4
Marvair 8AA1024A-1060A & 8AA2036A-2060A I&O Manual
03/2021 Rev.1
Table of Contents
Chapter 5 Troubleshooting
5.1 Overview ................................................................................................................................................42
5.2 Failure Symptoms Guide ........................................................................................................................42
5.3 Compressor Troubleshooting .................................................................................................................43
5.4 Control Board Diagnosis ........................................................................................................................44
Chapter 6 Maintenance
6.1 Scheduled Maintenance .........................................................................................................................45
Chapter 7 Warranty
7.1 Airxcel Commercial Group Limited Product Warranty .........................................................................46
Chapter 8 Start-Up Checklist
8.1 Start-Up & Commissioning Form ..........................................................................................................47
Appendix A
Installation Instructions for Field Installed Electric Heaters ...........................................................................51
Illustrations
Figure 1a. Typical Electrical Schematic - Non-Economizer .......................................................................11
Figure 1b. Typical Electrical Schematic - w/Economizer ...........................................................................12
Figure 1c. Typical Electrical Schematic - w/Economizer (Alternate Construction) ..................................13
Figure 1d. Typical Electrical Schematic - w/Economizer (Alternate Construction) ..................................14
Figure 1e. Typical Electrical Schematic - w/Economizer (Alternate Construction) ..................................15
Figure 2.
Dry Bulb sensor ..........................................................................................................................17
Figure 3.
Enthalpy Sensor Temperature Control Points ............................................................................18
Figure 4.
Electrical Controls, Alternate Construction ...............................................................................18
Figure 5.
Economizer Control Board ........................................................................................................19
Figure 6a. Setting the Speed for the Y1 and Y2 Operation for Indoor Motor ............................................22
Figure 6b. Second Stage Cooling Speed .....................................................................................................22
Figure 7.
Output Termination for Indoor Motor Control Signal ...............................................................23
Figure 8.
Outdoor Motor Speed Setting ....................................................................................................23
Figure 9.
Output Termination for Outdoor Motor Control Signal .............................................................23
Figure 10. Communications SetUp .............................................................................................................24
Figure 11. Fresh Air Hood Damper, Models 1024A-1060A & 2036A-2060A ...........................................35
Figure 12. Wall Mounting Detail .................................................................................................................36
Figure 13a. Humidistat Wiring Details ..........................................................................................................39
Figure 13b. Thermostat Connection Diagram ...............................................................................................39
Figure 13c. CommStat™ 3 HVAC Controller Wiring Detail ........................................................................40
Tables
Table 1 CFM @ External Static Pressure .................................................................................................7
Table 2 Return Air Filter Sizes .................................................................................................................7
Table 3 Shipping Weights .........................................................................................................................7
Table 4 Ambient Temperature Operating Range ......................................................................................7
Table 5. MODBUS Network Address DIP Switch Positions ..................................................................25
Table 6a. MODBUS Discrete Registers ....................................................................................................29
Table 6b. MODBUS Registers...................................................................................................................30
Table 7 Minimum Clearances .................................................................................................................32
Table 8 Voltage Limitations ....................................................................................................................32
Table 9 Maximum Static Pressure ..........................................................................................................35
