P2, H5: Suction Pipe Low Pressure Protection - Midea V6-i Series Service Manual

2.17 P2, H5: Suction pipe low pressure protection

2.17.1 Digital display output
2.17.2 Description
 Suction pipe low pressure protection. If the system has a 3-phase protector and the 3-phase protector is connected to
the low pressure switch, the system will display P2 protection when initially powered on, and P2 protection will
disappear once the system reaches a steady state.
 All units stop running.
 Error code is only displayed on the unit with the error.
2.17.3 Trigger / recover condition
 Trigger condition:
For P2 protection: Suction pressure ≤ 0.05MPa.
For H5 protection: P2 protection appears three times in 60 minutes.
 Recover condition: Suction pressure ≥ 0.15MPa.
 Reset method:
For P2 protection: Resume automatically.
For H5 protection: Manually restart.
2.17.4 Possible causes
 Outdoor unit stop valves are closed.
 Insufficient refrigerant.
 Low pressure side blockage.
 Poor evaporator heat exchange.
 Main PCB damaged.
V6-i VRF 50/60Hz
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