1. Introduction
This document provides essential information for the Trane/American Standard OEM Dual Run Capacitor, models 27L18, CPT00667, and CPT-0667. This capacitor is a genuine original equipment manufacturer (OEM) component designed for use in various Trane and American Standard HVAC systems. It is a dual-rated capacitor, providing capacitance for both the compressor and fan motors.
2. Safety Information
WARNING: Electrical Hazard. Risk of electric shock, explosion, or arc flash.
- Always disconnect power to the HVAC unit at the main breaker before attempting any installation, maintenance, or troubleshooting.
- Capacitors can store a dangerous electrical charge even after power is disconnected. Always discharge the capacitor using an insulated screwdriver or appropriate tool before handling.
- Installation and service should only be performed by qualified, trained HVAC technicians.
- Wear appropriate personal protective equipment (PPE), including insulated gloves and eye protection.
- Ensure all wiring connections are secure and correct according to the unit's wiring diagram.
3. Product Description and Features
The Trane/American Standard OEM Dual Run Capacitor is a round, 35/4 MFD (microfarad) capacitor rated for 440 Volts AC. It is manufactured by CAPCOM and is a genuine OEM replacement part, ensuring compatibility and performance with specified Trane and American Standard units. This dual capacitor provides two capacitance values in a single unit, typically for a compressor motor (35 MFD) and a fan motor (4 MFD).
Image 1: Trane/American Standard OEM Dual Run Capacitor (27L18 / CPT00667) shown with its original packaging box.
Image 2: Close-up view of the Trane/American Standard OEM Dual Run Capacitor, highlighting the label with specifications.
Image 3: A stamp indicating 'Genteq is now CAPCOM', signifying the manufacturer.
4. Setup and Installation
This capacitor is a replacement component. Proper installation requires adherence to safety protocols and technical expertise. It is strongly recommended that installation be performed by a certified HVAC professional.
General Installation Steps (for qualified technicians only):
- Power Disconnection: Turn off all power to the HVAC unit at the main electrical panel. Verify power is off using a voltage tester.
- Access Capacitor: Locate and open the electrical access panel on the outdoor unit (condenser).
- Discharge Old Capacitor: Using an insulated screwdriver with a plastic or rubber handle, carefully short the terminals of the old capacitor to discharge any stored electrical energy. Hold the screwdriver across the terminals for several seconds.
- Note Wiring: Take a clear photograph or draw a diagram of the existing wiring connections to the old capacitor. Note which wire goes to 'HERM' (compressor), 'FAN' (fan motor), and 'C' (common).
- Remove Old Capacitor: Disconnect the wires from the old capacitor and remove it from its mounting bracket.
- Install New Capacitor: Place the new Trane/American Standard OEM capacitor into the mounting bracket. Connect the wires to the corresponding terminals on the new capacitor:
- HERM: Connect the compressor wire.
- FAN: Connect the fan motor wire.
- C (Common): Connect the common wire(s).
- Secure and Test: Ensure all connections are tight. Close the electrical access panel. Restore power to the HVAC unit and test its operation.
Image 4: Top view of the capacitor showing the three terminals for 'HERM', 'FAN', and 'C' connections.
5. Operating Principles
A run capacitor is an electrical component used in AC motors, such as those found in HVAC compressors and fan motors. Its primary function is to create a phase shift in the electrical current supplied to the motor's start winding, which helps the motor start and run efficiently. It remains in the circuit during the motor's operation, providing a continuous phase shift to maintain optimal motor performance and reduce energy consumption.
6. Maintenance
Run capacitors are sealed units and generally require no routine maintenance. However, periodic visual inspection by a qualified technician during routine HVAC system checks is recommended. Look for:
- Swelling or Bulging: The top or sides of the capacitor should not appear swollen or bulging.
- Leaks: Check for any signs of oil leakage around the terminals or body.
- Corrosion: Inspect terminals for corrosion or loose connections.
Any of these signs may indicate a failing capacitor that requires replacement.
