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Marvair MGA3090-3180 Wall Mount AC I&O Manual 05/2023 Rev.14
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
configurable menu options for various operations and control. The Marvair PCB comes equipped with
seven segment display to annunciate faults, 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.
See I/O table
.
1
16
17
18
19
20
21
22
23
2
3
4
5
6
7
12
13
15
14
9
10
11
8
