Last Updated: April 21, 2025

Is your HVAC system or industrial equipment failing to start? The culprit might be a faulty C22 2NO 190 capacitor. This comprehensive guide will walk you through everything you need to know about identifying, safely replacing, and troubleshooting this critical component without breaking the bank.

The C22 2NO 190 capacitor (specifically the 5SP14R302TFM model) is a specialized shunt power capacitor designed for AC power systems up to 46 kV. These high-performance components play a crucial role in:

• Storing electrical energy to stabilize voltage fluctuations
• Improving power factor in electrical systems
• Providing the initial boost needed to start motors in various appliances

You’ll commonly find these capacitors in:

• HVAC units (both outdoor condensers and indoor air handlers)
• Industrial motors and compressors
• Commercial equipment requiring power factor correction

Before you start replacing anything, it’s important to confirm that your capacitor is indeed the problem. Here are the telltale symptoms of a failing C22 2NO 190 capacitor:

• Equipment won’t start: Your appliance might make a humming noise but fails to activate
• Frequent circuit breaker trips: The system trips breakers or blows fuses repeatedly
• Unusual odors: A burnt smell emanating from your equipment
• Visual damage: Bulging, leaking, or visible corrosion on the capacitor itself

If you’re experiencing two or more of these symptoms, there’s a high probability your C22 2NO 190 capacitor needs replacement.

CRITICAL SAFETY WARNING

Capacitors store lethal amounts of electrical energy even after the power is disconnected! Always follow proper safety procedures when handling these components.

Your safety comes first. Before touching any capacitor, follow these critical steps:

Required Safety Gear:

• Insulated rubber gloves rated for electrical work
• Safety goggles to protect your eyes
• Insulated tools with rubber handles

How to Properly Discharge a Capacitor:

1.  1  Turn off all power to the unit at the circuit breaker, not just at the unit switch
2.  2  Verify power is off using a multimeter set to AC voltage
3.  3  Use an insulated screwdriver to short the capacitor terminals:
   • For dual capacitors: Bridge C (Common) to HERM (compressor)
   • Then bridge C (Common) to FAN
4.  4  Confirm discharge with a multimeter set to DC voltage (should read 0V)

Remember: Never assume a capacitor is discharged just because the equipment has been unplugged. Always verify with a multimeter.

Step 1: Power Off and Locate the Capacitor

1.  1  Disconnect all power to the unit at the circuit breaker box
2.  2  Remove the access panel (typically secured with screws)
3.  3  Locate the capacitor (usually cylindrical, often near the motor/compressor)

Step 2: Discharge the Capacitor Safely

1.  1  Put on your safety gear (insulated gloves and goggles)
2.  2  Use an insulated screwdriver to short the terminals
3.  3  Bridge C (Common) to HERM (compressor) terminals
4.  4  Bridge C (Common) to FAN terminals
5.  5  Verify discharge with a multimeter (should read 0V DC)

Step 3: Document and Remove the Old Capacitor

1.  1  Take clear photos of the wiring configuration (crucial for reassembly)
2.  2  Label each wire (C, HERM, FAN) with tape or tags
3.  3  Carefully disconnect wires using needle-nose pliers
4.  4  Unscrew mounting brackets or straps holding the capacitor
5.  5  Remove the old capacitor carefully

Step 4: Install the New C22 2NO 190 Capacitor

1.  1  Verify the new capacitor matches specifications (µF rating and voltage)
2.  2  Place the new capacitor in the same position as the old one
3.  3  Secure it using the mounting bracket or strap
4.  4  Reconnect wires to the matching terminals (use your photos as reference)
5.  5  Ensure all connections are tight and secure

Step 5: Test and Finalize

1.  1  Double-check all connections and mounting security
2.  2  Replace the access panel
3.  3  Restore power at the circuit breaker
4.  4  Turn on the equipment and observe operation
5.  5  Listen for any unusual noises or observe abnormal operation

Even after proper replacement, you might encounter some issues. Here’s how to address common post-replacement problems:

Equipment Still Won’t Start

If your equipment still refuses to start after capacitor replacement:

• Double-check terminal connections for proper placement
• Verify the capacitor specifications match your equipment requirements
• Test the motor with a multimeter for continuity
• Check for wiring damage elsewhere in the system

Circuit Breaker Continues to Trip

If your circuit breaker keeps tripping after replacement:

• Check for short circuits in the wiring with a multimeter
• Inspect for damaged insulation on nearby wires
• Verify the capacitor voltage rating is correct
• Consider consulting a professional if problems persist

When selecting a replacement for your C22 2NO 190 capacitor, keep these compatibility considerations in mind:

What to Match Exactly:

• Microfarad (µF) Rating: Must be within ±5% of original (e.g., 45±5 µF)
• Type: Run capacitor vs. start capacitor (these are not interchangeable)
• Terminal Configuration: Must match the original layout

What Can Be Flexible:

• Voltage Rating: Can use equal or higher voltage (never lower)
• Physical Size: Slightly different dimensions are acceptable if it fits
• Brand: Any reputable manufacturer is acceptable

While replacing a C22 2NO 190 capacitor is often a DIY-friendly repair, some situations call for professional help:

Call a Professional When:

• You observe extensive corrosion or damage to terminals
• The system has damaged wiring beyond the capacitor
• You’re working with high-voltage systems (above 240V)
• Multiple components appear damaged
• You lack the proper tools or safety equipment
• You’re uncomfortable working with electrical components

Potential Savings: The average DIY replacement saves $135-$195, making it one of the most cost-effective home repairs you can perform!

Proper maintenance can significantly extend the life of your new capacitor:

Regular Maintenance Schedule:

• Monthly: Check for unusual noises or operation in your equipment
• Quarterly: Clean dust and debris around the unit’s exterior
• Bi-annually: Inspect the unit’s ventilation for blockages
• Annually: Professionally clean the system and check capacitor visually

Environmental Considerations:

• Shield outdoor units from direct sunlight when possible
• Ensure proper ventilation around equipment
• Consider a surge protector for equipment in areas with unstable power
• Keep ambient temperature within manufacturer specifications

Conclusion: Taking Control of Your C22 2NO 190 Capacitor Replacement

Replacing a C22 2NO 190 capacitor doesn’t have to be intimidating or expensive. With proper safety precautions, the right tools, and this comprehensive guide, you can successfully tackle this repair and save hundreds of dollars in service calls.

Remember that safety always comes first when working with electrical components. Discharge capacitors properly, use insulated tools, and don’t hesitate to call a professional if you encounter complications beyond your comfort level.

Regular maintenance and timely replacement of failing capacitors will extend the life of your expensive equipment and ensure it operates at peak efficiency. By mastering this repair, you’ve added a valuable skill to your DIY toolkit.