P5: Condenser Temperature Protection - Midea V5 X VRF Series Technical & Service Manual

MCAC-VTSM-2015-10

4.23 P5: Condenser temperature protection

When condenser temperature is over 65
standby. When the temperature goes back to normal range, P5 protection finishes and normal operation
resumes.
P5: Condenser temperature protection
T3/T5 port on main control board is loose
T3/T5 sensor has short circuited or is disabled*
The indoor load is too large*
Low condenser heat exchange, causes
may include dirty heat exchanger,
abnormal ODU fan operation, too closed
outdoors installation, etc.
The high pressure side of the system is
blocked, caused by crushed or bent pipe,
blocked valve or closed stop valve*
System contains air or nitrogen*
Outdoor main PCB is damaged
Note:
T3/T5: Sensor for condenser pipe;
* How to check for T3/T5 sensor
Using a multi meter to measure resistance, if the resistance is too small, the sensor is short circuit, if the resistance in certain
temperature is not consistent with attached table 1, the sensor is disabled
* The phenomenon of large indoor load
The suction temperature and discharge temperature are both higher than normal value.
* The phenomenon of high pressure side blockage
The high pressure is higher than normal value, the low pressure is lower than normal value, and the discharge temperature is
higher than normal value.
* The phenomenon air or nitrogen in the system
The high pressure is higher than normal value, current is larger than normal value, discharge temperature is higher than normal
value, abnormal compressor noise, pressure meter is not steady.
Troubleshooting
o o
C (149
No
No
No
No
No
No
F), the system will display P5 protection, the ODUs will go on
Yes
Fasten the T3/T5 port
Yes
Yes Make sure the ratio of connectable IDU is
less than 130% or add ODU
Yes
Inspect the system and fix the error
Make sure all valves are open, ensure free
Yes
Flush all refrigerant. Then vacuum the
Yes
system and recharge the refrigerant. Add
oil to the system if it leaks
Replace the outdoor main PCB
R410A All DC Inverter V5 X Series 50Hz
Replace the sensor
refrigerant flow
151