Resideo ST9103A1002 Electronic Fan Timer 340155-7026 Industrial Durability: Forged brass body

Industrial Durability: Forged brass body and NBR (Nitrile) seals ensure long-lasting performance in water and light liquid applications

including PTAC units and water source heat pumps (WSHP)

For technicians managing modulating pressure or varying load conditions

while the internal overload protection safeguards the motor against thermal spikes

this unit draws power directly from the boiler control board interface once connected

Resideo ST9103A1002 Electronic Fan Timer 340155-7026 Industrial Durability: Forged brass bodyThe Resideo ST9103A1002 serves as a robust electronic fan timer for modernizing HVAC furnace controls in both oil and gas applications. As a direct replacement electronic fan timer for the legacy 20123101 model, this unit functions as the primary 18 30 Vac interface for the combustion air blower, circulating fan, and oil primary control circuit. It features a fixed 45 second heat on delay and adjustable fan off delay settingsconfigurable to 60, 90,