lug (Figure 27, Item 1), so that the funnel is
no longer raised.
3. Lever the funnel upwards out of its holder (Figure 5-28).
Note:
When installing the Funnel, ensure the spring (Figure 5-28, Item 1) is
seated correctly.
Figure 5-27: Rear of the Brew Unit, Highlighting the Funnel Lock
Figure 5-28: Front of Brew Unit, Showing Spring Location and Holder
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5.31
Brew Unit Ram - Service
1. Remove the Brew Unit from the appliance – Refer to Section 5.20.
2. Remove the funnel.
3. Remove the bottom filter screw and filter (Figure 5-29, Items 1 and 2).
Figure 5-29: Releasing the Ram from the Bottom of the Brew Unit
4. Unclip the lever from the ram.
5. Pull the ram outward to remove from the Brew Unit.
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6. Clean the brewing chamber (Figure 5-30), ram and bottom filter by
hand with warm water without detergent, then dry.
7. Apply silicone grease to the ram lubrication points.
Figure 5-30: Brewing Unit Chamber Inside the Brew Unit Assembly
1
2
3
Filter Screw
Filter
Lubrication Points
Figure 5-31: Ram Assembly
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5.32
Brew Unit Drives - Service
1. Disconnect the power. Allow the appliance to cool.
2. Remove the Brew Unit from the appliance – Refer to Section 5.20.
3. Remove the Waste Container from the appliance.
4. Remove the Beans Container and Beans Container Guide – Refer to
Section 5.36 and 5.37.
5. Remove the lid – Refer to Section 5.1.
6. Remove the Rear Panel – Refer to Section 5.2.
Important!
Before unplugging any connections, label the plugs and connectors to
ensure the wiring is returned to the correct locations during reassembly.
7. Disconnect L1 and N from the Door Switch to the Interference
Suppressor
8. Disconnect the ground wires from the Cord Socket / Terminal Block.
9. Disconnect the following connections from the Power Electronic:
ƒ
ƒ
ƒ
JP2
JP12
JP4
10. Disconnect the following connections from the CPU Electronic:
ƒ
ƒ
ƒ
ƒ
ƒ
JP34
JP35
JP25
JP39
JP41 (Ribbon Cable)
11. Disconnect the ground connection from the Dispenser Solenoid.
12. Disconnect the ground connection from the Hot Water Heater.
13. Remove the CPU Electronic (with its mounting assembly) and position
toward the rear outside of the appliance.
14. Remove the Steam Heater from its mount and position it outside the
appliance.
15. Disconnect the Water Intake Connection to the Hot Water / Coffee
Heater
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16. Refer to Figure 5-32 – Front Plate Assembly with Retaining Screws
Locations. Remove the two Hot Water / Coffee Heater Screws;
Separate the Heater from its mounting position.
17. Refer to Figure 5-32. Remove the two “Cosmetic Fixing” screws.
Remove the Cosmetic Fixing from inside the appliance.
Figure 5-32: Front Plate Assembly with Retaining Screw Locations
18. Refer to Figure 5-33 – Grinder Retaining Screws and Figure 5-34 –
Grinder Retaining Nuts.
19. Remove the two screws and nuts that secure the Grinder Plate
Assembly to the top of the Front Plate Assembly.
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20. Remove the knobs from the Grinder Slide Controls.
21. Remove the Adjustment Slide Switch Frame (5.4).
22. Position the Grinder as necessary to access the Drive Cover and
Drive Unit Retaining Screws. Refer to Figure 5-34 for the location of
the screws.
23. Remove the two Upper Front Plate Assembly Retaining Screws – as
shown in Figure 5-35.
24. Remove all remaining screws from the Front Plate Assembly. Lift
upward on the Front Plate Assembly to access the screws near the
bottom of the plate. Use Figure 5-32 to locate all screws.
Figure 5-35: Upper Front Plate Assembly Retaining Screws
25. Move the Drive Assembly Cover toward the rear wall of the appliance.
26. Move the Drive Assembly back while lifting upward to remove it from
the appliance. Use caution – a short length of wiring.
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Service Tip:
Refer to Figure 5-36. To avoid having to hold the Front Plate Assembly
upward while removing the lower screws, a suitable item can be used to
temporarily keep the Front Plate Assembly in an elevated position.
