The FARVIO‑CBB65B‑AC Capacitor (45/5 MFD ±5%, 370/440V dual run) is a UL‑recognized, outdoor‑rated HVAC run capacitor designed for air‑conditioner and heat‑pump condenser units. It’s built as a direct‑fit, DIY‑replacement capacitor for the compressor and condenser fan motor, with auto‑discharge, high‑temperature rating, and self‑healing/ P2‑protection features for safer, more reliable operation.

This capacitor is suitable for homeowners comfortable with basic electrical work who want to repair a faulty outdoor unit or replace a weak capacitor without calling a technician every time. However, electrical work on AC/heat‑pump systems should always be approached with caution and safety in mind.

In this review, you’ll see the specifications, safety features, installation basics, and whether this is a good fit and replacement for common 45/5 µF 370–440V AC/heat‑pump run‑capacitor setups.

1. Key Specifications

1.1 Electrical Ratings

• Capacitance: 45/5 MFD (45 + 5 µF).

  • 45 µF for the compressor (HERM).

  • 5 µF for the condenser fan (FAN).

• Voltage rating: 370/440 VAC, 50/60 Hz.

  • A 440V‑rated capacitor can safely replace a 370V unit of the same µF values (but never the reverse).

• Tolerance: ±5%.

• Terminals: Labeled C (Common), FAN/F (Condenser fan), HERM/H (Compressor).

This is a dual‑run / dual‑start CBB65B‑type capacitor, so it handles both the compressor and fan motor in a typical central‑AC or heat‑pump condenser.

1.2 Physical and Thermal Rating

• Case: Round, aluminum case with labeled terminals.

• Dielectric: Metallized polypropylene (MPP) film, non‑PCB construction.

• Size: Approximately Ø2.17 × 4.13 in (55 × 105 mm), which fits most 2.1–2.2 in (54–56 mm) mounting straps (with optional small shims for larger straps).

• Temperature rating: Operates from −40°F to 185°F (−40°C to 85°C), so it is high‑temperature‑rated for outdoor condenser units that heat up in the sun.

For outdoor AC and heat‑pump systems, this wide operating‑temperature range helps maintain stable performance even on very hot days.

2. Safety and Protection Features

2.1 Auto‑Discharge Resistor

• Some AC capacitors can hold a dangerous residual charge even after the power is turned off.

• FARVIO’s capacitor includes a built‑in discharge resistor that bleeds off voltage over time, reducing the risk of electric shock during replacement.

However, you should still treat capacitors as live until you verify with a multimeter, and always disconnect power at the breaker or disconnect switch before working.

2.2 Self‑Healing and P2‑Rated Construction

• Self‑healing (MPP film) helps the capacitor recover from small internal faults or short circuits, improving long‑term reliability.

• P2 protection helps reduce the risk of bulging or rupturing under stress or high temperature, which is important for outdoor, high‑load AC‑system use.

These features are valuable because a failing or weak capacitor can cause slow‑starting, reduced cooling, or complete compressor/fan failure in an AC or heat‑pump system.

2.3 Certifications and Quality

• UL Recognized (UL File No. E342198).

• RoHS compliant (no hazardous substances).

• Manufactured in an ISO 9001‑certified facility, which indicates a consistent quality‑control process for production.

These marks help give you a degree of confidence that this is a properly tested and safety‑rated industrial‑grade component, not just a low‑cost generic capacitor.

3. Compatibility and Use Cases

3.1 Where It’s Used

This CBB65B dual‑run capacitor is designed for:

• Outdoor condenser units of central air‑conditioning systems.

• Heat‑pump units that use a common capacitor for both compressor and fan motor.

It is not for indoor units alone; it connects only to the outdoor‑unit run motors (compressor and fan).

3.2 When to Replace

You may need to replace a capacitor if you notice:

• AC unit or heat‑pump doesn’t start or struggles to start.

• Compressor hums but doesn’t fully start.

• Fan motor runs slowly or doesn’t run at all.

• Tripped breakers or blown fuses repeatedly after running for a while.

Testing the existing capacitor with a capacitance meter (or multimeter with capacitance function) and comparing the reading to the µF rating on the old capacitor (45/5, 370/440V) will help you decide if replacement is needed.

As long as the microfarad ratings match and voltage is equal or higher, the FARVIO‑CBB65B‑AC is a suitable replacement.

4. Wiring and Installation Basics

4.1 Terminals and Wiring Guidance

The product includes a wiring guide and color‑coded labels:

• C (common, black) – Returns to the power source/common side of the system.

