Daikin RXMQ4PVE User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Outdoor Unit
Inverter
Multi Type
4/5/6 HP Class
Si341211

Service Manual
Removal Procedure
Outdoor Unit
Applicable Models
zCooling Only
RXMQ4PVE
RXMQ5PVE
RXMQ6PVE
RXMQ4PVEE
RXMQ5PVEE
RXMQ6PVEE
zHeat Pump
RXYMQ4PVE
RXYMQ5PVE
RXYMQ6PVE

Si341211
Removal Procedure 1
Table of Contents
1. Procedure to Remove Outside Panels....................................................2
2. Procedure to Remove PCB and Electrical Component Box ...................5
3. Procedure to Remove Propeller Fan and Fan Motor ............................12
4. Procedure to Remove Thermistor .........................................................14
5. Procedure to Remove Electronic Expansion Valve and
Peripheral Equipment............................................................................15
6. Procedure to Remove Four Way Valve.................................................19
7. Procedure to Remove Compressor.......................................................20

Procedure to Remove Outside Panels Si341211
2Removal Procedure
1. Procedure to Remove Outside Panels
Procedure Warning Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Step Procedure Points
1
2
3
4
5
Remove 8 screws of
the top panel.
Remove 1 screw of the
front panel (2), and then
remove the panel after
pushing it downward to
release the hook.
To remove the front
panel for piping cover,
remove its 1 screw.
To remove the side
panel for piping cover,
remove 4 screws of the
side panel.
To remove the side
panel, remove its 6
screws after removing
the outdoor air
thermistor.
It is possible to remove only
the front panel without
removing the top panel.
Hook
Top panel
Front panel
(2)
Front panel for
piping cover
Side panel
Side panel for
piping cover
Outdoor air
thermistor

Si341211 Procedure to Remove Outside Panels
Removal Procedure 3
Step Procedure Points
6 Remove the discharge
grill after removing its 4
screws and releasing its
4 hooks.
On the rear side of the front
panel (1), a reinforce plate is
attached. Be careful not to
lose it while removing the
front panel (1).
7 Remove the front panel
(1) after removing its 7
screws and pushing it
upward.
Front panel (1)
Discharge grill
Hook
Reinforce plate

Procedure to Remove Outside Panels Si341211
4Removal Procedure
Step Procedure Points
8 Remove the heat
exchanger cover after
releasing its 3 hooks
with a minus driver.
9 Remove the outdoor air
thermistor after pulling it
to the near side and
sliding to the right.
10 The figure in the right is
of rear side view.
Outdoor air
thermistor
(R1T)

Si341211 Procedure to Remove PCB and Electrical Component Box
Removal Procedure 5
2. Procedure to Remove PCB and Electrical
Component Box
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 2 fixing
screws (M5) of terminal
block mounting plate.
Preliminary preparation
Remove the top, front and
side panels according to the
"Procedure to Remove
Outside Panels".
2 Remove the fixing
screw (M5) above the
electrical component.
3 Release the hook of the
resin stay from the
terminal block mounting
plate.

Procedure to Remove PCB and Electrical Component Box Si341211
6Removal Procedure
Step Procedure Points
4 Cut off the wiring clamp
materials (3 places).
5 Disconnect the
connector set for the
reactor lead wire from
each other.

Si341211 Procedure to Remove PCB and Electrical Component Box
Removal Procedure 7
Step Procedure Points
6 Pull off the connector
for the motor lead wires
and then release the
wire from the hook of
resin casing.
7 Remove the wire
harnesses of the
solenoid valve and the
four way valve from the
fixing plate and then
remove the electrical
component.

Procedure to Remove PCB and Electrical Component Box Si341211
8Removal Procedure
Step Procedure Points
8 Remove the 2 securing
screws (M4) of
insulation sheet and
then release the lead
wires to the compressor
(blue, red and white
colors) and the lead
wires A1P to A3P (red
and blue colors) from
the hook of resin
casing.
9 Remove the 2 securing
screws (M4 and with
spring washers) for the
lead wires A1P to A3P
(red and blue colors)
and the condenser lead
wires (orange and ash
colors).

