OUTDOOR AIRFLOW CONTROLLERS

OAC Series
OAC-3000S
Modules for Systems without an Airside Economizer
EMOA-or-MOA-3000-Transmitter-Angle

OUTDOOR AIRFLOW CONTROLLERS

OAC Series
OAC-3000S
Modules for Systems without an Airside Economizer

The OAC-3000S is a modified version of the OAC-3000. The controller has a built-in real time clock (RTC) that allows a daily or weekend/weekday occupied unoccupied schedule to override or operate in the absence of the binary input.

Compensate for damper hysteresis, filter loading, wind, stack and fan speed variations

Provide continuous verification of intake flow rates

Demonstrate compliance with ASHRAE Standards 62.1, 90.1 and 189.1

Satisfy LEED prerequisites and document code compliance

Improve indoor air quality and thermal comfort

Save energy

Features

Compatible with GreenTrol IAT integrated thermal dispersion airflow/temperature sensors or approved BACnet MS/TP airflow measuring devices

24 VAC/DC or MS/TP BACnet binary input activates occupied mode operation

RTC occupied/unoccupied scheduler

Provide airflow setpoint control, CO2-DCV or population based-DCV during occupied mode

Accepts approved BACnet MS/TP CO2 sensors or occupancy counters when DCV is required

Clamp DCV airflow rates between minimum and maximum airflow limits

Supports unoccupied airflow setpoint control

Built-in notification alarms

Contact closure relay can be assigned to notification alarms or active control mode

MS/TP BACnet connection

Overview

The OAC-3000S can be provided with a single integrated IAT-DI duct probe, one or two integrated IAT-UI or IAT-US universal mount probes or an approved external BACnet MS/TP airflow measurement device.

The OAC-3000S interfaces with approved MS/TP BACnet CO2 sensors and occupancy counters when DCV is required.

The OAC-3000S modulates an MP-Bus damper actuator to maintain the outdoor airflow rate. The controller can be configured to operate solely on the schedule or use the schedule with the binary input trigger to activate occupied mode.  The binary trigger is typically is provided by a thermostat or other analog or MS/TP BACnet binary output.  The trigger can also be provided by the 24 VAC control signal used when a two-position actuator is provided for outdoor air control (replace the two-position actuator with an MP-bus actuator).

Advanced logic and airflow measurement improves traditional CO2-DCV when demand control ventilation is required.  The OAC-3000S controller resets the outdoor airflow setpoint between user defined minimum and maximum airflow limits to maintain either a user defined fixed CO2 level or variable airflow setpoint based on the population using a built-in CO2/airflow counting algorithm or external occupancy counter.

The OAC-3000S interfaces with most MS/TP BACnet building automation systems and supports full read/write privileges as a BACnet 1/8 load master.  An RS-485 signal isolator is available when an isolated MS/TP network is required.

Functionality

Outdoor Air Control (OAC) Modes Supported

FLOW: Maintains a user defined airflow setpoint

CO2: Maintains a user defined CO2 level by resetting the outdoor airflow setpoint (requires a COsensor)

CO2/OAF: Maintains a calculated outdoor airflow setpoint based on the estimated ventilation zone population (requires a COsensor)

COUNT: Maintains a calculated outdoor airflow setpoint based on the occupancy counter population (requires an occupancy counter)

FIXED: Maintains a fixed damper position (no control)

Unoccupied Air Control (UAC) Mode Option: Yes, maintains a user defined airflow setpoint

Notification Alarms

“Unoccupied Mode” High/Low Airflow Alarm

“Minimum Outdoor Airflow Mode” High/Low Airflow Alarm

“All Modes” CO2 Alarm (requires a CO2 sensor)

“All Modes” System Trouble Alarm

Note: Alarms can be assigned to the contact closure relay

Built-in RTC Scheduler Modes:

Off: No schedule set

Days: Allows s different occupied start time and duration for each day of the week

weeks: Allows a different occupied start time and duration for weekdays and weekends

User Interface

Display: 16-character alpha-numeric LCD

Navigation: 4-button interface

Integrated Sensor Capability

Type: Accepts GreenTrol IAT-DI, IAT-UI and IAT-US Thermal Dispersion Airflow and Temperature Measurement Probe (required unless an external MS/TP airflow measurement device is provided). See appropriate IAT product data sheet for probe information..

Available Configurations:IAT-DI Probes

Single Probe1 probe x 1 or 2 sensor nodes/probe

Available Configurations: IAT-UI and IAT-US Probes

Single Probe:Dual Probe: 1 probes x 2 sensor node/probe

Dual Probe: 2 probes x 1 sensor node/probe

Binary Input

Binary Input

BI

TypeBinary Input (BI1)

AssignmentMode activation trigger signal

Configurable Ranges0-24VAC or 0-24VDC

Trigger Threshold

VAC configuration: 6.5 VAC

VAC configuration: 8 VDC

MP-Bus Output

MP1

Assignment: MP-Bus proportional actuator network signal (requires MP-bus cable, sold separately)

Contact Closure Relay

R1

Type: Dry contact w/ onboard jumper to drive a remote LED

Assignment: OAC alarms or Control Mode

Status: Normally Open (N.O.)

Rating: 30 VDC or 24 VAC @ 3 amp. max.

Network Connection

N1

Type: Non-isolated MS/TP BACnet master connection (provide an RS-485 network isolator if isolation is required)

B.A.S. Object Read/Write Access: Yes

Device Load: 1/8 load

Supported Baud Rates: 9.6, 19.2, 38.4 and 76.8 kbaud

MS/TP BACnet Airflow Sensor Capability:  One GreenTrol Automation or approved third-party airflow measurement device (cannot be used if an integrated airflow measurement device is connected).

MS/TP BACnet CO2 Sensor Capability: One GreenTrol Automation or approved third-party space mounted or return air CO2 sensor

MS/TP BACnet Occupancy Counter Capability: One to four GreenTrol Automation or approved third-party occupancy counterssensor

Environmental Limits, Power Requirements & Dimensions

Environmental Limits

Temperature: -20 to 120 ⁰F [-28.9 to 48.9 ⁰C]

Humidity: 5 to 95%

Important: Provide a weather-proof enclosure if the controller module is mounted outdoors

Power Requirement: 24 VAC (22.8 to 26.4 under load) @8.5V-A

Dimensions: 4.34H x 6.59W x 1.83D in. [110.2 x 167.3 x 46.6 mm]

Related Documents

GreenTrol Automation

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