V. Protection Control
1. High Pressure Protection Control
This high pressure protection control is used to protect the compressor from abnormal increase of high pressure in the system.
When Pc > 566 psi, outdoor unit will stop and the error code “P1” is displayed
.
Figure 31 - Cooling Operation
INV INV1
Figure 32 - Heating Operation
2. Low Pressure Protection Control
When Pe < 7.25 psi, outdoor unit will stop and the error code “P2” is displayed
.
3. Discharge Pipe Protection Control
This discharge pipe protection control is used to protect the compressor from abnormal increase of discharge temperature. When
the discharge temperature > 248⁰F, the outdoor unit will stop and the error code “P4” is displayed
.
NOTE:
Each compressor has its own discharge pipe temperature protection control and operates individually in the following sequence.
Figure 33 - Cooling Operation Figure 34 - Heating Operation
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