MCAC-VTSM-2015-10 R410A All DC Inverter V5 X Series 50Hz
Troubleshooting 149
value, abnormal compressor noise, pressure meter is not steady.
* For normal system running parameters please refer to attached table 3.
* If the system has a three-phase protector, and the three-phase protector is connected with the high pressure switch in series,
the system will display P1 protection when initially powered on, and P1 protection will disappear after system is steady.
* If the system has a three-phase protector, and the three-phase protector is connected with the low pressure switch in series, the
system will display P2 protection when initially powered on, and P2 protection will disappear after system is steady.
4.20 P2: Low pressure protection
4.21 H5: P2 protection appears three times in 60 minutes
When the pressure is lower than 0.05MPa, the system will display P2 protection, the ODUs will be on standby.
When the pressure is higher than 0.15MPa, P2 protection finished and normal operation resumes.
H5 error will display when P2 protection appears 3 times in 60 minutes. In this case the system cannot
automatically reset and must be manually restarted.
Note:
* The phenomenon of insufficient refrigerant
Top temperature and discharge temperature of all compressors are higher than normal value, discharge pressure and suction
pressure are both lower than normal value, current is lower than normal value, suction pipe may be frosting. All the phenomenon
will disappear after recharging refrigerant.
* The phenomenon of low pressure side blockage
The discharge temperature is higher than normal value*, low pressure is lower than normal value*, current is lower than normal
value* and suction pipe may be frosting.
* For normal system running parameters please refer to attached table 3.
* If the system has a three-phase protector, and the three-phase protector is connected with high pressure switch in series, the
system will display P1 protection when initially powered on, and P1 protection will disappear after system is steady.
* If the system has a three-phase protector, and the three-phase protector is connected with low pressure switch in series, the
system will display P2 protection when initially powered on, and P2 protection will disappear after system is steady.
Outdoor main PCB is damaged
Replace the outdoor main PCB
P2/H5: Low pressure protection
Insufficient refrigerant caused by
insufficient recharge or refrigerant
Add refrigerant or inspect the system for
leaks
The low pressure side is blocked,
caused by crushed or bent pipe,
closed EXV, closed stop valve, dirty
filter, etc.*
Make sure all valves are open, clean the
filter, if the filter is blocked by ice, the
Low evaporator heat exchange,
caused by dirty heat exchanger,
abnormal IDU fan operation, barrier
in front of the air outlet, etc.
Inspect the system and fix the error
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