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When a run capacitor goes bad, the motor may hum without spinning, or it may stop running altogether. Replacing a failed unit restores proper motor operation.
Specifications
- Part number: 9181009-16
- Brand: Ice-O-Matic
- Part type: Capacitor
- Capacitance: 30.0uF
- Frequency: 50/60HZ
- Height: 1.8 in / 4.57 cm
- Length: 3.5 in / 8.89 cm
- Voltage: 370V
- Width: 1.8 in / 4.57 cm
- µF (MFD): must be the same, like 45/5
- Volts: same or higher (440 can replace 370)
- Shape: round or oval, to fit the bracket
From the maker's and parts sellers' listings for this number. Compare them with the label on your old part.
What This Capacitor Does
A capacitor stores an electrical charge to support electric motors. It provides the initial boost to get the motor moving and helps maintain steady operation during the run cycle.
A single run capacitor uses two terminals to serve a single motor. If the capacitor becomes weak or fails completely, the motor cannot run properly and will often make a humming sound.
Understanding the Specs
Reading the label on your old part ensures you select the correct replacement. Every rating on the metal case must align with your system requirements.
The 9181009-16 part number carries specific electrical and physical ratings:
- Capacitance: 30.0uF
- Voltage: 370V
- Frequency: 50/60HZ
- Length: 3.5 in / 8.89 cm
- Width: 1.8 in / 4.57 cm
- Height: 1.8 in / 4.57 cm
How to Confirm a Match
When comparing parts, microfarads must always match the original rating exactly. Voltage can be the same or higher. A 440 V capacitor can replace a 370 V capacitor, but you must never use a lower voltage rating.
The physical shape and size must also fit the mounting bracket in your unit. Round and oval shapes with the same electrical ratings do the same work, as long as the bracket holds the case securely.
Signs of Failure and Safe Replacement Steps
A common sign of a bad capacitor is a motor that hums but will not spin. The top of the metal can may also look bulged or swollen. Replacing it requires careful attention to electrical safety.
- Shut off power at the main breaker and pull the disconnect switch. Test the lines to verify no voltage is present.
- Discharge the old capacitor terminals using an insulated tool.
- Take a clear photo of the wire connections before removing anything.
- Disconnect the wires and remove the old part from its mounting bracket.
- Mount the new part and move the wires one at a time to the matching terminals, using your photo as a guide.
Read your old part
- Find the printed label on the side of your existing capacitor.
- Check that the part number lists 9181009-16.
- Confirm the capacitance rating reads 30.0uF.
- Verify the voltage rating shows 370V.
- Measure the case to ensure it fits the dimensions of 3.5 in / 8.89 cm length, 1.8 in / 4.57 cm width, and 1.8 in / 4.57 cm height.
When to call a pro
Hire a licensed HVAC technician for any step you are not sure you can do safely. If you do not have the proper tools to test power or discharge the capacitor, stop and call a professional.
Questions
Can a 440 volt capacitor replace this 370 volt model?
Yes. Voltage ratings must be the same or higher, so a 440 V capacitor can replace a 370 V unit. You can never go lower than the original voltage rating.
Can I use a capacitor with a different uF rating?
No. The capacitance value must match the original part exactly. This part requires 30.0uF.
Why does my fan motor hum but refuse to turn?
A fan that hums but will not spin is often caused by a bad capacitor rather than a failed motor. The capacitor provides the push needed to start rotation.
Is this a single or dual run capacitor?
A single run capacitor has two terminals and serves one motor. A dual run capacitor powers two motors from one can and features three terminals labeled HERM, FAN, and C.
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