NEW YORK (Bloomberg) — Bermuda-based Ingersoll-Rand Co., the refrigeration-equipment maker that's buying Trane Inc., plans to keep the acquired company as a separate unit rather than combine it with its own climate-control operations.

The "guiding principle" of the $9.95 billion acquisition is that "customers should not really know anything has happened", James Gelly, chief financial officer of Ingersoll-Rand, said at the Morgan Stanley Electrical Products Group Conference yesterday. The purchase is still projected to close on June 5.

The Trane purchase will give Ingersoll-Rand $11 billion of climate-control sales this year, when combined with its Hussmann and Thermo King brands. Still, "crashing" the businesses together would create the possibility of "maximum disruption", Gelly said.

Ingersoll-Rand still projects combined efficiencies will produce cost savings of $300 million within three years, the target that was announced in December when the planned Trane purchase was disclosed.

"They have in most cases, I would say the vast majority, utterly separate distribution, customers and business models," Gelly said in the webcast presentation from Longboat Key, Florida.