Toshiba RAS-M16GDV-E, RAS-M10GDCV-E, RAS-M10GDV-E, RAS-M13GDCV-E, RAS-M16GDCV-E SERVICE MANUAL
...
Heat Pump Model Cooling Only Model
KIT commande filaire RBC-SHA1LE2
RAS-M10GDV-E RAS-M10GDCV-E
RAS-M13GDV-E RAS-M13GDCV-E
RAS-M16GDV-E RAS-M16GDCV-E
R410A
PRINTED IN JAPAN, Nov., 2005 ToMo
CONTENTS
1. PRECAUTIONS FOR SAFETY ................................................................. 3
2. SPECIFICATIONS..................................................................................... 5
3. CONSTRUCTION VIEWS ......................................................................... 8
4. WIRING DIAGRAM ................................................................................... 9
5. SPECIFICATIONS OF ELECTRICAL PARTS ........................................ 10
6. REFRIGERANT CYCLE DIAGRAM ....................................................... 11
7. CONTROL BLOCK DIAGRAM ............................................................... 12
8. OPERATION DESCRIPTION .................................................................. 13
9. INSTALLATION PROCEDURE ............................................................... 23
10. DRAIN-UP KIT (OPTION)....................................................................... 38
11. HO W TO DIA GNOSE THE TROUBLE ..................................................... 42
12. HOW TO REPLACE THE MAIN PARTS.................................................. 53
13. EXPLODED VIEWS AND PARTS LIST .................................................. 55
– 2 –
1. PRECAUTIONS FOR SAFETY
For general public use
Power supply cord of Outdoor unit shall be more than 2.5mm² (H07RN-F or 245 IEC66) polychloroprene
sheathed flexible cord.
• Read this “Precautions for Saf ety” carefully before servicing.
• The precautions described below include the important items regarding saf ety. Observe them without fail.
• After the servicing work, perf orm a trial operation to check for any problem.
• Turn off the main power supply switch (or breaker) before the unit maintenance.
CAUTION New Refrigerant Air Conditioner Servicing
• THIS AIR CONDITIONER ADOPTS THE NEW HFC REFRIGERANT (R410A) WHICH DOES NOT
DESTROY OZONE LAYER.
The characteristics of R410A refrigerant is easy to absorb water, oxidizing membrane or oil, and its pressure
is approx. 1.6 times of refrigerant R22. Accompanied with adoption of the new refrigerant, refrigerating oil
has been also changed. Therefore, during servicing work, be sure that water, dust, former refrigerant, or
refrigerating oil does not enter into the refrigerating cycle of new refrigerant air conditioner.
To prev ent from mixing of refrigerant and refrigerating oil, the sizes of connecting sections of charging port of
the main unit or installation tools are different from those f or the con ventional refrigerant.
Accordingly, the exclusive tools are required for the new refrigerant (R410A).
For connecting pipes, use ne w and clean piping materials with high pressure-tight force, which were made for
R410A only, so that water or dust does not enter. Moreover, do not use the existing piping because there are
problems about pressure-tight force and impurity it.
CAUTION To Disconnect the Appliance from the Main Power Supply.
This appliance must be connected to the main power supply b y means of a circuit breaker or a switch with a
contact separation of at least 3 mm.
If this is not possible, a power supply plug with g rounding must be used. This plug must be easily accessible
after installation. The plug must be disconnected from the power supply socket in order to disconnect the
appliance completely from the mains.
The installation fuse (25A D type ) must be used for the power supply line of this air
conditioner.
W ARNINGS
• Ask an authorized dealer or qualified installation professional to install/maintain the air
conditioner.
Inappropriate servicing may result in water leakage, electric shock or fire.
• Turn off the main power supply switch or breaker before attempting any electrical work.
Make sure all power switches are off. Failure to do so may cause electric shock.
• Connect the connecting cable correctly.
If the connecting cable is connected by wrong way, electric parts may be damaged.
• When moving the air-conditioner for installing it in another place again, be very careful not to
get the specified refrigerant (R410A) with any other gaseous body into the refrigeration cycle.
