Only trained and certified HVAC technicians should perform troubleshooting procedures. Systems may contain rotating parts, high temperature or pressure gases, caustic or toxic chemicals, and high voltage electrical components that may cause injury or death. Do not troubleshoot equipment you are not qualified to work on.
Control transformers are not sized to provide power for field-added components such as dampers, solenoid valves, or isolation valves unless specifically noted. If any components have tapped into the control power, this may be the source of electrical or control power issues. Powering third-party components from the unit’s control power may void any remaining warranty coverage at the discretion of AboveAir Technologies.
Do not work on any rotating parts until they have come to a complete stop.
Do not work on refrigeration components unless you have an EPA Type II or Universal certification. All work must be completed in accordance with applicable EPA procedures.
If power is not required for the troubleshooting procedure, lock out and tag out the unit.
Verify that you have all tools necessary for troubleshooting. Refrigerant gauge manifolds rated for the refrigerant indicated on the nameplate, temperature sensors, multi-meters, vacuum gauges, or other tools may be required as part of troubleshooting procedures.
Current measurements must be done in series for low voltage VAC or VDC components. High voltage current measurements should be taken with a clamp-on ammeter.
Troubleshooting a circuit requires using the hopscotch method: a series of measurements must be taken beginning from the voltage side of the circuit and moving towards the load device or controller input to determine which component is open or if the load device is faulty.