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Rooftop HVAC Unit Maintenance 101

Being proactive with regular routine maintenance of rooftop HVAC units is only a smart idea.  Otherwise…dealing with every little performance issue as they arise can not only be costly…with respect to replacement parts and labor, as well as the excess energy costs while the equipment is underperforming.

Routine maintenance on a scheduled basis helps to identify problems BEFORE they occur…so they can be corrected to avoid the cost of major repairs later.  These basic steps are a good guideline to follow when performing scheduled maintenance on rooftop units.

  1. Power Check – After making sure the unit has power…look for any service lights or faults codes as a clue to any potential problems.  Usually powering down (turning off) the main unit, then turning it back on will reset the unit control board…potentially losing any fault codes displayed.  Fault codes may be displayed on the unit itself (viewable through a small sight-glass near the electrical service panel) or on the thermostat.  Adjust the temperature set-point on the thermostat and listen for a clicking noise, indicating that the thermostat relays are engaging.
  2. Visual Check – Look for oily or greasy areas on the unit as potential signals of a refrigerant leak.  Closely inspect the condenser and evaporator coils…seeing if they need to be cleaned. Ice on the evaporator may mean a low-refrigerant charge or “low airflow” due to a dirty or too restrictive air filter.
  3. Electrical Connections Tight? – After a good visual inspection for warning signs of any service problems that need addressed…turn off the power to the unit and begin the maintenance process by tightening all electrical connections. Many failures on units are due to loose wiring. Be careful when tightening the electrical connections on the compressor: if they appear damaged or overheated in any way, the terminal connections may be compromised. If the capacitors appear to be deformed (swelled or leaking) consider replacing them, as they may be nearing the end of their life-cycle.

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