Sharp AE-X12PSR, Service Manual, Page: 29 / 73

SHARP(CHINA)INVESTMENT CO.,LTD
CHAPTER 3. FUNCTION AND OPERATION OF PROTECTIVE PROCEDURES
[1] PRETECTION DEVICE FUNCTIONS AND OPERATIONS
Operation
FUNTION
Description
1
Compressor
discharge over heat
shut-down
Discharge temperatureTP2
(95 ), for ć bid the frequency
raise.
Discharge temperatureTP3
(100 ),drop the operating ć
frequency. If discharge tem-
perature over 105 ć , shut-
down the compressor,outdoor
fan motor stops after
15 seconds.
When
compressor is
in operation
Discharge temperature
is below than TP2-2 . ć
Discharge temperature
˘ TP2(95 ) ć .
Discharge temperature
˘ TP1(90 ) ć and after
compressor stops for 3
minutes.
P4 none yes
2
Compressor delaye
operation
The compressor delayes 3
minutes to restart
When the com-
pressor stopes
The compressor stops
for 3 minutes
none none none
3
Lower voltage
preventiion
The unit stops if AC
158V
When the unit in
operation
When AC162V P1 none yes
4
Higher voltage
preventiong
The unit stops if
AC265V
When the mach-
ine in operation
When AC260V P1 none yes
5
Over current When the outdoor current
I
max
,the compressor stops
and outdoor motor stops after
15 seconds
When the
machine in
operation
When the outdoor
current ˘ I normal
P2 none yes
6
Compressor drive If the system can’t check the
feed-back signal of compress-
or or load is exceptonal or
driver fail then shut down
the outdoor unit
When the com-
pressor drives or
operates.
Operation offf of on P9 none yes
7
Indoor unit evaporator
frezze prevention
Compressor stops if indoor
pipe temperature IPT-1
ć
and remains 5minutes
When in cooling
or dehumidifying
operation
Automatic reset when
indoor pipe temperature
IPT 6
ć
and remains
10 minutes
P5 none yes
8
Outdoor unit overheat
prevention
Compressor shtops if the
outdoor unit heatexchanger
temperature OPTTOP4
When the unit in
operation
When the outdoor pipe
temperature OPTTOP1
P6 outdoor
light flash
5cycle
none yes
9
Indoor unit overheat
prevention
Compressor stops if indoor
exchaege temperature
IPTTIP4
When the unit is
in operation
When the indoor pipe
temperature IPTTIP1
P7 yes none
10
IPM pretector The outdoor unit shutt down if
the IPM checks the
temperature of IPM itself or
the current is too high
When the unit is
in operation
When the IPM chck the
temperature of IPM itself
or the current fall to
normal
P0 none yes
11
Outdoor unit heat
exchanger thermistor
short-circuit
Indoor and outdoor unit stops
if there is short-circuit or
break in outdoor unit heat
exchanger thermistor
At compressor
startup
Operation OFF or ON E3 yes yes
12
Outdoor unit outside
air temperature ther-
mistor open-circuit
error
Indoor and outdoor unit stops
if there is short-circuit or
break in outdoor unit heat
exchanger thermistor
At compressor
startup
Operation OFF or ON E8 yes yes
3-1
Detection
period
Reset condition
Indoor unit
error display
Self-daignosis
result display
Indoor
unit Outdoor
unit