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Technical Manual
11.21 Heater Circuit - LINEA
The water temperatures in the Gravity Boiler and the Pressure Boiler (Espresso machines)
are controlled by NTC thermistor probes. They have a variable resistance - high resistance
when cold, low resistance when hot. The thermistor probe is in contact with the water and
continually monitor the water temperature. At room ambient temperature the thermistor
resistance is approx. 3000 ohms. At 205°F the thermistor resistance is approx. 200 ohms.
Both Boiler Heating Elements are controlled by a Solid-State Relay which are in turn con-
trolled from the I/O Board. The Gravity Boiler Element is rated at 1.2kW, and the Espresso
Boiler Element is rated at 1.0kW.
Should control of the Heating Elements fail for any reason, both Elements are protected by
inline resettable Thermal Cut-Outs. These are positioned in the overflow pipe of the Gravity
Boiler (176°F), and on the casing of the Espresso Boiler (244°F).
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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: ......