Air Handlers
Items to be checked
Problems might happen due to
Check
Check if the unit has been earthed
Hazard of electricity leakage.
Check if the wiring conforms to the
Malfunction might happen and parts
Check if there is obstruction
blocking the air inlet/outlet.
It may cause deficiency of cooling
Check if the piping length and
refrigeration charging volume has
Uncertain about the refrigerant
charging volume.
Check if the piping connection and
valves have been set properly.
It may cause unit abnormality and
Make sure there is no crack among
air return and supply pipe.
It may cause air leak, vibration and
Check if the panel is mounted securely.
It may cause air leak, vibration and
5.2 Trial Run
5.2.1 Preparative for Trial Run
(1) Never power on the unit until all the installation work has been done.
(2) All the control circuit and wiring has been connected correctly and soundly.
Valves on the gas and liquid line should be completely open.
(3) All the scattered objects should be removed, especially metal filing, thrum and
clip.
(4) Check if the unit appearance and piping system has been damaged during
transportation or handling.
(5) Check if the terminals are loose and the phases are correct.
5.2.2 Trial Run
(1) Trial run can be operated by professional personnel only after above items
have been checked (items to be checked as per actual condition).
(2) Power on the unit and press ON/OFF button to activate.
(3) After compressor start-up, immediately stop the unit if you hear an abnormal
sound.
(4) Trial run under several modes and check if the unit operates normally.
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