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Marvair MAA/MGA Wall Mount AC Installation & Operation Manual
05/2023 Rev.21
Chapter 5 Troubleshooting
5.1 Overview ................................................................................................................................................45
5.2 Failure Symptoms Guide ........................................................................................................................45
5.3 Compressor Troubleshooting .................................................................................................................46
5.4 Control Board Diagnosis ........................................................................................................................47
Chapter 6 Maintenance
6.1 Scheduled Maintenance .........................................................................................................................48
Chapter 7 Warranty
7.1 Marvair Limited Product Warranty ........................................................................................................49
Chapter 8 Start-Up Checklist
8.1 Start-Up & Commissioning Form ..........................................................................................................50
Appendix A
Installation Instructions for Field Installed Electric Heaters ...........................................................................54
Illustrations
Figure 1a. Typical Electrical Schematic - Model MAA ..............................................................................12
Figure 1b. Typical Electrical Schematic - Model MAA with Economizer ..................................................13
Figure 1c. Typical Electrical Schematic - Model MAA (Alternate Construction with Economizer) ........14
Figure 1d. Typical Electrical Schematic - Model MAA (Alternate Construction with Economizer) .........15
Figure 1e. Typical Electrical Schematic - Model MAA (Alternate Construction with Economizer) .........16
Figure 2.
Enthalpy Sensor and Temperature Control Points .....................................................................27
Figure 3.
Dry Bulb sensor ..........................................................................................................................28
Figure 4.
Fresh Air Hood Damper, Models 1024A-1072A .......................................................................38
Figure 5.
Wall Mounting Detail .................................................................................................................39
Figure 6a. Humidistat Wiring Details to a Marvair Air Conditioner with Reheat ......................................42
Figure 6b. Thermostat Connection Diagram ...............................................................................................42
Figure 6c. CommStat™ 4 HVAC Controller Wiring Detail ........................................................................42
Tables
Table 1 CFM @ External Static Pressure .................................................................................................7
Table 2 Return Air Filter Sizes .................................................................................................................7
Table 3 Installed Unit Weights ..................................................................................................................7
Table 4 Ambient Temperature Operating Range ......................................................................................7
Table 5 Refrigerant Charge .......................................................................................................................8
Table 6. Modbus Network Address DIP Switch Positions ......................................................................26
Table 7 Minimum Clearances .................................................................................................................35
Table 8 Voltage Limitations ....................................................................................................................35
Table 9 Maximum Static Pressure ..........................................................................................................38