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• If the overcurrent protection continuously occurs 6 times, it should not be resumed automatically and you should
press the ON/OFF button to resume. During the process of running, if the running time of compressor exceeds the
[T protection times clearing of overcurrent], the discharge protection is cleared to recount.
8. Voltage Sag Protection
a. After starting the compressor, if the time of DC link voltage sag [U sagging protection voltage] is measured to be less
than T voltage sag protection time the machine should be stopped at once, hand on the voltage sag trouble, reboot
automatically after 30 minutes.
9. Communication Fault
a. When a signal fails to come from the indoor unit within 3 minutes, the machine will stop for a communication fault.
When you have not received a signal from the driver IC (aim the remote controller for the separating of main control IC
and driver IC), and the machine will stop for communication is resumed, the machine will be allowed to operate.
10. Module Protection
a. Testing the module protective signal immediately after started, once the module protective signal is measured, stop
the machine with module protection immediately. If the module protection is resumed, the machine will be allowed to
operate, if the module protection continuously occurs 3 times, it should not be resumed automatically, and you should
press the ON/OFF button to resume. If the running time of compressor exceeds the [T protection time clearing of
module], the module protection is cleared to recount.
11. Module Overheating Protection
a. Starting Estimation
• After the compressor stopped working for 180 seconds, if T module < [T module frequency limited temperature] (the
temperature of hysteresis is 35.6OF), the machine is allowed to start, otherwise it should not be started, and should
be stopped to treat according to the module overheating protection. The machine should be stopped or transferred
to supply air, the trouble should be cleared immediately, and the protection times are not counted.
b. Frequency Limited
• If [T limited frequency temperature of module] ≤ T module < [T frequency reducing temperature at normal speed of
module], you should limit the frequency raising of compressor.
c. Reducing Frequency at Normal Speed and Power Turn-off
• If [T frequency reducing temperature at normal speed of module] ≤ T module < [T frequency reducing temperature
at high speed of module], you should adjust the compressor frequency by reducing 8Hz/90 seconds until the lower
limit. After it was running 90 seconds at the lower limit, if [T frequency reducing temperature at normal speed of
module] ≤ T module, you should stop the machine for module overheating protection.
d. Reducing Frequency at High Speed and Power Turn-off
• If [T frequency reducing temperature at high speed of module] ≤ T module < [T power turn-off temperature of
module], you should adjust the compressor frequency by reducing 30Hz/90 seconds until the lower limit. After it
was running 90 seconds at the lower limit, if [T frequency reducing temperature at normal speed of module] ≤ T
module, you should stop the machine for module overheating protection.
e. Power Turn-off
• If the [T power turn-off temperature of module] ≤ T module, you should stop the machine for module overheating
protection. If T module < [T limited frequency temperature of module] and the compressor has been stopped for 3
minutes, the machine should be allowed to operate.
• If protection continuously occurs 6 times, it should not be resumed automatically, and you should press the ON/OFF
button to resume. During the process of running, if the running time of compressor exceeds the [T protection times
clearing of module], the discharge protection is cleared to recount. Stopped or transferred to supply mode will clear
the trouble times immediately (if the trouble cannot be resumed, mode transferring also will not clear it).
f. Compressor Overloads Protection
• If you measure the compressor overload switch action in 3 seconds, the compressor should be stopped for
overloading. The machine should be allowed to operate protection was measured to resume. If the overloading
protection continuously occurs for three times, it should not be resumed automatically, and you should press the
ON/OFF button to resume. The protection times of compressor is allowed to clear after the compressor run [T
protection times clearing of compressor overloading].
g. Phase Current Overcurrent Protection of Compressor
• During the running process of compressor, you could measure the phase current of the compressor, and control it
according to the following steps:
• Frequency limited – If [I limited frequency phase current] ≤ [I phase current T frequency reducing phase current],
you should limit the frequency raising of compressor.
