MCAC-RTSM-2012-01 M-thermal Technical Manual (part 2)
G. "P1": High pressure protection
The protection device circuit checks continuity in high pressure switch
1. Refrigerant is excess.
2. Refrigerant does not loop smoothly.
3. The refrigerant loop contains air.
4. Control board is defective.
P1: High pressure protection (R22 refrigerant system protects
at 3.3Mpa, recovers at 2.4MPa; R410 refrigerant system
protects at 4.4MPa, recovers at 3.2MPa).
Heat exchanging of ODU is not efficient. This may be
caused by dirty heat exchanger, abnormal ODU fan
running, air flow keeping off to the heat exchanger,
ODU are too near to each other.
System's liquid refrigerant loop is blocked.
This may be caused by blocked valve, pressed
tube, closed blocked valve.
Refrigerant is excess. In this circumstance, the
refrigerant's low pressure is high, so is the
high pressure side, while the discharge
System contains air or nitrogen. In this
circumstance, the high pressure is high, the
current is large, the discharge temperature is
high, compressor makes noise
Chip is defective or incorrectly installed. Or
the high pressure sensor is disconnected.
Control board is defective.
Check the system and fixed up
the error.
Check the system and get rid of the
block, and make the loop smooth.
Discharge part of the refrigerant.
Add some oil to the system if it
leaks during the discharge.
Discharge the refrigerant. Then vacuumize the
system and refill the refrigerant. Add oil to the
Reinstall the chip or replace it
with a fine one.
Replace the main control board.
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