Daikin RZQ71KAVLT User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Outdoor Unit
Inverter
Pair Type
3 HP Class
Si281314E

Service Manual
Removal Procedure
Outdoor Unit
Applicable Models
zHeat Pump
RZQ71KAVLT

Si281314E
Removal Procedure 1
Table of Contents
1. Procedure to Remove Outside Panels and Related Parts ......................2
2. Procedure to Remove Propeller Fan and Fan Motor ..............................3
3. Procedure to Remove Switch Box ..........................................................4
4. Procedure to Remove PCB Assy (1).......................................................5
5. Procedure to Remove Assy (2)...............................................................6
6. Procedure to Remove Assy (3)...............................................................7
7. Procedure to Remove Low Pressure Thermistor,
Electronic Expansion Valve, and Others.................................................8
8. Procedure to Remove Thermistor ...........................................................9
9. Procedure to Remove Four Way Valve.................................................10
10.Procedure to Remove Compressor.......................................................11

Procedure to Remove Outside Panels and Related Parts Si281314E
2Removal Procedure
1. Procedure to Remove Outside Panels and Related
Parts
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 front panel
2 (the front panel of the
side panel), after
removing the 1 screw
and pushing the front
panel downward.
2Remove the top panel,
after removing the 8
screws.
3Remove the front panel
1, after removing the 7
screws.
4Remove the right side
panel, after removing
the 5 screws.
5Remove the front panel
of the piping cover,
after removing the 1
screw.
6Remove the side panel
of the piping cover,
after removing the 4
screws.
7Hold the lower part (2
positions) and pull
frontward. Remove
from the top hooks
using a flathead
screwdriver etc. and
then pull downward the
whole suction grille to
remove it.
Front panel 2
Front panel 1
Suction grille
Top panel
Hooks
Right
panel
Side panel of
piping cover
Front panel of
piping cover

Si281314E Procedure to Remove Propeller Fan and Fan Motor
Removal Procedure 3
2. Procedure to Remove Propeller Fan and Fan
Motor
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 front panel 2,
following the procedure
indicated at "Removal of
Outside Panels and
Related Parts".
1. Remove the propeller fan
1Remove the 4 screws
that fix the discharge
grille. Remove from 4
hooks at upper and
lower side and then
remove the discharge
grille.
2Remove the fan setting
nut that fixes the
propeller fan.
3∗Remove the top
panel, following the
procedure indicated
at "Removal of
Outside Panels and
Related Parts".
2. Remove the fan motor In case of removing the
connector, do not pull the
lead wire. Hold the
connector part and press the
hook.
Precaution for the motor
installation:
Be sure to fix the lead wire of
the motor. Otherwise the
lead wire might be entangled
with the motor and causes
failure.
1Remove the connector
for the fan motor from
the printed wiring board
(PWB). (Refer to ∗1)
2Remove the 3 clamps
which fix the lead wire.
(3 hooks of partition
plate)
3Remove the 3 screws
of the front panel and
then pull lead wire
frontward.
4Pull out the fan motor,
after removing the 4
fixing bolts.
Propeller fan
Fan setting nut
Hooks
Hooks
Discharge grille
Connector for fan motor (X106A)
4 bolts
Clamp
Lead wire Propeller fan

Procedure to Remove Switch Box Si281314E
4Removal Procedure
3. Procedure to Remove Switch 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 front panel,
the suction grille, the top
panel, the side panel, and
the piping cover, following
the procedure indicated at
"Removal of Outside
Panels and Related
Parts".
Precaution for the
installation of the switch box:
After restoring each part, fix
each lead wire with the
clamps in the same way as
originally fixed.
1Remove the wirings to
the switch box and the
related parts
Remove the
connectors below;
• Fan motor
(X106A)
• Pressure
thermistor (X17A)
• Coil of four way
valve (X25A)
• Compressor relay
(X502A)
Remove the parts
below;
• Coil of motor
operated valve
(Y1E)
• Liquid pipe
thermistor (R6T)
• Suction pipe
thermistor (R3T)
• Discharge pipe
thermistor (R2T)
• Outdoor air
thermistor (R1T)
• Heat exchange
thermistor (R4T)
• Thermistor at the
midpoint of heat
exchange (R5T)
∗When removing, cut
the clamps that fix
each lead wire of
each part.
2Removing the switch
box
Remove 2 screws
that fix the switch
box.
Holding the switch
box, lift upward and
remove the 2 hooks
(1 right and 1 left)
and then pull out.
R6T Y1E
Fan motor (X106A)
R1T
R2T
R3T
R5T
R4T
For pressure
thermistor
(X17A)
For four way
valve coil
(X25A)
For compressor
relay (X502A)
Hook
Hook
Fixing screws

