191
Failure code
Outdoor
digital
display tube:
39-1
Indoor wired
controller:
27
Indoor unit LED status
LED5
Failure description:
Compressor ratio
ε too high protection
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 operating
compression ratio of system is
above 8 before failure alarm;
◆
Check if the unit lack of
refrigerant.
◆
Check if the pipelines on the
low pressure side or liquid side
are blocked;
◆
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
Alarm to shut down if the
compression ratio ε>8.0 is
detected for continuous 5min
after the compressor operates;
alarm to shut down if the
compression ratio ε>9.0 or
ε>8.5 when cooling or heating
for 1min separately.
4. Possible causes
◆
The detection value of high/
low pressure sensor is incorrect;
◆
The refrigerant in the system
is insufficient or the system is
with air leakage;
◆
The pipelines on the high
pressure side or liquid side of
the unit are blocked;
◆
The outdoor unit cannot be
turned on normally due to failure
to open electronic expansion of
outdoor heat exchanger when
heating;
◆
The operation environment is
beyond the allowed range.
Check if the system operating
compression ratio is above 8
before failure alarm.
Check if the refrigerant in the system
is with leakage or insufficient.
Check if the detection value of high-
low pressure sensor is correct.
Check if the pipelines on the
low pressure side or liquid
side of the unit are blocked.
Check if the allowed operation
range is exceeded.
Use the unit in accordance with
its allowed operation range.
Use the unit in accordance with
its allowed operation range.
Rectify it correctly by after-sales
personnel on site.
Troubleshoot and rectify it correctly
by after-sales personnel on site.
[Note]: Simultaneously, check if all
stop valves can be turned on.
C h e c k i f a l l t h e e l e c t r o n i c
expansion valves of the indoor unit
can be turned on normally.
Y
Y
Y
N
N
Y
N
Y
N
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 ...