If air or any other gas is mixed in the refrigerant, the gas pressure in the refrigeration cycle becomes
abnormally high and it resultingly causes burst of the pipe and injuries on persons.
– 3 –
• Never modify this unit by removing any of the safety guards or by by-passing any of the
safety interlock switches.
• Exposure of unit to water or other moisture before servicing may cause a short circuit.
Do not store it in a wet basement or expose to rain or w ater.
• After unpacking the unit, examine it carefully for possible damage.
• Do not install in a place that can increase the vibration of the unit.
• To avoid personal injury, be careful when handling parts with sharp edges.
• Perform installation work properly according to the Installation Manual.
Inappropriate installation may result in water leakage, electric shock or fire.
• When installing the air conditioner in a small room, provide appropriate measures to ensure
that the concentration of refrigerant in the room does not exceed the critical level should
leakage occur.
It is not dangerous refrigerant; it has not toxicity or combustibility. However, a concentration above 0.3kg/m³
as criterion still causes suffocation. The volume of refrigerant charged to the Multi System air conditioner is
more than the volume charged to a conventional individual system.
• Install the air conditioner securely in a location where the weight of the unit can be sustained
adequately.
• Perform the specified installation work to guard against an earthquake.
If the air conditioner is not installed appropriately, accidents may occur due to the falling unit.
• If refrigerant gas has leaked during the servicing work, ventilate the room immediately.
If the leaked refrigerant gas comes in contact with fire, no xious gas may generate.
• After the installation work, confirm that refrigerant gas does not leak.
If refrigerant gas leaks into the room and flows near a fire source, such as a cooking range, noxious gas
may generate.
• The electrical work must be performed by a qualified electrician in accordance with the Installation Manual. Make sure the air conditioner uses an exclusive circuit.
An insufficient circuit capacity or inappropriate installation may cause fire.
• When wiring, use the specified cables and connect the terminals securely to prevent external
forces applied to the cable from affecting the terminals.
• Be sure to provide grounding.
Do not connect ground wires to gas pipes, water pipes, lightning rods or ground wires for telephone cables.
• Conform to the regulations of the local electric company when wiring the power supply.
Inappropriate grounding may cause electric shock.
• Do not install the air conditioner in a location subject to a risk of exposure to combustible
gas.
Otherwise, the combustib le gas may leak and a fire may occur.
– 4 –
2. SPECIFICATIONS
1. Combination List of Indoor/Outdoor Units (¡: Possible ×: Impossible)
Heat Pump Model RAS- Cooling Only Model RAS-
M10GDV-E M13GDV-E M16GDV-E M10GDCV-E M13GDCV-E M16GDCV-E
¡¡¡ ×××
¡¡¡ ×××
¡¡ ××××
¡¡¡ ×××
××ס¡¡
××ס¡¡
××ס¡ ×
××ס¡¡
Outdoor unit
Heat Pump Model
RAS-
Cooling Only Model
RAS-
Indoor unit
4M27GAV-E
3M26GAV-E
M14GAV-E
M18GAV-E
4M27GACV-E
3M23GACV-E
M14GACV-E
M18GACV-E
2. File No. List of Reference Service Manual (Outdoor Units of Multi Air Conditioner)
Outdoor unit
Heat Pump Model
RAS-
Cooling Only Model
RAS-
4M27GAV-E
3M26GAV-E
M14GAV-E
M18GAV-E
4M27GACV-E
3M23GACV-E
M14GACV-E
M18GACV-E
Reference Service Manual
File No. A05-011
File No. A05-011
File No. A05-009
File No. A05-009
File No. A05-011
File No. A05-014
File No. A05-009
File No. A05-009
3. For the details of the specifications of each
indoor/outdoor unit to be combined, refer to the
next page and after pages with the above service
manuals.
