201
Failure code
Outdoor
digital
display tube:
75-0
Indoor wired
controller:
4B
Indoor unit LED status
LED5
Failure description:
Pressure difference between high and low
pressure too low failure
20 times
Outdoor unit LED status
LED1
LED2
Normal
Normal
1. Model
Diagnosis and troubleshooting
MRV 5-RC series
Diagnosis
Troubleshooting
2. Abnormity detection method
◆
Check if the difference
between high and low pressure
of system exceeds 0.4MPa after
start and before failure alarm;
◆
Check if the unit lack of
refrigerant.
◆
Check the four-way valve of
unit for normal switching and
free from backflow.
◆
Check if the detection value
of high/low pressure sensor is
correct.
◆
Check if the unit is beyond
the operation range.
3. Abnormity confirmation
conditions
75-0: Pd-Ps≤0.1Mpa within 1min
upon the INV compressor starts.
75-4: Pd-Ps≤0.4Mpa lasts for
3min.
4. Possible causes
◆
The detection value of
high/low pressure sensor is
incorrect;
◆
The refrigerant in the system
is insufficient;
◆
The four-way valve cannot
be switched normally or with
backflow.
The power module cannot
drive the compressor operating
normally;
◆
The inverter compressor is
with serious inter deterioration,
which makes it difficult to form
difference between high and
low pressure.
◆
The operation environment
is beyond the allowed range.
Check if the high-low pressure
difference of system exceeds 0.4MPa
after start and before failure alarm;
Check if the refrigerant in the system
is with leakage or insufficient.
Check if the detection value of low
pressure sensor is correct.
If the four-way valve of outdoor unit is
with backflow and if the suction pipe
filter of compressor is blocked.
Check if it operates normally
after replacing a normal driver
module.
if the allowed operation range is exceeded.
Use the unit in accordance with
its allowed operation range.
Replace it correctly by after-sales
personnel on site and ensure the
refrigerant is enough.
Rectify it correctly by after-sales
personnel on site.
Check if the corresponding pressure
sensor is intersected with another
compressor, especially for a double
compressor system.
Troubleshoot and replace it correctly
by after-sales personnel on site.
[Note]: Check if the suction pipe
filter of compressor is blocked, when
the discharging temperature rises
obviously.
R e p l a c e t h e d r i v e r m o d u l e
correctly.
Replace the inverter compressor
if the high-low pressure difference
cannot reach 0.4MPa above before
failure alarm.
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Содержание MRV 5-RC VP1-112B
Страница 1: ...MRV 5 RC Service Manual SYJS 03 2019REV A Edition 2019 03 ...
Страница 3: ......
Страница 55: ...52 AV08 10 12 14IMVURA 4 Center of gravity x X 347 9587 y 471 5454 z 725 6683 y z ...
Страница 56: ...53 AV16 18 20 22IMVURA x X 650 5962 y 380 7255 z 706 5342 y z ...
Страница 106: ...103 2 Dimension 4 19 200 60 25 25 25 249 108 232 84 69 388 73 82 65 103 177 4 44 4 35 277 ...
Страница 116: ...113 2 Preparation before installation ...
Страница 130: ...127 2 Dimension 290 67 410 220 567 137 160 189 57 144 109 159 159 212 393 4 22 65 65 65 65 65 44 65 76 4 52 67 156 830 ...
Страница 162: ...159 One by one valve box PCB code 0151800186A 2 Valve box PCB photo and dip switch setting ...
Страница 165: ...162 One by four valve box PCB code 0151800466 ...