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For technicians troubleshooting furnace short cycling or safety lockouts
a technician can rotate calibration screws clockwise to increase branch line pressure or counterclockwise to decrease it
utilize light pressure and verify tooth alignment with the specific FPI to avoid piercing the flat tubes
the QC-0 cartridge provides a nominal capacity of 1/6 ton for R-12/R-404A and 1/3 ton for R-22 applications
White-Rodgers 90-476 Fan Relay For technicians troubleshooting furnace shortThe White Rodgers 90 476 is a heavy duty enclosed fan relay engineered for switching high voltage HVAC loads in commercial and industrial applications. This SPDT fan relay features a 277 VAC coil specifically designed for 50 60 Hz systems, providing a reliable interface for fan motor control and general heating or cooling switching. With a 10300 Ohms DC resistance and a nominal current draw of 10. 8 mA, this relay maintains high efficiency with a 3 VA
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