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VersaPro
80% Gas Furnace
Service Manual
MODELS:
• MGA80EE040A3B
• MGA80EE060B4B
• MGA80EE080B4B
• MGA80EE080C4B
• MGA80EE100C5B
• MGA80EE120D5B
Read this manual carefully before installation and keep it where
the operator can easily find it for future reference.
Due to updates and constantly improving performance, the
information and instructions within this manual are subject to
change without notice.
Version Date: 05/23/24
Please visit www.mrcool.com/documentation
to ensure you have the latest version of this manual.
TM
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Summary of Contents for MrCool VersaPro MGA80EE040A3B
- Page 1 Due to updates and constantly improving performance, the information and instructions within this manual are subject to change without notice. Version Date: 05/23/24 Please visit www.mrcool.com/documentation to ensure you have the latest version of this manual.
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Page 2: Table Of Contents
2.1 Wiring Summary .............. 5 2.2 Dialing Instructions ............5 2.3 Main Control Board ............5 2.4 Fan Drive Board ............... 5 2.5 Fan Speed Dialing ............6 TROUBLESHOOTING ..............10 3.1 Common Failure Codes ..........10 3.2 Fault Code Procedures ..........11 mrcool.com... -
Page 3: Product Overview
1.3 Product Images MRCOOL Gas Furnace Airflow: M = Multi-Position (Upflow/Horizontal) D = Downflow A = All (Upflow/Horizontal/Downflow) -
Page 4: Exploded View Of The Unit
Smoke Exhaust Fan Volute Burner Gas Collection Hood Door Switch Heat Exchanger Tube Assembly Main Control Board Smoke Extraction Motor 24V Wired Remote Interface Wind Pressure Switch Internal Motor Wind Pressure Connection Pipe Counter Flow Thermostat Flame Sensor Transformer Fan Drive Module mrcool.com... -
Page 5: System Schematic Diagram
3.3.2 Gas Pipe Assemblies Deliver the gas and distribute it evenly to each copper nozzle; 3.3.3 Ignition Needle mrcool.com Provide a gas ignition heat source to ignite the gas; Silicon nitride material, 115V strong electricity, reach... -
Page 6: Individual Components & Roles
Provides air duct circulating air volume Counter-current Thermostats Prevent heat backflow when the fan fails, and protect and cut off the gas in time. Transformers Convert 115V strong current into 24V weak current, and supply the low-voltage control circuit of the control board. mrcool.com... - Page 7 The drive module of the internal fan is used in the internal motor model of the external drive, and the function is to control the operation logic of the internal fan (at this stage, the internal motor of the external drive is constant air volume control). mrcool.com...
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Page 8: Electrical & Wiring Overview
ELECTRICAL & WIRING OVERVIEW 2.1 Wiring Summary Gas Furnace Repair Manual 2. Dialing instructions 1) Main control board mrcool.com... - Page 9 DIP SW Nominal (Minutes) S1-1 S1-2 60A / 80B / OFF OFF *OFF RESERVE Cool Off Delay OFF ON RESERVE *OFF DIP SW Nominal RESERVE (Minutes) S2-3 S2-4 OFF OFF 2.3 Main Control Board B & C mrcool.com 2）Fan drive board...
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Page 10: Fan Drive Board
Machine Machine DIP SW Nominal Speed DIP SW Nominal Speed Windshield Windshield Setting S3-1 S3-2 S3-3 S3-4 Setting S3-1 S3-2 S3-3 S3-4 Heat Heat Cool Cool Heat Heat Cool Cool *OFF *OFF 100C / 120D 60A / 80B / mrcool.com... -
Page 11: Troubleshooting
The flame is low and the flame sensor induces a small Flame low current but still operates Fault The power supplies are polarized in reverse Power Reversed Fault The fuse is disconnected Fuse Open Fault The electronic control board fails Board Error Fault Incorrect signal combination Signal Error mrcool.com... -
Page 12: Fault Code Procedures
The E1 smoke exhaust fan detects a long closure of the wind pressure switch 1st-stage when it is off. Cause of Failure: 1. Incorrect wiring 2. The wind pressure switch is damaged 3. The electric control board itself is damaged Processing Flow: mrcool.com... - Page 13 3. The connection hose is damaged or not connected / the pressure measuring port of the smoke exhaust fan is blocked, and the pressure cannot be transmitted to the air pressure switch 4. The smoke pipe is blocked 5. The exhaust fan motor is damaged 6. The electric control board is damaged. Processing Flow: mrcool.com...
- Page 14 TROUBLESHOOTING Display Code: E5 thermostat switch open/flame spill E6 thermostat switch open/flame spillage lasts more than 5 minutes Cause of Failure: 1. Incorrect wiring 2. Thermostat is damaged Processing Flow: mrcool.com...
- Page 15 Adjust the gas valve spring so Check whether the that the pressure gas pressure is behind the valve normal see figure 2 meets the requirements of Table 1 Clean blockage or replace Replace Adjust air nozzle supply pressure mrcool.com...
- Page 16 Table 1 Inlet Gas Supply Pressure Natural Gas Minimum: 4.5" W.C. Maximum: 10.5" W.C. Propane Gas Minimum: 11" W.C. Maximum: 13.0" W.C. Table 2 Use a multi-meter to measure whether the ignition pin resistance is between 9-17 Ω Figure 5 mrcool.com...
- Page 17 TROUBLESHOOTING Use a multi-meter to measure whether there is 115V voltage Figure 6 mrcool.com...
- Page 18 VersaPro 80% Gas Furnace Service Manual The design and specifications of this product and/or manual are subject to change without prior notice. Consult with the sales agency or manufacturer for details.
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