The compressor frequency (Hz) measured with a clamp meter is 2 times of revolutions (rps) of the compressor.
– 8 –
4-1. Indoor Unit
10
10
9
9
8
8
7
7
6
1
LOUVER
MOTOR
6
5
5
4
4
3
3
2
2
1
1
AND INDICATION PARTS
CN25
INFRARED RAYS RECEIVE
WHI
BLU
BLU
BLU
BLU
BLU
BLU
BLU
BLU
BLU
BRW
RED
ORN
YEL
PNK
BLU
10
9
8
7
6
5
4
3
2
1
CN13
1
2
3
4
5
CN07
10
9
8
7
6
5
4
3
2
1
1
2
3
4
5
66
SWITCH PCB
MCC-1428B
CN101
WHI
CN100
4
5
IC04
R507
R09
R22
SG01
213
GRY
GRY
213
21
3
DB01
R01
FUSE
250VAC
F01
T6.3A
4. WIRING DIAGRAM
HEAT
EXCHANGER
SENSOR
(TCJ)
FOR FLOAT SWITCH
(OPTION)
When you use float
switch you should cut J401
C02
C15
CN402
POWER
SUPPLY
CIRCUIT
C01
R21
3
21
J401
DC12V
DC5V
CR502
RY501
MCC-1428A
R405
RY401
CN05
IC03
CR501
C501
CR401
21
21
CN03
21
2
121
2
121
CN01
R506
1
1
2
2
3
3
4
4
5
5
CN10
3
3
2
2
1
1
CN11
3
FOR DRAIN PUMP
2
1
CN401
BLK
BLK
BLK
BLK
WHI
RED
BLK
BRW
GRY
YEL
(OPTION)
1
1
2
2
3
3
4
4
5
5
66
3
3
2
2
1
1
THERMO
SENSOR
(TA)
HEAT
EXCHANGER
SENSOR
(TC)
WHI
RED
BLK
BLU
PUR
GRY
FAN-MOTOR
100”C
Check items
OPERATION
1
indicator
Terminal
2
block
Fuse
3
6.3A
DC 5V
4
DC 12V
5
BLK
P04
CN30
2
BLK
CN31
WHI
213
RED
INDOOR
TERMINAL
BLOCK
CN23
GRN&YEL
SIMPLE CHECK POINTS FOR DIAGNOSING FAULTS
Diagnosis result
Check to see if OPERATION indicator goes on and off when the main switch
or breaker is turned on.
Check the power supply voltage between 1 - 2 (Refer to the name plate.)
Chack the fluctuate voltage between 2 - 3 (DC15 to 60V)
Check to see if the fuse blows out. (Check the varistor. : R22, R21)
Check the voltage at the No.8 pin on CN13 connector of the infrared receiver.
(Check the transformer and the power supply circuit of the rated voltage.)
Check the voltage at the brown lead of the louver motor.
(Check the transformer and the power supply circuit of the rated voltage.)
– 9 –
INDOOR
UNIT
OUTDOOR
UNIT
Identification
BRW
RED
GRY
PNK
ORN
GRN&YEL
GRN
PUR
Color
WHI
YEL
BLU
BLK
BROWN
:
RED
:
WHITE
:
YELLOW
:
BLUE
:
BLACK
:
GRAY
:
PINK
:
ORANGE
:
GREEN&
:
YELLOW
GREEN
:
PURPLE
:
4-2. Outdoor Unit (RAV-SM560AT-E)
Q200
BLU
P17 P18
P21
P22
P23
RED
WHI
BLK
4
2 1
2331
CM
COMPRESSOR
CN301
IGBT MODULE
BZBYBXEWBWEVBVEUBU
P.C. BOARD
(MCC-813)
5
5
GRY
4 3
PNK
2 1
YEL
3
3
BLK
2 1
2 1
WHI
RED
2 1
4 3
FM
FAN MOTOR
Q300
CN300
BRW
P19P20
P14
PUR
REACTOR
DB01
CONVERTER
MODULE
~
~
–
+
ELECTRONIC
STARTER
–
–
–
F04
FUSE
T3. 15A
250V~
P13
P12
2 1
2 1
+
+
+
P11
2
GEA
P10
POWER
RELAY
C12
3
C13
C14
P02
1
TO
INDOOR
UNIT
REACTOR
ORN
P09
P08P07
CT
FUSE
T25A
250V~
P03
ORN
WHI
2
3
L
POWER
SUPPLY
220 to 240
50Hz
2 1
2 1
RELAY
VARISTOR
F01
P01
BLK
N
2 1
2 1
CN600
CN601
CN602
CN603
CN701
P06
SURGE
ABSORBER
2
1
THERMOSTAT
FOR
COMPRESSOR
CN500
TE
11
22
TD
11
22
33
TO
11
22
TS
11
22
33
11
22
33
COIL FOR
11
22
33
44
55
66
BLK
YEL
RED
ORN
RED
GRY
4-WAY VALVE
PMV
PULSE
MODULATING
VALVE
BLACK (C)
BLK
CN703
TERMINAL OF COMPRESSOR
WHITE (S)
The sign in ( ) is displayed
in the terminalcover
RED (R)
Check
items
1
2
3
4
SIMPLE CHECK POINTS FOR DIAGNOSING FAULTS
Diagnosis result
TERMINAL BLOCK
There is no supply voltage
(AC220 to 240V) between L - N , 1 - 2
There is no voltage (DC15 to 25V) 2 - 3
FUSE
T25A 250V to fuse (F01) blown
T3.15A 250V to fuse (F04) blown
ELECTROLYTIC CAPACITOR VOLTAGE (C12, C13, C14)
DC320V not available between
+ – terminal of electrolytic capacitor
INVERTER OUTPUT (Inverter and compressor connector out of position)
(Please confirm within six minutes after instructing in the drive.)
