Servicing HVAC Equipment

 

Overview

With all of the various types of HVAC equipment, it is important to design a maintenance program that focuses on the critical functions of that specific piece of equipment. The primary focus when servicing HVAC equipment is to check the operation of the unit. The system operation check will include the following:

  • Observation of the sequence of operations
  • Measuring the system parameters
  • Comparing the readings to the design requirements
  • Measuring the amperage and voltage on electrical components and comparing to specifications
  • Checking both the heating and cooling modes of operation
  • Testing the limit and safety controls

Steps in servicing a standard package roof top unit

As with any trade, each technician develops their own process for how they go about servicing a piece of equipment. The list below includes the items that need to be performed when servicing a roof top package unit:

  • Visually inspect the outside of the unit and listen for odd sounds like bad fan motor bearings or compressor noises.
  • TURN OFF the electrical power to the unit
  • Remove existing filter and inspect the evaporator coil and duct. Replace filter with a new pleated filter that will catch fine particles. If you can see through a filter then you are not using a high quality filter.
  • Check belts for wear and inspect the sheave for grooves and wear. Replace belts when worn and at least annually.
  • Check electrical connections and tighten any loose wires. Loose wires can short out expensive components and significantly increase repair expenses.
  • Inspect condenser coil, straighten fins and clean the coil
  • Turn power back on and check system operation to include:
    • Refrigeration pressure readings
    • Temperature readings across the coil
    • Electronic components voltage and amperage readings
    • Duct pressures

Summary

As you can see from the list above, maintaining your equipment involves much more than just changing the filters and the belts. A proper maintenance program will extend the life of your equipment, reduce the long term equipment costs and lower energy consumption.