26 LonTalk Communication Interface • ACC-SVN100A-EN
Network Variable and Configuration Property Definitions
nviCapacityLim
Capacity limit setpoint, SNVT_lev_percent
• Default: Uses nciCapacityLim
• Invalid value: 0x7FFF = 163.835%
• Range: -163.84% to 163.83% (limited at chiller) or Invalid
This input network variable sets the maximum capacity level the chiller can use. This level
cannot be adjusted above the manufacturer-specified limit.
nviChillerEnable
Chiller enable/disable request, SNVT_switch
• Default: Uses nciChillerEnable
• Invalid value: 0xFF, 0xFF
This input variable provides the mechanism to enable (start) the chiller to run if operating
conditions are satisfied, or to disable (stop) the chiller from running.
nviCoolSetpt
Chilled water setpoint, SNVT_temp_p
• Default: Uses nciCoolSetpt
• Invalid value: 0x7FFF = 327.67°C
• Range: -273.17°C to 327.66°C (limited at chiller) or Invalid
This input variable provides the desired setpoint of the evaporator leaving water when
the chiller is operating in cooling mode. This will be ignored if the control is in heat mode.
The cooling mode is the normal mode of chiller operation, unless overridden to another
mode. Any setpoint value received will be clamped into a valid range by the chiller.
Valid range (uses 2-state definition of SNVT_switch)
Value
byte
State byte
Resulting
interpretation
Any 0 Disable (0)
0 1 Disable (0)
>0 1 Enable (1)
Any 0xFF Invalid