4. Optional Parts List
Product name
Drain-up kit
– 5 –
Model name
RB-F81E2
RAS-M10GDV-E, RAS-M13GDV-E, RAS-M16GDV-E (Heat Pump Model)
Indoor unit model name
Cooling capacity (kW)
Cooling capacity range (kW)
Heating capacity (kW)
Heating capacity range (kW)
Power supply (Ø-V-Hz)
Electric characteristics
2
*
Blower unit
Sound level *4
Dimension Width (mm)
Net weight (kg)
Connecting type
Connecting pipe
Refrigerant
Wiring connection Interconnection
Usable temperature range (Cooling/Heating) (°C)
Accessory
Operation current (A)
Power consumption (W)
Power factor (%)
Blower
Blower motor output (W)
Blower speed
Air flow (Cooling High *3) (m³/h)
Air flow (Heating High *3) (m³/h)
External static pressure (Pa)
(Upper limit)
External static pressure (Pa)
(Standard)
Cooling (high) (dB)
Cooling (Medium) (dB)
Cooling (Low) (dB)
Heating (high) (dB)
Heating (Medium) (dB)
Heating (Low) (dB)
Height (mm)
Depth (mm)
Liquid side (mm)
Gas side (mm)
Wireless remote controller
Remote controller holder
Mounting screws
Drain hose
Elbow thermal-insulation cover
Batteries (Manganese)
Black screws
Tapping screws
Owner’s manual
Installation manual
RAS-M10GDV-E RAS-M13GDV-E RAS-M16GDV-E
2.7 3.7 4.5
1
*
4.0 5.0 5.5
1
*
220 – 240 V – 1 Ph – 50 Hz / 220 V – 1 Ph – 60 Hz
Multi-blade blower
5 (Low, Low+, Med, Med+, High)
720 780 780
720 780 780
54.9 63.7 63.7
(5.6 mmAq) (6.5 mmAq) (6.5 mmAq)
35.3 41.2 41.2
(3.6 mmAq) (4.2 mmAq) (4.2 mmAq)
31 32 33
27 28 29
23 24 25
32 33 34
28 29 30
24 25 26
Ø6.35 Ø6.35 Ø6.35
Ø9.52 Ø9.52 Ø12.7
4 wires : includes earth
1
*
1
*
0.59
110
81
60
230
750
440
19
Full Operation
R410A
21 – 32 / 0 – 28
1
1
2 (Ø3.5 x 16 L)
1
1
2
2
16
1
1
1
*
1
*
1 : Refer to the service manual of the outdoor unit to be combined.
*
2 : Electrical characteristics at High fan speed under standard static pressure.
*
3 : Airflow volume at standard static pressure.
*
4 : Sound levels at standard static pressure are measured under the conditions specified by JIS B 8616.
*
Notes :
• For performance when each indoor unit combined with other unit, refer to the service manual of outdoor unit.
• The specification may be subject to change without notice for purpose of improvement.
– 6 –
RAS-M10GDCV-E, RAS-M13GDCV-E, RAS-M16GDCV-E (Cooling Only Model)
Indoor unit model name
Cooling capacity (kW)
Cooling capacity range (kW)
Power supply (Ø-V-Hz)
Electric characteristics
2
*
Blower unit Air flow (Cooling High *3) (m³/h)
Sound level *4 Cooling (Medium) (dB)
Dimension Width (mm)
Net weight (kg)
Connecting type
Connecting pipe
Refrigerant
Wiring connection Interconnection
Usable temperature range (°C)
Accessory
Operation current (A)
Power consumption (W)
Power factor (%)
Blower
Blower motor output (W)
Blower speed
External static pressure (Pa)
(Upper limit)
External static pressure (Pa)
(Standard)
Cooling (high) (dB)
Cooling (Low) (dB)
Height (mm)
Depth (mm)
Liquid side (mm)
Gas side (mm)
Wireless remote controller
Remote controller holder
Mounting screws
Drain hose
Elbow thermal-insulation cover
Batteries (Manganese)
Black screws
Tapping screws
Owner’s manual
Installation manual
RAS-M10GDCV-E RAS-M13GDCV-E RAS-M16GDCV-E
2.7 3.7 4.5
1
*
220 – 240 V – 1 Ph – 50 Hz / 220 V – 1 Ph – 60 Hz
Multi-blade blower
5 (Low, Low+, Med, Med+, High)
720 780 780
54.9 63.7 63.7
(5.6 mmAq) (6.5 mmAq) (6.5 mmAq)
35.3 41.2 41.2
(3.6 mmAq) (4.2 mmAq) (4.2 mmAq)
31 32 33
27 28 29
23 24 25
Ø6.35 Ø6.35 Ø6.35
Ø9.52 Ø9.52 Ø12.7
4 wires : includes earth
1
*
0.59
110
81
60
230
750
440
19
Full Operation
R410A
21 – 32
1
1
2 (Ø3.5 x 16 L)
1
1
2
2
16
1
1
1
*
1 : Refer to the service manual of the outdoor unit to be combined.