Voltage between each line of in v erter side
conector pins are not equal.
Power supply and connecting
cable check
Converter module (DB01) and
electrolytic capacitor (C12 to C14) check
IGBT module (Q200) check
Fan motor check
ELECTROLYTIC CAPACITOR VOLTAGE (C10, C11, C12, C13)
DC320V not available between
+ terminal of electrolytic capacitor
INVERTER OUTPUT (CN09, CN10, CN11)
(Please confirm within six minutes after instructing in the drive.)
Voltage between each line of inverterside
conector pins are not equal.
Connecting cable check
Converter module (DB01) and electrolytic
capacitor (C10 to C13) check IGBT
module (Q200) check, Fan motor check
SUB P.C. board check
1Fan motor (for indoor)AFP-220-50-4AOutput (Rated) 50 W, 220 – 240 V
2Grille motorMP35EA12DC 12 V
3Thermo. sensor (TA-sensor)550 mm10 kΩ at 25°C
4Heat exchanger sensor (TC-sensor)∅6 mm, 500 mm10 kΩ at 25°C
5Heat exchanger sensor (TCJ-sensor)∅6 mm, 500 mm10 kΩ at 25°C
5-2. Outdoor Unit (RAV-SM560AT-E)
No.Parts nameTypeSpecifications
1Fan motorICF-140-43-1Output (Rated) 40 W
2CompressorDA130A1F-23F3 phase, 4P, 1100 W
3ReactorCH-571=10 mH, 16A
4Outdoor temp. sensor (To-sensor)—10 kΩ at 25°C
5Heat exchanger sensor (Te-sensor)—10 kΩ at 25°C
6Suction temp. sensor (Ts-sensor)—10 kΩ at 25°C
7Discharge temp. sensor (Td-sensor)—50 kΩ at 25°C
8Fuse (Switching power (Protect))—T3.15 A, AC 250 V
9Fuse (Inverter, input (Current protect)—25 A, AC 250 V
104-way valve solenoid coilSTF-0108G
11Compressor thermo. (Protection)US-622ON : 90 ± 5°C, OFF : 125 ± 4°C
5-3. Outdoor Unit (RAV-SM800AT-E)
No.Parts nameTypeSpecifications
1Fan motorICF-140-63-1Output (Rated) 63 W, 220 – 240 V
2CompressorDA220A2F-20L3 phase, 4P, 1600 W
3ReactorCH-47
4Outdoor temp. sensor (To-sensor)—10 kΩ at 25°C
5Heat exchanger sensor (Te-sensor)—10 kΩ at 25°C
6Suction temp. sensor (Ts-sensor)—10 kΩ at 25°C
7Discharge temp. sensor (Td-sensor)—50 kΩ at 25°C
8Fuse (Switching power (Protect))—T3.15 A, AC 250 V
9Fuse (Inverter, input (Current protect)—25 A, AC 250 V
104-way valve solenoid coilDKV-M0ZS743B0
11Compressor thermo. (Protection)US-622ON : 90 ± 5°C, OFF : 125 ± 4°C
– 12 –
6. REFRIGERANT R410A
This air conditioner adopts the new refrigerant HFC
(R410A) which does not damage the ozone layer.
