Fedders GWH18MC-D3DNA1A/O, Руководство по обслуживанию

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Function and Control
(3) 4-way valve control
1. The 4-way valve control under the modes of Cooling, dehumidification and supplying air: closing;
2. The status of 4-way valve control under the heating mode: getting power;
(1) 4-way valve power control under heating mode
a. Starts the machine under heating mode, the 4-way valve will get power immediately.
(2) 4-way valve power turn-off control under heating mode
a. When you should turn off the power or switch to other mode under heating mode, the power of 4-way
valve will be cut after 2 minutes of the compressor stopped.
b. When all kinds of protection stops, the power of 4-way valve will be cut after delaying 4 minutes.
(3) Defrosting control under heating mode:
a. Defrosting begins: The power of 4-way valve will be cut after 50s of entering into the defrosting
compressor.
b. Defrosting stops: The 4-way valve will get power after 50s of exiting the defrosting compressor.
(4) Evaporator frozen-preventing protection function
At the mode of Cooling, dehumidifying:
Evaporator frozen-preventing protection function is allowed to begin after 6 min of starting the compressor.
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 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.
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;