Figure 5-36: Using a Suitable Item to Keep the Front Plate Assembly Elevated
to Access the Screws at the Bottom
27. Position the Drive Assembly so access to the rear cover is possible.
28. Remove the 5 screws that secure the cover.
29. Lift the cover from the Drive Unit.
30. Refer to Section 4.15 – Brew Unit Drives for information on the Drive
Assembly.
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5.35
Lower Section of Tank Valve - Removal
1. Open the door.
2. Remove the Water Tank – Refer to Section 5.33.
3. Remove the Lip Seal (Refer to Figure 5-39).
4. Remove the lower part of the Valve Fixing Screws (Figure 5-40, Item
1).
Figure 5-40: Water Tank Lip Seal Removal
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5.36
Beans Container - Removal
1. Open the door.
2. Remove the Beans Container End Stop Screw (Figure 5-42).
3. Hold a suitable container under the beans container opening to collect
loose beans, remove the beans container.
Figure 5-42: Removing the Beans Container
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5.37
Beans Container Guide - Removal
1. Open the door.
2. Perform the “Beans Container Removal” procedure.
3. Remove the Waste Container, Brew Unit and Water Tank.
4. Remove the Top Lid.
5. Remove the guide retaining screws (Figure 5-43, Item 2).
6. Remove the guide and carrier (Figure 5-43, Item 1).
Note:
During installing, first fit the carrier (Figure 43, Item 1) in position and
then fit the guide on the carrier.
1
2
Carrier
Retaining Screws
Figure 5-43: Beans Container Guide
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5.38
Grinder - Disassembly
Note:
The Grinder Ring and Grinder Cone should only be replaced as a set.
1. Open the door.
2. Remove the Beans Container – Refer to Section 5.36.
3. Remove the Waste Container, Brew Unit and Water Tank.
4. Remove the Top Lid.
5. Remove the Beans Container Guide – Refer to Section 5.37.
6. Set the grinding grade adjustment lever to the mid setting.
1
2
Carrier
Retaining Screws
Figure 5-44: Grinder - Disassembly
7. Pull off the handle (Figure 5-44, Item 1).
8. Remove the Adjustment Lever Fixing Screws (Figure 44, Item 2) and
the Adjustment Lever.
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9. Turn the Adjustment Ring (Figure 5-45, Item 1) counterclockwise until
the blue marking aligns with the blue marking on the carrier (Figure 5-
45, Item 2).
1
2
3
Adjustment Ring
Carrier
Bracket
Figure 5-45: Grinder
10. Remove the bracket (Figure 5-45, Item 3).
11. Remove the coffee residues, e.g. with a vacuum cleaner.
Note:
The Grinding Cone Fixing Screw has a left-hand thread.
12. Remove the grinding cone fixing screw (Figure 5-46, Item 1) by
turning it clockwise.
13. Remove the intake worm gear (Figure 5-46, Item 2).
14. Remove the washer (Figure 5-46, Item 3).
Note:
When the Grinding Cone (Figure 5-46, Item 6) is removed, the balls
(Figure 5-41, Item 8) may stick to it and then fall off.
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Refer to Figure 5-46 – Grinder – Apart
15. Remove the Grinding Cone (Item 6).
16. Remove the balls (Item 8).
17. Remove the mounting (Item 7).
18. Remove the springs (Item 9).
19. Remove the carriers (Item 10).
20. Remove the felt ring (Item 11).
1
2
3
Grinding Cone Fixing Screw
Intake Worm Gear
Washer
4
5
6
7
Adjustment Ring
Grinding Ring
Grinding Cone
Mounting
8
Balls
9
Springs
10
11
12
Carriers
Felt Ring
Grinder Motor
Figure 5-46: Grinder - Apart
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CVA615 Coffee System
Technical Information
5.39
Grinder Assembly – Basic Setting
Refer to Figure 5-46 – Grinder - Apart.
Note:
Before setting the grinder, remove all coffee from the grinder.
1. Install the Felt Ring (Item 11).
2. Install the carriers (Item 10).
3. Install the mounting (Item 7).
4. Install the springs (Item 9).
5. Install the balls (Item 8).
6. Install the Grinding Cone (Item 6), ensure the balls are seated.
7. Install the washer (Item 3).
8. Install the Intake Worm Gear (Item 2), press down, and turn until the
coupling engages.
