Miele CVA615 User Manual

TECHNICAL INFORMATION

CVA615 Coffee System

Technical Information

CVA615 Coffee System – Table of Contents

1.0 Construction and Design.........................................................................9

1.1 Appliance Overview................................................................................... 9

1.1.1 Front View...................................................................................... 9

1.1.2 Controls .......................................................................................10

1.1.3 Interior (Front of Appliance Opened) ........................................... 10

1.2 Technical Data........................................................................................ 11

1.3 Layout of Components ...........................................................................12

2.0 Installation..............................................................................................13

3.0 Commission and Operation ..................................................................14

3.1 General Operation ................................................................................... 14

3.1.1 Preparing Coffee.......................................................................... 14

3.1.2 Canceling the Preparation ........................................................... 15

3.1.3 Steam Control.............................................................................. 15

3.1.4 Hot Water..................................................................................... 16

3.1.5 Adjusting the Coffee Grinder .......................................................17

3.1.6 Filling the Coffee Beans Container ..............................................18

3.1.7 Filling the Water Tank.................................................................. 19

4.0 Description of Function.........................................................................20

4.1 Door Switch ............................................................................................. 20

4.2 Overflow (Reed) Switch........................................................................... 20

4.3 Brew Unit – Cleaning and Care ...............................................................21

4.4 Brew Unit Removal from the Appliance................................................... 21

4.5 Connection of Brew Unit to Drive Mechanism ......................................... 22

4.6 Brewing Procedure .................................................................................. 23

4.7 Grounds Container .................................................................................. 26

4.8 Waste Unit Present Switch ...................................................................... 26

4.9 Water Tank .............................................................................................. 28

4.10 Water Level Switch.................................................................................. 29

4.11 Grinder Assembly .................................................................................... 31

4.12 Grinder – Overload Protection................................................................. 33

4.13 Ground Coffee Dispensing ...................................................................... 35

4.14 Dispenser Switch.....................................................................................36

4.15 Brew Unit Drives...................................................................................... 37

4.16 Water Pump............................................................................................. 39

4.17 Flow Meter............................................................................................... 39

4.18 Heaters .................................................................................................... 39

4.19 Flow Through Heaters ............................................................................. 40

4.20 Water Path............................................................................................... 42

4.20.1 Water Intake ...............................................................................43

4.20.2 Water Path - Coffee .................................................................... 43

CVA615 Coffee System

Technical Information

CVA615 Coffee System – Table of Contents (continued)