The working pressure of the new refrigerant R410A is
1.6 times higher than conventional refrigerant (R22).
The refrigerating oil is also changed in accordance
with change of refrigerant, so be careful that water,
dust, and existing refrigerant or refrigerating oil are not
entered in the refrigerant cycle of the air conditioner
using the new refrigerant during installation work or
servicing time.
The next section describes the precautions for air
conditioner using the new refrigerant. Conforming to
contents of the next section together with the general
cautions included in this manual, perform the correct
and safe work.
6-1. Safety During Installation/Servicing
As R410A’s pressure is about 1.6 times higher than
that of R22, improper installation/servicing may cause
a serious trouble. By using tools and materials exclusive for R410A, it is necessary to carry out installation/
servicing safely while taking the following precautions
into consideration.
(1) Never use refrigerant other than R410A in an air
conditioner which is designed to operate with
R410A.
If other refrigerant than R410A is mixed, pressure
in the refrigeration cycle becomes abnormally
high, and it may cause personal injury, etc. by a
rupture.
(2) Confirm the used refrigerant name, and use tools
and materials exclusive for the refrigerant R410A.
The refrigerant name R410A is indicated on the
visible place of the outdoor unit of the air conditioner using R410A as refrigerant. To prevent
mischarging, the diameter of the service port
differs from that of R22
(3) If a refrigeration gas leakage occurs during
installation/servicing, be sure to ventilate fully.
If the refrigerant gas comes into contact with fire,
a poisonous gas may occur.
(4) When installing or removing an air conditioner,
do not allow air or moisture to remain in the
refrigeration cycle. Otherwise, pressure in the
refrigeration cycle may become abnormally high
so that a rupture of personal injury may be
caused.
(5) After completion of installation work, check to
make sure that there is no refrigeration gas
leakage.
If the refrigerant gas leaks into the room, coming
into contact with fire in the fan-driven heater,
space heater, etc., a poisonous gas may occur.
(6) When an air conditioning system charged with a
large volume of refrigerant is installed in a small
room, it is necessary to exercise care so that,
even when refrigerant leaks, its concentration
does not exceed the marginal level.
If the refrigerant gas leakage occurs and its
concentration exceeds the marginal level, an
oxygen starvation accident may result.
(7) Be sure to carry out installation or removal
according to the installation manual.
Improper installation may cause refrigeration
trouble, water leakage, electric shock, fire, etc.
(8) Unauthorized modifications to the air conditioner
may be dangerous. If a breakdown occurs please
call a qualified air conditioner technician or
electrician.
Improper repair’s may result in water leakage,
electric shock and fire, etc.
6-2. Refrigerant Piping Installation
6-2-1. Piping materials and joints used
For the refrigerant piping installation, copper pipes and
joints are mainly used. Copper pipes and joints suitable for the refrigerant must be chosen and installed.
Furthermore, it is necessary to use clean copper pipes
and joints whose interior surfaces are less affected by
contaminants.
(1) Copper pipes
It is necessary to use seamless copper pipes
which are made of either copper or copper alloy
and it is desirable that the amount of residual oil is
less than 40 mg/10 m. Do not use copper pipes
having a collapsed, deformed or discolored
portion (especially on the interior surface).
Otherwise, the expansion valve or capillary tube
may become blocked with contaminants.
As an air conditioner using R410A incurs pressure
higher than when using R22, it is necessary to
choose adequate materials.
Thicknesses of copper pipes used with R410A are
as shown in Table 6-2-1. Never use copper pipes
thinner than 0.8 mm even when it is available on
the market.
For copper pipes, flare joints or socket joints are
used. Prior to use, be sure to remove all
contaminants.
a) Flare joints
Flare joints used to connect the copper pipes
cannot be used for pipings whose outer
diameter exceeds 20 mm. In such a case,
socket joints can be used.
Sizes of flare pipe ends, flare joint ends and
flare nuts are as shown in Tables 6-2-3 to 6-2-6
below.
Socket joints are such that they are brazed for
connections, and used mainly for thick pipings
whose diameter is larger than 20 mm.
Thicknesses of socket joints are as shown in
Table 6-2-2.
copper pipe jointed (mm)(mm)
6-2-1. Processing of piping materials
When performing the refrigerant piping installation,
care should be taken to ensure that water or dust does
not enter the pipe interior, that no other oil other than
lubricating oils used in the installed air conditioner is
used, and that refrigerant does not leak. When using
lubricating oils in the piping processing, use such
lubricating oils whose water content has been removed.