9. Tighten the Grinding Cone Screw (Item 1) counter clockwise. (Ensure
the intake worm gear coupling has engaged properly).
Note:
Before setting the grinder, remove all coffee from the grinder.
10. Fit the bracket (Item 3).
11. The blue marking on the carrier (Item 2), has the same position as the
blue marking on the adjustment ring (Item 1); both point toward the
front of the appliance.
12. Turn the Adjustment Ring Clockwise as far as possible.
13. Turn the Adjustment Ring Counterclockwise by 6 settings so that the
Adjustment Lever can be secured at a mid setting.
14. Fit the Adjustment Lever such that the grinder is set to a medium
grinding grade.
15. Tighten the Adjustment Lever Fixing Screws.
16. Push on the handle.
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5.40
Grinder Unit - Removal
1. Open the door.
2. Remove the Beans Container – Refer to Section 5.36.
3. Remove the Waste Container, Brew Unit and Water Tank.
4. Remove the Top Lid.
5. Remove the Beans Container Guide – Refer to Section 5.37.
6. Remove the Adjustment Slide Switch Frame.
7. Remove the Adjustment Lever Fixing Screws and Lever.
8. Remove the cover fixing screws (Figure 5-47, Item 4).
9. Remove the cover.
Note:
Mark the polarity of the plug (Figure 5-48, Item 1) connected to the
electronic unit.
Figure 5-47: Grinder Removal
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Technical Information
10. Remove the plug from the electronic unit.
11. Lift the grinder upwards from the dampers (Figure 5-48, Item 2).
1
2
3
Motor Holder
Damper
Mounting Plate
Figure 5-48: Grinder Coupling
Note:
When installing the grinder, the dampers should be firmly seated in the
mounting plate and motor holder. Ensure the grinder coupling is
completely secured so grinder noise is kept to a minimum.
5.41
Dispensing Solenoid - Removal
1. Remove the Top Lid.
2. Remove the Rear Panel – Refer to Section 5.10.
3. Remove the Beans Container – Refer to Section 5.36.
4. Remove the Beans Container Guide – Refer to Section 5.37.
5. Press the retainers outward.
6. Slide the Dispensing Solenoid upward out of the guide.
7. Disconnect the electrical connections.
5.42
Dispenser Switch - Removal
1. Remove the Top Lid.
2. Remove the Rear Panel – Refer to Section 5.10.
3. Remove the Beans Container – Refer to Section 5.36.
4. Remove the Beans Container Guide – Refer to Section 5.37.
5. Remove the Dispensing Solenoid.
6. Press the retainers outwards. Remove the switch.
7. Disconnect the electrical connections.
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5.43
Waterpath & Flowmeter - Testing
Caution!
Hot water will flow from the water spout during this procedure.
1. Fill the water reservoir.
2. Place the appliance into the Service Mode with the Selector Knob in
the Programming position. Refer to Section 6 – Fault Diagnosis for
further information on service mode access.
3. Press and hold all three coffee buttons; the display shows the
following:
5678
34
Does a pulsing (flickering) “8” appear in the top line of the display?
NO
YES
Normal Operation – Proceed to
Step 6
Does water flow from the Hot Water Spout?
NO
YES
The water is not flowing
through the water path -
check pump operation and
water path for obstructions.
a. Unplug JP25 from the CPU
Electronic
b. Place a jumper between
pins 2 & 3 (Figure 5-49).
Correct fault & repeat test
starting at step 1.
c. Place the appliance into the
Service Mode with the
Selector Knob in the
Programming position.
Does the display show a solid
“8” in the top line of the display?
NO
YES
Replace the
electronic
Replace the
flowmeter
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Technical Information
Figure 5-49: Test Jumper Position
4. Release all three coffee buttons.
5. Remove the jumper and reconnect JP25.
6. Press and hold all three coffee buttons. Observe the number
displayed in the bottom right of display (refer to Figure 5-50).
Figure 5-50: Display While in Service Mode
Is the displayed value 30 or higher?
