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4. SERVICE PROCEDURES
(2)
Checking the Protective Devices
•
Disconnect the connector, which consists of P (plug) and S (socket) when
you want to check the protective device.
•
Then check continuity among plug's (and/or socket's) terminal as in Fig. 44.
•
Normality of the protective device can be judged by the following table.
The Protective Device is proved normal if there is a continuity between
terminals.
1
Indoor fan motor thermal protector (49FI) . . . . . . Indoor unit
•
Disconnect 9P connector (WHT) which leads to the indoor fan motor (FMI).
•
Check the socket's terminals between No. 8 (GRY lead wire) and No. 9
(GRY lead wire).
2
Compressor motor thermal protector (49C) . . . . . . Outdoor unit
•
Only for the AE425SH3E and AE436SH3E. Disconnect the 8P
connector (white), and the 9P connector (white) on the P.C. board, and
4
check 8P (white) plug's No. 4 (GRY lead wire) and socket's No. 9 (GRY lead
wire) on the P.C.board.
3
Outdoor fan motor thermal protector (49FO) . . . . . . Outdoor unit
•
Disconnect 8P connector(s) (WHT) which lead(s) to the outdoor fan motor
(FMO).
•
Check socket's terminal between No. 3 (GRY lead wire) and No.4 (GRY lead
wire).
4
High pressure switch (63PH) . . . . . . Outdoor unit
•
Disconnect the socket (63PH) of 3P (red) connecting to the P.C. board, and
check both sides (1 (white), 3 (red)).
socket
Multimeter
Ω
0642_X_S
99
–
–
Fig. 44
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