*
2 : Electrical characteristics at High fan speed under standard static pressure.
*
3 : Airflow volume at standard static pressure.
*
4 : Sound levels at standard static pressure are measured under the conditions specified by JIS B 8616.
*
Notes :
• For performance when each indoor unit combined with other unit, refer to the service manual of outdoor unit.
• The specification may be subject to change without notice for purpose of improvement.
– 7 –
230
156.5
228
(Inside flange)
Duct connecting flange
(Require at site)
3. CONSTRUCTION VIEWS
650 (Inside flange)
Drain piping connecting port
(Nominal Ø20 Vinyl chloride pipe)
31
730 (Hanging bolt pitch)
Drain-up kit
RB-F81E2
(Accessory sold separately)
200
142
440
Duct connecting flange
(Require at site)
216.2
(Inside flange)
750
640 (Inside flange)
29.7
350
(Hanging bolt pitch)
Gas side D
Model
M10
M13
19.7
M16
24.5
612
40
118 211
Refrigerant pipe
connecting port
(Liquid side Ø6.35)
D
Ø9.52
Ø12.7
– 8 –
13
INFRARED RAYS
KIT commande filaire RBC-SHA1LE2
RECEIVING AND
INDICATING PARTS
1
BLK
9
9
WHI
8
8
GRY
7
7
GRN
6
6
BLU
5
5
YEL
4
4
ORN
3
3
MCC-5026
SWITCH P.C. BOARD
RED
2
2
BRW
1
1
4. WIRING DIAGRAM
4
~
WHI
1
1
BLK
2
2
RED
3
3
BLU
4
4
BLU
5
5
1 2
3 4 5
1 2 3 4 5
CN11
9
9
8
8
7
7
6
6
5
5
CN05
4
4
3
3
2
2
1
1
1 2
1 2
CN17 CN04 CN03
TRANSFORMER
1
3
RED
WHI
1
3
RED
YEL
BLK
BLU
ORN
1 2
1 2 1 2 3
CN20
3
FUSE
T6, 3A, AC 250V
CN01
R01
CN19
BLK
WHI
220 –240V
CONNECTION
CABLE
2
INDOOR
TERMINAL
BLOCK
50Hz
220V ~60Hz
EARTH
EARTH
HEAT
EXCHANGER
SENSOR
(TC)
THERMO
SENSOR
(TA)
FLOAT
SWITCH
212
DRAIN-UP KIT
(OPTION)
Check items
OPERATION
1
indicator
Terminal
2
block
Fuse
3
6.3A
DC 5V
4
DC 12V
5
CN06
1
1
3
3
BLK
BLK
BLK
BLK
212
212
1
CN12
1
CN13
MAIN P.C. BOARD
R02
R03
RY01
SG01
CN30
CN15
WHI
5
BLK
3
RED
1
MCC-875
BLK
BLK
1
2
CN07
CN09
CN14
4321
P02P03
1
BLU
3
PUR
2
GRY
1
5
MF-CAPA
Table 4-1-1 Quick check for failure diagnosis
Diagnosis result
Check to see if the OPERATION indicator goes on and off when the main
switch or breaker is turned on. (Check the transformer and receiver unit.)
Check the power supply voltage between and . (Refer to the name
plate.) (Check the primary and secondary voltage of the transformer.)
