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Marvair MGA1072A - User Manual

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MODELS:
MAA1018A-MAA1060A, MGA1072A
(Single Stage)
MAA2060A-MGA2072A
(2-Stage)
Installation & Operation Manual
11 EER Vertical Wall-Mount Air Conditioners
Manufactured By:
A Division of the AIRXCEL
®
Commercial Group
P.O. Box 400 • Cordele, Georgia 31010 • 156 Seedling Drive • Cordele, Georgia 31015
(229) 273-3636 • Fax (229) 273-5154
E-mail: marvairsales@airxcel.com • Internet: www.Marvair.com
The most current version of this manual can be found at www.Marvair.com.
IMPORTANT
This manual may include information for options and features which may not be
included on the unit being installed. Refer to the unit data label or Model Identication
to determine which features and options this unit is equipped with.
INSTALLER: Afx the instructions on the inside of the building adjacent to the thermostat.
END USER: Retain this manual for future reference.
Marvair MAA/MGA Wall Mount AC Installation & Operation Manual
02/2021 Rev.13
Air Conditioner Product Manual
Vertical Wall-Mount Air Conditioners
with Front Control Box Panel

Table of Contents

Questions and Answers

  • D
    Diane LopezAug 17, 2025
    Why my Marvair MGA1072A Air Conditioner unit does not run?
    • K
      Kenneth SchneiderAug 17, 2025
      If your Marvair Air Conditioner unit isn't running, it could be due to a power supply issue. Check the power supply to ensure it has the correct phase and voltage. Inspect the wiring to the unit and check any external breakers or fuses. Also, the internal disconnect might have tripped, so check the internal circuit protection devices for continuity. An external thermostat could be causing the issue, so verify its operation. The unit might be off due to a high or low pressure limit; if so, reset the pressure switch. Finally, there could be an internal component failure or loose wiring, so check for these issues.
  • T
    Thomas JohnsonAug 19, 2025
    What to do if Marvair MGA1072A Air Conditioner runs continuously but cooling is insufficient?
    • W
      wallacemarkSep 12, 2025
      If your Marvair Air Conditioner runs for extended periods but doesn't cool sufficiently, start by checking the air filter(s) for dirt and ensure proper blower operation. Remove any airflow restrictions. The unit might have low refrigerant, so check for proper charge and potential leaks. A component failure, especially the compressor, could also be the cause, so inspect internal components. Finally, the unit might be undersized for the job, in which case you may need to add additional units for greater capacity.
  • C
    Christopher StoneAug 22, 2025
    Why does my Marvair MGA1072A cycle on high/low pressure limit?
    • M
      Matthew GonzalesAug 22, 2025
      If your Marvair Air Conditioner is cycling on high or low pressure limits, it could be due to a loss or restriction of airflow. Check the blower assembly for proper operation and look for airflow restrictions, such as a dirty air filter. Inspect the blower motor and condenser fan. Another cause could be a restriction in the refrigerant circuit, so check for blockages, especially in the filter drier and capillary tube assembly. If the unit was recently serviced, refrigerant overcharge could be the problem; in this case, evacuate and recharge to factory specifications. Lastly, a defective pressure control could be the issue; check the limit cutout pressures, noting that the control should actuate at approximately 60 PSIG (low pressure) and 650 PSIG (high pressure).
  • M
    Makayla CisnerosAug 25, 2025
    What to do if my Marvair MGA1072A Air Conditioner blows fuses or trips circuit breaker?
    • R
      Robert MorrisonAug 26, 2025
      If your Marvair Air Conditioner blows fuses or trips the circuit breaker, it may be due to inadequate circuit ampacity. Check the electrical requirements and correct as necessary. A short, loose, or improper connection in the field wiring could also be the cause, so inspect the field wiring for errors. An internal short circuit or loose connection within the unit could be the problem; check the wiring inside the unit, referring to the wiring and schematic diagrams, and test components, especially the compressor, for shorts. Excessively high or low supply voltage or phase loss (3ø only) could also cause this issue; note the voltage range limitations specific to the compressor troubleshooting section.
  • M
    Michael TurnerAug 27, 2025
    Why is there water on floor near my Marvair MGA1072A Air Conditioner?
    • G
      garrisonjoanAug 27, 2025
      If you find water on the floor near your Marvair Air Conditioner, it could be due to an obstruction in the condensate line. Check for any clogs or restrictions. Alternatively, there might be an obstruction or leak in the condensate pan, so inspect the pan for leaks or blockages. Finally, ensure the unit is level, as being unlevel can also cause water leakage.
  • D
    David ReillyAug 30, 2025
    How to troubleshoot no space heating or reduced heating in Marvair MGA1072A?
    • R
      Ryan MaynardAug 30, 2025
      If your Marvair Air Conditioner (equipped with resistance elements) provides no or reduced space heating, it could be due to defective heating element(s). Check the resistance element(s) for continuity. A thermal limit might be open, so check continuity across the thermal limit switch. A defective heater contactor could also be the cause, so check the relay for proper operation and replace it if defective.
  • L
    Lisa HallSep 2, 2025
    Why does my Marvair Air Conditioner blow fuses or trip the circuit breaker?
    • D
      Daniel JohnsonSep 2, 2025
      Your Marvair Air Conditioner might be blowing fuses or tripping the circuit breaker due to several reasons: * Inadequate circuit ampacity: Refer to electrical requirements and correct as necessary. * Short, loose, or improper connection in field wiring: Check field wiring for errors. * Internal short circuit, loose or improper connection(s) in unit: Check wiring in the unit, see wiring and schematic diagrams, and test components (especially the compressor) for shorts. * Excessively high or low supply voltage or phase loss: Note voltage range limitations specific to the compressor troubleshooting section.
  • K
    Kevin RiceSep 4, 2025
    Why is my Marvair Air Conditioner running continuously but cooling is insufficient?
    • A
      Alexis GrahamSep 4, 2025
      There are several reasons why your Marvair Air Conditioner might be running for long periods or continuously while providing insufficient cooling: * Dirty filter or reduced airflow: Check air filters and blower operation. Remove any airflow restrictions. * Low refrigerant: Check for proper refrigerant charge and possible leaks. * Component failure: Inspect internal components, especially the compressor, for proper operation. * Unit undersized for the job: Consider adding additional units for greater capacity.
  • T
    Troy ScottSep 7, 2025
    What to do if there is water on the floor near my Marvair Air Conditioner?
    • T
      Tara LeeSep 7, 2025
      If you find water on the floor near your Marvair Air Conditioner, here's what you should check: * Obstruction in condensate line: Look for any clogs or restrictions. * Obstruction or leak in condensate pan: Inspect the pan for leaks or blockages. * Unit is not level: Ensure the unit is properly leveled.
  • C
    Chelsea TateSep 10, 2025
    What to do if my Marvair Air Conditioner unit cycles on high or low pressure limit?
    • L
      Lisa RosalesSep 12, 2025
      If your Marvair Air Conditioner cycles on high/low pressure limit, consider the following: * Loss or restriction of airflow: Check the blower assembly for proper operation and look for airflow restrictions, such as a dirty air filter. Also, check the blower motor and condenser fan. * Restriction in refrigerant circuit: Check for blockages or restrictions, especially in the filter drier and capillary tube assembly. * Refrigerant overcharge: Evacuate and recharge the system to factory specifications. * Defective pressure control: Check the limit cutout pressures. The control should actuate at approximately 60 PSIG (low pressure) and 650 PSIG (high pressure).

