Measuring Line Temperatures
Measuring line temperatures — Checking a system without gauges requires very accurate and consistent line temperature measurements at various points. Quality wireless temperature clamps make this much easier.
Measure Deltas T and H
Delta T and Delta H — Using an in-duct psychrometer to measure changes in dry bulb, wet bulb and humidity over the evaporator coil can tell you a lot about air flow, capacity and dehumidification performance.
Measure Outdoor Air
Outdoor air — Measuring the inlet air on the condenser should be done in the shade. Some technicians also like to measure the condenser air Delta T.
Putting it All Together
Putting it all together — When you measure line temperatures inside and out and the evaporator enthalpy split (Delta H) and take electrical measurements, you can learn as much about the performance of the system as you can with gauges alone.