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Technical Manual
10.2 Gravity Heater Tank De-Scale Procedure
To maintain correct water levels and water temperature the gravity heater tank must be
inspected regularly and if necessary be de-scaled. To ensure long and trouble-free
operation Crane Merchandising Systems recommend that all machines have a water filter
fitted.
There are a number of ways of de-scaling the Gravity tank. The tank can be removed and
scraped out with a blunt tool but it can also be left inside the machine and a de-scaling
agent introduced into the tank. This eliminates the need to remove the thermistor, water
level probe and all the outlet valves from the tank saving time and money. Always
remember to fit a new water filter and boiler seal after de-scaling.
Use the following steps as a guideline only and always refer to the instructions supplied
with the de-scaling agents regarding dosage and de-scaling time.
1. Switch off the machine and open the door. Remove all canisters and back covers.
2. Drain all the water from the tank.
Safety First! The water from the tank will be hot.
3. Once all of the water has drained from the tank replace the bung into the drain hose.
Introduce the de-scaling solution in the recommended dosage into the heater tank
and allow the heater tank to fill.
4. Turn off the machine and leave for approximately 40 minutes before draining the tank
again.
5. Fit a new water filter and switch on the machine. Fill the tank and drain again until all
traces of the de-scaler are removed (at least 3 times).
6. Switch on the machine and allow the heater tank to fill and to heat up. Drain and fill
one more time. The machine is now ready to be put back in service.
10.3 System Drain Down - Espresso Machines
Should it become necessary for the engineer to do any work on the Espresso water system
it is very important that the following sequence is followed to ensure safe working as well
as correct system fill and heating when the machine is powered up.
10.3.1 Cooling down the Espresso system
1. Open the front door and press ‘CoEx® Boiler Cool Down’ on the display.
Approximately 30 fl ozof hot water will be flushed through the system ensure you have a
suitable container in the correct place to catch it.
Important: Pressing ‘Machine Cool Down’ or ‘CoEx® Boiler Cool Down’ also informs the
machine software that the Espresso system has been drained ensuring that the Espresso
system will automatically fill before heating on power up. This is very important and
must not be overlooked.
2. Once the Espresso system has been cooled the LCD will display the message ‘Machine
cooled’ and water will stop pumping through the system. Ensure all pipes etc. are
refitted correctly.
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Summary of Contents for COTI
Page 1: ...Part No 403018 Issue April 2021 Technical Manual From software version 3 7 1 ...
Page 2: ......
Page 30: ...Section 3 Programming Mode 20 ...
Page 35: ...Section 4 Customising the User Interface Technical Manual 7 8 9 10 11 25 ...
Page 128: ...Section 8 Espresso System 8 2 1 Espresso Water Flow Diagram 118 ...
Page 148: ...Section 11 Electrical Electronic Diagrams Atlas H Board Pin Connections COTI 138 ...
Page 150: ...Section 11 Electrical Electronic Diagrams Atlas H Board Pin Connections LINEA 9 10 1 140 ...
Page 152: ...Section 11 Electrical Electronic Diagrams 11 8 Input Circuit 1 COTI 142 ...
Page 154: ...Section 11 Electrical Electronic Diagrams 11 10 Input Circuit 1 LINEA 144 ...
Page 156: ...Section 11 Electrical Electronic Diagrams 11 12 Output Circuit 1 COTI 146 ...
Page 158: ...Section 11 Electrical Electronic Diagrams 11 14 Output Circuit 1 LINEA 148 ...
Page 168: ...NOTES 158 ...
Page 169: ......