Mitsubishi Electric PLFY Series Technical & Service Manual page 30

OPERATING PROCEDURE
4. Removing the room temperature thermistor (TH21)
(1) Remove the electrical box cover. (See Photo 1 and 2)
(2) Disconnect the connector CN20 (Red) from the indoor
controller board.
(3) Remove the room temperature thermistor with its holder.
(See Photo 4)
5. Removing the indoor controller board (I.B)
(1) Remove the electrical box cover. (See Photo 1 and 2)
(2) Disconnect the connectors:
CNMF (White) for fan motor
CNV (White) for vane motor
CN5Y (White) for motor for i-see Sensor (Option)
CN4Z (White) for sensor for i-see Sensor (Option)
CN90 (White) for signal receiver (Option)
CNP (White) for drain pump
CN4F (White) for float switch
CN44 (White) for thermistor (TH22/TH23)
CN01 (Black) for Indoor/Outdoor connecting line
CN3C (Blue) for Indoor/Outdoor transmission
Disconnect the connectors for optional parts, if any.
(3) Disconnect the lead wire connected to the TB5 on the
indoor controller board.
TB5: M-NET transmission connecting wire
(4) For the unit controlled with the wireless remote controller,
disconnect the lead wire connected to the TB15 on the
indoor controller board.
(5) Remove the indoor controller board (3 holders/4 hooks).
(See Photo 5)
TCH124A
PHOTOS/FIGURES
Photo 3
Indoor
controller board
Electrical box
Electrical box fixing
screws (M5 ×10)
Photo 4
Photo 5
30
Room temperature
detection thermistor
CN20
Electrical box fixing
screws (M5 × 10)
Thermistor (TH1)
Thermistor holder
Holders
Hooks