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3.1 Pre-Trip Inspection
Perform a pre-trip inspection of each component and take remedial actions if necessary so that the unit will
operate normally. Pre trip inspection includes items are listed below.
(1) Appearance inspection of unit
① Physical damage
② Casing insulation through penetration
③ Drain hose (dust and clogging)
④ Power cable and plug damage
⑤ Condition of refrigerant piping cramp
⑥ Condition of each sensor installation
⑦ Loose mounting sections
・ Bolts and nuts ----- Casing frame, compressor, fan motor, control box, inverter box
・Cable glands ----- Control box
⑧ Conditions of control box cover packing (water-proof)
⑨ Magnetic contactor contact point
⑩ Condition of Inverter box cover packing (water-proof)
(2) Inspection before unit operation
① Refrigerant leakage inspection
② Power voltage inspection (Automatic PTI range)
(3) Operation inspection of safety
device and control equipment
① Safety device
② Control equipment
(4) Operation in each mode
① Pull-down → 0℃
② Chilled control 0℃ Electronic temperature recorder calibration Return, supply air temperature differential, voltage and current
③ Defrosting
④ Pull-down → -18℃
⑤ Frozen control -18℃ Electronic temperature recorder calibration
⑥ Dehumidification operation and humidity sensor inspection
(5) PTI report preparation
●Consumables
①Wake-up battery: 2 years
②Humidity sensor: Inspect every year. Replace when appropriate.
③ Refrigerant: Inspect at PTI. Repair as needed. (malfunction caused by moisture entering etc.)
④Power plug: Inspect during PTI. Repair as needed.
⑤Power cable: Inspect during PTI. Repair as needed.
HPS
......Check for proper activation of switch when high pressure
Solenoid valve
......Inspection of operation (open and close) and leakage
EFM
......Speed switchover and rotating direction
EEV, EMV, DMV
......Inspection of operation (open and close) and leakage
3-2
is raised by stopping the condenser fan motor.
Pull-down time, voltage and current
Defrosting time
Pull-down time, evaporator fan motor speed switchover
(Temperature difference and rotating direction)
voltage and current
Remaining frost inspection
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