NO
YES
Normal operation
Ensure…
ƒ
ƒ
ƒ
ƒ
Sufficient water is present
The water path is clear
Water lines are not crimped
Heaters, flowmeter, etc. freely
pass water
ƒ
ƒ
Water valves fully open
Water line connections are
tight & do not leak
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5.44
Water Path Leakage Test
In the event water is present in bottom of the appliance, or a leak is
suspected; the following procedure will help in locating the source of the
leak.
Caution!
Heaters can be hot during this test and hot water may escape from the
system.
1. Fill the Water reservoir completely
2. Place the appliance into the Service Mode with the Selector Knob in
the Programming position. Refer to Section 6 - Fault Diagnosis for
further information on service mode access.
3. Press and hold all three coffee buttons - check for signs of leakage
(dripping, squirting etc...)
4. Release the three coffee buttons to end the test
If steps 1-4 do not disclose any leaks - continue as follows.
5. Fill the Water reservoir completely
6. Place the appliance into the Service Mode
7. Quickly turn the selector knob to the “Operation” position
8. Press and hold all three coffee buttons for 30 seconds
9. Quickly turn the selector knob to the “Programming” position
10. Press and hold all three coffee buttons - check for signs of leakage
(dripping, squirting etc...)
11. Release the three coffee buttons to end the test
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5.45
Water Path Connections - Opening
Danger!
Risk of burning or scalding!
Components may be hot.
Pressurized steam may exist in the system.
Before any service work is performed, allow time to cool.
Refer to Figure 5-51 – Water Path Connection.
1. Remove the retaining spring (Item 1).
2. Pull out the hose from the connector.
3. Remove the sealing rings (Item 2).
1
2
3
Retaining Spring
Sealing Rings
Pressed-on Ring
Figure 5-51: Water Path Connection
5.46
Water Path Connections - Closing
1. Check the sealing rings for damage and replace as necessary.
2. Fit the sealing rings on the hose.
3. Insert the hose in the connector.
4. Fit the retaining spring behind the pressed-on ring.
5. As a check, pull on the hose. It should not be possible to pull the hose
out of the connector.
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Technical Information
6.0
Fault Diagnosis
6.1
Programming Mode
The Programming Mode is designed for access by the customer to for
changes various setting and change features. To access the
Programming Mode, simply turn the selector knob to the “Program Mode”
position
The Programming Mode Consist of:
German, Dutch, Portuguese, Spanish,
English, Italian or French
Language
Rinsing
On, Off
Water Hardness
Hardness Levels 1 to 4
Temperature Long
Coffee
Minimum, Low, Medium, High, Maximum
Minimum, Low, Medium, High, Maximum
Minimum, Low, Medium, High, Maximum
Temperature Coffee
Temperature Short
(Espresso) Coffee
Pre-Brewing
Pre-Grinding
Program Hot Water
Total Coffee
On, Off
Off, On
Off, On
Number of Coffee Servings
Automatic Descaling Program
Selectable in 15 Minute Periods
Descaling
Standby Timer
Table 6-1: Programming Mode Navigation
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6.2
Service Mode
The Service Mode is used to check the status of various input switches
and operate components in the appliance. The Service Mode is designed
for accessed by qualified service personnel.
Initial requirements
ƒ
ƒ
Switch off the appliance
Ensure the front door is closed
Access
1. Press and hold the SMALL COFFEE button and the HOT WATER
button.
2. Refer to the Service Mode chart on the following page… turn the
selector knob to the desired position.
3. Release the SMALL COFFEE and HOT WATER buttons.
4. Press the applicable button to activate the function listed.
Acknowledgement Indicator
The following is an example indicates the appliance is in the Service
Mode:
Electronic
Version
567
2
128
The display indicates the switches currently actuated.
1. Brewing position switch (brew unit drives)
2. Home position switch (brew unit drives)
3. Dispenser switch
4. Steam valve switch
5. Waste container present switch
6. Brew unit present switch
7. Water tank level switch
8. Flow meter pulse (not always displayed)
A. Drip tray filled (water system fault)
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Service Mode - Navigation
Displays Water Temperature for
Water Heater and Steam Heater in
Celsius.
