Description
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 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-3000 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-3000 interfaces with approved MS/TP BACnet CO2 sensors and occupancy counters when DCV is required.
The OAC-3000 modulates a network MP-bus actuator 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 an MP-bus actuator).
Advanced logic and airflow measurement improves traditional CO2-DCV when demand control ventilation is required. The OAC-3000 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-3000 controller 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 CO2 sensor)
CO2/OAF: Maintains a calculated outdoor airflow setpoint based on the estimated ventilation zone population (requires a CO2 sensor)
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
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 Probe: 1 probe x 1 or 2 sensor nodes/probe
Available Configurations: IAT-UI and IAT-US Probes
Single Probe:Dual Probe: 1 probes x 1 sensor node/probe
Dual Probe: 2 probes x 1 sensor node/probe
BINARY INPUT
BI
Type: Binary Input (BI1)
Assignment: Mode activation trigger signal
Configurable Ranges: 0-24VAC or 0-24VDC
Trigger Threshold
VAC configuration: 6.5 VAC
VAC configuration: 8 VDC
MP-BUS CONNECTION
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 CONNECTIONS
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:
