best way to test high temp, limits

hvac apprentice sent to pm package unit. heat is from air to air heat exchange and the air in facility is very dusty (printing presses). what is the best way to test high temp limit in this case? Thank You in advance.
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Paul C wrote:

The best way would be send a real tech out. One that has sense to put a temperature probe near the limit, disable the fan, and light the fire. Watch and see if and at what temperature it trips at. The apprentice should be trained on preforming PMs before thrown to the wolves to avoid damaging the equipment or worse, himself.
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On Tue, 17 Oct 2006 06:18:41 -0400, snipped-for-privacy@webtv.net (Paul C) wrote:

Replace it silly. If you dont know how to test it, then its gotta be bad. Replace the thermostat while you're at it. Install a few of those reverseflo@ductboosters too, just for good measure. Bubba
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