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Re: The R-32's are being assigned to the ''J'', Why?

Posted by Train Dude on Thu Jul 4 09:51:53 2013, in response to Re: The R-32's are being assigned to the ''J'', Why?, posted by Bill from Maspeth on Thu Jul 4 09:15:29 2013.

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To clarify - it's not fresh air that they need. It's cooler air. Because of the contained heat in the tunnels, and the old & inefficient condensers on the R-32s, the A/C motors run up to 135 degrees F. Unfortunately, the R-32 A/C compressor motors have thermal overload switches that open at 130 degrees to protect the motor. The A/C then shuts down until the ambient air cools the motor to a point where the thermal overload switch will close and the unit will run again. Since the outside air is cooler than the tunnel air, the units will operate continuously when operated outside rather than in a tunnel.

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