Summary

How To Use This Manual

Important Safety Precautions

Key safety guidelines before operating or servicing the unit.

Chapter 2 Electronic Control Board

Sequence of Operation

Chapter 3 Installation

Equipment Inspection

Instructions for inspecting units for shipping damage and component parts.

Installation Requirements

Covers general requirements, noise, drainage, placement, and airflow for unit installation.

Porting and Duct Work

Electrical Connections

Covers high voltage wiring, dual unit phasing, and low voltage thermostat wiring.

Chapter 4 Start-Up

Check-Out of Cooling Cycle

Procedure for verifying proper operation of the cooling cycle.

Check-Out of Heating Cycle

Procedure for verifying proper operation of the heating cycle.

Chapter 5 Troubleshooting

Failure Symptoms Guide

Lists common problems, likely causes, and corrections for unit operation.

Compressor Troubleshooting

Provides electrical tests for diagnosing compressor issues.

Control Board Diagnosis

Explains how to diagnose faults using the control board's LED indicators.

Chapter 6 Maintenance

Scheduled Maintenance

Chapter 8 Start-Up Check List

Start-Up & Commissioning Form

APPENDIX A: Installation Instructions for Field Installed Electric Heat

Marvair MGA1072A Specifications

General IconGeneral
ModelMGA1072A
TypeAir Conditioner
Voltage208/230V
Phase3
RefrigerantR-410A
Compressor TypeScroll
EER11.0
Power Supply60 Hz
Cooling Capacity72, 000 BTU/h

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