Miele CVA615 4.16Water Pump, 4.17Flow Meter, 4.18Heaters, Coffee / Hot Water Heater 1R1 & 1R2

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4.16Water Pump

CVA615 Coffee System

Technical Information

4.16Water 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.

4.17Flow 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.

4.18Heaters

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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Contents 2007 Miele USA TECHNICAL INFORMATION CVA615 Coffee SystemCVA615 Coffee System – Table of Contents Service and Maintenance Fault Diagnosis CVA615 Coffee System – List of Figures CVA615 Coffee System – List of Figures continued Figure 5-43:Beans Container Guide Technical Information CVA615 Coffee System – List of TablesTable 6-2:Service Mode Navigation CVA615 Coffee System1Hot Water Dispenser 1.0Construction and Design1.1Appliance Overview 2Coffee Dispensers Height-Adjustable1.1.2Controls 1.1.3Interior Front of Appliance OpenedFigure 1-2: CVA Controls 1.2Technical Data Product DimensionsElectrical Information 12Steam Solenoid Valve 13Power Electronic Board 1.3Layout of Components6Drive Assembly Mounted to Wall 7Drive Assembly Cover 8Hot Water / Coffee HeaterFigure 2-1: Operating Manual 2.0Installation3.1General Operation 3.0Commission and OperationFigure 3-5: Steam Selector 3.1.2Canceling the PreparationFigure 3-4: Canceling the Preparation Process 3.1.3Steam Control3.1.4Hot Water Controls 3.1.5Adjusting the Coffee Grinder3.1.6Filling the Coffee Beans Container 3.1.7Filling the Water Tank 4.1Door Switch 4.2Overflow Reed Switch4.0Description of Function 4.3Brew Unit – Cleaning and Care 4.4Brew Unit Removal from the ApplianceFigure 4-2: Brew Unit in “Home” Position Operation 4.5Connection of Brew Unit to Drive Mechanism4.6Brewing Procedure Figure 4-5: Brew Unit Components 1Outlet 2Top Filter 3Compressed Coffee4Water Nozzle Socket 5Bottom Filter Refer to Figure 4-6– Brew Unit, Showing Compressed Coffee “Puck” 4.8Waste Unit Present Switch 4.7Grounds ContainerFigure 4-7: Waste Unit Present Switch Figure 4-8: Waste Unit 1 Magnet for Present Switch Actuation4.9Water Tank 4.10Water Level Switch Figure 4-10: Water Level SwitchFigure 4-11: Water Level Switch Float When the water tank is installed, and contains at least 30-33ounces of water; the Water Level Switch is activated and its contacts close Figure 4-12: Grinder Assembly 4.11Grinder AssemblyRefer to Figure 4-12– Grinder Assembly 4.12Grinder – Overload Protection 1Grinder Motor 2Carrier 3Mounting 4Spring 5Ball6Grinding Cone 7Washer 8Intake Worm Gear CForce Transfer Interrupted ANormal Operation BOverload Protection ActivatedFigure 4-15: Coffee Dispensing Components 4.13Ground Coffee Dispensing4.14Dispenser Switch 1Brew Unit Drive Shaft Socket 2Socket 4.15Brew Unit Drives3Locking Mechanism Switch Lug 4Switch – Brew Unit Present SwitchRefer to Figure 4-18– Brew Unit Drive Assembly Coffee / Hot Water Heater 1R1 & 1R2 4.16Water Pump4.17Flow Meter 4.18HeatersFigure 4-19: Hot Water / Coffee Heater 4.19Flow Through HeatersFigure 4-20: Steam Heater 1Heater Element 2Thermal Fuse 3Thermostat4Temperature Sensor PTC Figure 4-21: Water Path 4.20Water Path4.20.4Water Path – Steam 4.20.1Water Intake4.20.2Water Path - Coffee 4.20.3Water Path – Hot WaterFigure 4-22: Water Valve Disassembled 4.21Water Valve4.22.1Power Electronic 4.22Electronic