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MULTI V 5 Outdoor Unit Service Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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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.
Low Pressure Sensor High Pressure Sensor
OUTPUT CHARACTERISTICSOUTPUT CHARACTERISTICS
Pressure (psi)
Pressure (psi)
73 145 218 290 393 435
189 363 551 725
914
1,088
High Pressure Sensor : 0~5 MPa (0~725.2 psi)
Vout 0.5~3.5V
Low Pressure Sensor : 0~2 MPa (0~290.1 psi)
Vout 0.5~3.5V
(Red)
(Black)
(White)
±5%
Pressure
Sensor
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 60: Pressure Sensor Output Characteristics.
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.
Figure 61: Pressure Sensor Schematic.
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.
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SENSORS AND OUTDOOR FAN
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