RTAC-SVX002A-EN 55
V-Operating Principles
Tab. V-01 – LonTalk Points List
LonTalk Communications Interface
Inputs Variable type SNVT_Type
Chiller Enable/Disable binary start(1)/stop(0) SNVT_switch
Chilled Water Setpoint analog temperature SNVT_temp_p
Current Limit Setpoint analog % current SNVT_lev_percent
Chiller Mode Note 1 SNVT_hvac_mode
Outputs Variable type SNVT_Type
Outputs Variable type SNVT_Type
Chiller On/Off binary on(1)/off(0) SNVT_switch
Active Chilled Water Setpoint analog temperature SNVT_temp_p
Percent RLA analog % current SNVT_lev_percent
Active Current Limit Setpoint analog % current SNVT_lev_percent
Leaving Chilled Water Temperature analog temperature SNVT_temp_p
Entering Chilled Water Temperature analog temperature SNVT_temp_p
Entering Condenser Water Temperature analog temperature SNVT_temp_p
Leaving Condenser Water Temperature analog temperature SNVT_temp_p
Alarm Description Note 2 SNVT_str_asc
Chiller Status Note 3 SNVT_chlr_status
Note 1: Chiller Mode is used to place the chiller into an alternate mode; Cool
or Ice Build
Note 2: Alarm Description denotes alarm severity and target. Severity: no
alarm, warning, normal shutdown, immediate shutdown Target: Chiller,
Platform, Ice Building (Chiller is refrigerant circuit and Platform is control
circuit)
Note 3: Chiller Status describes Chiller Run Mode and Chiller Operating
Mode. Run Modes: Off, Starting, Running, Shutting Down Operating Modes:
Cool, Ice Build States: Alarm, Run Enabled, Local Control, Limited, CHW
Flow, Cond Flow
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