Short Cycling: A/C Unit Serving Elevator Machine Room


$5,000 capital investment delayed by approximately 3.5 years.

The Background

As the outside temperature rose during the day, the off-cycle shortened to 13 minutes with the A/C unit cycling on/off four times per hour.

If the A/C unit is oversized, which is common, it will cycle on and off in rapid succession, reducing performance and shortening the unit’s useful life. This drop in performance periodically caused the elevator circuit panel to overheat and cause an elevator shutdown.


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Comly Wilson