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11-3.Check Procedure to Search Cause of Compressor Oil<br />

Shortage<br />

Are the balance pipes of<br />

all outdoor units connected to the<br />

same refrigerant line fully open?<br />

No<br />

Open the balance pipe valves fully.<br />

Yes<br />

Are there<br />

any miswiring or incorrect<br />

connection of TK1, TK2, TK3, TK4 and<br />

TK5 sensor in the unit that has<br />

replaced compressor?<br />

No<br />

Correct the miswiring or connection.<br />

TK1: CN531 TK2: CN532<br />

TK3: CN533 TK4: CN534<br />

TK5: CN535<br />

Yes<br />

Are the<br />

characteristics of the TK1,<br />

TK2, TK3, TK4 or TK5 sensors of the<br />

unit that has replaced compressor<br />

correct?<br />

No<br />

Replace the faulty sensor.<br />

Yes<br />

With the compressor(s) disconnected,<br />

check the oil circuit in accordance<br />

with the procedure described below.<br />

(To next page)<br />

260

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