Engineering Guide for Variable Air Volume Modular Assembly: Johnson Control VMA

Complete Engineering Guide for Variable Air Modular VMA-1200 & VMA-1400 Series. 

The only variable air system is a zone system in HVAC engineering system. This VMA or Variable Air Volume controls dampers to allow maximum to minimum airflow in any given branch air handling network.

When it closes, the air has to be dumped somewhere else to maintain the minimum airflow for the system.

So if you close one here you open one there, air just distributed in its different path. This is managed via a barometric damper that senses the pressure on the duct system and opens accordingly.

But the total air flow must remain constant through the evaporator coil.

They are not efficient from an energy standpoint because the extra air is dumped into an area not needing a controlled conditioning.

Sometimes it is even dumped outside if there is insufficient space for this purpose. You may read more details clicking link below:

Variable Air Volume Modular Assembly (VMA) 1200 Series Overview and Engineering Guidelines

The Variable Air Volume Modular Assembly (VMA) 1200 Series is a configurable, integrated module that includes a Variable Air Volume (VAV) controller, actuator, and differential pressure sensor. The VMA has two models: cooling only and cooling with reheat. The models, which use the LonTalk® protocol, are designed for pressure independent, single duct systems. The reheat model can be used with parallel or series fan powered boxes.

Download the full Using Variable Air Volume Modular Assembly (VMA)1200 Series Applications guide from the link below:

Variable Volume Modular 1200 series

Variable Air Volume Modular Assembly (VMA) 1400 Series

The Variable Air Volume Modular Assembly (VMA) 1400 Series is an integrated module that includes a controller, differential pressure sensor, and actuator (except VMA1430 models, which are intended to be used with an external actuator).

Download the full Using Variable Air Volume Modular Assembly (VMA)1400 Series Applications guide from the link below:

Variable Volume Modular 1400 series

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