CNT02536 Trane-American Standard XV90 (2) stage-variable CNT02536 Trane-American Standard XV90 (2) stage-variable speed Gas Furnace Control. Trane 2 Stage Heating- Variable Speed Furnace Circuit Board CNT02536 is now obsolete. This control has been replaced by Trane with KIT15017, KIT15018, KIT15019 or KIT15020. Trane Replacement Heating and Air Conditioning Parts Buy, Order any kind of Trane Parts, Trane HVAC Parts, Trane Furnace Parts and many other products. Also parts for many other brands of furnaces, heat pumps and air conditioners.