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Metasys® Controllers

MS-VMA18 N2 Controllers for VMA14xx Retrofit

Variable Air Volume Controller

VMAs are programmable digital controllers tailored for VAV applications that communicate via the N2 protocol, which can be integrated to any supervisory controller capable of managing N2 Open networks and devices, such as the Network Communication Module (NCM) and Network Automation Engine (NAE).


  • 32-bit microprocessor ensures optimum performance and meets industry specifications.
  • Universal inputs, configurable outputs and Point Expansion modules. Allow multiple signal options to provide input/output flexibility.
  • Standard hardware and software platform.
  • Auto Tuned Control Loops.
  • A state-of-the-art digital non-flow pressure sensor to provide 14-bit resolution with bidirectional flow operation that supports automatic correction for polarity on high- and low-pressure DP tube connections; this pressure sensor eliminates high- and low-pressure connection mistakes.
  • A fast response actuator that drives the damper from full open to full closed (90°) in 60 seconds to reduce commissioning time.
  • Use for VMA14xx retrofits. Includes cable adapters for use when replacing VMA14xx Series controllers.
  • N2 Open Communications Protocol - N2 Protocol can be converted to BACnet Master-Slave/Token-Passing MS/TP protocol with a software download. This functionality provides a differentiated and cost-effective platform upgrade path for existing VMA customers who are looking for a gradual upgrade strategy