Remote Occupancy; Fire Shutdown; Compressor Safety; Fan Status - Carrier RTU Open v5 Integration Manual

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Remote Occupancy

Remote occupancy may be configured on any unused binary input channel. A typical application is a remote

contact, controlled by a third party, or an occupancy sensor to set the controller's occupied mode. The Remote

Occupancy function requires both an input configured for Remote Occupancy, and Occupancy Source set to

Remote Occ Input to operate.

Once configured, the controller will operate in the occupied or unoccupied mode, as determined by the state of

the Remote Occupancy input.

Fire Shutdown may be configured on Binary Input 5. A typical application involves a smoke detector or fire

shutdown contact, which, when active, immediately shuts down equipment operation.

Compressor Safety may be configured on Binary Input 3. A compressor safety tripped indicator circuit is available

on most Carrier rooftop equipment.

A Compressor Safety Alarm is shown on Properties page > Control Program tab > Alarms and indicates that the

equipment requires attention.

Cooling, heating, and supply fan outputs are not interrupted except where the RTU Open is configured for Heat

Pump operation. When configured for Heat Pump, and in the heating mode, a compressor safety fault will cause

the available stages of electric heating to be enabled in place of mechanical heating.

Normal operation resumes when the compressor safety circuit is de-energized.

Fan Status may be configured on any unused binary input channel. A typical application would be an airflow

switch, current sensing relay, or other device that provides a supply fan running verification.

Enabling this function displays the supply fan's status on the equipment graphic.

If the controller loses fan status during operation, heating and cooling are disabled, the economizer damper (if

available) is closed, and an alarm for loss of status is indicated.

If the fan status is on when the controller is commanding the fan off, the unit remains in the off state. An alarm is

generated indicating that the fan is running when it should be off.

RTU Open v5

Integration Guide

Sequence of Operation

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