When stored, be sure to seal the container with an
airtight cap or any other cover.
(1) Flare Processing procedures and precautions
a) Cutting the pipe
By means of a pipe cutter, slowly cut the pipe
so that it is not deformed.
b) Removing burrs and chips
If the flared section has chips or burrs,
refrigerant leakage may occur. Carefully
remove all burrs and clean the cut surface
before installation.
c) Insertion of flare nut
– 14 –
d) Flare processing
Make certain that a clamp bar and copper pipe
have been cleaned.
By means of the clamp bar, perform the flare
processing correctly.
Use either a flare tool for R410A or conventional flare tool.
Flare processing dimensions differ according to
the type of flare tool. When using a conventional flare tool, be sure to secure “dimension A”
by using a gauge for size adjustment.
∅D
A
Fig. 6-2-1 Flare processing dimensions
Table 6-2-3 Dimensions related to flare processing for R410A
A (mm)
Conventional flare tool
Clutch typeWing nut type
Nominal
diameter
Outer
diameter
(mm)
Thickness
(mm)
Flare tool for R410A
clutch type
1/46.350.80 to 0.51.0 to 1.51.5 to 2.0
3/89.520.80 to 0.51.0 to 1.51.5 to 2.0
1/212.700.80 to 0.51.0 to 1.52.0 to 2.5
5/815.881.00 to 0.51.0 to 1.52.0 to 2.5
Table 6-2-4 Dimensions related to flare processing for R22
A (mm)
Conventional flare tool
Clutch typeWing nut type
Nominal
diameter
Outer
diameter
(mm)
Thickness
(mm)
Flare tool for R22
clutch type
1/46.350.80 to 0.50.5 to 1.01.0 to 1.5
3/89.520.80 to 0.50.5 to 1.01.0 to 1.5
1/212.700.80 to 0.50.5 to 1.01.5 to 2.0
5/815.881.00 to 0.50.5 to 1.01.5 to 2.0
Table 6-2-5 Flare and flare nut dimensions for R410A
Fig. 6-2-2 Relations between flare nut and flare seal surface
(2) Flare connecting procedures and precautions
a) Make sure that the flare and union portions do
not have any scar or dust, etc.
b) Correctly align the processed flare surface with
the union axis.
c) Tighten the flare with designated torque by
means of a torque wrench. The tightening
torque for R410A is the same as that for
conventional R22. Incidentally, when the torque
is weak, the gas leakage may occur.
Table 6-2-7 Tightening torque of flare for R410A [Reference values]
NominalOuter diameterTightening torque
diameter (mm)N·m (kgf·cm)
1/46.3514 to 18 (140 to 180)16 (160), 18 (180)
3/89.5233 to 42 (330 to 420)42 (420)
1/212.7050 to 62 (500 to 620)55 (550)
5/815.8863 to 77 (630 to 770)65 (650)
When it is strong, the flare nut may crack and
may be made non-removable. When choosing
the tightening torque, comply with values
designated by manuf acturers. Table 6-2-7
shows reference values.
Note:
When applying oil to the flare surface, be sure to use
oil designated by the manufacturer. If any other oil is
used, the lubricating oils may deteriorate and cause
the compressor to burn out.
Tightening torque of torque
wrenches available on the market
N·m (kgf·m)
– 16 –
6-3. T ools
6-3-1. Required tools
The service port diameter of packed valve of the outdoor unit in the air conditioner using R410A is changed to
prevent mixing of other refrigerant. To reinforce the pressure-resisting strength, flare processing dimensions and
opposite side dimension of flare nut (For ∅12.70 copper pipe) of the refrigerant piping are lengthened.
The used refrigerating oil is changed, and mixing of oil may cause a trouble such as generation of sludge,
clogging of capillary, etc. Accordingly, the tools to be used are classified into the following three types.
(1) Tools exclusive for R410A (Those which cannot be used for conventional refrigerant (R22))
(2) Tools exclusive for R410A, but can be also used for conventional refrigerant (R22)
(3) Tools commonly used for R410A and for conventional refrigerant (R22)
The table below shows the tools exclusive for R410A and their interchangeability.
Tools exclusive for R410A (The following tools for R410A are required.)
Tools whose specifications are changed for R410A and their interchangeability
R410A air conditionerConventional air
installationconditioner installation
No.Used toolUsageExistence ofWhetherWhether new equipment
new equipmentconventionalcan be used with
for R410Aequipment canconventional refrigerant
be used
1Flare toolPipe flaringYes*(Note 1)
2Copper pipe gaugeFlaring by
for adjusting projection conventional flareYes*(Note 1)*(Note 1)
margintool
Evacuating,
refrigerant charge,Yes
run check, etc.
