Operation Procedure - Mitsubishi Electric PKFY-P12NHMU-E Technical & Service Manual

OPERATION PROCEDURE

3. REMOVING THE INDOOR CONTROLLER BOARD
AND WIRELESS CONTROLLER BOARD
(1) Remove the front panel. (Refer to 2.)
(2) Remove the room temp. thermistor TH1. (see Photo 3)
(3) Remove the electrical box covers (screw 4 × 12).
(See Photo 3)
(4) Disconnect the connectors on the indoor controller board.
(5) Remove the switch board cover.
(6) Pull out the indoor controller board toward you, then
disconnect the rest of connectors.
Remove the indoor controller board and switch board.
(7) Remove the holder of wireless controller board.
(8) Disconnect the connector of wireless controller board and
remove the wireless controller board from the holder.
Screw of electrical box
Photo 5
side cover & clamp
(45)
Clamp
4. REMOVING THE ELECTRICAL BOX
(1) Remove the front panel. (Refer to 2.)
(2) Remove the electrical box covers. (See Photo 3)
(3) Remove the nozzle assembly. (Refer to 5.)
(4) Disconnect the transmission wiring of TB5.
(5) Disconnect the power supply wiring of TB2.
(6) Disconnect the wiring of MA-remote controller (TB15).
(7) Disconnect the connectors on the indoor controller board.
(8) Disconnect the connector for the ground wire. (See Photo 6)
(9) Pull the disconnected lead wire out from the electrical box.
(10) Remove the screw of electrical box. (See Photo 7)
(11) Push up the upper fixture (See Photo 6) catch to remove
the box, then pull the right fixture (See Photo 4) and
remove it from the box fixture.
Room temp.
thermistor
(TH21)
Electrical box
side cover
Caution:
In the case that room temp. thermis-
tor is fixed with the screw of electrical
box side cover, keep 45mm (1-3/4 inch)
between the bottom end of clamp and
the top of room temp. thermistor as
Photo 5.
Electrical box cover (top) Electrical box
Photo 3
Screw (side cover)
Screw (top cover)
Nozzle assembly Switch board cover
Photo 4
Terminal
block (TB2)
Terminal
block (TB5)
Terminal
block (TB15)
Fixture
(right)
Room temp. thermistor (TH21)
Photo 6
Connector for
ground wire
Photo 7
Screw (Electrical box)
22
PHOTOS
cover (side)
Room temp.
thermistor
(TH21)
Screw
(side
cover)
Holder of wireless
controller board
Indoor controller board (I.B)
Fixture
(right)
Fixture
(upper)