Gree GWH07AWAXA-K6DNA1C

74
Technical Information
Service Manual
enter into heating operations for heating;
(2) During operations of heating, if 0°C ≤ [(T
indoor ambient temperature
–
T
heating indoor ambient temperature compensation
) –T
setup
] < 2°C, the heating
operation will be still running;
(3) During operations of heating, if 2ºC ≤ [(T
indoor ambient temperature
–
T
heating indoor ambient temperature compensation
) –T
setup
], the heating operation will
stop after reaching the temperature point.
2. The temperature setting range in this mode is: 16~30°C .
3. Special Functions
Defrosting Control
①
Conditions for starting defrosting
After the time for defrosting is judged to be satisfied, if the
temperature for defrosting is satisfied after detections for
continuous 3minutes, the defrosting operation will start.
②
Conditions of nishing defrosting
The defrosting operation can exit when any of the conditions below
is satised:
③
T
outdoor pipe temperature
≥ (T
outdoor ambient temperature
– [T
temperature 1 of nishing defrosting
];
④
The continuous running time of defrosting reaches [t
max. defrosting
time
].
4. Control Logic
(1) Compressor Control
Start the compressor after starting cooling, heating, dehumidifying
operations, and the outer fans start for 5s; When the machine is
shutdown, in safety stops and when switching to air-supplying
mode, the compressor will stop immediately. In all modes: once
the compressor starts up, it will not be allowed to stop until having
run for the [tmin. compressor running time] (Note: including cases
of shutdown when the temperature point is reached; except the
cases requiring stopping the compressor such as fault protection,
remote shutdown, mode switching etc.); In all modes: once the
compressor stops, it will be allowed be restart after 3-minute delay
(Note: The indoor units have a function of power memory, 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 ow speed can
the air ow be switched;
After the outer fans run compulsively in high speed for 80s when
the machine starts up, control the air ow 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 ow 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 ow.
(3) 4-way valve control
1. The 4-way valve control under the modes of Cooling,
dehumidication 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) Evaporatorrozen-preventing protection function
1. Starting estimation:
When the indoor unit is running 6 minutes (the compressor
is turned on), the T
inner pipe
≤[T
frozen-preventing stop
(the temperature of
hysteresis is 2 )] is detected in 3 minutes., then enter the frozen-
preventing protection.
2. Frequency limited
When the indoor unit enters frozen-preventing protection,
according to cooling reaches temperature point stop.
(5) Compressor overloads protection
If you measure the compressor overload switch action in 3s, the
compressor should be stopped for overloading. The machine
should be allowed to operate after overload 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
] 30 minutes.
(6) Communication fault
When you have not received any correct signal from the inner