Si341211 Procedure to Remove PCB and Electrical Component Box
Removal Procedure 9
Step Procedure Points
10 Cut off the clamp
materials, for fixing the
compressor lead wires
(2 places) and the lead
wires A3P to X11 (red,
blue, and green colors)
(1 place).
Clamps (2 places) for the
compressor lead wires
Clamps for the lead wires A3P to
X11
11 Fold the hooks (2
places) and slide the
resin casing to the right
to remove the casing
from the electrical
component assembly.
Hooks

Procedure to Remove PCB and Electrical Component Box Si341211
10 Removal Procedure
Step Procedure Points
12 Pull off the PCB
connectors X66A, X81A
and X5A.
13 Pull off the reactor lead
wire connectors,
compressor lead wire
one and lead wire ones
X22A, X21A, X13A,
X11A, X12A, X18A,
X17A, X32A, X25A,
X26A, X27A and X28A,
by pulling them.
X66A X81A X5A
X66A
X81A
X5A
X22A
X21A
X13A
X11A
X18A
X17A
X32A
X25A X26A X27A X28A
X12A
Compressor lead
wire connector
Reactor lead
wire connectors

Si341211 Procedure to Remove PCB and Electrical Component Box
Removal Procedure 11
Step Procedure Points
14 Remove the fixing
screw (M4) at the top of
the PCB assembly.
15 Release the locking
engaging hook (2
places) at the rear side.
16 The figures in the right
are PCB assembly.
Hook
Fixing plate for the
PCB
The electrical component
mounting plate
The electrical component
mounting plate
Main PCB (A1P)
(for control)
PCB for cool/heat
selector (A4P)
Service PCB
(A2P)
Noise filter PCB
(A3P)

Procedure to Remove Propeller Fan and Fan Motor Si341211
12 Removal Procedure
3. 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
Preliminary preparation
Remove the discharge grill,
front panel and front panel
for piping cover, according to
the "Procedure to Remove
Outside Panels".
1Remove the nuts with a
washer, which fixing the
propeller fan.
Front panel (1)
Discharge
grill
Propeller fan
Nut with a washer

Si341211 Procedure to Remove Propeller Fan and Fan Motor
Removal Procedure 13
Step Procedure Points
2 Remove the clamp
material.
Pull off the connector while
supporting its body and
pushing the engaging click,
without pulling its lead wires.
Caution on mounting the
motor
If the motor lead wires are
not fixed by using the clamp
material, it may always
damage the lead wire
because the lead wires
twined around the fan.
When mounting the propeller
fan, make the D cut
correspond to the hole of the
fan.
3 Remove the 4 fixing
screws for fan motor
and then remove the
fan motor.
Earth wire
Clamp material
D cut
Mount the fan motor with its mark "z"
positioned toward the bottom.
Fan
motor
Lead wire for
fan motor
Lead wire Propeller fan

Procedure to Remove Thermistor Si341211
14 Removal Procedure
4. 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
1 For the details of the
removal of the
thermistor for outdoor
air temperature (R1T),
see the points to the
right.
Preliminary preparation
Remove the front panel (2)
and side panel according to
the "Procedure to Remove
Outside Panels".
2 Pull out the discharge
pipe thermistor after
inclining the mounting
spring outward.
[Procedure to remove thermistor
for outdoor air temperature]
3 Pull out the thermistor
for suction pipe 1 and
thermistor for suction
pipe 2, after inclining
the mounting spring
outward.
4 Pull out the subcooling
thermistor and
thermistor for liquid
pipe, after inclining the
mounting spring
outward.
5
6
Pull out the thermistor
for heat exchanger after
pulling the fixing metal
part.
Pull out the thermistor
for liquid pipe after
inclining the mounting
spring outward.
When passing the thermistor
for outdoor air temperature
gain through the outside
panel, do it through the hole
nearby attached with a
yellow color mark.
Thermistor for
suction pipe 1 (R3T)
Thermistor for heat
exchanger (R4T)
Thermistor for
subcooling (R6T)
Thermistor for liquid
pipe (R7T)
Hooks (2 places) Side panel
Side panel
Notch
Fixing plate for thermistor (R1T)
Stopper
Marking (yellow color)
Insert
direction
Thermistor for outdoor
air temperature
Thermistor for suction pipe 2 (R5T)
Thermistor for discharge pipe (R2T)

