The EMOAC-4000 modulates the control signal to a proportional analog outdoor/return air damper actuator to maintain the minimum ventilation rate required whenever the economizer controller (by others) is in minimum outdoor air mode. The controller can be configured to maintain an unoccupied outdoor airflow setpoint to provide unoccupied pressurization. DCV requires approved BACnet MS/TP CO2 sensors or occupancy counters. The EMOAC-4000 does not support economizer controllers that require an actuator feedback signal (see the EMOAC-5000).
ECONOMIZER MOA CONTROLLERS
Controller Modules for Systems with an Airside Economizer
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
Detect economizer and system faults
Compatible with GreenTrol IAT integrated thermal dispersion airflow/temperature sensors or approved BACnet MS/TP airflow measuring devices
Provide airflow setpoint control, CO2-DCV or population based-DCV during MOA 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
The EMOAC-4000 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 EMOAC-4000 interfaces with approved MS/TP BACnet CO2 sensors and occupancy counters when DCV is required. An actuator fault/feedback signal cannot be provided.
The EMOAC-4000 modulates the control signal to a proportional analog outdoor/return air damper actuator to maintain the minimum ventilation rate required whenever the economizer controller (by others) is in minimum outdoor air mode. The controller can be configured to maintain an unoccupied outdoor airflow setpoint to provide unoccupied pressurization.
Advanced logic and airflow measurement improves traditional CO2-DCV when demand control ventilation is required. The EMOAC-4000 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 EMOAC-4000 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.
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)
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: Not supported
“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
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
General Purpose Inputs
Type: Analog Input (AI1)
Assignment: Economizer controller actuator output signal
Configurable Ranges: 0-5V, 0-10V, 2-10V, or 4-20mA
Assignment: Economizer actuator 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
Contact Closure Relay
Type: Dry contact w/ onboard jumper to drive a remote LED
Assignment: EMOAC alarms or Control Mode
Status: Normally Open (N.O.)
Rating: 30 VDC or 24 VAC @ 3 amp. max.
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
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]
156 Holly View Lane Loris, SC 29569 Toll Free 877 446 8765