Refrigerant Leakage Detection; Checking The Record Of The Initial Value; Confirming The Refrigerant Leakage; Clearing The Initial Valve - Toshiba SMMS-e Quick Reference

Refrigerant Leakage
64
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

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)

(2) Clearing the initial valve

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.
SW01 SW02
2 13

(3) Checking the record of the initial value

Set SW01 to 03 as shown in the following table to confirm the record of the initial value.
SW01 SW02
2 14
2 15
[ Clear ]
Return SW01 / SW02 / SW03 on the interface PCB in the Outdoor Unit to [1 / 1 / 1].
Note
(a) During the operation, the slow leaks can be detected.
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.
(b) Poor refrigerant circulation may be detected as a refrigerant leaks.
(e.g. plugged strainers / capillaries, malfunction / clogging of the PMV / 2-way valve / 4-way valve)
(c) Due to the outside temperature, the initial value may not be recorded, or it may be impossible to determine
the leakage.
(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.
Air to air heat exchanger with DX coil unit.
SW03
14

Refrigerant leakage detection

SW03
14 Colling initial value
14 Heating initial value
Display detail
A [ L. d ]
Clear the data : [... C.L] (Only display for 5 seconds)
Display detail
A [ C. i ]
B Incomplete : [... ... 0]
Completed : [... ... 1]
A [ H. i ]
B Incomplete : [... ... 0]
Completed : [... ... 1]