Emerson E2 Copeland Discus with Core- Sense Protection, Light Commercial Thermo Stat

6.3.7Copeland Discus with Core- Sense Protection

Figure 6-7- Copeland Discus Compressor

The Discus application can monitor semi-hermetic

compressors using the MODBUS network on E2 versions

3.01and above. The E2 monitors and records semi-her- metic compressor information. The Discus application has extensive logging capabilities that record a compressor’s Run History, Fault History, and Alarm Status.

The Copeland Discus is supported on E2 RX-300, CX- 400 and above.

6.3.8Light Commercial Thermo-

stat

The Light Commercial Thermostat communicates with the E2 using the MODBUS network. The thermostat will enable the E2 to read status information from the device as well as send operational setpoints to the device. The ther- mostat is available on E2 versions 3.02 and above.

6.3.8.1Thermostat 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.

6.3.8.2Advisory 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.

Table 6-5-Diagnostic Alarm Outputs

6-8 • E2 RX/BX/CX I&O Manual 026-1610 Rev 13 14-SEP-2011