Marvair MAA/MGA Wall Mount AC Installation & Operation Manual
09/2021 Rev.15
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Chapter 2 Electronic Control Board
2.1 Introduction
WARNING
Failure to observe the instructions contained in this document may result in personal
injury and/or property damage and may void the warranty. Read this manual before
installing, replacing or using this product.
Marvair’s proprietary Printed Circuit Board (PCB) sets the standard for the industry in flexibility,
reliability and performance. This UL certified component is engineered to optimize Heating, Cooling
and Dehumidification operation while communicating valuable information to the end user. Special
features include 2-Stage operation with varying speed control to optimize latent and sensible capacity,
built in remote communication (MODBUS) for monitoring and/or control, optimized head pressure
control and the ability to function autonomously without the need for an off the shelf thermostat. The
Marvair PCB comes equipped with LEDs to monitor lockouts for independent circuits, which drastically
reduces troubleshooting time and system downtime. Lockout contacts are also provided along with the
alarms being transferred via MODBUS.
This chapter provides the necessary information for installing and operating the Marvair PCB.
The diagram below identifies the inputs, outputs and connections for the Marvair PCB.
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