SiBE811001EB
Troubleshooting
CONVENI-PACK
288
Check the Factors of Overheat Operation (Air conditioning)
Identify the defective points referring to the failure factor analysis (FTA) as follows.
CHECK 3-1
Defective control
Defective control
Refrigerant shortage
Irregular piping length
Bend/collapse
(Including moisture choke)
Stop valve is closed.
Defective valve coil
Defective control PCB
Defective valve body
Defective valve coil
Defective valve body
Defective control PCB
Defective valve coil
Defective valve body
Defective control PCB
←
Check if the voltage property is normal.
←
Does the piping length fall in the permissible range?
←
Conduct visual checks.
←
Remove the moisture by vacuum break.
←
Check if the stop valve is open.
(
∗
1)
Temperature
increase of
discharge
pipe
Defective
discharge
pipe
temperature
control
Defective electronic
expansion valve
control (Y2E)
Subcooling
electronic
expansion
valve failure
Control
failure
Defective subcooling
heat exchanger outlet
thermistor
←
Check if coil resistance and
insulation are normal.
←
Check if the voltage
property is normal.
←
Check if the connector is
connected properly.
Check if the thermistor
resistance property is normal.
←
Check if the pressure value
given by the service checker
corresponding to actual
measurement value by the
sensor.
Defective of
four way valve
operation
Four way valve (A or B or C)
is in the middle position.
←
Check if the piping temperature
connected to the four way valve is
normal.
Compressor
overheat
Superheat due to
defective compressor
Indoor unit
electronic expansion
valve failure
[In cooling mode]
If the indoor unit
electronic
expansion valve
is excessively
throttled. (
∗
2)
Defective
superheated
degree
control.
[In heading mode]
If the outdoor unit
electronic
expansion valve
is excessively
throttled. (
∗
3)
Outdoor unit
electronic expansion
valve failure
Large resistance
of piping
Defective thermistor for
indoor unit gas pipe
Defective thermistor for
indoor unit liquid pipe
←
Check if coil resistance and
insulation are normal.
←
Check if the connector is connected
properly.
Check if the thermistor resistance
property is normal.
←
Check if the connector is connected
properly.
Check if the thermistor resistance
property is normal.
←
Check if coil resistance and
insulation are normal.
←
Check if the connector is connected
properly.
Check if the thermistor resistance
property is normal.
←
Check if the pressure value given by
the service checker corresponding to
actual measurement value by the
sensor.
Superheat due to
shaft damage
Defective thermistor
for suction pipe
Defective low
pressure sensor
Defective low
pressure sensor
∗
1: Refer to subcooling electronic expansion valve control.
∗
2: “Superheating temperature control” in cooling mode is conducted by indoor unit electronic expansion valve.
∗
3: Superheating temperature control in heating mode is conducted by outdoor unit electronic expansion valve (Y1E).
∗
4: Judgement criteria of superheat operation:
(1) Suction gas superheating temperature: 20 degrees and over. (2) Discharge gas superheating temperature: 110 degrees and
over, except for immediately after starting and drooping control, etc..
(Use the above stated values as a guide. Depending on the other conditions, the unit may be normal despite the values within the
above scope.)