4. Inverter Protection Control
Inverter protection control includes protection against abnormal overcurrent drawn by the invertor and abnormal increase of the
inverter module heat exchanger fin temperature.
a. Inverter Overcurrent Protection Control
If CF > 82Hz and CA ≥ A, the compressor operates down to 82Hz. After 3 minutes, if CA < A’, the compressor operates normally.
If 72Hz < CF ≤ 82Hz and CA ≥ B, the compressor operates down to 72Hz. After 3 minutes, if CA < B’, the compressor operates
normally.
If 62Hz < CF ≤ 72Hz and CA ≥ C, the compressor operates down to 62Hz. After 3 minutes, if CA < C’, the compressor operates
normally.
If 48Hz < CF ≤ 62Hz and CA ≥ D, the compressor operates down to 48Hz. After 3 minutes, if CA < D’, the compressor operates
normally.
If CA ≥ E, the compressor operates down to 48Hz.
If CA ≥ F, the outdoor unit stops and displays error code “P3”
Model A A’ B B’ C C’ D D’ E F
MV5-H072~120DXN1 33A 30A 32A 29A 30A 25A 27A 24A 33.5A 35A
MV5-H144DXN1(INV) 31A 29A 30A 27A 28A 24A 25A 22A 31.5A 35A
MV5-H144DXN1(INV1) 20A 18A 18A 16A 17A 15A 16A 14A 20.5A 22A
MV5-H072~120DZN1 18A 15A 17A 14A 16A 13A 15A 12A 18.5A 21A
MV5-H144DZN1(INV) 16A 13A 15A 12A 14A 11A 13A 10A 16.5A 19A
MV5-H144DZN1(INV1) 11A 9A 9A 7A 8A 6.5A 7A 5.5A 11.5A 14A
NOTES:
CF is the operating rotational speed (Hz) of inverter compressor.
CA is the operating current of inverter compressor.
b. Inverter Fin Temperature Control
If Tfin ≥ 172.5⁰F: 4Hz / 2 minutes down from current compressor frequency.
If fin ≥ 167⁰F: 2Hz / 2 minutes down from current compressor frequency.
If Tfin < 163.5⁰F continues for 3 minutes or more: 2Hz / 2 minutes up from current compressor frequency is allowed.
If 163.5⁰F ≤ Tfin < 167⁰F: increase in compressor frequency is not allowed.
If Tfin > 174⁰F outdoor unit stop, the error code “ PL ” is displayed
.
NOTE: Tfin is the temperature of inverter module heat exchanger fin.
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