Sensors And Outdoor Fan; Checking The High / Low Pressure Sensors; Checking The Outdoor Fan - LG Multi V5 Service Manual

SENSORS AND OUTDOOR FAN

Connect the manifold gauge to the outdoor unit service valve, and compare the high pressure sensor output to the low pressure sensor
output to check for errors.
Figure 60: Pressure Sensor Output Characteristics.
Low Pressure Sensor
OUTPUT CHARACTERISTICS
73 145
1. If the manifold gauge pressure reads 14.22 psi, it indicates the pressure dropped due to a refrigerant leak. Find the leak and repair it.
2. If the difference between the high and low pressure outputs is around 14.22 psi, the pressure sensor is normal.
3. If the difference between the high and low pressure outputs is >14.22 psi, the pressure sensor is damaged and needs to be replaced.
Figure 61: Pressure Sensor Schematic.
High Pressure Sensor : 0~5 MPa (0~725.2 psi)
Pressure
Sensor
Low Pressure Sensor : 0~2 MPa (0~290.1 psi)
(Red)

Checking the Outdoor Fan

1. The inverter motor controls the number of rotations on the outdoor unit fan.
2. The high / low pressure sensors control the outdoor unit fan after compressor operation.
3. Even if the compressor is on, the outdoor unit fan may not operate due to low capacity, or if the outdoor temperature is low. This is nor-
mal, and the outdoor unit fan will begin to operate when the system reaches setpoint.
122
218 290 393
Pressure (psi)
Vout 0.5~3.5V
Vout 0.5~3.5V
±5%
(White)
(Black)
Due to our policy of continuous product innovation, some specifications may change without notification.
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189
435
See the pressure sensor schematic at left. DC 5V will to be mea-
sured between red and black wires. DC voltage measured between
white and Black wire corresponds to charts above.
High Pressure Sensor
OUTPUT CHARACTERISTICS
363 551 725
Pressure (psi)
914
1,088