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Temperature Sensor; Pressure(High/Low) Sensor - LG MULTI V 5 Manual Book

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9. Temperature Sensor

1. Check the condition of installation and the contact of temperature sensor.
2. Check whether the connector contact of temperature sensor is normal.
3. Measure the resistance of temperature sensor.
TH1
10KΩ±1%(25℃)
Resistance
1.07KΩ±3.3%(85℃)
* TH1 : Outdoor temperature sensor
* TH2 : Pipe temperature sensor
* TH3 : Discharge pipe(D-pipe) temperature sensor
■ Checking Method (Flow Chart)
Checking start
After power supplied,
No
1. Check the connector location
the temperature on LGMV
and the connecting direction
is normal before
2. Check the contact failure
operating?
Yes
The output is normal?
No malfunction of temperature
Replace the temperature sensor
sensor
172
_TROUBLE SHOOTING GUIDE BOOK
TH2
TH3
5KΩ±1%(25℃)
200KΩ±1%(25℃)
535KΩ±3.3%(85℃)
28KΩ±7.7%(85℃)
Yes
PCB checking and replacement
No

10. Pressure(High/Low) Sensor

Connect manifold gauge to the service valve of outdoor unit, and compare the output of high pressure
sensor to the output of low pressure sensor to detect the defect.
2.8 Pressure Sensor(High/Low Pressure Sensor)
below) Compare the output of pressure sensor to the output of manifold gauge pressure using the table
below.
Connect manifold gauge to the service valve of outdoor unit, and compare the output of high pressure sensor to
Read the pressure clearly between black and white as the composition of pressure sensor.
2.8 Pressure Sensor(High/Low Pressure Sensor)
the output of low pressure sensor to detect the defect.
below) Compare the output of pressure sensor to the output of manifold gauge pressure using the table below.
Connect manifold gauge to the service valve of outdoor unit, and compare the output of high pressure sensor to
Read the pressure clearly between black and white as the composition of pressure sensor.
the output of low pressure sensor to detect the defect.
<Low Pressure Sensor>
<Low Pressure Sensor>
below) Compare the output of pressure sensor to the output of manifold gauge pressure using the table below.
Read the pressure clearly between black and white as the composition of pressure sensor.
OUTPUT CHARACTERISTICS
<Low Pressure Sensor>
OUTPUT CHARACTERISTICS
1) If the pressure of manifold gauge is 0~1kg/cm
, it indicates the pressure got lower due to the leakage of refriger-
2
1) If the pressure of manifold gauge is 0~1kg/cm
ant. Find the place of leakage and fix it.
age of refrigerant. Find the place of leakage and fix it.
2) If the difference of the outputs of high and low pressure is in the range of 1kg/cm
2) If the difference of the outputs of high and low pressure is in the range of 1kg/cm2, the pressure
1) If the pressure of manifold gauge is 0~1kg/cm
, it indicates the pressure got lower due to the leakage of refriger-
2
3) If the difference of the outputs of high and low pressure is over 1kg/cm
sensor is normal.
ant. Find the place of leakage and fix it.
need to be replaced.
3) If the difference of the outputs of high and low pressure is over 1kg/cm2, the pressure sensor is out
2) If the difference of the outputs of high and low pressure is in the range of 1kg/cm
4) The composition of pressure sensor
of order, it need to be replaced.
3) If the difference of the outputs of high and low pressure is over 1kg/cm
need to be replaced.
4) The composition of pressure sensor
High Pressure Sensor : 0~5MPa
Pressure
4) The composition of pressure sensor
Vout 0.5~3.5V
sensor
Low Pressure Sensor : 0~2MPa
Vout 0.5~3.5V
High Pressure Sensor : 0~5MPa
(Red)
Pressure
Vout 0.5~3.5V
±5%
sensor
Low Pressure Sensor : 0~2MPa
(White)
Vout 0.5~3.5V
(Black)
(Red)
±5%
(White)
The pressure sensor is composed like the circuit picture shown above. If DC 5V voltage flows on red and black
(Black)
wire, voltage would be made between the white and black wire. The pressure which is equivalent to the pressure
output is shown in the table above.
The pressure sensor is composed like the circuit picture shown above. If DC 5V voltage flows on red and black
The pressure sensor is composed like the circuit picture shown above. If DC 5V voltage flows on red
wire, voltage would be made between the white and black wire. The pressure which is equivalent to the pressure
2.9 Outdoor Fan
and black wire, voltage would be made between the white and black wire. The pressure which is
output is shown in the table above.
equivalent to the pressure output is shown in the table above.
1) The outdoor fan is controlled by the inverter motor which can control the number of rotations.
2.9 Outdoor Fan
2) The outdoor fan is controlled by the high/low pressure of the outdoor unit after the operation of compressor.
3) There is possibility that the outdoor fan does not operate due to low capacity operation or low outdoor tempera-
1) The outdoor fan is controlled by the inverter motor which can control the number of rotations.
ture even if the compressor is operating. This does not mean breakdown of the unit, the fan will start operating if
2) The outdoor fan is controlled by the high/low pressure of the outdoor unit after the operation of compressor.
it reaches the set point.
3) There is possibility that the outdoor fan does not operate due to low capacity operation or low outdoor tempera-
ture even if the compressor is operating. This does not mean breakdown of the unit, the fan will start operating if
it reaches the set point.
Copyright ©2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Copyright ©2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Checking Method for Key Components
Checking Method for Key Components
<High Pressure Sensor>
<High Pressure Sensor>
OUTPUT CHARACTERISTICS
<High Pressure Sensor>
OUTPUT CHARACTERISTICS
2
, it indicates the pressure got lower due to the leak-
, the pressure sensor is normal.
2
, the pressure sensor is out of order, it
2
, the pressure sensor is normal.
2
, the pressure sensor is out of order, it
2
- 67 -
LGE Internal Use Only
- 67 -
173
LGE Internal Use Only
_
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