7 Troubleshooting
Installation manual
11
RXA20~35A2V1B
R32 split series
3P517827-1 – 2017.12
7
Troubleshooting
7.1
Fault diagnosis using LED on
outdoor unit PCB
LED is…
Diagnosis
flashing
Normal.
▪ Check the indoor unit.
ON
▪ Turn the power OFF and back ON, and
check the LED within approximately 3
minutes.
If the LED is ON again, the outdoor unit
PCB is faulty.
OFF
1
Supply voltage (for power saving).
2
Power supply fault.
3
Turn the power OFF and back ON, and
check the LED within approximately 3
minutes.
If the LED is ON again, the outdoor unit
PCB is faulty.
DANGER: RISK OF ELECTROCUTION
▪ When the unit is not operating, the LEDs on the PCB
are turned off in order to save power.
▪ Even when the LEDs are off, the terminal block and the
PCB may be powered.
8
Disposal
NOTICE
Do NOT try to dismantle the system yourself: the
dismantling of the system, treatment of the refrigerant, oil
and other parts MUST comply with applicable legislation.
Units MUST be treated at a specialised treatment facility
for reuse, recycling and recovery.
8.1
To pump down
Example:
To protect the environment, pump down when relocating
the unit or when disposing of the unit.
DANGER: RISK OF EXPLOSION
Pump down – Refrigerant leakage.
If you want to pump
down the system, and there is a leakage in the refrigerant
circuit:
▪ Do NOT use the unit's automatic pump down function,
with which you can collect all refrigerant from the
system into the outdoor unit.
Possible consequence:
Self-combustion and explosion of the compressor
because of air going into the operating compressor.
▪ Use a separate recovery system so that the unit's
compressor does NOT have to operate.
NOTICE
During pump down operation, stop the compressor before
removing the refrigerant piping. If the compressor is still
running and the stop valve is open during pump down, air
will be sucked into the system. Compressor breakdown or
damage to the system can result due to abnormal pressure
in the refrigerant cycle.
Pump down operation will extract all refrigerant from the system into
the outdoor unit.
1
Remove the valve cap from the liquid stop valve and the gas
stop valve.
2
Carry out forced cooling. See
.
3
After 5 to 10 minutes (after only 1 or 2 minutes in case of very
low ambient temperatures (<−10°C)), close the liquid stop valve
with a hexagonal wrench.
4
Check on the manifold if the vacuum is reached.
5
After 2-3 minutes, close the gas stop valve and stop forced
cooling.
c
b
e
d
d
a
a
Gas stop valve
b
Closing direction
c
Hexagonal wrench
d
Valve cap
e
Liquid stop valve
8.2
To start and stop forced cooling
There are 2 methods to perform forced cooling.
▪
Method 1.
Using the indoor unit ON/OFF switch (if present on the
indoor unit).
▪
Method 2.
Using the indoor unit user interface.
8.2.1
To start/stop forced cooling using the
indoor unit ON/OFF switch
1
Press the ON/OFF switch for at least 5 seconds.
Result:
Operation will start.
Note:
Forced cooling stops automatically after 15 minutes.
2
To stop operation sooner, press the ON/OFF switch.
8.2.2
To start/stop forced cooling using the
indoor unit user interface
1
Set the operation mode to
cooling
.
For the procedure, refer to "To perform a test run" in the installation
manual of the indoor unit.
Note:
Forced cooling will stop automatically after around
30 minutes.
2
To stop operation sooner, press the ON/OFF switch.
INFORMATION
If forced cooling is used and the outside temperature is <
−10°C, the safety device may prevent operation.
▪ Warm the outside temperature thermistor on the
outdoor unit to ≥−10°C.
Result:
Operation will start.