Refrigerant chargeYes
Yes
(Note 1) When flaring is carried out for R410A using the conventional flare tools, adjustment of projection
margin is necessary. For this adjustment, a copper pipe gauge, etc. are necessary.
(Note 2) Charging cylinder for R410A is being currently developed.
General tools (Conventional tools can be used.)
In addition to the above exclusive tools, the following equipments which serve also for R22 are necessary as
the general tools.
(1) Vacuum pump(4) Reamer(9) Hole core drill (∅65)
Use vacuum pump by(5) Pipe bender(10) Hexagon wrench
attaching vacuum pump adapter. (6) Level vial(Opposite side 4 mm)
(2) Torque wrench(7) Screwdriver (+, –)(11) Tape measure
(3) Pipe cutter(8) Spanner of Monkey wrench(12) Metal saw
Also prepare the following equipments for other installation method and run check.
(1) Clamp meter(3) Insulation resistance tester
(2) Thermometer(4) Electroscope
– 17 –
6-4. Recharging of Refrigerant
When it is necessary to recharge refrigerant, charge the specified amount of new refrigerant according to the
following steps.
Recover the refrigerant, and check no refrigerant
remains in the equipment.
When the compound gauge’s pointer has indicated -0.1 Mpa (-76 cmHg), place the handle Low
Connect the charge hose to packed valve service
port at the outdoor unit’s gas side.
in the fully closed position, and turn off the
vacuum pump’s power switch.
Connect the charge hose of the vacuum pump
adapter.
Open fully both packed valves at liquid and gas
sides.
Keep the status as it is for 1 to 2 minutes, and
ensure that the compound gauge’s pointer does
not return.
Set the refrigerant cylinder to the electronic
balance, connect the connecting hose to the
cylinder and the connecting port of the electronic
balance, and charge liquid refrigerant.
Place the handle of the gauge manifold Low in
(For refrigerant charging, see the figure below.)
the fully opened position, and turn on the vacuum
pump’s power switch. Then, evacuating the
refrigerant in the cycle.
1 Never charge refrigerant exceeding the specified amount.
2 If the specified amount of refrigerant cannot be charged, charge refrigerant bit by bit in COOL mode.
3 Do not carry out additional charging.
When additional charging is carried out if refrigerant leaks, the refrigerant composition changes in the
refrigeration cycle, that is characteristics of the air conditioner changes, refrigerant exceeding the
specified amount is charged, and working pressure in the refrigeration cycle becomes abnormally high
pressure, and may cause a rupture or personal injury.
(INDOOR unit)
Refrigerant cylinder
(With siphon pipe)
Check valve
Open/Close valve
for charging
Electronic balance for refrigerant charging
Fig. 6-4-1 Configuration of refrigerant charging
(Liquid side)
(Gas side)
– 18 –
(OUTDOOR unit)
Opened
Closed
Service port
1 Be sure to make setting so that liquid can be charged.
2 When using a cylinder equipped with a siphon, liquid can be charged without turning it upside down.
It is necessary for charging refrigerant under condition of liquid because R410A is mixed type of refrigerant.
Accordingly, when charging refrigerant from the refrigerant cylinder to the equipment, charge it turning the
cylinder upside down if cylinder is not equipped with siphon.
[Cylinder with siphon][Cylinder with siphon][Cylinder without siphon]
Gauge manifold
OUTDOOR unit
Refrigerant
cylinder
Gauge manifold
OUTDOOR unit
cylinder
Refrigerant
Electronic
balance
R410A refrigerant is HFC mixed refrigerant.
Therefore, if it is charged with gas, the composition
of the charged refrigerant changes and the
characteristics of the equipment varies.
6-5. Brazing of Pipes
6-5-1. Materials for brazing
(1) Silver brazing filler
Silver brazing filler is an alloy mainly composed of
silver and copper. It is used to join iron, copper or
copper alloy, and is relatively expensive though it
excels in solderability.
(2) Phosphor bronze brazing filler
Phosphor bronze brazing filler is generally used to
join copper or copper alloy.
(3) Low temperature brazing filler
Low temperature brazing filler is generally called
solder, and is an alloy of tin and lead. Since it is
weak in adhesive strength, do not use it for
refrigerant pipes.
Electronic
balance
Siphon
Fig. 6-4-2
1 Phosphor bronze brazing filler tends to react
with sulfur and produce a fragile compound
water solution, which may cause a gas leakage .
