Chapter 3. Function And Operation Of; Protection Device Functions And Operations - Sharp AY-ZP35PR Service Manual

CHAPTER 3.
FUNCTION AND OPERATION OF PROTECTIVE PROCEDURES

[1] PROTECTION DEVICE FUNCTIONS AND OPERATIONS

Function
1 Indoor unit fan Operation stops if there is no
lock input of rotation pulse signal
from indoor unit fan motor for 1
minute.
Indoor unit fan ro- Operation stops if rotation pulse
tation speed error signal from indoor unit fan in-
dicates abnormally low speed
(about 300 rpm or slower).
2 Indoor unit freeze Compressor stops if temperature
prevention remains below 0°C for 4 min-
utes.
3 2 - w a y v a l v e Compressor stops if tempera-
freeze prevention ture of outdoor unit 2-way valve
remains below 0°C for 10 contin-
uous minutes during cooling or
dehumidifying operation.
4 Indoor unit heat Operating frequency lowers
exchanger over- if indoor unit heat exchanger
heat shutdown temperature exceeds overheat
temperature during heating op-
eration.
Compressor stops if indoor unit
heat exchanger temperature ex-
ceeds overheat temperature for
60 seconds at minimum frequen-
cy.Overheat temperature setting
value indoor unit heat exchanger
thermistor temperature: about 45
to 54°C
5 Outdoor unit heat Operation frequency lowers if
exchanger over- outdoor unit heat exchanger
heat shutdown temperature 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
charge overheat if 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 cool-
ing operation, or 60 seconds in
heating operation) at minimum
frequency.
7 D e h u m i d i f y i n g Compressor stops if outside air
operation tempo- temperature thermistor is lower
rary stop than about 16°C during dehu-
midify-ing operation.
8 DC overcurrent Compressor stops if DC current
error RI DERXW  $ RU KLJKHU ÀRZV LQ
IPM.
9 AC overcurrent Operating frequency lowers if
error outdoor AC current exceeds
peak control current value. out-
door stops if compressor AC
current exceeds peak control
current value at minimum fre-
quency.
Description Detection period
When indoor unit fan is
in operation
When indoor unit fan is
in operation
When in cooling or de-
humidifying operation
When in cooling or de-
humidifying operation
When in heating opera-
tion
When in cooling or de-
humidifying operation
When compressor is in
operation
When in dehumidifying
operation
When compressor is in
operation
When compressor is in
operation
Operation
Reset condition
Operation OFF or ON
Operation OFF or ON
Automatic reset when
heat exchanger temper-
ature 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 temperature
rises above 16°C.
Operation OFF or ON
Operation OFF or ON
3-1
AY-ZP35PR
Self-diagnosis result
display
Indoor Indoor unit
unit error
display
1 Yes None
1 Yes None
- None None
None Yes Yes
None Yes Yes
None Yes Yes
None Yes Yes
None Yes Yes
Yes 2 Yes Yes
Yes 2 Yes Yes
Outdoor
unit