Floor Ceiling Air-Conditioning Unit
24
Table.12
D1 [Red]
D2 [Red]
Trouble Case
Origin of Trouble
Measure
OFF
OFF
Power problem
No power (24V)
to demand control
board terminals R
and C or demand
control board
failure.
1.Check control transformer power (24V).
2.If power is available to demand control
board and LED(s) do not light, replace
control board.
0.5s
Circulating
Flash
OFF
Actuation of high
pressure switch
High pressure
switch
Abnormality is detected when the contact
of the high pressure switch opens for 3
sec. The system will be shut down. The
unit will report this fault. For the first two
faults within 30 minutes, the unit can be
recovered automatically. If over three
times, the unit cannot be recovered
automatically.
OFF
0.5s
Circulating
Flash
Actuation of low
pressure switch
Low pressure
switch
When the unit runs more than 4 minutes
or does not run, the low pressure switch
opens for more than3sec and the system
will be shut down..The unit will report
this fault. For the first two faults within
30 minutes, the unit can be recovered
automatically. If over three times, the unit
cannot be recovered automatically.
0.5s
Circulating
Flash
Continuous
Light
Air discharge
high-temperature
protection of
compressor
Exhaust over-
temperature
Protection
The exhaust temperature is higher than
125°C for more than 5s, the system
will be shut down. After stopping the
compressor for 3 mins, if the exhaust
temperature is lower than 90°C for more
than 5s, the compressor will re-start.
For the first two faults within 30 minutes,
the unit can be recovered automatically.
If over three times, the unit cannot be
recovered automatically.
Continuous
Light
OFF
Malfunction of
exhaust Temp.
Sensor
Exhaust
temperature
sensor
If the exhaust temperature sensor is
detected of open circuit 5 seconds
successively after the compressor is
started for 3 minutes or short circuit 5
seconds successively at any time The
system will be shut down. After the fault is
eliminated, the system can automatically
resume to operation.
0.5s
Circulating
Flash
0.5s
Circulating
Flash
Normal operation
Unit operating
normally or in
standby mode.
None required
To stop test running, press the ON/OFF button.
For the operation method, refer to the operating manual and perform operation check.
Check that there are no abnormal sounds or vibration during the test running.