Therefore, use any other type of brazing filler at
a hot spring resort, etc., and coat the surface
with a paint.
2 When performing brazing again at time of
servicing, use the same type of brazing filler.
6-5-2. Flux
(1) Reason why flux is necessary
• By removing the oxide film and any foreign
matter on the metal surface, it assists the flow of
brazing filler.
• In the brazing process, it prevents the metal
surface from being oxidized.
• By reducing the brazing filler’s surface tension,
the brazing filler adheres better to the treated
metal.
– 19 –
(2) Characteristics required for flux
• Activated temperature of flux coincides with the
brazing temperature.
• Due to a wide effective temperature range , flux
is hard to carbonize.
• It is easy to remove slag after brazing.
• The corrosive action to the treated metal and
brazing filler is minimum.
• It excels in coating performance and is harmless
to the human body.
As the flux works in a complicated manner as
described above, it is necessary to select an
adequate type of flux according to the type and
shape of treated metal, type of brazing filler and
brazing method, etc.
(3) Types of flux
• Noncorrosive flux
Generally, it is a compound of borax and boric
acid.
It is effective in case where the brazing
temperature is higher than 800°C.
• Activated flux
Most of fluxes generally used for silver brazing
are this type.
It features an increased oxide film removing
capability due to the addition of compounds
such as potassium fluoride, potassium chloride
and sodium fluoride to the borax-boric acid
compound.
(4) Piping materials for brazing and used brazing
filler/flux
6-5-3. Brazing
As brazing work requires sophisticated techniques,
experiences based upon a theoretical knowledge, it
must be performed by a person qualified.
In order to prevent the oxide film from occurring in the
pipe interior during brazing, it is effective to proceed
with brazing while letting dry Nitrogen gas (N
) flow.
2
Never use gas other than Nitrogen gas.
(1) Brazing method to prevent oxidation
1 Attach a reducing valve and a flow-meter to the
Nitrogen gas cylinder.
2 Use a copper pipe to direct the piping material,
and attach a flow-meter to the cylinder.
3 Apply a seal into the clearance between the
piping material and inserted copper pipe for
Nitrogen in order to prevent backflow of the
Nitrogen gas.
4 When the Nitrogen gas is flowing, be sure to
keep the piping end open.
5 Adjust the flow rate of Nitrogen gas so that it is
3
lower than 0.05 m
2
) by means of the reducing valve.
cm
/Hr or 0.02 Mpa (0.2 kgf/
6 After performing the steps above, keep the
Nitrogen gas flowing until the pipe cools down
to a certain extent (temperature at which pipes
are touchable with hands).
7 Remove the flux completely after brazing.
M
Flow meter
PipingUsed brazingUsed
material filler flux
Copper - Copper Phosphor copperDo not use
Copper - IronSilverPaste flux
Iron - IronSilverVapor flux
1 Do not enter flux into the refrigeration cycle.
2 When chlorine contained in the flux remains
within the pipe, the lubricating oil deteriorates.
Therefore, use a flux which does not contain
chloring.
3 When adding water to the flux, use water which
does not contain chlorine (e.g. distilled water or
ion-exchange water).
4 Remove the flux after brazing.
Stop valve
Nitrogen gas
cylinder
From Nitrogen cylinder
Pipe
Nitrogen
gas
Rubber plug
Fig. 6-5-1 Prevention of oxidation during brazing
– 20 –
Heat Exchanger Sensor (TCJ)
Heat Exchanger Sensor (TC)
Temperature Sensor
7. CONTROL BLOCK DIAGRAM
Indoor Unit Control Panel
8 MHzM.C.U.
Functions
• Louver Control
• 3-minute Delay at Restart for Compressor
Hi POWER
Display
FILTER Sign
Display
Infrared Rays Signal Receiver
Initiallizing Circuit
Infrared
Rays
36.7 kHz
Clock Frequence
Oscillator Circuit
Power Supply
Remote
Circuit
Control
Noise Filter
From Outdoor Unit
• Motor Revolution Control
• Processing
(Temperature Processing)
• Timer
• Drain Pump ON/OFF
• Serial Signal Communication
Serial Signal
Transmitter/
Receiver
Serial Signal Communication
Relay
RY401
Louver ON/OFF Signal
Louver Driver
PRE DEF.
