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RTU Open 33
To wire a compressor safety input to the controller
NOTES
• An isolation relay may be required if the RTU Open is powered separately from the equipment's control
power circuit.
• Follow device manufacturer's installation and operating instructions.
Wiring an occupancy switch or door contact
Occupancy switch - field-supplied
Door contact - field-supplied
Occupancy or door contact switches may be installed to provide an alternate means of occupancy
determination or heating and cooling lockout. See Sequence of Operation (page 42) for additional details.
Wiring specifications
Cable from sensor to controller: If <100 ft (30.5 meters) 22 AWG, unshielded
If >100 ft (30.5 meters) 22 AWG, shielded
Maximum length: 500 feet (152 meters)