Mitsubishi Electronics PAC-AKA51BC User Manual

81

  1. Removing the service panel and top panel
 

(1) Remove 3 service panel fixing screws (5 × 10) and slide 

 

     the hook on the right downward to remove the service 

 

     panel.

 

(2) Remove screws (3 for front, 3 for rear/5 × 10) of the top 

 

     panel and remove it.

  2. Removing the fan motor (MF1, MF2)
 

(1) Remove the service panel. (See Figure 1)

 

(2) Remove the top panel. (See Figure 1)

 

(3) Remove 5 fan grille fixing screws (5 × 10) to detach the 

 

     fan grille. (See Figure 1)

 

(4) Remove a nut (for right handed screw of M6) to detach 

 

     the propeller. (See Photo 1)

 

(5) Disconnect the connectors, CNF1 and CNF2 on controller 

 

     circuit board in electrical parts box.

 

(6) Remove 4 fan motor fixing screws (5 × 25) to detach the 

 

     fan motor. (See Photo 2) 

  3. Removing the electrical parts box
 

(1) Remove the service panel. (See Figure 1)

 

(2) Remove the top panel. (See Figure 1)

 

(3) Disconnect the indoor/outdoor connecting wire and power 

supply wire from each terminal block.

 (4) 

Remove all the following connectors from controller circuit board; 

 

     fan motor, thermistor <Outdoor pipe>, thermistor <Discharge>, 

 

     thermistor <Outdoor 2-phase pipe>, thermistor <Outdoor>, 

 

     high pressure switch, high pressure sensor, low pressure 

 

     switch, solenoid valve coil <4-way valve> and solenoid 

 

     valve coil <Hot gas bypass>, solenoid valve coil 

 

     <Returning oil bypass>.

 

     Then remove a screw (4 × 8) from the valve bed to remove 

 

     the lead wire.

 

     Pull out the disconnected wire from the electrical parts box.

 

<Diagram symbol in the connector housing>

 

• Fan motor (CNF1, CNF2) 

 

• Thermistor <Outdoor pipe> (TH3) 

 

• Thermistor <Discharge> (TH4) 

 

• Thermistor <Outdoor 2-phase pipe, Outdoor> (TH7/6) 

 

• High pressure switch (63H) 

 

• High pressure sensor (63HS) 

 

• Low pressure switch (63L) 

 

• Solenoid valve coil <4-way valve> (21S4) 

 

• Solenoid valve coil <Bypass valve> (SV1)

 

• Solenoid valve coil (Returning oil bypass)

 

  <Bypass valve> (SV2)

 

(5) Remove the terminal cover and disconnect the 

 

     compressor lead wire.

  (6) Remove an electrical parts box fixing screw (4 × 10) and 

detach the electrical parts box by pulling it upward. The 

electrical parts box is fixed with 2 hooks on the left and 1 

hook on the right.

Nut

Fan motor fixing screws

Fan 
motor

Fan motor fixing screws

Propeller

Front panel

Top panel fixing screws

Top panel

Service panel

fixing screws

Service panel

Grille 

fixing 

screws

Fan grille

Grille 

fixing 

screws

Slide

Electrical 
parts box

Controller circuit board

(C.B.)

Electrical parts 

box fixing screw

Terminal cover

Cover panel 
(Front)

Cover panel fixing screws

Compressor

(MC)

Terminal block
(TB1) (TB2)

Valve bed

Screw