What is a VMA in HVAC?

What is a VMA in HVAC?

Variable Air Volume Modular Assemblies (VMAs) Our VMAs feature a wide variety of network sensor options for measuring zone temperature, duct temperature, zone humidity, carbon dioxide levels and more.

What is a VMA controller?

The Variable Air Volume Modular Assembly (VMA) is a family of configurable digital controllers. Differing models in the VMA1400 series combine a controller, pressure sensor and/or actuator housed in one pre-assembled unit.

How do you use a Johnson Control thermostat?

Starts here9:50Johnson Controls Thermostat – How To Operate – YouTubeYouTube

How do VAV boxes work?

The VAV regulates the volume of the air to the zone by opening or closing the damper, thus controlling the amount of conditioned air directed to the zone. Each zone in a building has a thermostat that controls the VAV, telling it when to open or shut the damper based upon the needs of the zone.

How do you adjust a Johnson Control thermostat?

How do I jailbreak my Johnson Controls thermostat?

How to Unlock a Johnson Controls Thermostat

1. Press and hold the “C/F” button on the front of the thermostat until the configuration menu appears—roughly 8 seconds.
2. Tap “C/F” until “Lockout” appears on the screen.
3. Press the “Up” or “Down” buttons until “Lockout Level 0” appears on the screen.

Who makes VAV boxes?

The Johnson Controls single duct units along with all VAV family model types of Johnson Controls are manufactured and assembled with a patented multi-point, center-averaging, airflow sensor called the FlowStar sensor.

How many types of VAV are there?

There are two primary types of VAV systems—single-duct and dual-duct.

Do Vavs Have filters?

Each VAV terminal box is connected to a supply air source. This is a ducted connection that provides air from an AHU. Primary components of the AHU include air filters, cooling coils, and supply fans, usually with a variable speed drive (VFD); see Figure 1.

Why do thermostats hiss?

Pneumatic thermostats often hiss when they’re telling your AC or heating system to turn on or off. So, the frequent hissing noises coming from your thermostat are simply the metallic strips adjusting the air pressure inside those tubes.