Check for fluctuate voltage between
Check to see if the fuse blows out.
(Check the R01 of the Varistor.)
Check the voltage between and on CN11 connector.
(Check the transformer and the power supply circuit of the rated voltage.)
Check the voltage between and on CN14 connector.
(Check the transformer and the power supply circuit of the rated voltage.)
and .
GRY
GRY
DRAIN-PUMP
MOTOR
DRAIN-UP KIT
(OPTION)
BLK
3
3
WHI
2
2
RED
1
1
BLU
3
3
PUR
2
2
GRY
1
1
FAN MOTOR
Color
Identification
BRW : BROWN
RED : RED
WHI : WHITE
YEL : YELLOW
BLU : BLUE
BLK : BLACK
GRY : GRAY
PNK : PINK
ORN : ORANGE
GRN : GREEN
PUR : PURPLE
GRN : GREEN &
&YEL YELLOW
Refer to the service data for the detailed f ailure diagnosis.
– 9 –
5-1. Indoor Unit
5. SPECIFICATIONS OF ELECTRICAL PARTS
No.
1
Fan motor (for indoor)
2
Thermo. sensor (TA-sensor)
3
Transformer
4
Microcomputer
5
Heat exchanger sensor
(TC-sensor)
6
Line filter (L02)
Running capacitor
7
(for indoor fan motor)
8
Fuse (F01)
9
Varistor (R01, R02, R03)
10
Drain pump control relay
Parts name
Type
MF-200-60-4R
( – )
TT-03-3
TMP87PM40ANG
( – )
HF-2430-253Y0R8
CMPS45B155UYF
CMPS45B305UYF
TSCR6.3A
15G471K
G2R-1-H
Specifications
Output (Rated ) 60W, 4 pole, 1 phase,
220 – 240, 50Hz/220, 60Hz
Winding resistance (Ω)
at 20°C
10kΩ at 25°C
AC 240V, Secondary DC 15V/DC 500mA
10kΩ at 25°C
25mH, AC 0.8A
1.5µF, AC 450V (M10, M13)
3.0µF, AC 450V (M16)
T6.3A, AC 250V
470V
10A, AC 250V
M coil A coil
73.8 100
– 10 –
6. REFRIGERANT CYCLE DIAGRAM
RAS-M10GDV-E, RAS-M10GDCV-E
RAS-M13GDV-E, RAS-M13GDCV-E
Connecting pipe
Thickness : 0.8mm
Ø9.52
RAS-M16GDV-E, RAS-M16GDCV-E
INDOOR UNIT
Evaporator
TA
•
Multi-blade fan
Connecting pipe
Thickness : 0.8mm
Ø6.35
Sectional shape
of heat insulator
OUTDOOR UNIT
TC
∗2
∗2
Allowable pipe length
Allowable height difference
Connecting pipe
Thickness : 0.8mm
Ø12.7
INDOOR UNIT
Evaporator
TA
•
Multi-blade fan
Connecting pipe
Thickness : 0.8mm
Ø6.35
Sectional shape
of heat insulator
OUTDOOR UNIT
TC
∗2
∗2
Allowable pipe length
Allowable height difference
NOTE : Gas leak check position
Refrigerant flow (Cooling)
Refrigerant flow (Heating)
∗1
∗1: Heat pump model only
∗2: The allowable pipe length, charge amount of refrigerant, and allowable height difference differ according to
the outdoor unit to be combined. For details, refer to the service manual of the outdoor unit to be combined.