Sign Display
TIMER
Display
OPERATION
Display
Indoor Fan
Motor
Louver Motor
Float
Switch
Drain
Pump
REMOTE CONTROL
Infrared Rays
Remote Control
Operation (START/STOP)
Operation Mode Selection
AUTO, COOL, DRY, HEAT, FAN ONLY
Temperature Setting
Fan Speed Selection
ON TIMER Setting
OFF TIMER Setting
Louver Auto Swing
Louver Direction Setting
ECO
Hi power
Filter Reset
– 21 –
8. OPERATION DESCRIPTION
8-1.When power supply is reset
(1) Distinction of outdoor units
When the power supply is reset, the outdoors are
distinguished, and control is exchanged according
to the distinguished result.
(2) Setting of the indoor fan speed
Based on EEPROM data, rspeed of the indoor fan
is selected.
Remarks: Air speed
8-2.Operation mode selection
(1) Based on the operation mode selecting command
from the remote control, the operation mode is
selected.
Table 8-2-1
Remote control
command
STOPAir conditioner stops.
FANFan operation
COOLCooling operation
DRYDry operation
HEATHeating operation
AUTOAutomatic operation
(2) Automatic Operation
• The air conditioner selects and operates in one
of the operating modes of cooling, heating or
fan only, depending on the room temperature.
• If the AUTO mode is uncomfortable, you can
select the desired conditions manually.
Outline of control
8-3.Air volume control
(1) Operation with [HIGH (H)], [MED (M)], [LOW (L)],
or [AUTO] mode is performed by the command
from the remote control.
(2) When [FAN] button is set to AUTO, the indoor fan
motor operates as shown in Fig. 8-3-1, Fig. 8-3-2
and Table 8-3-1.
<COOL>
°C
+3
+2.5
+2
+1.5
+1
+0.5
(Room temp.) − (Preset temp.)
Preset
temp.
0
−0.5
NOTE :
*1: The values marked with *1 are calculated and
controlled by the difference in motor speed
between M+ and L–.
Fig. 8-3-1
M+
*1
*1
*1
Table 8-2-2
Room temperature in operationOperating condition
The set temperature +1°C or higher
(in case that the room is hot)
The set temperature –1°C to +1°C
Cooling
operation
Fan only
operation
Performs the cooling operation at a temperature 1°C
higher than the setting.
Performs the fan only operation (low speed) while
monitoring the room temperature. When the room
temperature changes, the air conditioner will select the
cooling or heating mode.
The set temperature –1°C or lower
(in case that the room is cold)
Heating
operation
Performs the heating operation at a temperature 1°C
lower than the setting.
– 22 –
<HEAT>
8-4.Cool air discharge preventive control
Preset
temp.
°C
0
−0.5
−1
−1.5
−2
−5.0
−5.5
[FAN AUTO]
(Room temp.) − (Preset temp.)
L
*1
*2
+
M
H
NOTE :
*1, *2 : The values marked with *1 and *2 are
calculated and controlled by the difference in
motor speed between M+ and L.
Fig. 8-3-2
Table 8-3-1
RAV-SM560XT-ERAV-SM800XT-E
MODEL
CoolingHIGH10608001190900
andMED9506901010750
Fan onlyLOW800580850650
HeatingMED9707301070800
Motor speed Air flow level Motor speed Air flow level
(rpm)(m3/h)(rpm)(m3/h)
HIGH11208301300980
LOW820600860650
In heating operation, the indoor heat exchanger
restricts revolving speed of the fan motor to prevent a
cold draft. The upper limit of the revolving speed is
shown in Fig. 8-4-1 and Table 8-4-1.
Manual
(One of
AUTO
*4
SUL*
SUL*1
Stop
5 steps)
L−H
(Up to
setting
3
speed)
*2
A+4 A+4
A−8A−8
464534
33
3321
3220
*6*5
NOTES :
*1: The fan stops for 2 minutes after thermostat-OFF.
*2: A is 24°C when the preset temperature is 24°C or
more and A is the preset temperature when it is
under 24°C.
*3: SUL means Super Ultra Low.
*4: Calculated from difference in motor speed
between SUL and HIGH.
Fig. 8-4-1 Cold draft preventing control
LOW
MED
LOW+MED
+
=
MED+HIGH
+
=
*5 and *6:
2
2
Fan*5*6
speedStarting periodStabilized period
AUTO• Up until 12 minutes
passed after starting
the unit
• From 12 to 25 minutes
passed after starting
the unit and room
temperature is 3°C
lower than preset
temperature
Manual• Room temperature
(L – H)< Preset temperature
Table 8-4-1
–4°C
• From 12 to 25 minutes
passed after starting
the unit and room
temperature is
between preset
temperature and 3°C
lower than preset
temperature
• 25 minutes or more
passed after starting
the unit
• Room temperature
Preset temperature
–3.5°C
– 23 –
8-5.Freeze preventive control (Low
temperature release)
The cooling operation (including Dry operation) is
performed as follows based on the detected
temperature of Tc sensor or Tcj sensor.
