installing this pneumatic air filter is standard protocol during preventative maintenance to protect sensitive thermostats and controllers from oil aerosols and water carryover

it is designed to provide the primary components needed to replace the isolation valves on the compressor head

The coiled element on the A19BAC-15 is specifically designed for ambient air temperature sensing

preventing compressor overheating and extending the lifecycle of the outdoor unit

allowing for proper control of the compressor and an auxiliary or emergency heat strip on single-stage heat pump platforms

Nordyne 920806 Control Board 320788-703 installing this pneumatic air filterThe Nordyne 920806 Defrost Control Board is a direct OEM replacement component engineered for high efficiency heat pump systems. Designed to manage the defrost cycle by monitoring ambient temperature and coil thermistor resistance, this board ensures optimal heat exchange during low temperature operation. It features integrated timing logic to prevent excessive frost buildup on the outdoor coil, protecting the compressor from liquid slugging and