Automatic Pti (Pre-Trip Inspection) - Daikin LXE10E-A Service Manual

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3.9.2 Automatic PTI (Pre-Trip Inspection)

● The automatic PTI function is provided so as to ensure correct inspection and to shorten inspection
time. (Refer to section 3.2 for operation of controller)
(1) Appearance inspection of unit
q Physical damage
Casing insulation through hole area
w
Drain hose (dust and clogging)
e
r Power cable and plug damage
Condition of refrigerant piping fasteners.
t
Condition of each sensor installation
y
u Loose mounting sections
Bolts and nuts ----- Casing frame, compressor, fan motor control box and temperature recorder box
Cable glands ----- Control box
Conditions of control box cover packing (water-proof) and temperature recorder box cover packing
i
(water-proof)
Magnetic contactor contact point for burning out.
o
(2) Inspection before unit operation
Gas leakage inspection
q
Power voltage inspection
w
(3) Operation inspection of safety device and control equipment
Safety device
q
Control equipment Solenoid valve
w
(4) Operation in each mode
Pull-down /
q
Chilled control
w
Defrosting
e
Pull-down /
r
Frozen control
t
(5) PTI report preparation
HPS ----- Measurement of the actuating pressure by stopping the condenser
fan motor.
EFM
EV, SMV
0˚C
0˚C Electronic temperature Return, supply air temperature differential, voltage and current
recorder calibration
–18˚C
–18˚C Electronic temperature (Temperature differential and rotating direction)
recorder calibration ON/OFF, voltage and current
----- Inspection of operation (open and close) and leakage
----- Speed switchover and rotating direction
----- Inspection of operation (open and close) and leakage
Pull-down time, voltage and current
Defrosting time
Pull-down time, evaporator fan motor speed switchover
Remained frost inspection
3-54
(Automatic PTI range)