Question

Hello - I’m trying to replace a single capacitor with a dual capacitor to fix my broken HVAC unit. The new capacitor has exactly the same specs but has 3 terminals instead of 2. How do you wire the terminals in this case? Any help appreciated.

Answer 1

When replacing a single capacitor with a dual capacitor in your HVAC unit, it's important to wire the terminals correctly to ensure proper functionality and prevent any damage. The additional terminal on the dual capacitor is typically used for an additional fan motor or compressor.

To wire the terminals correctly, you'll need to identify the different terminals on the dual capacitor and connect the corresponding wires from your HVAC unit.

1. Start by locating the terminals on the dual capacitor. There should be three terminals labeled C, FAN, and HERM.

2. Identify the wires coming from your HVAC unit. The common (C) wire is usually connected to the common terminal on both the old and new capacitors. This wire is typically labeled "C" or "COM" and is often connected to the fan motor.

3. The remaining two wires from your HVAC unit are usually connected to the hermetic compressor (HERM) and the condenser fan motor (FAN) terminals on the old capacitor.

4. Connect the common wire from your HVAC unit to the C terminal on the dual capacitor.

5. Connect the wire that was originally connected to the compressor terminal on the old capacitor to the HERM terminal on the dual capacitor.

6. Connect the wire that was originally connected to the fan motor terminal on the old capacitor to the FAN terminal on the dual capacitor.

Make sure to double-check the connections before turning on your HVAC unit to ensure everything is properly connected. If you're unsure about the wiring or encounter any difficulties, it's recommended to consult a professional HVAC technician for assistance. Electrical work can be dangerous if not done correctly.