3-2
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. The following is the items necessary for a pre-trip inspection, but those surrounded with a
frame can receive an automatic PTI.
(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 fasteners
⑥ Condition of each sensor installation
⑦ Loose mounting sections
・ Bolts and nuts ----- Casing frame, compressor, fan motor, control box
・Cable glands ----- Control box
⑧ Conditions of control box cover packing (water-proof)
⑨ Magnetic contactor contact point for burning out
(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
HPS ……Measurement of the actuating pressure
① Safety device by stopping the condenser fan motor
② Control equipment 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
(4) Operation in each mode
① Pull-down → 0℃ Pull-down time, voltage and current
②
Chilled control 0℃ Electronic temperature recorder calibration
Return, supply air temperature differential, voltage and current
③ Defrosting Defrosting time
④ Pull-down → -18℃
Pull-down time, evaporator fan motor speed switchover
⑤
Frozen control -18℃ Electronic temperature recorder calibration
(Difference of temperature, direction of rotation)
⑥
Dehumidification operation and humidity sensor inspection
ON/OFF, voltage and current
Remaining frost inspection
(5) PTI report preparation
●Consumables
①Rechargeable battery: 2 years
②Humidity sensor: Inspect every year. Replace when appropriate.
③
Refrigerant: Inspect at the time of PTI. Replace if an abnormality (malfunction caused by moisture entering, etc.) is detected.
④Power plug: Inspect during PTI. Replace if an abnormality is detected.
⑤Power cable: Inspect during PTI. Replace if an abnormality is detected.
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