Sharp AE-X12PSR, Service Manual

Page: 31 / 73

SHARP(CHINA)INVESTMENT CO.,LTD
Item Mode Control
operation When resistance is
low (tempera-ture
judged higher than
actual) Short-circuit When resistance
is high (tempera-
ture judged lower
than actual)
Open-circuit
Compressor
discharge pipe
thermistor (TH1)
Cooling
Dyring
Heating
Expansion valve
control and
compressor
protection
Compressor operates,
but room does not
become cool or warm
Compressor
discharge pipe
temperature
error indica-
tion.
Layer short-circuit or
open-circuit may
result in compres-sor
in normal oper-ation.
Compressor
discharge pipe
temperature
error indica-
tion.
Cooling
Drying
Outdoor unit heat
exchanger over
heat prevention
Compressor operates at
low speed or stops.
Outdoor unit
thermistor short-
circuit error
indication.
Normal operation. Outdoor unit
thermistor
open-circuit
error indication.
Heat exchanger
thermistor (TH2)
Heating Expansion valve
control Defrosting
Defrosting operation is
not activated as needed,
and frost accumulates
on outdoor unit
Outdoor unit
thermistor
short-circuit error
indication.
Defrosting operation
is activated unnece-
ssarily, and room
does not become
warm
Outdoor unit
thermistor
short-circuit
error indication.
Auto Operation mode
judgement
Cooling mode is
activated even if room
temperature is low.
Outdoor unit
thermistor
short-circuit error
indication.
Heating mode is
activated even if
room temperature is
high.
Outdoor unit
thermistor
open-circuit
error indication.
Cooling
Drying
Operation not
affected
Normal operation. Outdoor unit
thermistor short
-circuit error
indication.
Normal operation. Outdoor unit
thermistor open
-circuit error
indication.
Outside air
temper-ature
thermistor (TH3)
Heating Rating
controlDefrosting
Defrosting operation is
activated unnecessarily.
Outdoor unit
ther-mistor short
-circuit error
indication.
Defrosting operation
is not activated, and
frost accumulates on
outdoor unit.
Outdoor unit
thermistor
open-circuit
error indication.
[3] THERMISTOR TEMPERATURE CHARACTERISTICS
1. Indoor unit and outdoor exchange temperature and outside air temperature thermistor temperature characteristics
TEMP.
Resistance
(k Ohm)
Votalge of
resisitance TEMP.
Resistance
(k Ohm)
Votalge of
resisitance TEMP.
Votalge of
resisitance
-30 63.513 4.628 15 7.447 2.968 60 1.464 1.115
-29 60.135 4.609 16 7.148 2.918 61 1.418 1.088
-28 56.956 4.589 17 6.863 2.868 62 1.374 1.061
-27 53.963 4.568 18 6.591 2.819 63 1.331 1.035
-26 51.144 4.547 19 6.332 2.769 64 1.290 1.009
-25 48.488 4.524 20 6.084 2.720 65 1.250 0.984
-24 45.985 4.501 21 5.847 2.671 66 1.212 0.960
-23 43.627 4.477 22 5.621 2.621 67 1.175 0.936
-22 41.403 4.452 23 5.404 2.572 68 1.139 0.913
-21 39.305 4.426 24 5.198 2.524 69 1.105 0.890
-20 37.326 4.399 25 5.000 2.475 70 1.072 0.868
-19 35.458 4.371 26 4.811 2.427 71 1.040 0.847
-18 33.695 4.343 27 4.630 2.379 72 1.009 0.825
-17 32.030 4.313 28 4.457 2.332 73 0.979 0.805
-16 30.458 4.283 29 4.292 2.285 74 0.950 0.785
-15 28.972 4.252 30 4.133 2.238 75 0.922 0.765
-14 27.567 4.219 31 3.981 2.192 76 0.895 0.746
-13 26.239 4.186 32
3.836
2.146 77 0.869 0.728
3-3
Resistance
(k Ohm)