Daikin 3 HP Series User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Outdoor Unit
Inverter
Pair Type
3 HP Class
Si281308

Service Manual
Removal Procedure
Outdoor Unit
Applicable Models
zHeat Pump
RZQ72KMV2C

Si281308
Removal Procedure 1
Table of Contents
1. Procedure to Remove Panels and Plates ...............................................2
2. Procedure to Remove Fan Motor / Propeller Fan ...................................6
3. Procedure to Remove El. Compo. Box .................................................10
4. Procedure to Remove PCB...................................................................15
5. Procedure to Remove Sound Blanket...................................................18
6. Procedure to Remove Four Way Valve.................................................20
7. Procedure to Remove Electronic Expansion Valve...............................21
8. Procedure to Remove Compressor.......................................................23

Procedure to Remove Panels and Plates Si281308
2Removal Procedure
1. Procedure to Remove Panels and Plates
Procedure Warning Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Step Procedure Points
1. Remove the panels and
plates.
Take care not to cut your
finger by the fins of the heat
exchanger.
1Loosen the 4 screws
and lift the top panel.
2Loosen the 4 screws
and remove the
discharge grille.
Top panel
Outdoor air thermistor
Heat
exchanger
Discharge grille

Si281308 Procedure to Remove Panels and Plates
Removal Procedure 3
The front grille has 4 hooks.
Slide the discharge grille
upwards and remove it.
3Loosen the 6 screws of
the front panel.
4Press the front panel
and undo the hooks.
Lift the clamp plate and
remove it.
Step Procedure Points
Front panel
Clamp plate
Press the
front panel.
Lift the clamp
plate upwards.

Procedure to Remove Panels and Plates Si281308
4Removal Procedure
5Undo the left side
hooks, and then the
right side hook.
Remove the front panel.
Lift the front panel and
remove it while pushing the
left side panel inwards.
Lift the front panel and undo
the right side hook.
Fit the right side of the front
panel first when installing.
Step Procedure Points

Si281308 Procedure to Remove Panels and Plates
Removal Procedure 5
2. Remove the stop valve
cover.
1Loosen the screw of the
stop valve cover.
2Pull down the stop
valve cover to undo the
hooks and remove it.
The stop valve cover has 6
hooks.
Step Procedure Points
Stop valve cover

Procedure to Remove Fan Motor / Propeller Fan Si281308
6Removal Procedure
2. Procedure to Remove Fan Motor / Propeller Fan
Procedure Warning Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Step Procedure Points
Remove the top panel
and the front panel.
1. Remove the el. compo.
box cover.
This procedure is not
necessary to remove the
propeller fan only.
1Loosen the screw on
the back of the shelter.
2Undo the 2 hooks and
remove it.
The hooks have been
released since the front
panel was removed.
3Release the 4 hooks of
the el. compo. box
cover and remove it.
Shelter
Hooks
El. compo.
box cover

Si281308 Procedure to Remove Fan Motor / Propeller Fan
Removal Procedure 7
2. Remove the fan motor.
1Disconnect the
connector for fan motor
(S70).
Step Procedure Points
S70

Procedure to Remove Fan Motor / Propeller Fan Si281308
8Removal Procedure
2The illustration shows
arrangement of the fan
motor lead wire.
3Unscrew the washer-
fitted nut (M10) of the
propeller fan with a
spanner.
Align mark of the
propeller fan with D-cut
section of the motor shaft
when reassembling.
Step Procedure Points
Fan motor
lead wire
Propeller fan

Si281308 Procedure to Remove Fan Motor / Propeller Fan
Removal Procedure 9
4Remove the 4 screws
from the fan motor.
5Pull the fan motor out. Put the lead wire through the
back of the motor when
reassembling (so as not to
be entangled with the
propeller fan).
Step Procedure Points
Fan motor

Procedure to Remove El. Compo. Box Si281308
10 Removal Procedure
3. Procedure to Remove El. Compo. Box
Procedure Warning Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Step Procedure Points
Remove the top panel
and the front panel.
1. Remove the shield plate.
1Loosen the 2 screws.
2Slide the cover upward
to undo the 1 hook on
the bottom left, and
then remove the plate.
3Disconnect the 2 power
supply cables and the 1
earth wire.
Shield
plate

Si281308 Procedure to Remove El. Compo. Box
Removal Procedure 11
4Disconnect the 2 earth
wires.
5Loosen the 3 screws of
the right side panel.
6Loosen the fixing screw
of the el. compo. box.
Step Procedure Points
Earth wires
Right
side
panel

Procedure to Remove El. Compo. Box Si281308
12 Removal Procedure
Insert the 2 hooks of the
lower part and the 1 hook of
the upper back when
reassembling.
7Disconnect the relay
harness for fan motor.
8Disconnect the
connectors of the front
side.
S20: electronic
expansion valve
S40: overload protector
S80: four way valve
S90: thermistors
(discharge pipe,
outdoor air, heat
exchanger)
Step Procedure Points
Hook
Hooks
S40 S20 S90 S80

Si281308 Procedure to Remove El. Compo. Box
Removal Procedure 13
9Disconnect the relaying
wire connector for the
compressor.
10 Release the clamp by
pliers.
11 Release the clamp and
undo the wire from the
hook.
Step Procedure Points
Clamp
Hook

Procedure to Remove El. Compo. Box Si281308
14 Removal Procedure
12 Lift the el. compo. box
and remove it.
Step Procedure Points
El. compo. box

Si281308 Procedure to Remove PCB
Removal Procedure 15
4. Procedure to Remove PCB
Procedure Warning Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Step Procedure Points
Remove the el. compo.
box.
1. Remove the PCB.
1Disconnect the
connectors for the
control PCB (S52,
S102).
2Undo the 4 clamps by
pliers.
3Loosen the fixing screw
of the cable way board
and disconnect the
earth wire.
S52 S102
Clamps
Earth wire

Procedure to Remove PCB Si281308
16 Removal Procedure
4Undo the hook on the
right.
5Open the cable way
board.
6Disconnect the
harnesses.
1: Black
2: White
3: Red
L1: Black
L2: Brown
N1: White
N2: Blue
7Disconnect the 2
harnesses for the
reactor (HR1, HR2).
Step Procedure Points
123 L1 N1
N2
L2
HR1 HR2

Si281308 Procedure to Remove PCB
Removal Procedure 17
8Loosen the 3 fixing
screws for the main
PCB.
9Undo the 4 hooks.
10 Lift up and remove the
PCB.
Step Procedure Points
Hooks

Procedure to Remove Sound Blanket Si281308
18 Removal Procedure
5. Procedure to Remove Sound Blanket
Procedure Warning Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Step Procedure Points
1Remove the sound
blanket (back).
2Remove the sound
blanket (outer).
Since the piping ports on the
sound blanket (outer) are
torn easily, remove the
blanket carefully.
3Remove the sound
blanket (top-upper).
Sound
blanket
(back)
Sound
blanket
(outer)
Sound blanket
(top-upper)