9
1. Starting Estimation
a. After the compressor stopped working for 180 seconds, if T inner pipe > [T frozen prevention frequency limited
temperature (the temperature of hysteresis is 35.6ºF)], the machine is only allowed to start for operating, otherwise it
should not be started, and should be stopped to treat according to the frozen preventing protection: Clear the trouble
under the mode of power turn-off/heating, and the protection times are not counted.
2. Frequency Limited
a. [T frozen preventing normal speed frequency reducing temperature] ≤ [T inner pipe T frozen preventing frequency
limited temperature], you should limit the frequency raising of compressor.
3. Reducing Frequency at Normal Speed
a. If [T frozen preventing power turn-off temperature] ≤ [T inner pipe T frozen preventing normal speed frequency
reducing temperature], you should adjust the compressor frequency by reducing 8Hz/90 seconds until the lower limit.
4. Reducing frequency at High Speed
a. If [T frozen preventing power turn-off temperature] ≤ T inner pipe [T frozen preventing high speed frequency reducing
temperature] you should adjust the compressor frequency by reducing 30Hz/ 90 seconds until the lower limit.
5. Power Turn-Off
a. If the T inner pipe < [T frozen preventing power turn-off temperature], then frozen preventing protect to stop the
machine. If T [frozen preventing frequency limited temperature] < T inner pipe, and the compressor has stopped
working for 3 minutes, the whole machine should be allowed to operate.
b. If the frozen preventing protection power turn-off continuously occurs for six times, it should not be resumed
automatically and you should press ON/OFF button to resume if the fault keeps on. During the process of running,
if the running time of compressor exceeds the T evaporator frozen preventing protection times zero clearing time,
the times of frozen preventing power turn-off should be cleared to recount. The mode of stopping the machine or
transferring to supply air will clear the trouble times immediately (if the trouble cannot be resumed, mode transferring
will not clear it).
6. Overload Protection Function
a. After the compressor stopped working for 180 seconds, if T outer pipe < [T cooling overload frequency limited
temperature] (the temperature of hysteresis is 35.6ºF), the machine is allowed to start, otherwise it should be started,
and should be stopped to treat according to overload protection. Clear the trouble at the mode of power turn-off /
heating, and the protection times are not counted.
b. If [T cooling overload frequency limited temperature] ≤ [T outer pipe T cooling overload frequency reducing
temperature at normal speed], you should limit the frequency raising of compressor.
c. If [T cooling overload frequency reducing temperature at high speed] ≤ T outer pipe [T cooling overload power turn-off
temperature], you should adjust the compressor frequency by reducing 8Hz/90 seconds until the lower limit. After it
was running 90 second at the lower limit, if [T cooling overload frequency reducing temperature at normal speed] ≤ T
outer pipe, then cooling overload protects machine stopping.
d. If [T cooling overload frequency reducing temperature at high speed] ≤ T outer pipe [T cooling overload power turn-off
temperature], 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 cooling overload frequency reducing temperature at normal speed] ≤
[T outer pipe], then cooling overload protects machine stopping.
e. If the [T cooling overload power turn-off temperature] ≤ T outer pipe, then cooling overload protects machine stopping.
If [T outer pipe] ≤ [T cooling overload frequency limited temperature] and the compressor has been stopped working
for 3 minutes, the machine should be allowed to operate.
f. If the cooling protection overload power turn-off continuously occurs for six times, it should not be resumed
automatically, and you should press the ON/OFF button to resume if the fault keeps on. During the process of
running, if the running time of compressor exceeds the T overload protection times zero clearing time, the times of
overload protection power turn-off should be cleared to recount. The mode of stopping the machine or transferring to
supply air will clear the trouble times immediately (if the trouble cannot be resumed, transferring mode will not clear it).
7. Overload Protection Function in Heating Mode.
a. After the compressor stopped working for 180 seconds, if T inner pipe T heating overload 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 overload protection.
b. Clear the trouble at the mode of power turn-off / heating, and the protection times are not counted.
