Toshiba SHRM R410A Quick Reference page 69

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Check Procedure to Search Cause of Compressor Oil Shortage

Are the balance pipes of

all outdoor units connected to the

same refrigerant line fully open?

Are there

any miswiring or incorrect

connection of TK1, TK2, TK3, TK4 and

TK5 sensor in the unit that has

replaced compressor?

Are the

characteristics of the TK1,

TK2, TK3, TK4 or TK5 sensors of the

unit that has replaced compressor

correct?

With the compressor(s) disconnected,

check the oil circuit in accordance

with the procedure described below.

(To next page)

Yes

Open the balance pipe valves fully.

Correct the miswiring or connection.

TK1: CN531 TK2: CN532

TK3: CN533 TK4: CN534

TK5: CN535

Replace the faulty sensor. .