Large Coffee
Med Coffee
Small Coffee
Hot Water
Rinse
Displays firmware version
(not used)
LOCK
(not used)
(not used)
Large Coffee
Med Coffee
Small Coffee
Hot Water
Rinse
Water Pump ON
Steam Solenoid ON
Hot Water Valve ON
Displays 5
PROGRAM
MODE
Displays 4
Large Coffee
Med Coffee
Small Coffee
Hot Water
Rinse
Button Test “1” displayed
Button Test “2” displayed
Button Test “3” displayed
Button Test “5” displayed
Button Test “4” displayed
LIGHT
Drive motor ON till Brew Position
Switch is contacted
Large Coffee
Med Coffee
Drive motor ON (reverse direction) till
Home Switch is contacted
ON W/ LIGHT
Small Coffee
Hot Water
Rinse
Grinder ON
(not used)
Dispenser Solenoid ON
Hot Water / Coffee Side Heater
Element ON
Large Coffee
Med Coffee
Hot Water / Coffee Upper Heater
Element ON
ON
Small Coffee
Hot Water
Rinse
Steam Heater Element ON
Front Lights (CVA615)
(not used)
Table 6-2: Service Mode Navigation
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6.3
Displayed Messages
Displayed Message
Information
The brew unit is dirty.
The brew unit is blocked.
The brew unit is Jammed.
BREW UNIT BLOCKED
• Clean / inspect brew unit / check drives.
Air is present with the water system –
EXPEL AIR
• Perform “Expel Air” procedure.
The bean container is empty OR
The grinder may be jammed.
FILL COFFEE BEANS
• Add coffee beans to the beans container.
• Clean the conical grinder (top of grinder).
Brew unit is not installed OR
Not installed correctly.
BREW UNIT MISSING
DESCALING
• Reinstall the brew unit.
• Check brew unit present switch.
Perform the Descale Procedure.
Waste unit is not installed.
• Re-install the waste unit.
WASTE UNIT MISSING
• Check magnet on rear of waste unit.
• Check brew unit present switch.
The appliance is in the energy saving mode
STANDBY…
• Press ENTER
Table 6-3: Displayed Messages (Continued on Table 6-4)
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Displayed Message
Information
The level switch has been actuated by water being
present in the base of the appliance.
WATER SYSTEM
FAULT
• Clear unit of water from lower pan and locate /
repair source of leak.
• Check level switch for proper operation.
The water tank level switch is not actuated – water
tank float is below the switch level.
FILL WATER TANK
• Refill the water tank.
• Check that float and switch operate.
• Check that flowmeter is plugged into the correct
EMPTY WATER TANK
WARMING UP…
position of the electronic.
Appliance is warming up, as warming up the “. . .” in
the display disappear.
Table 6-4: Displayed Messages (Continued from Table 6-3)
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Technical Information
6.4
Fault Diagnosis
When two cups of coffee / espresso are being prepared at the same
time, the cups are filled unevenly.
ƒ
ƒ
Appliance is not level.
- Level the appliance
Coffee nozzle is dirty.
- Clean the coffee nozzle.
Brew Unit cannot be removed from the appliance.
ƒ
ƒ
The brew unit is not in the starting (home) position.
- Reset the brew unit to the starting (home) position.
The brew unit is jammed and cannot be removed by resetting the
appliance (i.e. shutting the door and turn on the power).
- Perform the manual removal procedure.
Inspect the brew unit and/or drives to locate fault.
Brew Unit cannot be installed
ƒ
The part marked PRESS was pressed during installation of the Brew
Unit.
- Do not press the part marked PRESS when installing the Brew Unit;
this only applies during Brew Unit removal.
ƒ
ƒ
The Brew Unit is not in the starting (home position).
- Perform a manual resetting of the Brew Unit.
The drive shaft is not in the starting (home) position.
- Reset the Brew Unit to the starting (home) position via the Service
Mode.
- Carefully inspect the Brew Unit and/or drives to locate fault (i.e.
defective switch etc...)
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Grinding grade cannot be set finer (adjustment lever appears
jammed)
ƒ
ƒ
Ground coffee is between the grinding ring and grinding cone.
The ground coffee prevents the gap between the grinding ring and
grinding cone from being reduced.
- Perform the following:
1. Set the adjustment lever to the finest setting possible.
2. Prepare a coffee.
3. Set the adjustment lever to a finer setting.
Warning!
To avoid damage to the grinder, the grinding grade should only be
adjusted in small steps.
INITIAL: 3/23/2007 L.G.
104
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