8.3 Main Protection
8.3.1 Time delay at restart for compressor.
8.3.2 Fan Speed is out of control. (only for 7k,9k,12,16k,17k,18k(except MSWR1-18CRN1-QB9)
models)
----When Indoor Fan Speed keeps too low or too high for certain time, the unit will stop and the LED
will display the failure
8.3.3 Current protection
A zone: The current exceeds I
3SEC
for 5 seconds(3 seconds for 21k model), the compressor and
outdoor fan will shut off.
B zone: The current exceeds I
5min
for 5 minutes, the compressor and outdoor fan will shut off.
C zone: The current exceeds I
FAN
, the outdoor fan will shut off if AC is in heating mode. If AC is in
cooling mode, the indoor fan will run at low speed.
8.3.4 Zero crossing detection error protection (only for 7k, 9k, 12k,16k, 17k,18k
(MSWR1-18CRN1-QB9) models)
If AC can not detect zero crossing signal for 4 minutes or the zero crossing signal time interval is not
correct, the unit will stop and the LED will display the failure. The correct zero crossing signal time
interval should be between 6-13ms.
8.3.5 Indoor / outdoor units communication protection(only for MSR1-21CRN1-QB8W,
MSR1-21HRN1-QB8W, MSR1-21HRN1-QB4W, MSR1-24CRN1-QB8W,MSR1-24HRN1-QB4W,
MSR1-24HRN1-QB8W models)
If the indoor units can not receive the feedback signal from the outdoor units for 2 minutes, the AC will
stop and display the failure.
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