Emerson E2 Manuel D’Utilisation

sor failures.

 Device configuration of the CoreSense Communica-

tions can be set at either 9600 or 19200 baud, with either 
No parity, or Even parity.

The Copeland CoreSense Communications is sup-

ported on the E2 CX-300, 400, and BX-300, 400.

The thermostat communicates with the E2 using the 

MODBUS network. The Light Commercial Communicat-
ing Thermostat will enable the E2 to read status informa-
tion from the device as well as send operational setpoints 
to the device. The thermostat is available on E2 versions 
3.02 and above.

The E2 application will provide support for external 

real time inputs to the thermostat. These inputs are:

•Zone Temperature

•Minimum Damper Position

•Outside Air Temperature

•Inside Humidity

If these inputs are connected to valid values, they are 

sent to the thermostat to be used in place of any locally 
connected sensors of the same type. If local sensors are 
present and meant to be used, the associated inputs on the 
E2 application should be left disconnected.

The Light Commercial Thermostat also supports diag-

nostic functions. When a diagnostic code is sent to the E2 
from the thermostat, the E2 application will identify the 
code and generate the corresponding advisories in the 
advisory log.

Each of these configurable diagnostic alarms in the E2 

can be set to Disabled, Failure, Alarm, or Notice with an 
accompanying priority setting.

The diagnostic alarms supported are:

The thermostat supports the Emerson Climate Tech-

nologies Comfort Alert system. On any alert present on 
Comfort Alert terminal, the thermostat keeps the informa-
tion on the fault available over the network so that the E2 

can access this information. On some specific alerts, it will 
discontinue compressor operation if active protection is 
enabled.



The Comfort Alert codes are sent separately from the diag-
nostic codes. Just like the diagnostic codes, the Comfort 
Alert codes are entered as advisories in the E2 advisory 

Heating Two Hours

Thermostat did not see a rise in supply temperature when heating was 

called for.

Heating Problem Detected

Heat Continuous

In heat or backup heat mode, thermostat opens latching relay contacts if 

temperature is over 10°F above setpoint.

Heat Shutdown – Temp too high

Temperature Sensor Fail

If heating or cooling is engaged, and either the indoor temperature sensor 

reading or the supply air temperature sensor reading starts moving the 
opposite way faster than it was before the heating or cooling was engaged, 
the thermostat reports a diagnostic message, and shuts down the operation.

Incorrect Sensor Wiring

Stuck Key

A stuck key (closed) has been detected on the thermostat.

Stuck Key Detected

Unexpected Temperature 

Rise

Thermostat has detected a failure of the internal space temperature sensor, 

or the O/B wiring is incorrect.

Failed Sensor or Bad Wiring

Cool Eight Hours

If cool runs for over 8 hours continuously, the thermostat sets anticipator to 

zero until call for cool is satisfied.

Cooling Problem Detected

Fan Not Detected

If the fan is activated and if the Fan Detect input is enabled, the thermostat 

checks its status 15 seconds after the fan is energized, and if the fan is not 
on, it disables any active heat or cool calls, and reports an alarm.

Proof Fail

Frost Protection Activated The thermostat allows a frost protection menu option. When enabled, frost 

protection is enabled in all system modes including OFF, when temperature 
drops below 42°F (5.5°C). All other heat / cool calls are disabled, and 
indoor heat is activated until the temperature rises above the frost protec-
tion threshold.

Frost Protection