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Penyelesaian Masalah Menggunakan Remote Kontrol
Si341213
Diagnosis Servis
134
PERIKSA 2
Pemeriksaan untuk Penyebab Turunnya Tekanan Rendah
Mengacu pada Analisis Pohon Kesalahan/Fault Tree Analysis (FTA) yang ditunjukkan di
bawah, menyelidiki titik yang rusak.
[In cooling]
(See
1.) Defective
Are the electrical characteristics normal?
Abnormally low
low-pressure (Low
evaporating
temperature)
Defective low
pressure
control
[In both cooling
and heating]
(See
2.)
[In cooling]
If the katup ekspansi
elektronik unit indoor is
excessively throttled: (See
3.)
Defective
katup
ekspansi
elektronik
control
[In cooling]
Low suction
air
temperature
of the
evaporator
compressor
capacity
control
Defective low
pressure
Kendali
Perlindungan
Defective katup
ekspansi
elektronik unit
indoor
Defective
control
Low suction air
temperature of
indoor unit
Defective control PCB
Defective sensor tekanan
rendah Defective hot gas katup
solenoid Defective control
PCB
Defective valve coil
Defective valve body
Defective gas pipe
termistor of indoor unit
Defective pipa cairan
termistor of indoor unit
Defective control PCB
Short circuit
Low outdoor air temperature
Is the pressure value checked with the Service Checker
corresponding to the measurement of the pressure sensor?
Are the electrical characteristics normal?
Are the coil resistance and insulation normal?
Is the pressure value checked with the Service Checker
corresponding to the measurement of the pressure sensor?
Are the coil resistance and insulation normal?
Check for the termistor resistance and connection.
Check for the termistor resistance and connection.
Is the pressure value checked with the Service Checker
corresponding to the measurement of the pressure sensor?
Is the suction air temperature not less than 14°C
Is the indoor temperature not more than 14°C
Defective suction air termistor of indoor unit
Is the connector properly connected?
Are the termistor resistance characteristics normal?
Less
circulation
High pipe
resistance
Abnormal piping length
Bent or crashed pipe
Clogging of foreign particles
Stop valve closed
Does the piping length fall in the permissible range?
Conduct visual checks for pipe conditions.
Is there any temperature difference caused
before and after the filter or branch pipe?
Check to be sure the stop valve is open.
quantity of
refrigeran
Degradation
in condensing
capacity
Inadequate refrigeran quantity
Moisture choke
Dirty evaporator
Decreased
fan output
Eliminate moisture by vacuum operation.
Is the penukar panas clogged?
Can the fan motor be rotated with hands?
Are the motor coil resistance and insulation normal?
Decreased
fan airflow
rate
High air
passage
resistance
Defective control PCB
(Including capacity setting)
Dirty filter
Obstacle
If a spare PCB is mounted, is the
capacity setting properly made?
Is the air filter clogged?
Is there any obstacle in the air passage?
Catatan:
1. For details of the compressor capacity control while in cooling, refer to
“Compressor PI
Control”.
2. The “low pressure Kendali Perlindungan” includes low pressure Kendali Perlindungan and
hot gas bypass control.
3. In cooling, the katup ekspansi elektronik unit indoor is used for
“superheated degree control”.
Defective low pressure sensor
Defective fan motor