81
Installation and Maintenance
Service Manual
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
it's 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).
(16) 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.
(17) 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.
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 neednt 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 T
outdoor amb.
≤0ºC, the electric heating of chassis will
operate;
(2) When T
outdoor amb.
>2ºC, the electric heating of chassis will stop
operation;
4. If the overcurrent protection of compressor phase current
continuously occurs for six times, it should not be resumed
automatically, and you should press the ON/OFF button to
resume. During the process of running, if the running time of
compressor exceeds the [t
Clearing Time of Compressor Phase Current Times
] , the
overcurrent protection is cleared to recount.
(12) Starting-up Failure Protection for Compressor
Stop the compressor after it's starting-up fails, restart it after 20s if
the fault doesn't shows, and if they are all failing for the successive
start 3 times, it shall be reported as Starting-up Failure, and then
restart up it after 3 min. When it still not be able to operate through
carry out the above process for 5 times, it is available if press ON/
OFF. And the compressor should be cleared the times after it run
2 min.
(13) Out-of-Step Protection for Compressor
The out-of-step protection signal should be detected immediately
after starting-up compressor, and once find the out-of-step
protection signal, the out-of-step protection shall be stopped; if
it can run for lasting power turn-off 3 min, the machine shall be
allowed to operate. If it still can't run automatically when the out-
of-step protection for compressor happens to stop working for 6
times in succession, it needs to press ON/OFF to operate. And if
the running time is more than 10 min, the power turn-off times for
out-of-step protection shall be cleared and recounted.
(14) Voltage Abnormity Protection for DC Bus
To detect voltage abnormity protection for dc bus after completing
the pre-charge:
1.Over-High Voltage Protection for DC Bus:
If it found the DCbus voltage U
DC
>[U
DC Jiekuangchun Protection
], turn off
PFC and stop the compressor at once, and it shall show the DC
over-high voltage failure; it should clear out the failure when the
voltage dropped to U
DC
<[U
DC Jiekuangchun Recovery
] and the compressor
stopped for 3 min.
2.Over-Low Voltage Protection for DC Bus:
If it found the DC bus voltage U
DC
<[U
DC Wantuochun Protection
], turn off
PFC and stop the compressor at once, and it shall show the DC
over-low voltage; and it should clear out the failure when the
voltage raised to U
DC
>[U
DC Wantuochun Recovery
] and the compressor
stopped for 3 min.
3.To detect voltage abnormity protect for DC bus when
getting electricity:
If it found the DC bus voltage U
DC
>[U
DC—Over-High Voltage
], turn off the
relay at once, and shows voltage abnormity failure for DC Bus.
And the failure can't recover except to break off and get the
electricity.
(15)Abnormity Protection for Four-way Valve
Under the model of heating operation in good condition: the
compressor is detected [T
Inner Tube
<(T
Inner Ring
-T
Abnormity Temperature Difference
For Four-Way Valve Reversion
)], during the running, it should be regarded as
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
