192
Failure code
Outdoor
digital
display tube:
40
Indoor wired
controller:
28
Indoor unit LED status
LED5
Failure description:
High pressure sensor Pd too high protec-
tion
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 high pressure
acquired by the PCB is
correct;
◆
Check if the voltage
characteristic corresponding
to the pressure sensor is
correct;
◆
Check if the high pressure
side of the system is blocked;
◆
Check the outdoor fan
for normal operation when
cooling.
3. Abnormity confirmation
conditions
The high pressure switch is
turned off for 2s.
4. Possible causes
◆
The pressure sensor is
broken;
◆
The pressure sensor signal
acquired by the PCB is incorrect;
◆
The high pressure side of the
unit is blocked;
◆
The outdoor fan stops
operating when cooling;
◆
The refrigerant is excessive;
◆
It is out of the operating range
of units.
Check if the voltage characteristic of the
corresponding pressure sensor is normal.
Check if the pressure sensor
signal acquisition loop of the
computer board is normal.
Check if the high pressure reaches
4.0MPa upon failure alarm.
Check if the high pressure stop
valve is turned on or the high
pressure side is blocked.
Check the outdoor fan for normal
operation when cooling.
Check if the refrigerant is excessive.
Check if the allowed operation
range is exceeded
Replace it correctly by after-
sales personnel on site.
Replace it correctly by after-
sales personnel on site.
Rectify it correctly by after-sales
personnel on site.
Rectify it correctly by after-sales
personnel on site.
Notify the user to use it within the
operating range of units by after-
sales personnel.
Y
N
Y
Y
Y
N
N
Y
Y
N
Y
Rectify it correctly by after-sales
personnel on site.
Note: confirm if the system
including the noncondensable gas
N
Summary of Contents for MRV 5-RC AB052MAERA
Page 1: ...MRV 5 RC Service Manual SYJS 03 2019REV A Edition 2019 03 ...
Page 3: ......
Page 55: ...52 AV08 10 12 14IMVURA 4 Center of gravity x X 347 9587 y 471 5454 z 725 6683 y z ...
Page 56: ...53 AV16 18 20 22IMVURA x X 650 5962 y 380 7255 z 706 5342 y z ...
Page 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 ...
Page 116: ...113 2 Preparation before installation ...
Page 162: ...159 One by one valve box PCB code 0151800186A 2 Valve box PCB photo and dip switch setting ...
Page 165: ...162 One by four valve box PCB code 0151800466 ...