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When a run capacitor weakens or fails completely, the motor it powers may struggle. You might hear a humming sound, or the motor might fail to spin at all.
Specifications
- Part number: 9181009-12
- Brand: Ice O Matic
- Part type: Capacitor
- Capacitance: 35.0uF
- Frequency: 50/60HZ
- Height: 2 in / 5.08 cm
- Length: 5.2 in / 13.21 cm
- Voltage: 370V
- Width: 2 in / 5.08 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 run capacitor stores electric charge and releases it continuously to support an electric motor. It helps create the necessary phase shift to keep the motor turning smoothly during operation.
If a capacitor loses its charge capability, the connected motor will not run correctly. Often, a fan that hums but will not spin points directly to a failed capacitor rather than a broken motor.
Understanding the 9181009-12 Specifications
Reading the label on your existing part helps ensure you choose the proper match. Here are the exact specifications for this part number:
- Capacitance: 35.0uF
- Voltage: 370V
- Frequency: 50/60HZ
- Length: 5.2 in / 13.21 cm
- Height: 2 in / 5.08 cm
- Width: 2 in / 5.08 cm
Matching Rules for Run Capacitors
When selecting a replacement capacitor, follow strict electrical match guidelines to protect your equipment.
The capacitance rating must always match the old part. A rating of 35.0uF must be replaced with the exact same microfarad rating.
The voltage rating can be the same or higher. For example, a 440 V capacitor can replace a 370 V capacitor, but you can never use a lower voltage rating.
The physical shape and dimensions matter for mounting. Whether round or oval, choose a unit that fits securely inside the mounting bracket.
Safe Replacement Steps
Replacing a capacitor involves working around high-voltage components. Take every precaution before you begin handling wires.
- Shut off electrical power at the main breaker and remove the outdoor disconnect if working on outdoor machinery.
- Confirm power is completely off using a reliable electrical tester.
- Safely discharge the old capacitor terminals using an insulated tool.
- Take a clear photo of the wires and terminals before removing any connections.
- Move the wires one at a time to the matching spots on the replacement unit.
Read your old part
- Locate the printed label on the metal casing of your existing capacitor.
- Look for the part number 9181009-12 printed on the body.
- Check that the capacitance rating reads 35.0uF (also written as MFD or uF).
- Confirm the voltage rating is 370V or that your replacement meets or exceeds this value.
- Measure the height, width, and length to ensure the replacement body fits within your equipment bracket.
When to call a pro
Line-voltage electrical parts can cause serious injury or death. If you do not have the proper tools, cannot discharge the capacitor safely, or are uncertain about any step, stop work immediately and call a licensed HVAC technician.
Questions
Can I replace a 370V capacitor with a 440V capacitor?
Yes. A capacitor's voltage rating must be the same or higher. A 440 V rated unit can safely replace a 370 V unit, but never install a part with a lower voltage rating.
Can I use a capacitor with a different uF rating?
No. The capacitance value, written as uF or MFD, must be the same as the original part. The 9181009-12 requires an exact 35.0uF match.
What is the difference between a single run and a dual run capacitor?
A single run capacitor powers one motor and has two terminals. A dual run capacitor powers two motors from one can and features three terminals labeled HERM, FAN, and C.
Why is my motor humming but not spinning?
A motor that hums without spinning is often caused by a failed capacitor rather than a bad motor. The capacitor provides the required push to turn the motor shaft.
Related part numbers
- 9181009-13Capacitor, Ice-O-MaticSame brand and type
- 9181009-11Capacitor, Ice-O-MaticSame brand and type
- 9181009-16Capacitor Reference Guide, Ice-O-MaticSame part type
- 9181009-09Capacitor Reference, Ice-O-MaticSame part type
- 33010025Air Conditioner Capacitor, CarrierSame part type
- 9181003-26Capacitor Reference, Ice-O-MaticSame part type
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Brand names and part numbers identify the part and show fit. HVAC Fitter is not affiliated with, authorized by, or endorsed by any equipment maker. If you are not sure a repair is safe for you, call a licensed HVAC technician.