
VAV-PRC011M-EN 95
DDC Controls
Table 48, p. 95 provides an input listing for Tracer VV550/551 VAV controllers, and Table 49, p. 95
provides an output listing for Tracer VV550/551 VAV controllers. Table 50, p. 96 provides the
configuration properties for the controller. The content of the lists conforms to both the LonMark
SCC functional profile 8500 and the LonMark node object.
Table 48. Input listing
Input description Input SNVT type
Space temperature nviSpaceTemp SNVT_temp_p
Setpoint nviSetpoint SNVT_temp_p
Occupancy, schedule nviOccSchedule SNVT_tod_event
Occupancy, manual command nviOccManCmd SNVT_occupancy
Occupancy sensor nviOccSensor SNVT_occupancy
Application mode nviApplicMode SNVT_hvac_mode
Heat/cool mode input nviHeatCool SNVT_hvac_mode
Fan speed command nviFanSpeedCmd SNVT_switch
Auxiliary heat enable nviAuxHeatEnable SNVT_switch
Valve override nviValveOverride SNVT_hvac_overid
Flow override nviFlowOverride SNVT_hvac_overid
Emergency override nviEmergOverride SNVT_hvac_emerg
Source temperature nviSourceTemp SNVT_temp_p
Space CO2 nviSpaceCO2 SNVT_ppm
Clear alarms/diagnostics nviRequest
(a)
SNVT_obj_request
Air flow setpoint input nviAirFlowSetpt SNVT_flow
(a) Part of the node object
Table 49. Output listing
Output description Output SNVT type
Space temperature nvoSpaceTemp SNVT_temp_p
Unit status, mode nvoUnitStatus SNVT_hvac_status
Effective setpoint nvoEffectSetpt SNVT_temp_p
Effective occupancy nvoEffectOccup SNVT_occupancy
Heat cool mode nvoHeatCool SNVT_hvac_mode
Setpoint nvoSetpoint SNVT_temp_p
Discharge air temperature nvoDischAirTemp SNVT_temp_p
Space CO2 nvoSpaceCO2 SNVT_ppm
Effective air flow setpoint nvoEffectFlowSP SNVT_flow
Air flow nvoAirFlow SNVT_flow
File table address nvoFileDirectory
(a)
SNVT_address
Object status nvoStatus
(a)
SNVT_obj_status
Alarm message nvoAlarmMessage SNVT_str_asc
(a) Part of the node object.
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