4.20.3 Water Path – Hot Water.............................................................. 43

4.20.4 Water Path – Steam ...................................................................43

4.21 Water Valve ............................................................................................. 44

4.22 Electronic Assemblies .............................................................................45

4.22.1 Power Electronic.......................................................................... 45

4.22.2 CPU Electronic ............................................................................46

5.0 Service and Maintenance ......................................................................47

5.1 Lid - Removal ..........................................................................................47

5.2 Interference Suppression Filter (Z1) - Removal ......................................48

5.3 Rear Panel - Removal ............................................................................. 48

5.4 Adjustment Slide Switch Frame - Removal .............................................49

5.5 Door Contact Switch (S24) - Removal..................................................... 50

5.6 Base Plate - Removal.............................................................................. 51

5.7 Drip Tray - Removal ................................................................................52

5.8 Overflow Switch Actuator Float - Removal .............................................. 53

5.9 Overflow Switch (B8/3) - Removal........................................................... 54

5.10 Rear Door Panel - Removal ....................................................................55

5.11 Fascia Panel Cover - Removal................................................................ 56

5.12 Selector Switch - Removal ......................................................................57

5.13 Display Module Electronic - Removal...................................................... 58

5.14 Coffee Dispensing Nozzle - Removal...................................................... 59

5.15 Coffee Dispensing Nozzle - Installation................................................... 60

5.16 Steam Valve and Steam Valve Switch (S79) - Removal ......................... 61

5.17 Hot Water Nozzle - Removal ................................................................... 62

5.18 Hot Water Valve (Y12) - Removal ...........................................................62

5.19 Checking Temperature at Coffee Dispenser ........................................... 63

5.20 Brew Unit – Removal (in Start/Home Position)........................................ 64

5.21 Brew Unit – Removal (NOT in Start/Home Position) ............................... 65

5.22 Brew Unit - Installation............................................................................. 67

5.23 Brew Unit – Cleaning Procedure ............................................................. 67

5.24 Brew Unit – Filter Cleaning...................................................................... 68

5.25 Brew Unit – Degreasing via the Rinse Cycle........................................... 69

5.26 Brew Unit - Lubrication ............................................................................ 71

5.27 Brew Unit – Manual Reset to “Home Position” (with Brew Unit Not

Installed in Appliance) .............................................................................72

5.28 Brew Unit Creamer Valve - Removal....................................................... 73

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

5.34 Water Tank Lip Seal - Removal............................................................... 83

5.35 Lower Section of Tank Valve - Removal .................................................84

5.36 Beans Container - Removal ....................................................................86

CVA615 Coffee System

Technical Information

CVA615 Coffee System – Table of Contents (continued)

5.37 Beans Container Guide - Removal.......................................................... 87

5.38 Grinder - Disassembly ............................................................................. 88

5.39 Grinder Assembly – Basic Setting ........................................................... 91

5.40 Grinder Unit - Removal............................................................................ 92

5.41 Dispensing Solenoid - Removal ..............................................................93

5.42 Dispenser Switch - Removal ...................................................................93

5.43 Waterpath & Flowmeter - Testing............................................................ 94

5.44 Water Path Leakage Test........................................................................96

5.45 Water Path Connections - Opening......................................................... 97

5.46 Water Path Connections - Closing ..........................................................97

6.0 Fault Diagnosis ......................................................................................98

6.1 Programming Mode .................................................................................98

6.2 Service Mode........................................................................................... 99

6.3 Displayed Messages .............................................................................101

6.4 Fault Diagnosis......................................................................................103

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 3-6: Placement of Cup Under the Hot Water Dispenser .................................... 16

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 4-6: Brew Unit, Showing Compressed Coffee “Puck” ........................................ 25

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

Figure 4-14: Ball Positions into the Grinder Cone, Under Different Operating

Conditions................................................................................................... 34

Figure 4-15: Coffee Dispensing Components.................................................................35

Figure 4-16: Dispensing Lever........................................................................................ 36

Figure 4-17: Components of the Brew Unit Drive Assembly, Water Connection and

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

CVA615 Coffee System

Technical Information

CVA615 Coffee System – List of Figures (continued)

Figure 5-1: Lid with Screws...........................................................................................47

Figure 5-2: Interference Suppression Filter (Z1) Mounting Location ............................ 48

Figure 5-3: Rear Panel Removal .................................................................................. 48

Figure 5-4: Removing the Adjustment Slide Switch Frame (Bezel) .............................. 49

Figure 5-5: Door Switch (Shown with Appliance Door in Open Position) ..................... 50

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 5-13: Rear View of Front Door with Rear Panel Removed .................................. 58

Figure 5-14: Components of the Coffee Dispensing Nozzle...........................................59

Figure 5-15: Components of Steam Valve and Steam Valve Switch..............................61

Figure 5-16: Hot Water Valve Components .................................................................... 62

Figure 5-17: Brew Unit.................................................................................................... 66

Figure 5-18: Brew Unit Connection Socket Retaining Screw and Locking Tab.............. 66

Figure 5-19: Brew Unit – Removal for Cleaning .............................................................67

Figure 5-20: Brew Unit Installation.................................................................................. 68

Figure 5-21: Cleaning Tablet being Placed into the Brew Unit Funnel ........................... 69

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 5-26: Brew Unit – Highlighting the Output Assembly (Covering the Cream Valve)

and Retaining Lugs for Securing the Handle to the Brew Unit Body .......... 73

Figure 5-27: Rear of the Brew Unit, Highlighting the Funnel Lock.................................. 74

Figure 5-28: Front of Brew Unit, Showing Spring Location and Holder .......................... 74

Figure 5-29: Releasing the Ram from the Bottom of the Brew Unit................................ 75

