Daikin Si12-992 User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Outdoor Unit
Inverter
Multi Type
4.0/5.0 kW Class
Si12-992

Service Manual
Removal Procedure
Outdoor Unit
zHeat Pump
2MXU40GV1B
2MXU50GV1B

Si12-992
Removal Procedure 1
Table of Contents
1. Removal of Humidifier Unit .....................................................................2
2. Removal of Heater ASSY / Humidifying Rotor
(Moisture Adsorption Element) / Humidifying Rotor Motor......................5
3. Removal of Damper Motor ......................................................................9
4. Removal of Limit Switch / Humidifying Thermistor................................11
5. Removal of Fan-valve-duct ASSY.........................................................14
6. Removal of Hygroscopic Fan Rotor / Hygroscopic Fan Motor ..............16
7. Removal of Panels and Plates ..............................................................17
8. Removal of Electrical Box .....................................................................20
9. Removal of PCB....................................................................................25
10.Removal of Sound Blankets..................................................................31
11.Removal of Propeller Fan / Fan Motor ..................................................34
12.Removal of Thermistors ........................................................................37
13.Removal of Compressor .......................................................................39
14.Removal of Four Way Valve / Electronic Expansion Valve...................41
Note: The illustrations may be slightly different depending on the model.

Removal of Humidifier Unit Si12-992
2Removal Procedure
1. Removal of Humidifier Unit
Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies
before disassembling work.
Step Procedure Points
1. External appearance
2. Removal of the humidifier
unit
1Remove the 4 screws
and lift up the top panel
to remove.
}
(R9880)
Humidifier unit
Air outlet
(R9881)
Air inlet
(R9882)
Top panel

Si12-992 Removal of Humidifier Unit
Removal Procedure 3
2Remove the screw,
and the hose cover.
3Take out the
humidifying hoses.
4The figure shows the
arrangement of the
relay harness.
Be sure to wait 10 minutes
or more after turning off the
power supply before
disconnecting the
connectors.
Step Procedure Points
(R9883)
Hose cover
(R9884)
Humidifying hose
(R9885)

Removal of Humidifier Unit Si12-992
4Removal Procedure
5Disconnect the 4 relay
connectors.
Do not pull the harnesses
from the outdoor unit
strongly so as not to loose
the hook of the mounting
plate.
(See the illustration below
on this page for the
mounting plate.)
6Disconnect the
connector for humidifier
fan motor.
Be sure to wait 10 minutes
or more after turning off the
power supply before
disconnecting the
connectors.
Pull out the connector while
pushing up the hook on the
bottom side.
When lifting up the
humidifier unit, be careful
not to pull the relay
harnesses forcibly.
When reassembling the
humidifier unit, make sure
the mounting plate is
hooked (refer to page 21)
and do not forget to connect
the relay connectors.
7Remove the 4 screws
of the humidifier unit
and lift it up to remove.
Step Procedure Points
(R9886)
Relay connectors
(R9887)
Humidifier
fan motor
(R5796)
<From the back side>
}
(R9888)
Humidifier unit
Mounting plate
Hook

Si12-992 Removal of Heater ASSY / Humidifying Rotor (Moisture Adsorption Element) / Humidifying Rotor Motor
Removal Procedure 5
2. Removal of Heater ASSY / Humidifying Rotor
(Moisture Adsorption Element) / Humidifying
Rotor Motor
Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies
before disassembling work.
Step Procedure Points
Internal structure of the
humidifier unit
Preparation
Remove the top panel
according to "Removal of
Humidifier Unit".
The humidifying rotor is
located under the heater
ASSY and the duct.
1. Removal of the heater
ASSY
1Remove the 4 screws
of the duct on
adsorption side.
(R9889)
Duct (adsorption side)
Heater
ASSY
Humidifying
rotor motor
Harness ASSY
Limit switch
Damper
motor
Humidifying thermistor
Fan-valve-duct ASSY
(R9890)

Removal of Heater ASSY / Humidifying Rotor (Moisture Adsorption Element) / Humidifying Rotor Motor Si12-992
6Removal Procedure
2Detach the harness for
heater from the groove.
3Remove the duct.
4Release the lead wire
for humidifying rotor
motor from 2 hooks.
Step Procedure Points
(R9891)
(R9892)
Duct (adsorption side)
(R9893)

Si12-992 Removal of Heater ASSY / Humidifying Rotor (Moisture Adsorption Element) / Humidifying Rotor Motor
Removal Procedure 7
5Remove the 2 screws
to remove the heater
ASSY.
Do not dismount the heater
ASSY.
2. Removal of the
humidifying rotor.
1Detach the lead wire
for fan motor from the
groove.
2Remove the bell mouth
on adsorption side.
Step Procedure Points
(R9894)
(R9898)
Fan motor lead wire
(R9899)
Bell mouth

Removal of Heater ASSY / Humidifying Rotor (Moisture Adsorption Element) / Humidifying Rotor Motor Si12-992
8Removal Procedure
3Lift the humidifying
rotor up to remove.
A heat catalyst (black) is
applied on the upper side.
3. Removal of the
humidifying rotor motor
1Disconnect the
connector for the
humidifying rotor
motor.
2Remove the 2 screws
of the humidifying rotor
motor.
Step Procedure Points
(R9900)
Humidifying rotor
(R9901)
(R9902)
Humidifying rotor
motor
Rotor driving
part