Refrigerant Leak Detection Function - Toshiba RAV-GM562ATP-TR Service Manual

9-4. Refrigerant leak detection function

Monitors the amount of refrigerant being calculated base on the temperature sensors, PMV opening
during test run operation, and detects any refrigerant leaks during operation and indicates it using the
LEDs on the outdoor unit or remote controller. Refrigerant leak detection is not performed in usual
operation. Ensure to set test run mode.
• Test run mode. Refer to the operation manual of the indoor unit or remote controller for how to start up.
• Test run mode continues maximum 60 minute. After 60 minutes it is automatically stopped.
• It is recommended to set the indoor unit to the maximum fan speed while test run.
[Refrigerant leak detection method]
1) When the first test run mode after installation is executed, the correction value determined by
"The initial state" such as the pipe length and indoor unit type is stored (*)
Refrigerant leakage is detected even when the first test run mode is executed, but the accuracy is
not high. Mainly, the detection results from the next time onwards. Please mainly refer the results in
the next test run.
* The correction value is stored separately for cooling and heating.
2) Refrigerant leakage will detected in the next test run mode by using correction value memorized in
1). You can check the detection result with LEDs on the outdoor unit or "Monitor function" on the
remote control (RBC-AWSU52-E).
CAUTION
* Detects any slow leaks at the stages of not cool heat and trouble stoppages during operation but may not
detect fast leaks sometimes.
* Refrigerant leaks may even be detected because of refrigerant circulation failures due to PMV (Pulse Motor
Valve) blockages, operation failures, capillary blockages, strainer blockages, etc. And indoor unit filter
blockages may change the refrigeration cycle and detect the refrigerant leak.
* Refrigerant leak detection may not be possible depending on the indoor and outdoor air temperature
conditions during operation. We recommend test run operation when indoor and outdoor conditions are
satisfied in next time.
29°C ≤ Outdoor temperature < 39°C
Cooling
18°C ≤ Indoor temperature < 32°C
-5°C ≤ Outdoor temperature < 7°C
Heating
17°C ≤ Indoor temperature < 29°C
When any refrigerant leaks are detected, check the details and confirm whether refrigerant leaked or not.
If refrigerant is leaked, ensure to identify where the leak is, recover the remaining refrigerant, and then
recharge with the correct amount using the appropriate methods.
The leakage signal can be cleared by power supply reset, refrigerant recovery with service switches
operation and test run mode performed again.
After checking the details, if you want to continue using the device, please do a power supply reset to
clear the leakage signal.
When performing refrigerant recovery, operating the service switches SW01 and SW02 will clear the
leakage signal and correction value determined by initial state condition. And test run mode in next time
is performed as first time.
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