When [J] zone is detected for T1 minutes (Following
figure), the commanded frequency is decreased from
the real operation frequency. After then the
commanded frequency changes every 2 minutes while
operation is performed in [J] zone.
T1
Normal1 minute
In [K] zone, time counting is interrupted and the
operation is held.
When [I] zone is detected, the timer is cleared and the
operation returns to the normal operation.
(°C)
7
6
5
In heating operation, the freeze-preventive control
works if 4-way valve is not exchanged and the
condition is satisfied.
I
J
Fig. 8-5-1
A
K
8-7.Louver control
(1) Vertical air flow louver
Position of veritcal air flow louver is automatically
controlled according to the operation mode.
Besides, position of vertical air flow louver can be
arbitrarily set by pressing [FIX] button.
The louver position which is set by [FIX] button is
stored in the microcomputer, and the louver is
automatically set at the stored position for the next
operation.
(2) Swing
If [SWING] button is pressed when the indoor unit
is in operation, the vertical air flow louver starts
swinging. When [SWING] button is pressed, it
stops swinging.
8-8.Filter sign display
(1) The operation time of the indoor fan is calculated,
the filter lamp (Orange) on the display part of the
main unit goes on when the specified time (240H)
has passed. When a wired remote controller is
connected, the filter reset signal is sent to the
remote controller, and also it is displayed on LCD
of the wired remote control.
(2) When the filter reset signal has been received
from the wired remote control after [FILTER] lamp
has gone on or when the filter check button
(Temporary button) is pushed, time of the
calculation timer is cleared. In this case, the
measurement time is reset if the specified time
has passed, and display on LCD and the display
on the main unit disappear.
Remarks:
Tcj : Indoor heat exchanger sensor temperature
8-6.High-temp release control
The heating operation is performed as follows based
on the detected temperature of Tc sensor.
•When [M] zone is detected, the commanded
frequency is decreased from the real operation
frequency. After then the commanded frequency
changes every 30 seconds while operation is
performed in [M] zone.
•In [N] zone, the commanded frequency is held.
•When [L] zone is detected, the commanded
frequency is returned to the original value by
approx. 6Hz every 60 seconds.
Tc (°C)
55 A
52
48 B
L
M
N
Remarks:
[FILTER] goes on
Fig. 8-6-1
– 24 –
8-9.Auto Restart Function
PRE.DFILTERHi POWER
PRE.DFILTERHi POWER
The indoor unit is equipped with an automatic
restarting function which allows the unit to restart
operating with the set operating conditions in the event
of power supply being accidentally shut down. The
operation will resume without warning three minutes
after power is restored.
This function is not set to work when shipped from the
factory. Therefore it is necessary to set it to work.
8-9-1. How to set auto restart function
To set the auto restart function, proceed as follows:
The power supply to the unit must be on; the function
will not set if the power is off.
Push the [TEMPORARY] button located in the center
of the front panel continuously for three seconds.
The unit receives the signal and beeps three times.
The unit then restarts operating automatically in the
event of power supply being accidentally shut down.
When the unit is on standby (Not operating)
OperationMotions
Push [TEMPORARY] button for moreThe unit is on standby.
than three seconds.
→
The unit starts to operate.The green lamp is on.
→
After approx. three seconds,
0
3S
The unit beeps three timesThe lamp changes from
and continues to operate.green to orange.
TEMPORARY
button
If the unit is not required to operate at this time, push [TEMPORARY]
button once more or use the remote control to turn it off.
When the unit is in operation
OperationMotions
Push [TEMPORARY] button for moreThe unit is in operation.The green lamp is on.
than three seconds.
The unit stops operating.The green lamp is turned off.
→
→
After approx. three seconds,
0
3S
TEMPORARY
button
•While this function is being set, if the unit is in
operation, the orange lamp is on.
•This function can not be set if the timer operation
The unit beeps three times.
If the unit is required to operate at this time, push [TEMPORARY]
button once more or use the remote control to turn it on.
•While the filter check lamp is on, the
TEMPORARY button has the function of filter
reset button.
has been selected.
•When the unit is turned on by this function, the
louver will not swing even though it was swinging
automatically before shutting down.
– 25 –
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