– 11 –
7-1. Indoor Unit
Heat Exchanger Sensor
7. CONTROL BLOCK DIAGRAM
Indoor Unit P.C. Board (MMC-875)
M.C.U
Functions
Operation Display
Temperature Sensor
Infrared Rays Signal Receiver
Infrared
Rays
Initializing Circuit
Clock Frequency
Oscillator Circuit
Power Supply
Remote
Controller
Noise Filter
From Outdoor Unit
Circuit
• Drain Pump Control
• 3-minutes Delay at Restart for Compressor
• Motor Revolution Control
• Processing
(Temperature Processing)
• Timer
• Serial Signal Communication
Drain Pump ON/OFF Signal
Drain Pump Relay
Serial Signal Transmitter/Receiver
Serial Signal Communication
Timer Display
Check Display
Indoor Fan Motor
Voltage setup &
TEMPORARY Switch
Float Switch
Drain Pump
Option
Remote controller
RAS-M10GDV-E, M13GDV-E, M16GDV-E
(Heat Pump Model)
Wireless Remote Controller
Operation (START/STOP)
Operation Mode Selection
AUTO, COOL, DRY, HEAT
Thermo. Setting
Fan Speed Selection
ON TIMER Setting
OFF TIMER Setting
ECO (SLEEP)
Infrared
Rays
RAS-M10GDCV-E, M13GDCV-E, M16GDCV-E
(Cooling Only Model)
Infrared
Rays
Wireless Remote Controller
Operation (START/STOP)
Operation Mode Selection
AUTO, COOL, DRY, FAM ONLY
Thermo. Setting
Fan Speed Selection
ON TIMER Setting
OFF TIMER Setting
ECO (SLEEP)
Hi-POWER
Hi-POWER
– 12 –
8. OPERATION DESCRIPTION
8-1. Outline of Air Conditioner Control
This air conditioner is a capacity-variable type air
conditioner, which uses AC motor for the indoor fan
motor and DC motor for the outdoor fan motor. And
the capacity-proportional control compressor which
can change the motor speed in the range around
from 20 to 100 rps is mounted. The AC motor drive
circuit is mounted to the indoor unit. The compressor and the inverter to control outdoor fan motor are
mounted to the outdoor unit. The entire air conditioner is mainly controlled by the indoor unit controller.
The indoor unit controller drives the indoor fan motor
based upon command sent from the remote controller, and transfers the operation command to the
outdoor unit controller.
The outdoor unit controller receives operation
command from the indoor unit side, and controls the
outdoor fan and the pulse modulating v alve. (PMV)
Besides, detecting revolution position of the compressor motor, the outdoor unit controller controls
speed of the compressor motor by controlling output
voltage of the inverter and switching timing of the
supply power (current transfer timing) so that motors
drive according to the operation command.
And then, the outdoor unit controller transfers
reversely the oper ating status information of the
outdoor unit to the indoor unit controller.
As the compressor adopts four-pole
brushless DC motor, the frequency of the
supply power from inverter to compressor
is two-times cycles of the actual number of
revolution.
1. Role of indoor unit controller
The indoor unit controller judges the operation
commands from the remote controller and performs the following functions .
• Judgment of suction air temperature of the
indoor heat exchanger by using the indoor temp.
sensor.
• Temperature setting of the indoor heat ex-
changer by using heat exchanger sensor
(Prevent-freezing control)
• Indoor fan motor operation control
• LED display control
• Transferring of operation command signal
(Serial signal) to the outdoor unit
• Reception of information of operation status
(Serial signal including outside temp. data) from
the outdoor unit and judgment/display of failure.
2. Role of outdoor unit controller
Receiving the operation command signal (Serial
signal) from the indoor unit controller, the outdoor
unit performs its role.
• Compressor operation
control
• Operation control of
outdoor fan motor
• PMV control
• Detection of inverter input current and current
release operation
• Over-current detection and prevention operation
to transistor module (Compressor stop function)
• Compressor and outdoor fan stop function
when serial signal is off (when the serial signal
does not reach the board assembly of outdoor
control by trouble of the signal system)
• Transferring of operation information (Serial
signal) from outdoor unit to indoor unit
• Detection of outdoor temperature and operation
revolution control
• Defrost control in heating operation ((Heat
pump model only.) Temp. measurement by
outdoor heat exchanger and control f or 4-way
valve and outdoor fan)
3. Contents of operation command signal (Serial
signal) from indoor unit controller to outdoor unit
controller
The following three types of signals are sent from
the indoor unit controller.
