OUTDOOR AIRFLOW CONTROLLERS

OAC Series
OAC-5000
Outdoor Airflow Controller Modules for Systems without an Airside Economizer
EMOA-or-MOA-5000-Transmitter-Angle

OUTDOOR AIRFLOW CONTROLLERS

OAC Series
OAC-5000
Outdoor Airflow Controller Modules for Systems without an Airside Economizer

The OAC-5000 has an additional analog input and analog output compared to the OAC-4000.  As a result, the OAC-5000 can be used with analog CO2 sensors as well as approved BACnet  MS/TP CO2 or occupancy counters.  It also provides an airflow output signal, if desired.

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

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

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

Clamp DCV airflow rates between minimum and maximum airflow limits

Analog airflow output signal

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-5000 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-5000 interfaces with analog or approved MS/TP BACnet CO2 sensors and occupancy counters when DCV is required. An analog airflow output signal is also provided.

The OAC-5000 modulates a proportional damper actuator or variable speed fan (VFD or ECM with analog speed control input) to maintain the outdoor airflow rate when an external binary trigger is active (i.e. 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 a proportional actuator).

Advanced logic and airflow measurement improves traditional CO2-DCV when demand control ventilation is required. The OAC-5000 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-5000 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

Minimum Outdoor Air Control (MOAC) 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)

PASS: Passes the economizer controller output signal (no control)

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

Economizer Controller Fault Signal Output: Yes (ECO FAULT=ON)

Note: If an economizer controller fault signal is required, an actuator feedback signal must be connected to AI2 and an analog input for a CO2 sensor is not available. Use an approved BACnet MS/TP sensor if CO2 measurement is required

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

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 IFT 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: 2 probes x 1 sensor node/probe

Dual Probe: 2 probes x 1 sensor node/probe

General Purpose Inputs

GP1

Type: Binary Input (BI1)

Assignment: Mode activation trigger signal

Configurable Ranges: 0-24VAC or 0-24VDC

GP2

Type: Analog Input (AI1)

Assignment (AI1): Analog output CO2 sensor

Configurable Ranges: 0-5V, 0-10V, 2-10V, or 4-20mA

Network Connection

AO1

Assignment: Airflow control signal

Configurable Ranges: 0-5V, 0-10V, 2-10V, or 4-20mA

Maximum Number of Actuators Supported:

0-5V, 0-10V or 2-10 V: Unlimited

4-20mA: 2

AO2

Assignment:  Airflow output signal

Configurable Ranges: 0-5V, 0-10V, or 2-10V, 

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 counter sensor

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: 4.72H x 7.29W x 1.36D in. [119.9 x 185.2 x 34.5 mm]

Related Documents

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