Troubleshooting Guide for MRCOOL Versa Pro and Central Ducted Hyper Heat: Bypassing the Two-Wire Setup for 24V Operation

If you're troubleshooting the MRCOOL Versa Pro and Central Ducted Hyper Heat system and need to bypass the two-wire setup in favor of a 24V configuration, follow these steps carefully. This guide will walk you through the process of rewiring both the air handler and condenser, making jumpers, and adjusting dip switches for proper operation.

Step 1: Power Off the System

Before starting any work, turn off the breakers to both the air handler and condenser to ensure safety.

Step 2: Rewiring the Condenser

1. Go to the condenser unit.
2. Move the Red Wire: Take the wire off the "S1" terminal and move it to the "R" terminal.
3. Move the White Wire: Take the wire off the "S2" terminal and move it to the "C" terminal.
4. Create a Jumper: Make a jumper wire from "R" to "Y2" on the condenser.
5. Adjust Dip Switches: Turn dip switch 2 to the ON position.

Step 3: Rewiring the Air Handler

1. Go to the air handler unit.
2. Move the Red Wire: Take the wire off the "S1" terminal and move it to the "R" terminal.
3. Move the White Wire: Take the wire off the "S2" terminal and move it to the "C" terminal.
4. Create a Jumper: Make a jumper wire from "R" to "G" on the air handler.
5. Adjust Dip Switches: Locate the first set of four dip switches next to the display readout. Turn SW1-1 and SW1-4 to the ON position.

Step 4: Disconnect the HA/HB Wires

Remove the HA/HB wire from the air handler.

Step 5: Power On the System

Turn the breakers back on. The system will have a time delay of 3 to 7 minutes before it starts running. Be patient and allow this time for the system to reset.

Step 6: Testing the System

If the system does not turn on after the delay, use a voltmeter to check for proper voltage at the condenser:

1. Set the voltmeter to AC voltage mode.
2. Check R-C Voltage: Record the voltage readings between the "R" and "C" terminals.
3. Check Y2-C Voltage: Record the voltage readings between the "Y2" and "C" terminals.

Conclusion

By following these steps, you can successfully bypass the two-wire setup on the MRCOOL Versa Pro and Central Ducted Hyper Heat system and convert it to a 24V configuration. If the system doesn't start after 3-7 minutes, checking the voltage at the condenser will help pinpoint any remaining issues. Always ensure the system is properly powered down before making adjustments to avoid damage or injury.