Emerson E2 Refrigerant Leak Detection System Rlds, High/Low Occ/Unocc Space Temperature Alarms

Comfort Alert	Descriptions	Cause	E2 Advisory
Welded Contactor	Compressor always runs.	• Compressor contactor has failed closed	Welded Contactor
		• Thermostat demand signal is not connected
		to module.
Low Voltage	Control circuit < 17VAC.	• Control circuit transformer is overloaded	Compressor Low Volt Trip
		• Low line voltage (contact utility if voltage
		at disconnect is low)
Protector Trip	Thermostat demand signal Y is	• Compressor protector is open.	Protector Trip
	present, but the compressor is	• Outdoor unit power disconnect is open.
	not running.
		• Compressor circuit breaker or fuse(s) is
		open.
		• Broken wire or connector is not making
		contact.
		• High pressure switch open if present in
		system.
		• Compressor contactor has failed open.
Table 6-6-Comfort Alert Outputs

The Comfort Alert diagnostic alarms are configurable in the E2 as Disabled, Failure, Alarm, or Notice with an accompanying priority setting. All Comfort Alert codes will share the same advisory type and priority parameters.

High/Low Occ/Unocc Space Temperature Alarms

The thermostat does not provide alarming information on either high or low temperatures for the Space tempera- ture sensor. Therefore, the E2 application will provide this functionality.

Supply Sensor Fail Alarm

The thermostat does not provide alarm information on a failure of the supply temperature probe (if installed). The E2 application will provide this functionality. Advisory type, priority, and delay is provided for the supply sensor fail advisory.

Conditions for Return to Normal (RTN) on Diag- nostic Codes

The E2 application will issue an RTN on an active advisory when the corresponding bit of the diagnostic code goes to zero. If multiple diagnostic advisories are active simultaneously, they will all return to normal when the code reads zero.

6.3.10Refrigerant Leak Detection System (RLDS)

The RLDS provides for the continuous monitoring of refrigerant gas levels in up to 16 separate test zones or channels. The instrument is programmed to monitor a variety of gases and independent leak (small), spill (medium), and evacuation (large) levels may be desig- nated for each zone. The instrument also retains a log of

previous readings that can be accessed for analysis.

Figure 6-9 - RLDS

The RLDS has alarm level configuration parameters that are synchronized. These will be read first from the device. The E2 will be master of all other parameters. An audible alarm and front panel indicators are provided to signal alarm and fault conditions, and relay contacts are provided that can be used to trigger external alarm devices in the event of a system fault, or if a leak (small), spill (medium), or evacuation (large) level of gas is detected. The system also may be fitted with an optional two-chan- nel 4-20mA current loop board for connection to remote monitoring equipment.

MODBUS The RS485 Network and Hardware Setup • 6-11