Miele CVA615 manual 4.19Flow Through Heaters, 19: Hot Water / Coffee Heater

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4.19Flow Through Heaters

CVA615 Coffee System

Technical Information

4.19Flow 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.

1Heater Element

2Water Valve

3Temperature Sensor (PTC)

4Heater Element

5Thermal Fuse

6Thermostat

Figure 4-19:Hot Water / Coffee Heater

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Contents TECHNICAL INFORMATION CVA615 Coffee System 2007 Miele USACVA615 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 CVA615 Coffee System – List of Tables Table 6-2:Service Mode NavigationCVA615 Coffee System Technical Information1.0Construction and Design 1.1Appliance Overview2Coffee Dispensers Height-Adjustable 1Hot Water Dispenser1.1.3Interior Front of Appliance Opened 1.1.2ControlsFigure 1-2: CVA Controls Product Dimensions 1.2Technical DataElectrical Information 1.3Layout of Components 6Drive Assembly Mounted to Wall7Drive Assembly Cover 8Hot Water / Coffee Heater 12Steam Solenoid Valve 13Power Electronic Board2.0Installation Figure 2-1: Operating Manual3.0Commission and Operation 3.1General Operation3.1.2Canceling the Preparation Figure 3-4: Canceling the Preparation Process3.1.3Steam Control Figure 3-5: Steam Selector3.1.4Hot Water 3.1.5Adjusting the Coffee Grinder Controls3.1.6Filling the Coffee Beans Container 3.1.7Filling the Water Tank 4.2Overflow Reed Switch 4.1Door Switch4.0Description of Function 4.4Brew Unit Removal from the Appliance 4.3Brew Unit – Cleaning and CareFigure 4-2: Brew Unit in “Home” Position 4.5Connection of Brew Unit to Drive Mechanism Operation4.6Brewing Procedure 1Outlet 2Top Filter 3Compressed Coffee Figure 4-5: Brew Unit Components4Water Nozzle Socket 5Bottom Filter Refer to Figure 4-6– Brew Unit, Showing Compressed Coffee “Puck” 4.7Grounds Container 4.8Waste Unit Present SwitchFigure 4-7: Waste Unit Present Switch 1 Magnet for Present Switch Actuation Figure 4-8: Waste Unit4.9Water Tank Figure 4-10: Water Level Switch 4.10Water 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 4.11Grinder Assembly Figure 4-12: Grinder AssemblyRefer to Figure 4-12– Grinder Assembly 1Grinder Motor 2Carrier 3Mounting 4Spring 5Ball 4.12Grinder – Overload Protection6Grinding Cone 7Washer 8Intake Worm Gear ANormal Operation BOverload Protection Activated CForce Transfer Interrupted4.13Ground Coffee Dispensing Figure 4-15: Coffee Dispensing Components4.14Dispenser Switch 4.15Brew Unit Drives 3Locking Mechanism Switch Lug4Switch – Brew Unit Present Switch 1Brew Unit Drive Shaft Socket 2SocketRefer to Figure 4-18– Brew Unit Drive Assembly 4.16Water Pump 4.17Flow Meter4.18Heaters Coffee / Hot Water Heater 1R1 & 1R24.19Flow Through Heaters Figure 4-19: Hot Water / Coffee Heater1Heater Element 2Thermal Fuse 3Thermostat Figure 4-20: Steam Heater4Temperature Sensor PTC 4.20Water Path Figure 4-21: Water Path4.20.1Water Intake 4.20.2Water Path - Coffee4.20.3Water Path – Hot Water 4.20.4Water Path – Steam4.21Water Valve Figure 4-22: Water Valve Disassembled4.22Electronic Assemblies 4.22.1Power Electronic4.22.2CPU Electronic Figure 4-24: CPU Control Electronic5.0Service and Maintenance 5.1Lid - Removal5.2Interference Suppression Filter Z1 - Removal 5.3Rear Panel - Removal1.Open the door 2.Pull off the slide switch knobs 5.4Adjustment Slide Switch Frame - Removal4.Remove the frame 5.5Door Contact Switch S24 - Removal Refer to Figure 5-5– Door Switch3.Disconnect the Door Switch Connections 5.Remove the Door Switch to the front5.6Base Plate - Removal 2.Remove the Base Plate – Refer to Section 5.7Drip Tray - Removal3.Remove the Drip Tray - Refer to Figure 5.8Overflow Switch Actuator Float - Removal 1Overflow Switch Float3. Remove the float 2Magnet Inside of the Float2.Remove the Overflow Switch Fixing Screw Item 5.9Overflow Switch B8/3 - Removal3.Remove the Overflow Switch 5.10Rear Door Panel - Removal 1.Open the door2.Remove the Upper Rear Panel Fixing Screws Item 3.Remove the Lower Rear Panel Fixing Screws Item5.11Fascia Panel Cover - Removal 2.Remove the Rear Door Panel – Refer to Section3.Remove the Cover Fixing Screws Item 4.Remove the cover5.12Selector Switch - Removal 5.13Display Module Electronic - Removal 5.14Coffee Dispensing Nozzle - Removal 5.15Coffee Dispensing Nozzle - Installation 1.Open the door 5.17Hot Water Nozzle - Removal 5.18Hot Water Valve Y12 - Removal5.19Checking Temperature at Coffee Dispenser 5.20Brew Unit – Removal in Start/Home Position 5.21Brew Unit – Removal NOTin Start/Home Position Figure 5-17: Brew Unit 1Connection Socket 2Retaining Screw5.22Brew Unit - Installation 5.23Brew Unit – Cleaning Procedure5.24Brew Unit – Filter Cleaning 5.25Brew Unit – Degreasing via the Rinse Cycle RINSING RINSING CYCLERINSING CYCLE SELECT PRODUCT READY FOR USE5.26Brew Unit - Lubrication Refer to Figure 5.28Brew Unit Creamer Valve - Removal 5.29Brew Unit Handle - Removal5.30Brew Unit Funnel - Removal 5.31Brew Unit Ram - Service Figure 5-31: Ram Assembly 1Filter Screw 2Filter 3Lubrication Points5.32Brew 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 5-33: Grinder Retaining Screws Figure 5-34: Grinder Retaining Nuts21.Remove the Adjustment Slide Switch Frame Service Tip 5.33Water Tank Float - Removal 1.Open the door 2.Remove the Water Tank3.Remove the cap from the Water Tank 4.Remove the Water Tank Float5.34Water Tank Lip Seal - Removal 2.Remove the Water Tank – Refer to Section3.Lever off the Lip Seal Cap 4.Remove the Lip Seal5.35Lower Section of Tank Valve - Removal 3.Remove the Lip Seal Refer to Figure5.Remove the Bottom Plate and Drip Tray 7.Remove the lower part of the valve5.36Beans 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 5.42Dispenser Switch - Removal 5.41Dispensing Solenoid - Removal5.43Waterpath & Flowmeter - Testing 5678 344.Release all three coffee buttons 5.44Water Path Leakage Test 5.45Water Path Connections - Opening 5.46Water Path Connections - Closing6.0Fault Diagnosis 6.1Programming Mode6.2Service Mode AccessAcknowledgement Indicator Initial requirementsService Mode - Navigation Displayed Message 6.3Displayed MessagesInformation The level switch has been actuated by water being Brew Unit cannot be installed 6.4Fault DiagnosisBrew Unit cannot be removed from the appliance Perform the following