Si341211 Procedure to Remove Electronic Expansion Valve and Peripheral Equipment
Removal Procedure 15
5. Procedure to Remove Electronic Expansion Valve
and Peripheral Equipment
Procedure Warning Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work..
Step Procedure Points
1 Pull out the coils of
electronic expansion
valve (2 places).
2 Remove the pressure
sensors (2 places).
When removing the sensor,
be sure to use 2 spanners as
the left figure shows.
The pressure sensor is
equipped with a gauge joint
having a check valve.
Therefore, when loosing the
fixing nut of sensor, a
refrigerant leak is stopped.
Coil of main
electronic
expansion
valve (Y1E)
Coil of
subcooling
electronic
expansion
valve (Y3E)

Procedure to Remove Electronic Expansion Valve and Peripheral Equipment Si341211
16 Removal Procedure
Step Procedure Points
3 Pull off the lead wire of
high pressure switch.
4 Remove the coil of
solenoid valves (2
portions).
Loosen the fixing bolt above
the coil of solenoid valve and
then remove the coil.
Unloading solenoid valve (Y3S)
High pressure switch
Solenoid valve for
hot gas (Y2S)

Si341211 Procedure to Remove Electronic Expansion Valve and Peripheral Equipment
Removal Procedure 17
Step Procedure Points
Make sure that there is no
refrigerant gas left within
the refrigerant circuit
system before performing
the operation.
Precautions on mounting
Mount it by means of the
non-oxidation brazing
method.
If nitrogen gas is not
available, quickly operate to
mount it.
It is necessary to prevent the
packing from deterioration
due to the carbonization of oil
or the heat affection within
the four way valve. For this
purpose, avoid the heating of
the valve by wrapping its
body with wet cloth and then
supplying water to the cloth to
keep wet.
(Keeping a temperature of
120ºC or lower)
5 Disconnect the brazing
part of main body at
electronic expansion
valve at its soldered
portion.
6 Disconnect the brazing
part of main body at
pressure switch at its
soldered portion.
Be careful not to crash the
piping by over-pressing it
with a plier when pulling out
it.
In case it is difficult to cut off by
a gas welder and remove it,
1. Remove any point of the
piping connections (brazing
portions), which is easy to
remove or mount.
2. Make it easy to remove it by
cutting the piping etc. of the
body with a small copper
pipe cutter.
Note: Never use a metal saw for
sure since cut chips may
be mixed into the piping.
Brazing part Pressure switch
Main body of
electronic
expansion valve
Main body of
subcooling
electronic
expansion valve
Warning
If refrigerant gas leaks during
operation, ventilate the room.
(The exposure of refrigerant gas
to a fire causes generates toxic
gas.)
Caution
Do not suffer burns due to
contact with piping etc. heated by
a gas welder.
Caution
Protect the periphery of the
above by welding operation
sheets or steel plates, etc. so that
flame from a gas welder does not
affect surrounding of the
electronic expansion valve.

Procedure to Remove Electronic Expansion Valve and Peripheral Equipment Si341211
18 Removal Procedure
Step Procedure Points
7 Disconnect the brazing
part of main body at
solenoid valve.
Precautions on mounting
Mount it by means of the
non-oxidation brazing
method.
If nitrogen gas is not
available, quickly operate to
mount it.
It is necessary to prevent the
packing from deterioration
due to the carbonization of oil
or the heat affection within
the four way valve. For this
purpose, avoid the heating of
the valve by wrapping its
body with wet cloth and then
supplying water to the cloth to
keep wet.
(Keeping a temperature of
120ºC or lower)
Be careful not to crash the
piping by over-pressing it
with a plier when pulling out
it.
In case it is difficult to cut off by
a gas welder and remove it,
1. Remove any point of the
piping connections (brazing
portions), which is easy to
remove or mount.
2. Make it easy to remove it by
cutting the piping etc. of the
body with a small copper
pipe cutter.
Note: Never use a metal saw for
sure since cut chips may
be mixed into the piping.
Main body of unloading solenoid valve (Y3S)
Main body of solenoid
valve for hot gas (Y2S)
Warning
If refrigerant gas leaks during
operation, ventilate the room.
(The exposure of refrigerant gas
to a fire causes generates toxic
gas.)
Caution
Do not suffer burns due to
contact with piping etc. heated by
a gas welder.