• Operation mode set on the remote controller
• Compressor revolution command signal defined
by indoor temperature and set temperature
(Correction along with variation of room temperature and correction of indoor heat exchanger temperature are added.)
• For these two types of signals ( [Operation
mode] and [Compressor revolution] ), the
outdoor unit controller monitors the input current
to the inverter, and performs the f ollowed
operation within the range that current does not
exceed the allow ab le value.
• Temperature of indoor heat exchanger by indoor
heat exchanger sensor
(Minimum rev olution control)
Operations fol-
lowed to judgment
of serial signal
from indoor side.
– 13 –
4. Contents of operation command signal (Serial
signal) from outdoor unit controller to indoor unit
controller
The following signals are sent from the outdoor
unit controller.
• The current operation mode
• The current compressor revolution
• Outdoor temperature
• Existence of protective circuit operation.
For transferring of these signals, the indoor unit
controller monitors the contents of signals, and
judges existence of trouble occurrence .
Contents of judgment are described below .
• Whether distinction of the current operation
status coincide with the operation command
signal
• Whether protective circuit operates
When no signal is received from the outdoor
unit controller, it is assumed as a trouble.
8-1-1. Capacity Control
The cooling capacity is varied by changing compressor motor speed. The inverter changes compressor
motor speed by changing AC 220 – 240V po w er to
DC once, and controls capacity by changing supply
power status to the compressor with transistor
module (includes 6 transistors). The outline of the
control is as follows : The re volution position and
revolution speed of the motor are detected by detecting winding electromotive force of the compressor
motor under operation, and the rev olution speed is
changed so that the motor drives based upon revolution speed of the operation command by changing
timing (current transfer timing) to e xchange inverter
output voltage and the power supply to the winding.
Detection of the revolution position for controlling is
performed 12 times per 1 rev olution of compressor.
The range of supply power frequency to the compressor differs according to the operation status.
8-1-2. Current Release Control
The outdoor main circuit control section (Inverter
assembly) detects the input current to the outdoor
unit. If the current value with compressor motor
speed instructed from indoor side exceeds the
specified value, the outdoor main circuit control
section controls compressor motor speed by reducing motor speed so that value becomes closest to
the command within the limited value.
8-1-3. Indoor Fan Control (AC Fan Motor)
The indoor fan is operated by motor speed non-step
variable AC phase control drive system. For airflow
rate, motor speed is controlled manually in five steps
(LOW, LOW+, MED, MED+, HIGH), or automatically
adjusted in AUTO mode according to the room
temperature. It is not selected by relay, so the
switching noise will not be heard.
Table 8-1-1 shows the f an speed.
This indoor unit performs the phase output
constant control of the fan motor.
(Does not control the revolution speed.)
Since the fan speed varies according to the external
static pressure, the values described in the table can
be used to confirm the motor functions. However, the
maximum rev olution speed is limited to 1300rpm for
protection of the terminal voltage of the running
capacitor.
Operation mode
COOL
HEAT
Fan mode
H
L
H
L
Table 8-1-1 Reference fan speed
Fan speed (rpm)
M10 M13 M16
900 to 1150 950 to 1200 1000 to 1250
600 to 800 650 to 850 700 to 900
900 to 1150 950 to 1200 1000 to 1250
650 to 850 700 to 900 750 to 950
– 14 –
8-2. Description of Operation Circuit
• Turning [ON] the break er will flash the oper ation
lamp.
This is the display of pow er-ON (or notification of
power f ailure).
• When pushing [START/STOP] button on the
remote controller, receive sound is issued from the
main unit.
8-2-1. Fan Only Operation
(The Remote controller MODE Button
is Set to the FAN ONLY Operation)
• Once the setting is made, the operation mode is
memorized in the microcomputer so that the same
operation can be effected thereafter simply b y
pushing [START/ST OP] b utton.
• When the FAN b utton is set to the AUTO position,
the indoor fan motor operates as shown in Fig.
8-2-1. When the FAN SPEED button is set
manually, the motor operates with a constant air
flow.
• ECO mode cannot be set.
˚C
Set
temp.
