Viessmann 7133088 Oil Filter Insert 320720-756 System Efficiency: Reduces heat loss

System Efficiency: Reduces heat loss through the venting system during the off-cycle

While the 221526 is factory-calibrated for Natural Gas

the Raypak pool heater air switch features a durable diaphragm and precise electrical contacts to maintain circuit integrity under standard operating HVAC air pressure switch cycles

it is best professional practice to mount this unit in the original factory orientation to ensure the internal spring and gravity-assisted contacts operate within their calibrated tolerances

abnormally high superheat at the evaporator

Viessmann 7133088 Oil Filter Insert 320720-756 System Efficiency: Reduces heat lossThe Viessmann 7133088 Oil Filter Insert is a critical OEM replacement part engineered for high performance fuel filtration in residential and commercial heating systems. Designed specifically for Viessmann Chassis oil burners and Vitoflame 100 VEM 18 40 series, this cartridge ensures that the oil burner nozzle receives a steady supply of contaminant free fuel. By trapping microscopic sediment and sludge, the 7133088 oil filter prevents irregular flame