Gree Dettson LOMO 19 Installation Manual page 45

the machine can be restarted after remote shutdown and powering
up again without delay).
1. Cooling mode
Start the machine to enter into cooling operation for cooling, the
compressor is switched on.
2. Dehumidifying mode
Same as the cooling mode.
3. Air-supplying mode
The compressor is switched off.
4. Heating mode
(1) Start the machine to enter into heating operation for heating,
the compressor is switched on.
(2) Defrosting:
a. Defrosting starts: the compressor is shut down, and restarts it
after 55-second delay.
b. Defrosting ends: the compressor stops, then starts it after
55-second delay.
(2) Outer Fans Control
Notes:
Only the outer fans run for at least 80s in each air flow speed can
the air flow be switched;
After the outer fans run compulsively in high speed for 80s when
the machine starts up, control the air flow according to the logic.
After remote shutdown, safety stops, and when the machine
stops after reaching the temperature point, as well as after the
compressor stops, extend 1 minute, the outer fans will stop
(During the period in the 1 minute, the air flow of outer fans can be
changed according to the outdoor ambient temperature changes);
When running with force, the outdoor fans shall run in the highest
air flow.
(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
42
begin after 6 min of starting the compressor.
1. Starting estimation:
After the compressor stopped working for 180s, if T
[T
frozen-preventing frequency-limited temperature
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
[T
frozen-preventing normal speed frequency-reducing temperature
preventing frequency-limited temperature
raising of compressor.
3. Reducing frequency at normal speed:
If [T
frozen-preventing high speed frequency-reducing temperature
preventing normal speed frequency-reducing temperature
compressor frequency by reducing 8Hz/90s till the lower limit;
4. Reducing frequency at high speed:
If [T
frozen-preventing power turn-off temperature
] you should adjust the compressor
speed frequency-reducing temperature
frequency by reducing 30Hz/90s till the lower limit;
5. Power turn-off:
If the T <[T
inner pipe frozen-preventing power turn-off temperature
preventing protect to stop the machine; If T[
] <T , and the compressor has stopped
limited temperature inner pipe
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
<[T
Cooling overload frequency-limited temperature
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: 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
frequency reducing temperature at normal speed
raising of compressor.
3. Reducing frequency at normal speed and power turn-off:
If [T
Cooling overload frequency reducing temperature at high speed
Service Manual
inner pipe
(the temperature of hysteresis
] ≤[T
inner pipe T frozen-
] , you should limit the frequency
] ≤[T
inner pipe T frozen-
], you should adjust the
] ≤T [T
inner pipe frozen-preventing high
], then frozen-
frozen-preventing frequency-
outer pipe
] (the temperature of hysteresis
] ≤[T
outer pipe T Cooling overload
], you should limit the frequency
] ≤T < [T
outer pipe
Technical Information
>
Cooling