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In motor circuits, a start capacitor provides an extra push to help the motor start turning. It is designed to drop out of the circuit once the motor gets up to speed.
Specifications
- Part number: 9181003-26
- Brand: Ice O Matic
- Part type: Capacitor
- Capacitance: 72-86uF
- Frequency: 50/60HZ
- Height: 2.05 in / 5.21 cm
- Length: 4.05 in / 10.29 cm
- Voltage: 330V
- Width: 2.1 in / 5.33 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 start capacitor delivers the stored power needed to start a motor. It is built to supply a quick burst of energy rather than steady running power.
When a start capacitor fails, the motor may hum or fail to spin at all. Replacing a damaged capacitor helps restore proper starting function without damaging the motor windings.
Understanding the 9181003-26 specifications
Every capacitor has ratings printed directly on its casing. You must match these electrical ratings closely to keep the equipment running properly.
- Capacitance: 72-86uF
- Voltage: 330V
- Frequency: 50/60HZ
- Length: 4.05 in / 10.29 cm
- Width: 2.1 in / 5.33 cm
- Height: 2.05 in / 5.21 cm
How to confirm a matching replacement
Capacitor microfarads, written as uF, MFD, or µF, must match the rating on your old part. Start capacitors list a microfarad range, such as 72-86uF, and are not the same as run capacitors.
Voltage ratings can be the same or higher, but never lower. For example, a higher voltage rating can replace a lower one, but a lower voltage rating must never be used. Finally, ensure the physical dimensions allow the can to fit securely into your unit's mounting bracket.
How to replace the capacitor safely
Working around electrical components requires careful safety steps. Always make sure the power is completely off before removing access panels.
- Turn off power at the breaker and pull the outdoor disconnect.
- Test the circuit with a meter to verify that no electrical power is present.
- Discharge the capacitor terminals using an insulated tool before touching them.
- Take a photo of every wire connected to the old part to remember the exact terminal layout.
- Move wires one at a time to the matching spots on the replacement unit.
- Mount the capacitor securely into the mounting bracket.
Read your old part
- Check the old capacitor body to find part number 9181003-26 printed on the label.
- Verify that the capacitance rating on the old unit reads 72-86uF.
- Confirm that the voltage rating reads 330V or lower.
- Check that the physical dimensions fit inside your equipment's mounting clamp.
When to call a pro
If you do not feel comfortable working around high voltage or discharging electrical components, stop immediately. Hire a licensed HVAC technician to inspect your system and perform the repair safely.
Questions
Can I replace a 330V capacitor with a higher voltage rating?
Yes. Capacitor voltage ratings must be the same or higher. A higher voltage rating can safely replace a lower voltage rating, but never use a lower voltage rating.
What is the difference between a start capacitor and a run capacitor?
A start capacitor lists a microfarad range, like 72-86uF, and helps push a motor to get it running. It is used in start circuits and is not a run capacitor.
Why does my motor hum without starting?
A motor or fan that hums but will not spin is often caused by a bad capacitor rather than a bad motor. When the capacitor cannot deliver sufficient starting power, the motor stays stalled.
Is the 9181003-26 a dual run capacitor?
No. A dual run capacitor powers two motors from one can and has three terminals marked HERM, FAN, and C. The 9181003-26 is a start capacitor with a microfarad range of 72-86uF.
Related part numbers
- 9181009-09Capacitor Reference, Ice-O-MaticSame brand and type
- 9181003-21Capacitor, Ice-O-MaticSame brand and type
- 9181009-11Capacitor, Ice-O-MaticSame part type
- 9181003-19Start Capacitor, Ice-O-MaticSame part type
- 9181009-12Capacitor Reference Guide, Ice-O-MaticSame part type
- 12788Capacitor, MarsSame 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.