#ice machine

Tech Tips:

This article was written by Austin Higgins, an experienced commercial service tech from Iowa. Thanks, Austin! Ice machines and limescale Any seasoned refrigeration technician knows that ice machines can be extremely finicky contraptions. Modern commercial ice makers have become a complex symphony of tubing, valves, pumps, and water directed by advanced microprocessor control boards. Newer […]

Ice Machines – Cuber, Flaker & Nugget Basics

There are several types of ice machines, but in this article, we will focus on cuber style and flaker or nugget style. Both types produce ice, but the process of freezing and harvesting is a little different. The application in which the ice will be used will determine what style of machine is needed. I […]

Ice Machines and Tech Support w/ Nick Messick

Bryan talks with Nick Messick about some ice machine basics. They also discuss how to determine when to pick up the phone and call tech support. Ice machines have the same basic refrigeration circuit as HVAC systems. However, ice machines require a much different cleaning regimen. Many maintenance people neglect ice machines by using incorrect […]

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In this short podcast episode, Bryan goes through the process of testing and replacing a run capacitor.

Run capacitors provide continuous phase-shifted current to the start winding, allowing the motor to run in the right direction and with the appropriate amount of torque. These capacitors are needed in most of the single-phase PSC motors we work with. Run capacitors are in the circuit all the time and are connected in series with the start winding (compared to start capacitors, which need to be taken out of the circuit after startup). They don’t actually “boost” voltage. The bigger the capacitor, the more current can move in and out of the start winding.

Run capacitors are made of foil and oil (and the manufacturing quality usually correlates to the capacitor’s lifespan), and they usually fail due to overvoltage or overheating. Capacitors may also be replaced with one of a higher voltage rating but not a lower one.

Before you test a capacitor, perform a visual inspection. Bloated tops and oil leakage are signs of failure. You’ll also want to measure the microfarads and make sure it’s within range. An under load test occurs while the system is running (and should NOT be done on blower capacitors for safety reasons). Bench testing happens while the system is off and the capacitor is disconnected and discharged. We have calculators for testing on our app.

To test under load, measure the amperage on the start wire and multiply it by 2652. Then, divide that number by the voltage to find the capacitance in microfarads. If the capacitance is over 10% low, replace the capacitor. When replacing a capacitor, make sure the system is off, the capacitor is discharged, and that you tighten the strap and wire it up correctly. It’s also a good idea to bench test the new capacitor.

“Capacitor Testing and Replacement Procedure” tech tip: https://www.hvacrschool.com/capacitor-testing-and-replacement-procedure/

“What Is Up With Blower Amps & Watts w/ Steve Rogers” podcast: https://www.hvacrschool.com/podcasts/what-is-up-with-blower-amps-watts-w-steve-rogers/

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Capacitor Testing and Replacement – Short #247

07/01/2025

Bryan Orr

Cold Coil vs. Desiccant Dehumidification