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AAON Manuals
Control Unit
MODGAS-X
Technical manual
AAON MODGAS-X Technical Manual
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Contents
Table of Contents
Troubleshooting
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Table of Contents
Table of Contents
Overview
General Information
Dimensions
Figure 1: MODGAS-X Module Dimensions
Wiring
Important Wiring Considerations
Table 1: Electrical and Environmental Requirements
Single Modulating Valve no Staging - Stand-Alone Wiring
Figure 2: Single Modulating Valve no Staging Stand-Alone Wiring Diagram
Single Modulating Valve no Staging - Communicating Wiring
Figure 3: Single Modulating Valve no Staging Communicating Wiring Diagram
Single Modulating Valve and up to 14 Stages of Fixed Heat Stand-Alone
Figure 4: Single Modulating Valve - Stand-Alone Wiring Diagram
Figure 5: Single Modulating Valve and 14 Stages of Fixed Heat - 12 Relay E-BUS Expansion Module
Two Modulating Valves and up to 13 Stages of Fixed Heat Stand-Alone
Figure 6: Two Modulating Valves - Stand-Alone
Figure 7: Two Modulating Valves and 13 Stages of Fixed Heat - 12 Relay E-BUS Expansion Module
Two Modulating Staged Valves - Stand-Alone Wiring
Figure 8: Two Modulating Staged Valves Stand-Alone Wiring Diagram
Two Modulating Staged Valves - Communicating Wiring
Figure 9: Two Modulating Staged Valves Communicating Wiring Diagram
Inputs and Outputs
Table 2: MODGAS-X Inputs and Outputs
Sequence of Operation
Operating Modes
Table 3: Heating Mode Voltage/Signal
Lcd Screens
Navigation Keys
Figure 10: LCD Display and Navigation Keys
Table 4: Navigation Key Functions
Table 5: Editing Key Functions
Main Screens Map
MODGAS-X Screens
Status and Alarms Screens
Setpoint and Force Screens
Protected and Diagnostic Screens
Configuration Screens
Troubleshooting
LED Diagnostics
Table 6: STATUS LED Blink Codes
Table 7: STATUS LED Blink Codes
Figure 11: MODGAS-X LED Locations and Descriptions
Alarms
SAT Sensor Testing
Table 8: 0-3V Temperature Sensor - Voltage and Resistance for Type III Sensors
Table 9: 0-5V Temperature Sensor - Voltage and Resistance for Type III Sensors
Appendix A: Sat Sensor
Installation
Figure 12: Supply Air Temperature Sensor Installation
SAT Sensor Wiring Guide and Jumper Settings
Table 10: SAT Wiring Conditions
Table 11: Stand-Alone Mode SAT OPTIONS Jumper Settings
Table 12: Communications Mode SAT OPTIONS
Jumper Settings
Appendix B: Modgas II Replacement
MODGAS-X Replacement of MODGAS II
Figure 13: MODGAS-X Module
Appendix C: Maxitrol ® Valves
MAXITROL ® Stepper Valve Types
Figure 14: Two-Wire 0-20 Volt Reverse-Acting MAXITROL ® Selectra Stepper Valve
Figure 15: Four-Wire 0-10 Volt Directing-Acting MAXITROL ® EXA STAR Stepper Valve
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Sequence of Operation
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Operating Modes
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MODGAS-X Module
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