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Packaged Rooftop Air Conditioners Voyager Cooling and …
www.trane.comrequirements. The negative pressure gas valve is us ed in the standard furnac es. This is one of our unique safety features. Modulating heaters use a pr essure switch to ensure that the blower motor is operating before the gas valve is allowed to open. The forced combustion blower supplies pre-mixed fuel through a single stainless steel burner