Model EMOAC-4000

ECONOMIZER MOA CONTROLLER

EMOAC Series

EMOAC-4000

Economizer Minimum Outdoor Airflow Controller Module for Economizer Controllers with Analog Proportional Actuators

Controller Modules for Systems with an Airside Economizer

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).

  • 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
  • Detect economizer and system faults
Overview PDF

Description

FEATURES

  • 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

OVERVIEW

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.

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)

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

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


GENERAL PURPOSE INPUTS

GP1

Type: Analog Input (AI1)

Assignment: Economizer controller actuator output signal

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

CONTACT CLOSURE RELAY

R1

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.


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

Type
Title
Brochures
Operation
Product Catalog
Series-Overview
Users Manual
Wiring