Sequence Of Operation; Occupancy - Carrier RTU Open v5 Integration Manual

Sequence of Operation

Sequence of Operation
The RTU Open supports various types of constant volume and Staged Air Volume (SAV) air source configurations:

Standard heat/cool unit types with up to 2-stages of mechanical cooling and gas or electric heating

Heat pump units utilizing a reversing valve output for heating and cooling control

Heat pump unit (Carrier) with an OEM defrost control board

Economizer, CO2, Demand Limiting, and RH control strategies are available for appropriately equipped units

LC WeatherExpert™ unit with 3-stage compressor control and SAV variable speed supply fan control

SAV energy saving operation which utilizes a standard heat/cool rooftop unit with a fan equipped with a VFD
that provides variable speed fan control in both heating and cooling modes. This operation provides variable
air flow but not VAV operation and does not provide duct static pressure control. It must be used with
standard constant volume duct systems or VVT.
The RTU Open may operate as part of a VVT system using Airside Linkage or as a stand-alone controller.

Occupancy

The RTU Open's operation depends upon its occupancy state (Occupied/Unoccupied). The RTU Open operates
continuously in the Occupied mode until you configure an occupancy schedule.
An occupancy schedule may be:

A local schedule configured in the controller using an Equipment Touch or Field Assistant

A BACnet schedule configured for the RTU Open in the i-Vu® application.

A BACnet or local schedule configured in the VVT Zones that are subordinate to the RTU Open and employing
Linkage
To set up occupancy schedules, see the documentation for your user interface.
NOTE A BACnet schedule, downloaded from the i-Vu® application will overwrite a local schedule that was set up
with an Equipment Touch or Field Assistant.
Occupancy Source - the following settings determine occupancy.
Options:

Always Occupied – (default) Controller operates continuously, regardless of any configured schedule

BACnet Schedule – Uses a local BACnet occupancy schedule configured within the controller

BAS On/Off – Occupancy is set over the network by another device or a third party BAS. Refer to the RTU
Open Integration Guide for additional instructions in communication protocols.

Remote Occ Input – Controller monitors an input contact connected to one of the available binary inputs
configured to receive it. You must set Unit Configuration > Occupancy Source to Remote Occ Input and one
Input Switch Configuration to Remote Occupancy.
RTU Open v5
Integration Guide
20
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