What does a color change in the sight glass signify

protecting the start windings from overheating

the Lennox 86H56 ball bearing provides critical vibration isolation and HVAC noise reduction

Designed to step down 480V primary voltage to a stable 24V secondary output

Trane VAL20518 Expansion Valve 30067439-890 What does a color changeThe Trane VAL20518 Expansion Valve is a genuine OEM 3 ton thermostatic expansion valve (TXV) specifically engineered for residential and light commercial HVAC systems utilizing R22 refrigerant. As a critical component in the refrigeration cycle, this valve regulates the flow of refrigerant into the evaporator coil based on heat load, maintaining precise superheat control. For technicians replacing failing metering devices, the VAL20518 is the direct