York S1-331-02972-000 Control Board Refrigerant Even-hour modules like the A877-20

Even-hour modules like the A877-20 are timed to initiate on even hours of the dial

reducing labor time during component upgrades or repairs

The Belimo ZG-LF112 is a specialized LF crankarm adaptor kit engineered to facilitate the mechanical linkage of LF series spring-return actuators to damper shafts via a crankarm arrangement

Built for durability in both residential and light commercial air conditioning applications

Always check your model plate before installation

York S1-331-02972-000 Control Board Refrigerant Even-hour modules like the A877-20The York S1 331 02972 000 Control Board is a genuine OEM replacement engineered specifically for high efficiency 97% modulating furnaces. As a veteran grade modulating furnace control board, this 2nd generation kit represents the central processing logic required to manage complex combustion cycles and airflow residential profiles. This board is the primary driver for coordinating variable speed blower motor signatures and gas valve modulation,