7. Troubleshooting
A failing run capacitor can cause various issues in an HVAC system. Common symptoms include:
- Compressor Hums but Doesn't Start: The outdoor unit makes a humming noise but the compressor does not engage.
- Outdoor Fan Runs Slowly or Not at All: The fan motor may struggle to start or operate at reduced speed.
- System Not Cooling/Heating Efficiently: Reduced performance of the HVAC unit.
- Unit Tripping Breaker: A severely failed capacitor can sometimes cause the unit to draw excessive current.
To diagnose a capacitor, a qualified technician can use a multimeter with a capacitance testing function. The measured capacitance should be within +/- 5% of the rated value (35 MFD for compressor, 4 MFD for fan).
8. Specifications
| Specification | Value |
|---|---|
| Capacitance | 35/4 MFD (Microfarad) |
| Operating Voltage | 440 VAC |
| Shape | Round |
| Material | Copper (internal components) |
| Product Dimensions | Approximately 4 x 4 x 4 inches |
| Weight | Approximately 1 Pound |
| Model Number (Internal) | CAP00667_ver1 |
| Manufacturer | Trane (OEM Component by CAPCOM) |
Image 5: Dimensional drawing of the capacitor, indicating a diameter of 2 1/2 inches and a height of 2 7/8 inches.
9. Replacement and Compatibility
This OEM capacitor is designed to replace or supersede several part numbers, ensuring broad compatibility with various Trane and American Standard HVAC units. Always verify the required capacitance (MFD) and voltage (VAC) against your existing capacitor or unit specifications before replacement.
Replaces / Supersedes:
- CPT00810, CPT0810, CPT-0810
- C3354R, C4354R
- 27L18, JC1587480
- CPT0667, CPT-0667, CPT00667, CPT667
- Other 35 + 4 x 440 VAC Round Capacitors
Commonly Found in American Standard Units (Examples):
6H2018A100A0, 6H2018A100A1, 6H2018A100A2, 6H2018A100A3, 6H2024A100A2, 6H2024A100A3, 6H2024A100A4, 6H2024A100A5, 6H4018A100A0, 6H4018A100A1, 6H4018A100A2, 6H4018A100A3, 6H4018B100A0, 6H4018B100A1, 6H4024A100A3, 6H4024A100A4, 6H4024B100A0, 6H4024B100A1, 7A2018A100A0, 7A2018A100A1, 7A2024A100A0, 7A2024A100A1, 7A2024A100A2, 7A4018A100A0, 7A4018A100A1, 7A4018B100A0, 7A4024A100A1, 7A4024B100A0, 7B0023A100A0, 7B0023A100A1, 7B0023B100A0, 7B0023B100A1, 7B0520AA00A0, 7B0523A100A0, 7B0524A100A0, ATP018C100A1, ATP018C100A2, ATP024C100A2, ATR024C100A1, ATR025C100A1, ATR025C100A2, AWP018C100A1
Commonly Found in Trane Units (Examples):
TTB024C100A0, TTB024C100A1, TTB024C100A2, TTB510CA00A0, TTB510CA00W0, TTB512C100A0, TTB515CA00A0, TTB518C100A0, TTB520CA00F0, TTJ012C100A1, TTJ012C100A2, TTJ018C100A1, TTJ018C100A2, TTJ024C100A1, TTJ024C100A2, TTN024D100A2, TTP018C100A1, TTP018C100A2, TTP024C100A2, TTP024C100A3, TTR024C100A1, TTR025C100A1, TTR025C100A2, TTR025C100A3, TTR025C100A4, TWP018C100A1, TWP018C100A2, TWP024C100A2, TWP024C100A3, TWP024C100A4, TWY018B100A1, TWY024B100A1
10. Warranty and Support
For warranty information or technical support regarding this Trane/American Standard OEM capacitor, please refer to the documentation provided with your HVAC unit or contact the original seller or Trane/American Standard directly. Keep your purchase receipt for warranty claims.
