Toshiba SMMS-e, Quick Reference, Page: 64 / 96

64
Refrigerant Leakage
Detection
The refrigerant leakage and be confirmed by using the switches on interface PCB of
the outdoor unit.
If there is a leak, the location must be found in order to recover the refrigerant.
After that, implement appropriate countermeasure and refill the refrigerant to its
standard volume.
Refrigerant leaks can be detected by comparing the Actual opening of PMV with the calculated
opening of PMV* during the Operation.
* Calculated opening of PMV : calculated from the initial value (C.i / H.i ), the pressure sensor value,
the compressor’s rotation speed, and the opening of PMV. The initial values are automatically
saved when the specified conditions are met.
(A leak can be detected only when C.i / H.i = 1)
[Operation]
(1) Confirming the refrigerant leakage
(2) Clearing the initial valve
(3) Checking the record of the initial value
[ Clear ]
Note
(a) During the operation, the slow leaks can be detected.
(b) Poor refrigerant circulation may be detected as a refrigerant leaks.
(d) The initial value can not be saved until the accumulated operating time has reached at least 20 hours.
(e) The initial value can not be saved if the indoor unit’s operating ratio is low.
(f) If the following indoor units are connected, leakage determination is not possible.
(c) Due to the outside temperature, the initial value may not be recorded, or it may be impossible to determine
the leakage.
SW01 SW02 SW03 Display detail
2 13 14 Refrigerant leakage detection
A
B
[ L. d ]
SW01 SW02 SW03 Display detail
2 14 14 Colling initial value
A [ C. i ]
Incomplete : [... ... 0]
Completed : [... ... 1]
B
2 15 14 Heating initial value
A [ H. i ]
Incomplete : [... ... 0]
Completed : [... ... 1]
Clear the data : [... C.L] (Only display for 5 seconds)
Set SW01 to 03 as show in the following table to confrim whether the leaks are being detected.
(It also can be confirmed by remote control monitor function. Refer to monitor function of remote
controller switch)
If the system is changed (e.g. indoor units are increased / replaced, outdoor units are moved,
of refrigerant is refilled / increased) it is necessary to clear the initial value that had been saved.
Make sure that the compressor has stopped, and then press and hold SW04 for at least 5 seconds.
Set SW01 to 03 as shown in the following table to confirm the record of the initial value.
Return SW01 / SW02 / SW03 on the interface PCB in the Outdoor Unit to [1 / 1 / 1].
However, if the air-conditioner can not cooling down / can not warming up / make an unusual stop,
the slow leaks might not be detectable. The fast leaks always can not be detected.
(e.g. plugged strainers / capillaries, malfunction / clogging of the PMV / 2-way valve / 4-way valve)
Air to air heat exchanger with DX coil unit.