GREE ELECTRIC GWH07AGA-K6DNA1A/O Service Manual page 61

VPFC does not open the undervoltage protection valuetime, if the
PFC is turned on, the bus voltage is smaller than the VPFC Open
undervoltage protection value Times Under voltage protection,
under pressure protection, the compressor is closed, and the
PFC is closed, and the compressor will clear the fault sign after 3
minutes.
2. Over-High Voltage Protection for DC Bus
When the compressor is running, if the DC bus voltage is detected
is greater than the VPFC output protection value, the voltage
protection is reported, the stopper, the PFC, and the compressor
will clear the fault flag after 3 minutes.
(14) Abnormity Protection for Four-way Valve
Under the model of heating operation in good condition: the
compressor is detected [T
], during the running, it should be regarded as
For Four-Way Valve Reversion)
four-way valve reversion abnormity. And then it can run if stop the
reversion abnormity protection for four-way valve 3 min; and if it
still can't run when the reversion abnormity protection for four-
way valve happens to stop working for 3 times in succession, it is
available if presses ON/OFF.
Attention: the protection shall be shielded during the testing mode
and defrosting process, and it shall be cleared out the failure and
its times immediately when turning off or delivering wind / cooling /
dehumidifying mode conversed (the inverted mode don't clear out
the failure when it can't recover to operate).
(15) PFC Protection
1. After start up the PFC, it should detect the protection signal of
PFC immediately; under the condition of PFC protection, it should
turn off the PFC and compressor at one time;
2. It shows the failure is cleared out if PFC Protection stopped
working 3 min and recovers to run automatically;
3. If it still can't run when it occurs PFC protection for 3 times in
succession, it is available if presses ON/OFF; and clear the PFC
Protection times when start up PFC for 10min.
(16) Failure Detection for Sensor
1. Outdoor Ambient Sensor: detect the failure of sensor at all times.
2. Outdoor Tube Sensor: You should not detect the failure of
outdoor tube sensor within 10 minutes heating
operation compressor except the defrosting, and you could detect
it at other time.
58
<(T
Inner Tube Inner Ring-T Abnormity Temperature Difference
3. Outdoor Exhaust Sensor:
(a) The compressor only detect the sensor failure after it start up 3
min in normal mode;
(b) It should detect the exhaust sensor failure immediately in the
testing mode.
4. Module Temperature Sensor:
(a) Short-Circuit Detection: the compressor should be detected
immediately when the module temperature sensor occurs short-
circuits;
(b) Open-Circuit Detection: the compressor should be detected on
open-circuit when it runs 3min (it needn't 30s avoiding the module
over-heated).
(c) Detect the sensor failure at all times in the testing mode.
5. Disposal for Sensor Protection
(1) When the short-circuit of sensor is detected within 30s, It is
regarded as the temperature of sensor over-high (or infinitely
high), and now according to the over-high sensor, the machine
should carry out the corresponding protection to stop working,
and show the corresponding temperature shutdown protection
and sensor failure at the same time (for example: the compressor
stops immediately when the outdoor tube sensor short-circuit, and
the machine shall show the overload protection and outdoor tube
sensor failure).
(2) When the open-circuit of sensor is detected within 30s, The
protection shall be stopped and it shall show the corresponding
sensor failure.
6. Electric Heating Function of Chassis
(1) When Toutdoor amb.≤0 , the electric heating of chassis will
operate;
(2) When Toutdoor amb.>2 , the electric heating of chassis will stop
operation;
(3)When 0 <Toutdoor amb.≤2 , the electric heating of chassis will
keep original status.
7. Electric Heating Function of Compressor
(1) When Toutdoor amb.≤≤-5 , compressor stops operation, while
the electric heating of compressor starts operation;
(2) When Toutdoor amb.>-2 , the electric heating of compressor
stops operation;
(3) When -5 <Toutdoor amb.≤-2 , the electric heating of compressor
will keep original status.
Service Manual
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