Emerson E2 operation manual Light Commercial Thermostat, Thermostat Inputs, Advisory and Alarms

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.

6.3.9Light Commercial Thermostat

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

3.02and above.

6.3.9.1Thermostat Inputs

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.

6.3.9.2Advisory and Alarms

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.

Diagnostic Alarms

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:

Diagnostic Alarm	Descriptions	E2 Advisory
Heating Two Hours	Thermostat did not see a rise in supply temperature when heating was	Heating Problem Detected
	called for.
Heat Continuous	In heat or backup heat mode, thermostat opens latching relay contacts if	Heat Shutdown – Temp too high
	temperature is over 10°F above setpoint.
Temperature Sensor Fail	If heating or cooling is engaged, and either the indoor temperature sensor	Incorrect Sensor Wiring
	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.
Stuck Key	A stuck key (closed) has been detected on the thermostat.	Stuck Key Detected
Unexpected Temperature	Thermostat has detected a failure of the internal space temperature sensor,	Failed Sensor or Bad Wiring
Rise	or the O/B wiring is incorrect.
Cool Eight Hours	If cool runs for over 8 hours continuously, the thermostat sets anticipator to	Cooling Problem Detected
	zero until call for cool is satisfied.
Fan Not Detected	If the fan is activated and if the Fan Detect input is enabled, the thermostat	Proof Fail
	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.
Frost Protection Activated	The thermostat allows a frost protection menu option. When enabled, frost	Frost Protection
	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.

Table 6-5-Diagnostic Alarm Outputs

Comfort Alert Codes

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

MODBUS The RS485 Network and Hardware Setup • 6-9