Light Commercial HVAC

Monitor and Control Outdoor Air Intake Flow Rates

System Challenges:
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Wind pressure effect

Stack pressure effect

Fan speed variations (VAV and multispeed fan systems)

Filter loading

Equipment Challenges:
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Oversized dampers

Damper hysteresis and deterioration

Damper hysteresis and deterioration

YOUR Benefits:
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Compensate for system effects!

Detect operational problems and failures!

Improve thermal comfort and humidity control!

Save energy by not over-ventilating!

Improve indoor air quality by not under-ventilating!

Document ventilation compliance!

Light commercial HVAC systems account for more than 50% of today’s heating and ventilating needs. Although energy efficiency ratios have dramatically improved over the past several decades, outdoor air ventilation control has been mostly ignored.

Outdoor air is required by code, paramount to acceptable indoor air quality (IAQ) and a prerequisite for thermal comfort. Improperly controlled, these systems often provide unacceptable indoor air quality, waste energy and provide poor temperature/humidity control.

Traditional Methods

Traditional methods are ineffective in providing the outdoor air required for IAQ and pressurization, the latter which results in often misdiagnosed temperature and humidity control issues. Traditional methods can result in ventilation error in excess of 50%!

Rely on fixed damper position or fan speed to maintain outdoor airflow rates.

Vary outdoor airflow rates to maintain a maximum CO2 level.

Use the ratio of outdoor, return and mixed air temperatures to estimate outdoor airflow rates.

Packaged Unit Solutions

Ideal for ducted, hooded and louvered intakes up to 8 sq ft

OAC Series

Non-Economizer Systems
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Control is triggered by a thermostat or two-position actuator signal (replace two position actuator with proportional actuator)

Models available for proportional or MP-bus actuators

Available with integrated airflow probes or approved BACnet third-party airflow measurement devices

Supports approved BACnet CO2 sensors and occupancy counters and most analog CO2 sensors

Models available with built-in schedule capability

EMOAC Series

Economizer Systems
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Control is triggered by economizer controller (by others) actuator signal

Requires a proportional actuator

Available with integrated airflow probes or approved BACnet third-party airflow measurement devices

Supports approved BACnet CO2 sensors and occupancy counters

Supports most analog CO2 sensors if the economizer fault signal is not required

ERV/HRV Solutions

Ideal for duct and cabinet openings up to 8 sq ft

OAC, TRACK and OACTRACK Series

Intake and/or exhaust paths of ERV/HRV units
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Control can be triggered by an analog binary output or via MS/TP BACnet

Provide outdoor airflow control (OAC), exhaust fan tracking (TRACK) or both (OACTRACK

Available with integrated airflow probes or approved BACnet third-party airflow measurement devices

Supports approved BACnet CO2 sensors and occupancy counters and most analog CO2 sensors

Round Duct Solutions

Designed for 4 to 16 inch round

OAC Series:
_____

Intakes to Fan Coils

Factory assembled valve/ actuator option (shown) available

Control is typically triggered by a thermostat

Models available for proportional or MP-bus actuators

Available with integrated airflow probes or approved BACnet third-party airflow measurement devices

Supports approved BACnet CO2 sensors and occupancy counters and most analog CO2 sensors

Models available with built-in schedule capability

OAC Series
_____

DOAS/Makeup Air Units

Factory assembled valve/ actuator model (shown) available

Control can be triggered by an analog binary output or via MS/ TP BACnet

Models available for proportional or MP-bus actuators

Available with integrated airflow probes or approved BACnet third-party airflow measurement devices

Supports approved BACnet CO2 sensors and occupancy counters and most analog CO2 sensors

Supports approved BACnet CO2 sensors and occupancy counters and most analog CO2 sensors

Models available with built-in schedule capability

GreenTrol offers a wide range of airflow measurement devices and application specific airflow controllers. The Company also manufactures CO2 sensor systems and occupancy counters so it can offer a turn-key single source solution for today’s smaller HVAC systems.

GreenTrol Automation

156 Holly View Lane Loris, SC 29569 Toll Free 877 446 8765

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