Gree GWH18QD-K3DNA1G - Protection Functions

31
Technical Information
Service Manual
1. Starting estimation:
After the compressor stopped working for 180s, if T
inner pipe
>[T
frozen-preventing frequency-limited temperature
(the temperature of hysteresis is 2 )], 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
[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:
If [T
frozen-preventing high speed frequency-reducing temperature
]≤T
inner pipe
[T
frozen-preventing normal speed frequency-reducing temperature
], you should adjust the compressor
frequency by reducing 8Hz/90s till the lower limit;
4. Reducing frequency at high speed:
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/90s till the lower limit;
5. Power turn-off:
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.
6. If the frozen-preventing protection 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
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 can not be resumed,
mode transferring will not clear it).
(5) Overload protection function
Overload protection function at the mode of cooling and dehumidifying
1. Starting estimation:
After the compressor stopped working for 180s, if T
outer pipe
<[T
Cooling overload frequency-limited temperature
] (the temperature of hysteresis is 2ºC ), the
machine is allowed to start, otherwise it should not be started, and should be stopped to treat according to the overload protection: Clear the
trouble at the mode of power turn-off / heating, and the protection times are not counted.
2. Frequency limited
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.
3. Reducing frequency at normal speed and power turn-off:
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/90s till the lower limit; After it was running 90s at the lower limit, if [T
Cooling overload frequency reducing temperature at normal speed
]≤T
outer pipe
,
then Cooling overload protects machine stopping;
4. Reducing frequency at high speed and stop machine:
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/90s till the lower limit; After it was running 90s at the lower limit, if [T
Cooling overload frequency reducing temperature at normal speed
] ≤[T
outer pipe
],
then Cooling overload protects machine stopping;
5. Power turn-off:
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.
6. If the Cooling overload protection 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 can not be resumed, transferring
mode will not clear it).
Overload protection function at the mode of heating
Starting estimation :
After the compressor stopped working for 180s, if T inner pipe T heating overload frequency-limited temperature (the temperature of
hysteresis is 2 ), the machine is allowed to start, otherwise it should not be started, and should be stopped to treat according to the overload
protection:
Clear the trouble at the mode of power turn-off / heating, and the protection times are not counted.