Gree GWH07QA-K6DNC4A Service Manual page 79

Service Manual
Outdoor Unit(18/24K)
●
1. Input Parameter Compensation and Calibration
(1) Check the ambient temperature compensation
function Indoor ambient temperature compensation
function.
a. In cooling mode, the indoor ambient temperature participating
in computing control = (T
)
temperature compensation
b. In heating mode, the indoor ambient temperature participating
in computing control= (T
)
temperature compensation
(2) Check effective judgment controls of parameters
Effective judgment function of the outdoor exhaust temperature
thermo-bulb When conditions a and b are satisfied, the outdoor
exhaust temperature thermo-bulb is judged not to be connected
into place, the mainboard of outer units will display failure of the
outdoor exhaust temperature thermo-bulb (not connected into
place), stop the machine for repairing, and resume the machine
by remote controls of ON/OFF.
a. Judgment of exhaust detection temperature change:
After the compressor starts up and runs for 10 minutes, if the
compressor frequency f ≥ 40Hz, and the rising value Texhaust
(T
exhaust (after start-up for 10 minutes)
outdoor exhaust temperature thermo-bulb can be judged not to be
connected into place (judging once when the power is on the first
time).
b. Comparative judgment of exhaust detection temperature and
condenser detection temperature (T
, T
temperature in cooling mode pipe temperature
After the compressor starts up and runs for 10 minutes, if the
compressor frequency f ≥ 40Hz, and T
the outdoor exhaust temperature thermobulb can be judged not to
be connected into place (judging once when power is on the first
time).
2. Basic Functions
(1) Cooling Mode
1. Conditions and processes of cooling operation:
(1) If the compressor is shut down, and [T
– ⊿ T
temperature cooling indoor ambient temperature compensation)
up the machine for cooling, the cooling operation will start;
(2) During operations of cooling, if 0ºC ≤ [T
– ⊿ T
temperature cooling indoor ambient temperature compensation)
cooling operation will be still running;
(3) During operations of cooling, if 2ºC ≤ [T
– ⊿ T
temperature cooling indoor ambient temperature compensation)
operation will stop after reaching the temperature point.
2. Temperature setting range
(1) If T
outdoor ambient temperature
the temperature can be set at: 16~30ºC (Cooling at room
temperature);
(2) If T
outdoor ambient temperature
temperature can be set at: 25~30ºC (Cooling at low temperature),
Installation and Maintenance
– ⊿ T
indoor ambient temperature cooling indoor ambient
– ⊿ T
indoor ambient temperature heating indoor ambient
- T ) < 2ºC , the
exhaust (before start-up)
= T
pipe temperature outdoor pipe
= T
indoor pipe temperature in heating mode
≥(T
pipe temperature
– (T
set up
] ≤ 0.5ºC, start
– (T
set up
– (T
set up
], the cooling
≥ [T
low-temperature cooling temperature
< [T
low-temperature cooling temperature
that is, the minimum setting temperature for outer units judgment
is 25ºC .
(2) Dehumidifying Mode
1. Conditions and processes of dehumidifying operations: Same
as the cooling mode;
2. The temperature setting range is: 16~30ºC ;
(3) Air-supplying Mode
1. The compressor, outdoor fans and four-way valves are switched
off;
2. The temperature setting range is: 16~30ºC.
(4) Heating Mode
1. Conditions and processes of heating operations: (Tindoor
ambient temperature is the actual detection temperature of indoor
environment thermo-bulb, Theating indoor ambient temperature
compensation is the indoor ambient temperature compensation
during heating operations)
(1) If the compressor is shut down, and [(T
⊿ T
heating indoor ambient temperature compensation
machine to enter into heating operations for heating;
(2) During operations of heating, if 0ºC ≤ [(T
– ⊿ T
heating indoor ambient temperature compensation
heating operation will be still running;
(3) During operations of heating, if 2ºC ≤ [(T
– ⊿ T
heating indoor ambient temperature compensation
operation will stop after reaching the temperature point.
2. The temperature setting range in this mode is: 16~30ºC .
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.
exhaust+3
② Conditions of finishing defrosting
The defrosting operation can exit when any of the conditions
below is satisfied:
③ T
outdoor pipe temperature
finishing defrosting
④ The continuous running time of defrosting reaches [tmax.
defrosting time].
indoor ambient
4. Control Logic
(1) Compressor Control
indoor ambient Start the compressor after starting cooling, heating, dehumidifying
] < 2ºC, the
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
indoor ambient
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
], the
(Note: The indoor units have a function of power memory, the
machine can be restarted after remote shutdown and powering up
) –T
≥ (T
outdoor ambient temperature
];
–
indoor ambient temperature
] ≤ 0.5ºC, start the
set up
indoor ambient temperature
) –T ] < 2ºC, the
set up
indoor ambient temperature
) –T ], the heating
set up
– [T
temperature 1 of
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