MCAC-RTSM-2012-07 M-thermal Technical Manual (part 4)
H. "P2": Low pressure protection
The protection device circuit checks continuity in low pressure switch
1. Faulty low pressure switch
2. Refrigerant is not enough.
3. Refrigerant does not loop smoothly.
4. Efficiency of indoor heat exchange is low.
5. Control board is not defective.
P2: Low pressure protection (R22 refrigerant system protects
at 0.03Mpa, recovers at 0.1MPa; R410 refrigerant system
protects at 0.05MPa, recovers at 0.15MPa, or protects at
0.14MPa, recovers at 0.3MPa).
Refrigerant is not enough or the
system leaks refrigerant.
System's gas side is blocked. Phenomenon
may be discharge temperature is high, low
pressure is low, current is small. These are
caused by closed EXV valve, closed stop valve
Heat exchanger of IDU is inefficient, which
may be caused by the dirty exchanger or
filter, block of air flow, the fan not running
Chip is defective or incorrectly installed. Or
the low pressure sensor is disconnected.
Main control board is defective.
Reinstall the chip or replace it
Replace the main
control board.
Add refrigerant or
fix up the system.
system is block by ice, the
system should also be clean.
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