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Marvair GAA A/C w/Gas Heat I&O Manual
06/2023 Rev.5
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
