Honeywell HPFF12 - NAC Circuit Loop Wiring Requirements

52 HPFF12 NAC Expander — P/N 53576:B 11/24/2010
Power Supply Requirements NAC Circuit Loop Wiring Requirements
6.5 NAC Circuit Loop Wiring Requirements
Make sure these requirements are met:
1. For any NAC circuit with a full load (up to 3 Amps), the total wire resistance must be less than
or equal to 0.66 Ohms.
and
2. The NAC loop current draw multiplied by total wire resistance on any single NAC circuit
cannot exceed 2.0 volts.
NOTE: For loads smaller than 3 Amps, use the second calculation.