ClimaTek Furnace 2-Stage Control Gas Valve Replaces Carrier Bryant Payne EF33CW196 EF33CW196A. This is a new ClimaTek Furnace 2-Stage Control Gas Valve. It replaces the part numbers listed below. The gas valve is a low voltage control (usually 24 VAC) that allow gas into the combustion chamber. It is also an adjustable regulator that insures proper gas pressure for combustion. They have a manual shut off. Replaces Old Part #s. Partial List of Units that Use This Item. Hit Ctrl + F and enter your model number for a quick search!