Sharp AY-ZP35PR Service Manual page 27

AY-ZP35PR
2. Outdoor unit
Item
Compressor cham- Cooling
ber thermistor Dehumidifying
(TH1) Heating
Heat exchanger Cooling
thermistor (TH2) Dehumidifying
Heating
Outside air temper- Auto
ature thermistor
(TH3)
Cooling
Dehumidifying
Heating
Suction pipe ther- Cooling
mistor (TH4) Dehumidifying
Heating
2-way valve ther- Cooling
mistor (TH5) Dehumidifying
Heating
Mode Control operation When resistance
Expansion valve
control and com-
pressor protection
Outdoor unit heat
exchanger over-
heat prevention
Expansion valve
control
Defrosting
Operation mode
judgment
Operation not
affected
Rating control
Defrosting
Expansion valve
control
Expansion valve
control
Expansion valve
control
Operation not
affected
Short-circuit
is low (tempera-
ture judged higher
than actual)
Compressor oper- Compressor high
ates, but room does temperature error
not become cool or indication.
warm (expansion
valve is open).
Compressor oper- Outdoor unit ther-
ates at low speed mistor short-circuit
or stops. error indication.
Defrosting opera- Outdoor unit ther-
tion is not activated mistor short-circuit
as needed, and error indication.
frost accumulates
on outdoor unit
(expansion valve is
closed).
Cooling mode is Outdoor unit ther-
activated even if mistor short-circuit
room temperature error indication.
is low.
Normal operation. Outdoor unit ther-
mistor short-circuit
error indication.
Defrosting opera- Outdoor unit ther-
tion is activated mistor short-circuit
unnecessarily. error indication.
Compressor oper- Outdoor unit ther-
ates, but room does mistor short-circuit
not become cool error indication.
(expansion valve is
open).
Compressor oper- Outdoor unit ther-
ates, but room does mistor short-circuit
not become warm error indication.
(expansion valve is
open).
Frost accumulates Outdoor unit ther-
on indoor unit evap- mistor short-circuit
orator and room error indication.
does not become
cool (expansion
valve is closed).
Normal operation. Outdoor unit ther-
mistor short-circuit
error indication.
3-4
When resistance Open-circuit
is high (tempera-
ture judged lower
than actual)
Layer short-circuit Outdoor unit ther-
or open-circuit may mistor open-circuit
result in compres- error indication.
sor in normal oper-
ation.
Normal operation. Outdoor unit ther-
mistor open-circuit
error indication.
Defrosting opera- Outdoor unit ther-
tion is activated mistor open-circuit
unnecessarily, and error indication.
room does not
become warm
(expansion valve is
open).
Heating mode is Outdoor unit ther-
activated even if mistor open-circuit
room temperature error indication.
is high.
Normal operation. Outdoor unit ther-
mistor open-circuit
error indication.
Defrosting opera- Outdoor unit ther-
tion is not activated, mistor open-circuit
and frost accumu- error indication.
lates on outdoor
unit.
Frost accumulates Outdoor unit ther-
on evaporator inlet mistor open-circuit
section, and room error indication.
does not become
cool (expansion
valve is closed).
Frost accumulates Outdoor unit ther-
on expansion valve mistor open-circuit
outlet section, and error indication.
room does not
become warm
(expansion valve is
closed).
Compressor oper- Outdoor unit ther-
ates, but room does mistor open-circuit
not become cool error indication.
(expansion valve is
open).
Normal operation. Outdoor unit ther-
mistor open-circuit
error indication.