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.

Si281314E Procedure to Remove Thermistor
Removal Procedure 9
8. Procedure to Remove Thermistor
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,
the right side panel, and
the piping cover, following
the procedure indicated at
"Removal of Outside
Panels and Related
Parts".
The discharge pipe thermistor, the suction pipe
thermistor, the heat exchange distributor
thermistor, and the thermistor for the midpoint of
the heat exchange are connected to the 1
common connector. When replacing, you have to
replace all 4 thermistors at once.
1Remove the outdoor air
thermistor, pulling
forward and then sliding
it to the right.
2Pull out the discharge
pipe thermistor (∗1) by
picking and pulling out
the mounting spring.
3Pull out the suction pipe
thermistor by pushing
the fixing part.
4Since the thermistor of
the heat exchange
distribution pipe is fixed
with the clamp plate,
pull the clamp plate
forward in order to
remove the thermistor.
5Remove the thermistor
at the midpoint of heat
exchange by pushing
the fixing part.
6Pull out the liquid pipe
thermistor by pushing
the fixing part.
Thermistor
Thermistor
Discharge pipe thermistor
(R2T)
Suction pipe thermistor
(R3T)
Liquid pipe thermistor
(R6T)
Thermistor for the
midpoint of heat exchange
(R5T)
Outdoor air thermistor
(R1T)
Heat exchange thermistor
(R4T)

Procedure to Remove Four Way Valve Si281314E
10 Removal Procedure
9. Procedure to Remove Four Way Valve
Procedure Warning Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Step Procedure Points
Collect the refrigerant.
Remove the outside
panels, their parts, and
switch box, following the
procedure indicated at
"Removing Outside
Panels and Related Parts"
and other instructions.
Be sure to confirm that the
refrigerant is completely
collected before starting the
work.
Protect other pipings using a
protective sheet for the
welding or steel plate so that
the flame for the gas welding
may not damage them.
When brazing, cool down the
main unit using a wet waste
etc. so that the temperature
of the main unit may not get
higher than 120 °C.
1Remove the four way
valve after removing the
1 screw.
2Remove the main unit
of the four way valve
after cutting off the
brazing (4 locations).
Screw Brazing
Coil for the four
way valve

Si281314E Procedure to Remove Compressor
Removal Procedure 11
10.Procedure to Remove Compressor
Procedure Warning Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Step Procedure Points
Collect the refrigerant.
Remove the outside
panels, their parts, and
the switch box, following
the procedure indicated at
"Removing Outside
Panels and Related Parts"
and other instructions.
Be sure to confirm that the
refrigerant is completely
collected before starting the
work.
The color of each terminal
One of the fixing nuts of the
compressor is located at the
outer side of the partition
plate.
1Remove the fixing plate
for the stop valve after
removing the 5 screws.
2Remove the sound
insulation (1).
3Remove the terminal
cover, after pushing the
projective parts from
the both sides.
4Remove the lead wire
from the terminal (2).
5Pull out the sound
insulation by unwinding
the strings (2 locations).
6Remove the nuts that
fix the compressor. (All
the equipments are
fixed with 3 nuts).
7Cut off the brazing (2
locations).
8Pull out the compressor
by lifting upward.
Fixing nuts
Fixing plate for the stop valve
Brazing
Sound insulation (1)
Sound insulation (2)
String
Terminal cover
VU
W
U: Red V: White W: Blue
Rubber bush
Glass terminal

Revision History
Month / Year Version Revised contents
06 / 2013 Si281314E First edition

Head Office:
Umeda Center Bldg., 2-4-12, Nakazaki-Nishi,
Kita-ku, Osaka, 530-8323 Japan
Tokyo Office:
JR Shinagawa East Bldg., 2-18-1, Konan,
Minato-ku, Tokyo, 108-0075 Japan
http://www.daikin.com/global_ac/
All rights reserved
c
Warning
zDaikin products are manufactured for export to numerous countries throughout the world. Prior to
purchase, please confirm with your local authorised importer, distributor and/or retailer whether this
product conforms to the applicable standards, and is suitable for use, in the region where the product
will be used. This statement does not purport to exclude, restrict or modify the application of any local
legislation.
zAsk a qualified installer or contractor to install this product. Do not try to install the product yourself.
Improper installation can result in water or refrigerant leakage, electrical shock, fire or explosion.
zUse only those parts and accessories supplied or specified by Daikin. Ask a qualified installer or
contractor to install those parts and accessories. Use of unauthorised parts and accessories or
improper installation of parts and accessories can result in water or refrigerant leakage, electrical
shock, fire or explosion.
zRead the User's Manual carefully before using this product. The User's Manual provides important
safety instructions and warnings. Be sure to follow these instructions and warnings.
If you have any enquiries, please contact your local importer, distributor and/or retailer.
Cautions on product corrosion
1. Air conditioners should not be installed in areas where corrosive gases, such as acid gas or alkaline gas, are produced.
2. If the outdoor unit is to be installed close to the sea shore, direct exposure to the sea breeze should be avoided. If you need to install
the outdoor unit close to the sea shore, contact your local distributor.
Organization:
DAIKIN INDUSTRIES, LTD.
AIR CONDITIONING MANUFACTURING DIVISION
Scope of Registration:
THE DESIGN/DEVELOPMENT AND MANUFACTURE OF
COMMERCIAL AIR CONDITIONING, HEATING, COOLING,
REFRIGERATING EQUIPMENT, HEATING EQUIPMENT,
RESIDENTIAL AIR CONDITIONING EQUIPMENT, HEAT
RECLAIM VENTILATION, AIR CLEANING EQUIPMENT,
COMPRESSORS AND VALVES.
Organization:
DAIKIN INDUSTRIES
(THAILAND) LTD.
Scope of Registration:
THE DESIGN/DEVELOPMENT
AND MANUFACTURE OF AIR
CONDITIONERS AND THE
COMPONENTS INCLUDING
COMPRESSORS USED FOR THEM
All of the Daikin Group’s business
facilities and subsidiaries in Japan
are certified under the ISO 14001
international standard for
environment management.
JMI-0107 JQA-1452
Dealer
z
Specifications, designs and other content appearing in this brochure are current as of June 2013 but subject to change without notice.
Si281314E
06/2013 AK