Reznor 94777 Burner Tube Els PW 17895 and the "20" is the

and the "20" is the temperature differential

If the reversing valve is not shifting and you have confirmed 24VAC at the coil

This unit utilizes a ring mounting base

ensuring proper fitment and terminal alignment

Reznor 94777 Burner Tube Els PW 17895 and the "20" is theThe Reznor 94777 Burner Tube is a high grade OEM replacement part engineered for industrial and commercial gas fired unit heaters. Constructed from heavy duty aluminized steel, this aluminized burner tube is designed to withstand the intense thermal cycling common in Reznor HVAC systems. Its aluminum silicon alloy coating provides critical corrosion resistance, preventing the premature oxidation and scaling that often lead to burner failure in high