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Sequence of Operation
Sequence of Operation
The RTU Open supports various types of constant volume 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 variable speed supply fan control.
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 in the i-Vu® application, networked through an i-Vu® Open Router
•
A BACnet or local schedule configured for subordinate VVT Zones, networked through an i-Vu® Open
Router(s) 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 v3
Installation and Start-up Guide
44
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