American Standard, Dry Bulb Economizer without Barometric Relief, BAYECON Series, For YHC048-060 Packaged Gas/Electric Convertible 3-10 Ton Unit;YSC072-120 Packaged Gas/Electric Convertible 3-10 Ton Unit;YHC072-120 Packaged Gas/Electric Convertible 3-10 Ton Unit;THC048-120*_E Packaged Cooling Convertible 3-10 Ton Unit;TSC072*-120_E Packaged Cooling Convertible 3-10 Ton Unit