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

Si12-992 Removal of Damper Motor
Removal Procedure 9
3. Removal of Damper Motor
Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies
before disassembling work.
Step Procedure Points
1. Removal of the damper
motor
Disconnect the connector
for the humidifying rotor
motor. (Refer to page 8.)
1Disconnect the
connector for the
damper motor.
(R10348)
Harness ASSY
Damper
motor
Humidifying thermistor
(R0232)

Removal of Damper Motor Si12-992
10 Removal Procedure
2Remove the 2 screws.
3Remove the damper
motor.
Step Procedure Points
(R0233)
(R0234)

Si12-992 Removal of Limit Switch / Humidifying Thermistor
Removal Procedure 11
4. Removal of Limit Switch / Humidifying Thermistor
Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies
before disassembling work.
Step Procedure Points
1. Removal of the limit switch
1Open the hooks.
(R10812)
Harness ASSY
Limit switch
(R0235)

Removal of Limit Switch / Humidifying Thermistor Si12-992
12 Removal Procedure
2Push up the limit switch
with a flat screwdriver.
3Disconnect the
terminals.
4Release the harness
from the hooks and
remove the harness
ASSY.
Step Procedure Points
(R0236)
Limit
switch
(R0237)
(R0238)
(R0239)

Si12-992 Removal of Limit Switch / Humidifying Thermistor
Removal Procedure 13
2. Removal of the
humidifying thermistor
When replacing the
humidifying thermistor,
order a seal material
together.
1Peel off the seal
material.
2Pull out the humidifying
thermistor.
When reassembling, put the
harness through under the
limit switch cover.
Step Procedure Points
(R0245)
(R10548)
(R10547)
Limit switch cover

Removal of Fan-valve-duct ASSY Si12-992
14 Removal Procedure
5. Removal of Fan-valve-duct ASSY
Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies
before disassembling work.
Step Procedure Points
Preparation
Remove the heater ASSY
and the humidifying rotor.
The humidifying rotor is
located under the heater
ASSY and the duct.
1Remove the 7 screws
of the fan-valve-duct
ASSY.
Do not dismantle the fan-
valve-duct ASSY.
Replace it as a unit.
(R10349)
Duct (adsorption side)
Heater
ASSY
Humidifying
rotor motor
Harness ASSY
Fan-valve-duct ASSY
(R0242)
Fan-valve-duct ASSY

Si12-992 Removal of Fan-valve-duct ASSY
Removal Procedure 15
2Release the 2 hooks on
the right side.
Release the hooks while
bending the right side panel.
3Lift up the fan-valve-
duct ASSY to remove.
Step Procedure Points
(R0243)
(R0244)
Fan-valve-duct ASSY

Removal of Hygroscopic Fan Rotor / Hygroscopic Fan Motor Si12-992
16 Removal Procedure
6. Removal of Hygroscopic Fan Rotor / Hygroscopic
Fan Motor
Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies
before disassembling work.
Step Procedure Points
1. Removal of the
hygroscopic fan rotor
ASSY
Preparation
Remove the humidifying
rotor according to "Removal
of Humidifying Rotor".
1Disconnect the
connector for fan motor
and remove the bell
mouth on adsorption
side.
2Unscrew the fan fixing
nut (M6) of the
hygroscopic fan rotor
ASSY (sirocco fan rotor
ASSY) and remove.
When reassembling, align
the mark of the outdoor
fan with the D-cut section of
the motor shaft.
Wrench size: 10mm
2. Removal of the
hygroscopic fan motor
Lift the motor cover first and
pull out.
1Remove the 3 screws
of the motor cover.
2Remove the
hygroscopic fan motor.
(R9928)
(R5821)
Fan fixing
nut Hygroscopic
fan rotor
ASSY
(R5822)
(R5824)
(R5823)
Hygroscopic
fan motor
Motor cover

Si12-992 Removal of Panels and Plates
Removal Procedure 17
7. Removal of Panels and Plates
Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies
before disassembling work.
Step Procedure Points
1External appearance. Remove the humidifying
unit.
Do not release the mounting
plate at this point.
2Remove the 8 screws
to remove the front
panel.
The front panel has 4 hooks.
The bell mouth can not be
removed.
(R9929)
(R9930)
Room A
Room B
Outdoor air thermistor
Liquid side
Gas side
Room A
Room B
(R9931)

Removal of Panels and Plates Si12-992
18 Removal Procedure
3Remove the 4 screws
of the discharge grille.
4Release the 4 hooks
and remove the
discharge grille.
When reassembling, make
sure to fit the 4 hooks.
5Remove the 2 screws
of the stop valve cover
and remove it.
Step Procedure Points
(R10345)
(R9932)
(R9933)
Stop valve cover