Chapter 3. Function And Operation Of Pro- Tective Procedures Protection Device Functions And Operations - Sharp AY-XP9LSR Service Manual

AYXP9LSR
CHAPTER 3.
AYXP9LSR
FUNCTION AND OPERATION OF PROTECTIVE PROCEDURES
[1] PROTECTION DEVICE FUNCTIONS AND OPERATIONS
* These models no have Expansion valve, Suction temp. thermo. and 2-way valve temp. thermo.
Function
1 Indoor unit fan lock Operation stops if there is no
input of rotation pulse signal from
indoor unit fan motor for 1 minute.
Indoor unit fan rota- Operation stops if rotation pulse
tion speed error signal from indoor unit fan indi-
cates abnormally low speed
(about 300 rpm or slower).
2 Indoor unit freeze Compressor stops if temperature
prevention remains below 0°C for 4 minutes.
3 2-way valve freeze Compressor stops if temperature
prevention of outdoor unit 2-way valve
remains below 0°C for 10 continu-
ous minutes during cooling or
dehumidifying operation.
4 Indoor unit heat Operating frequency lowers if
exchanger over- indoor unit heat exchanger tem-
heat shutdown perature exceeds overheat tem-
perature during heating
operation.
Compressor stops if indoor unit
heat exchanger temperature
exceeds overheat temperature for
60 seconds at minimum fre-
quency.
Overheat temperature setting
value indoor unit heat exchanger
thermistor temperature: about 45
to 54°C
5 Outdoor unit heat Operation frequency lowers if out-
exchanger over- door unit heat exchanger temper-
heat shutdown ature exceeds about 55°C during
cooling operation.
Compressor stops if outdoor unit
heat exchanger temperature
exceeds about 55°C for 120 sec-
onds at minimum frequency.
6 Compressor dis- Operating frequency lowers if
charge overheat temperature of compressor
shutdown chamber thermistor (TH1) falls
below about 110°C.
Compressor stops if temperature
of compressor chamber ther-
mistor (TH1) remains at about
110°C (for 120 seconds in cooling
operation, or 60 seconds in heat-
ing operation) at minimum fre-
quency.
7 Dehumidifying oper- Compressor stops if outside air
ation temporary temperature thermistor is lower
stop than about 16°C during dehumidi-
fying operation.
8 DC overcurrent Compressor stops if electric cur-
error rent of about 25 A or higher flows
in IPM.
Operation
Description Detection period
When indoor unit fan
is in operation
When indoor unit fan
is in operation
When in cooling or
dehumidifying opera-
tion
When in cooling or
dehumidifying opera-
tion
When in heating
operation
When in cooling or
dehumidifying opera-
tion
When compressor is
in operation
When in dehumidify-
ing operation
When compressor is
in operation
Service Manual
Reset condition
Operation OFF or ON *2
Operation OFF or ON *2
Automatic reset when
heat exchanger tem-
perature rises above
freeze prevention
temperature (2°C or
higher)
Automatic reset when
temperature of 2-way
valve rises above
10°C.
Automatic reset after
safety period (180
sec).
Automatic reset after
safety period (180
sec).
Automatic reset after
safety period (180
sec).
Automatic reset when
outside air tempera-
ture rises above
16°C.
Operation OFF or ON Yes *1
3 – 1
Self-diagnosis
result display
Indoor Indoor Outdoor
unit unit unit
error
display
Yes None
Yes None
— None None
None Yes Yes
None Yes Yes
None Yes Yes
None Yes Yes
None Yes Yes
Yes Yes