AssembliesFigure 4-24: CPU Control Electronic 4.22.2CPU Electronic5.1Lid - Removal 5.0Service and Maintenance5.3Rear Panel - Removal 5.2Interference Suppression Filter Z1 - Removal5.4Adjustment Slide Switch Frame - Removal 1.Open the door 2.Pull off the slide switch knobs4.Remove the frame 5.Remove the Door Switch to the front 5.5Door Contact Switch S24 - RemovalRefer to Figure 5-5– Door Switch 3.Disconnect the Door Switch Connections5.6Base Plate - Removal 5.7Drip Tray - Removal 2.Remove the Base Plate – Refer to Section3.Remove the Drip Tray - Refer to Figure 2Magnet Inside of the Float 5.8Overflow Switch Actuator Float - Removal1Overflow Switch Float 3. Remove the float5.9Overflow Switch B8/3 - Removal 2.Remove the Overflow Switch Fixing Screw Item3.Remove the Overflow Switch 3.Remove the Lower Rear Panel Fixing Screws Item 5.10Rear Door Panel - Removal1.Open the door 2.Remove the Upper Rear Panel Fixing Screws Item4.Remove the cover 5.11Fascia Panel Cover - Removal2.Remove the Rear Door Panel – Refer to Section 3.Remove the Cover Fixing Screws Item5.12Selector Switch - Removal 5.13Display Module Electronic - Removal 5.14Coffee Dispensing Nozzle - Removal 5.15Coffee Dispensing Nozzle - Installation 1.Open the door 5.18Hot Water Valve Y12 - Removal 5.17Hot Water Nozzle - Removal5.19Checking Temperature at Coffee Dispenser 5.20Brew Unit – Removal in Start/Home Position 5.21Brew Unit – Removal NOTin Start/Home Position 1Connection Socket 2Retaining Screw Figure 5-17: Brew Unit5.23Brew Unit – Cleaning Procedure 5.22Brew Unit - Installation5.24Brew Unit – Filter Cleaning RINSING RINSING CYCLE 5.25Brew Unit – Degreasing via the Rinse CycleSELECT PRODUCT READY FOR USE RINSING CYCLE5.26Brew Unit - Lubrication Refer to Figure 5.29Brew Unit Handle - Removal 5.28Brew Unit Creamer Valve - Removal5.30Brew Unit Funnel - Removal 5.31Brew Unit Ram - Service 1Filter Screw 2Filter 3Lubrication Points Figure 5-31: Ram Assembly5.32Brew Unit Drives - Service 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 Figure 5-34: Grinder Retaining Nuts Figure 5-33: Grinder Retaining Screws21.Remove the Adjustment Slide Switch Frame Service Tip 4.Remove the Water Tank Float 5.33Water Tank Float - Removal1.Open the door 2.Remove the Water Tank 3.Remove the cap from the Water Tank4.Remove the Lip Seal 5.34Water Tank Lip Seal - Removal2.Remove the Water Tank – Refer to Section 3.Lever off the Lip Seal Cap3.Remove the Lip Seal Refer to Figure 5.35Lower Section of Tank Valve - Removal7.Remove the lower part of the valve 5.Remove the Bottom Plate and Drip Tray5.36Beans Container - Removal 5.37Beans Container Guide - Removal 5.38Grinder - Disassembly 10.Remove the bracket Figure 5-45,Item Refer to Figure 5-46– Grinder – Apart 5.39Grinder Assembly – Basic Setting 5.40Grinder Unit - Removal 5.41Dispensing Solenoid - Removal 5.42Dispenser Switch - Removal5678 34 5.43Waterpath & Flowmeter - Testing4.Release all three coffee buttons 5.44Water Path Leakage Test 5.46Water Path Connections - Closing 5.45Water Path Connections - Opening6.1Programming Mode 6.0Fault DiagnosisInitial requirements 6.2Service ModeAccess Acknowledgement IndicatorService Mode - Navigation 6.3Displayed Messages Displayed MessageInformation The level switch has been actuated by water being 6.4Fault Diagnosis Brew Unit cannot be installedBrew Unit cannot be removed from the appliance Perform the following