Are Contactors Obsolete? (SureSwitch)

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The photo above is of a real condenser coil we cleaned just the other day. The outer fins looked OK, but dirt and lint were packed deep inside, and the head pressure and condensing temperature were sky-high. That situation illustrates that a coil can sometimes look OK at first glance but may still need to […]
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Disconnects walk the fine line of being HVAC or electrical, but the HVAC technician is allowed to repair and replace disconnects in most places. Even if you work at a place where it isn't allowed, finding problems is a diagnostic skill you will want to have. As always, work safely with proper safety gear and […]
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Non-noncondensables
  Flowing nitrogen while brazing and pressuring with nitrogen are great practices. What about putting nitrogen in with the refrigerant? Not so much. Nitrogen is a “non-condensable” gas because it cannot be condensed (under normal conditions), but nitrogen isn't the only non-condensable. First, let's talk about what a non-condensable gas is. Any gas that does […]
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