• FAN/F (fan, green) – Connected to the condenser‑fan motor.

• HERM/H (compressor, white) – Connected to the hermetic compressor motor.

These match standard 3‑wire dual‑capacitor terminal layouts used in many AC/heat‑pump systems.

4.2 Simple DIY Steps (Outline)

If you are comfortable working with electrical systems, typical replacement steps include:

1. Turn off power at the breaker or disconnect for the AC/heat‑pump.

2. Remove the access panel to expose the capacitor and wiring.

3. Take note of the wiring on the old 45/5 capacitor, then disconnect it.

4. Install the new FARVIO‑CBB65B‑AC capacitor in the same position, securing it with the metal strap or small shim if needed.

5. Reconnect the common, fan, and compressor wires to their labeled terminals (C, F, H) exactly as the old unit was wired.

6. Close the panel, restore power, and test the system.

Always follow the instructions in your HVAC unit’s manual and, when in doubt, consult a qualified HVAC technician.

5. Pros and Cons

Pros

• Correct spec for common residential AC/heat‑pump setups – 45/5 µF, 370/440V, dual‑run dual‑start CBB65B type.

• High‑temperature rating (up to 185°F) – Suitable for hot, sun‑exposed outdoor condensers.

• Auto‑discharge resistor – Helps reduce residual‑voltage risk during DIY replacement.

• Self‑healing and P2‑rated construction – Improves long‑term reliability and reduces failure modes.

• UL‑recognized, RoHS compliant, ISO‑9001‑made – Strong safety and quality credentials.

• Compact, standard size – Fits most 2.1–2.2 in mounting straps; easy to retrofit.

Cons

• Electrical component with safety risk – Working with capacitors and AC power is dangerous if you’re not trained.

• Not a universal fit for all systems – Some HVAC units use different µF or single‑run capacitors; check the old unit before buying.

• May require a shim or strap modification if your existing bracket is slightly larger or smaller.

6. Who Should Buy This Capacitor?

The FARVIO‑CBB65B‑AC 45/5 MFD 370/440V dual‑run capacitor is best for:

• Homeowners with experience in basic HVAC electrical work who want a DIY replacement for a failing capacitor.

• People whose existing outdoor AC/heat‑pump capacitor is labeled 45/5 MFD, 370/440V, dual‑run (CBB65B‑type).

• Anyone who appreciates UL‑recognized, high‑temp‑rated, self‑healing, P2‑protected capacitors for outdoor AC systems.

It is not recommended for:

• People who are uncomfortable with household electrical work.

• Users whose HVAC unit has different microfarad requirements or a non‑CBB65B configuration.

7. Frequently Asked Questions

Q1. Can a 440V capacitor replace a 370V one?
Yes. A 440V capacitor is rated for a higher voltage, so it can safely replace a 370V capacitor with the same µF value. However, you should never use a 370V unit where 440V is required.

Q2. Is this safe for heat‑pump systems?
Yes. Heat‑pump outdoor units commonly use dual‑run 45/5 µF 370/440V capacitors for the compressor and fan motor, just like central‑AC units.

Q3. Do I need a professional to install it?
If you do not feel confident working with live or potentially charged circuits, you should have a qualified HVAC technician handle the replacement. Safety first.

8. Final Verdict

The FARVIO‑CBB65B‑AC Capacitor (45/5 MFD, 370/440V, dual run) is a well‑specified, UL‑recognized, high‑temperature outdoor capacitor designed for central‑AC and heat‑pump condenser units. With auto‑discharge, self‑healing, P2‑protection, and standard wiring labels, it makes a sensible, DIY‑friendly replacement for a weak or failed 45/5 µF 370/440V dual‑run capacitor.

If you:

• Are replacing a 45/5 MFD, 370/440V dual‑run capacitor in an AC or heat‑pump unit.

• Appreciate UL‑recognized, high‑temp‑rated, self‑healing construction.

• Have the skills and safety awareness for basic electrical work on HVAC systems,

then the FARVIO‑CBB65B‑AC is a solid, quality‑minded choice for your DIY capacitor replacement.

Affiliate disclaimer:
This article may include affiliate links. If you purchase the FARVIO‑CBB65B‑AC Capacitor through these links, I may earn a small commission at no extra cost to you. This helps support honest, independent product reviews. All opinions are based on the product specifications and general HVAC‑component principles, not on any paid relationship.