Si281314E Procedure to Remove PCB Assy (1)
Removal Procedure 5
4. Procedure to Remove PCB Assy (1)
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,
the front panel 2, the side
panel, and the piping
cover, following the
procedure indicated at
"Removing Outside
Panels and Related
Parts".
Remove the switch box,
following the procedure
indicated at "Removing
switch box".
1. Remove the PCB for the
display (A2P)
1Remove the
connectors (X205A)
on the PCB for the
display.
Since the PCB for
the display (A2P) is
fixed with 2 hooks,
take from them and
then remove the
PCB for the display.
PCB for the display (Retrieved)
Installation section of the
PCB for the display (A2P)
PCB for the display
Outdoor unit
PCB
Hooks
Connector
(X205A)
Hook PCB
Resin case

Procedure to Remove Assy (2) Si281314E
6Removal Procedure
5. Procedure to Remove Assy (2)
Procedure Warning Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Step Procedure Points
2. Remove the mounting
plate for the electric
component
After removing the mounted electric component
1Remove the mounting
plate for the terminal
block, after removing
the 1 screw.
2Remove the 2
connectors on the
reactor.
3Cut 3 clamps that fix the
wiring.
4Remove the mounting
plate for the electric
component after
removing the 2 screws. (cf)
Fixing screws
Fixing screw
Connectors
Reactor
Clamps
Mounting plate for the
electric component
Mounting plate for
the terminal block
X6A
X21A
X5A
X13A
X11A X41A
X17A
X25A X77A X803A
X12A
X106A X11A
LB
E
LA
NA
LC
W
V
U
DB501
IPM501
DB502
D531
D532
Q501

Si281314E Procedure to Remove Assy (3)
Removal Procedure 7
6. Procedure to Remove Assy (3)
Procedure Warning Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Step Procedure Points
3. Remove the assembly of
the PCB (AIP)
Assembly of the PCB (Retrieved)
1Remove the connectors
on the PCB.
2Remove the 1 screw
that fixes the electric
component to the
mounting plate.
3Pull out the assembly of
the PCB, after removing
from the hooks at the
both sides (9 locations).
Hooks
Hooks
Fixing screw
X6A
X21A
X5A
X13A
X11A X41A
X17A
X32A
X25A X77A X803A
X12A
X106A X11A
LB
E
LA
NA
LC
W
V
U
DB501
IPM501
DB502
D531
D532
Q501

Procedure to Remove Low Pressure Thermistor, Electronic Expansion Valve, and Others Si281314E
8Removal Procedure
7. Procedure to Remove Low Pressure Thermistor,
Electronic Expansion Valve, and Others
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 outside
panels, their parts, and
the switch box, following
the procedure indicated at
"Removal of Outside
Panels and Related Parts"
and other instructions.
Be sure to collect the
refrigerant first, before
removing the main unit of the
motor operated valve.
Precaution for the mounting
of the coil of the motor
operated valve
1. Remove the pressure
thermistor
1Remove the connector
for the pressure
thermistor (X17A).
2Remove the pressure
thermistor after cutting
off the brazing (1
location).
2. Remove the pressure
switch
1Remove the lead wire.
2Remove the pressure
switch after cutting off
the brazing.
3. Remove the electronic
expansion valve
1Pull out the coil from the
electronic expansion
valve upward.
2Cut the brazing (2
locations) and remove
the body of the
electronic expansion
valve.
(Replace with the
assembly of the
electronic expansion
valve)
Pressure thermistor
Brazing
Pressure
switch
Coil of electronic
expansion valve
Body of electronic
expansion valve
Clip
Press the coil into tube until the
clip completely fits in the tube.