Figure 5-30: Brewing Unit Chamber Inside the Brew Unit Assembly.............................. 76

Figure 5-31: Ram Assembly ...........................................................................................76

Figure 5-32: Front Plate Assembly with Retaining Screw Locations ..............................78

Figure 5-33: Grinder Retaining Screws........................................................................... 79

Figure 5-34: Grinder Retaining Nuts............................................................................... 79

Figure 5-35: Upper Front Plate Assembly Retaining Screws.......................................... 80

Figure 5-36: Using a Suitable Item to Keep the Front Plate Assembly Elevated to Access

the Screws at the Bottom ...........................................................................81

Figure 5-37: Removing the Cap to Access the Float in the Water Container ................. 82

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 5-41: Underside View of the CVA615 with Base Plate and Drip Tray Removed .85

Figure 5-42: Removing the Beans Container.................................................................. 86

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

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

Table 6-3: Displayed Messages (Continued on Table 6-4) .......................................101

Table 6-4: Displayed Messages (Continued from Table 6-3) .................................... 102

CVA615 Coffee System

1.0 Construction and Design

1.1 Appliance Overview

1.1.1 Front View

1 Hot Water Dispenser 2 Coffee Dispensers (Height-Adjustable) 3 Handle to Open Appliance Front 4 Steam Selector 5 Steam Nozzle with Milk Frother 6 Drip Catch

Figure 1-1: Front Overview CVA615

Technical Information

1.1.2 Controls

7 Program Selector 8 Message Window 9 Coffee Serving Buttons 10 Rinse / Pre-Warm Button 11 Hot Water Button

Figure 1-2: CVA Controls

1.1.3 Interior (Front of Appliance Opened)

12 Coffee Bean Container 13 Slide Control to Select Fineness of Ground Coffee 14 Slide Control to Select Quantity of Ground Coffee 15 Water Tank 16 Waste Unit 17 Brew Unit

Figure 1-3: Interior View of CVA615 with Door Opened

CVA615 Coffee System

1.2 Technical Data

Product Dimensions

Figure 1-4: CVA615 Product Dimensions

Electrical Information

The appliance comes equipped with a 6ft (1.8 m) power cord with a NEMA 5-15P molded plug for connection to a 120 V, 15 A, 60 Hz power supply.

Technical Information

1.3 Layout of Components

Overhead View of Main Components

1 Waste Container 2 Brew Unit 3 Grinder 4 Water Tank 5 CPU Electronic Board 6 Drive Assembly (Mounted to Wall) 7 Drive Assembly Cover 8 Hot Water / Coffee Heater 9 Water Pump 10 Flowmeter 11 Steam Heater 12 Steam Solenoid Valve 13 Power Electronic Board

Figure 1-5: CVA615 Overhead View of Components

CVA615 Coffee System

2.0 Installation

Refer to the Installation section of the Operating Manual.

Figure 2-1: Operating Manual

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

CVA615 Coffee System

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

Technical Information

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

CVA615 Coffee System

3.1.5 Adjusting the Coffee Grinder

Controls

 Slide to the left for finer grinding.  Slide to the right for coarser grinding.

Figure 3-8: Grinder Controls

 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.

 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.

 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:

 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.

Technical Information

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.

CVA615 Coffee System

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.

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).

4.2 Overflow (Reed) Switch

Figure 4-1: Door Contact Switch (S24)

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.

CVA615 Coffee System

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

Technical Information

CVA615 Coffee System

Technical Information

4.5 Connection of Brew Unit to Drive Mechanism

1 Drive Shaft Socket 2 Water Connection Socket 3 Locking Mechanism Switch Lug 4 Brew Unit Switch 5 Water Nozzle 6 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.

CVA615 Coffee System

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 Funnel 2 Percolator Chamber 3 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).

Technical Information

1 Outlet 2 Top Filter 3 Compressed Coffee 4 Water Nozzle Socket 5 Bottom Filter

Figure 4-5: Brew Unit Components

CVA615 Coffee System

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”

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

CVA615 Coffee System

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.

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.

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…

CVA615 Coffee System

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

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.

CVA615 Coffee System

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