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Abnormal point and detecting method
Causes
Check points
Refrigerant shortage
When the conditions of below detecting
mode 1 or 2 are satisfied during the
compressor operation.
<Detecting mode 1>
When the below conditions are satisfied
completely.
1. Compressor is operating in HEAT
mode.
2. Discharge super heat is 80; or more.
3. Difference of outer temperature
thermistor (TH7) and outdoor piping
temp. thermistor (TH3) applies to the
formula of (TH7-TH3)<5;.
4. High-pressure sensor is below about
2.04MPa.
<Detecting mode 2>
When the below conditions are satisfied
completely.
1. Compressor is operating.
2. When cooling, discharge super heat is 80;
or more.
When heating, discharge super heat is 90;
or more.
High pressure sensor is below about 2.32MPa.
1 Gas leakage, Gas shortage
2 When heating operation, scant
refrigerant operation (When heating,
air flow or thermo OFF are mixed-
operation, it cause a refrigerant
shortage operation.)
3 Ball valve performance failure
(not full opened.)
4 Error detection of discharge super heat
1) High-pressure sensor defective
2) Discharge temperature thermistor
defective
3) Thermistor input circuit defective and
high-pressure sensor defective in
multi controller board
5 Error detection of TH7/TH3
1) Thermistor defective
2) Thermistor input circuit defective in
multi controller board
1 Check the refrigerant amount.
2 Check the operation condition and
refrigerant amount.
3 Check the ball valve is full opened.
4
1) Check the ball valve is full opened.
2) Check the resistance of discharge
temperature thermistor.
3) According to “Outdoor unit functions”,
set the SW2 and check the high-
pressure sensor level.
According to “Outdoor unit functions”,
check the discharge temp. thermistor level.
When the high-pressure sensor and
discharge temp. thermistor are normal
if the above mentioned detecting
pressure level and temp. are big
different from the actual pressure and
temp. replace the multi controller board.
5
1) Check the resistance of thermistor.
2) According to “Outdoor unit functions”,
check the outdoor pipe temp. thermistor
level.
3) According to “Outdoor unit functions”,
check the outer temp. thermistor level.
1501
Water leakage
1. Suspensive abnormality when float switch
detects to be in the water and drain pump
turns on and off except during cooling or dry
mode.
2. Abnormal when detecting that the drain
pump turns on and off again within 1 hour
after the detection of water leakage
suspensive abnormality, and repeats the
detection twice. <2500> is displayed.
3. The unit continues to detect abnormality
while turned off.
4. To release water leakage suspensive
abnormality
· When not detecting that the drain pump
turns off and on within 1 hour after
detecting suspensive abnormality.
· When turning to cooling operation or dry
operation.
· Detected that [liquid pipe temperature –
room temperature][ -10deg[-18°F]
2500
(Float
switch
model)
1 Check the drain function.
2 Check moving part of float switch.
3 Check the value of resistance with the
float switch ON/OFF.
1 Defective drain
Clogged drain pump
Clogged drain pipe
Adverse flow of drain in other units
2 Defective moving part of float switch
Foreign matter on the moving
part of float switch(ex. sludge etc.)
3 Defective float switch
Operation mode: When drain pump turns on as float switch detects to be in the water except during cooling/dry mode
6 min.6 min.
15 sec.
In the water
Water leakage suspensive abnormality
In the water
Water leakage abnormality
In the air In the water In the air
15 sec.
Within 1 hour Within 1 hour
15 sec. 15 sec.
15 sec.
ON
OFF
Drain pump
Float switch
ON
OFF
OC376B--2.qxp 08.1.17 1:15 PM Page 37