(Room temp.) – (Set temp.)
+3
+2.5
+2
+1.5
+1
+0.5
0
(Set temp.) 25˚C
M+
*1
*1
*1
L–
8-2-2. Cooling Operation
(The Remote controller MODE Button
is Set to the COOL Position)
• Once the setting is made, the operation mode is
memorized in the microcomputer so that the same
operation can be effected thereafter simply b y
pushing [START/ST OP] b utton.
• A cooling operation signal is transmitted to outdoor
unit.
• The indoor fan motor operates as shown in Fig.8-22 when FAN button is set to AUTO.
• The motor operates with a constant air flow when
the FAN button is set manually.
• The outdoor unit controls the outdoor fan and the
compressor motor speed according to the operation command signal sent from the indoor unit.
˚C
+3
M+
*1
*1
*1
L–
In normal
operation
Set
temp.
+2.5
+2
+1.5
+1
(Room temp.) – (Set temp.)
+0.5
0
–0.5
NOTE :
1: Calculated from the difference in the motor speed
*
of M+ and L–.
Fig. 8-2-2 Setting of air flow [Air Flow AUTO]
NOTE :
1: Calculated from the difference in the motor speed
*
of M+ and L–.
Fig. 8-2-1 Auto setting of air flow
1. Cooling capacity control
• The cooling capacity and room temperature are
controlled by changing the compressor motor
speed according to both the difference between
the temperature detected by the room temperature sensor and the temperature set by TEMP
button and also any change in room temperature.
• When compressor has been activated or
reactivated, compressor motor speed goes up
with restricting the maximum speed gradually
from operation start.
• When room temperature is lower than set
temperature, indoor fan motor is operated at fan
speed L– as shown in Fig. 8-2-2 while the
outdoor unit stops.
– 15 –
2. Prevent-freezing control
If temperature of indoor heat exchanger detected
by the indoor heat exchanger sensor is 4 °C or
lower, compressor motor speed is gradually
lowered to pre vent freezing of the indoor heat
exchanger. If temperature is 6°C or higher, return
the operation to the above item 1.
3. Limit for maximum compressor motor
speed by indoor fan speed
When outdoor temperature sensor detected 32°C
or lower, and indoor heat exchanger sensor
detected 15°C or lower, the maximum compressor motor speed is limited by the indoor f an
speed.
8-2-3. DRY Operation
(The Remote controller MODE Button
is Set to the DRY Position)
• Once the setting is made, the operation mode is
memorized in the microcomputer so that the same
operation can be effected thereafter simply b y
pushing [START/ST OP] b utton.
• Dry operation signal is transmitted to outdoor unit.
• The Cooling operation giving priority to dehumidify-
ing, which restrains the indoor fan speed and
compressor motor speed, is performed.
• The indoor fan motor operates as shown in Fig. 8-
2-3. (Fan speed is AUTO only.)
• The outdoor unit controls the outdoor fan relay and
the compressor motor speed according to the
operation command signal sent from the indoor
unit.
1. Dehumidifying-preferential Cooling capacity control
• The cooling capacity and room temperature are
controlled by changing the compressor motor
speed according to both the difference between
the temperature detected by the room temperature sensor and the temperature set by TEMP
button and also any change in room temperature.
• When the air conditioner operates in Dry mode,
the maximum compressor motor speed is
restricted.
While multiple indoor units operate, compressor
motor speed is calculated in the outdoor unit to
operate.
• When room temperature is lower than set
temperature, indoor fan motor is operated at fan
speed UL as shown in Fig. 8-2-3 while the
outdoor unit stops.
• Other controls than the above-mentioned
controls are common to those of Cooling
operation.
8-2-4. Heating Operation
(Heat pump model only)
Transferring of heating operation signal from indoor
unit to outdoor unit starts.
The indoor fan motor operates b y the room temper ature when selecting “AUTO” of “FAN” as shown in Fig.
8-2-4, and operates with a set air flow when selecting
“Low” to “High”.
However, to prev ent cold draft, revolution speed of
the fan is restricted by indoor heat exchanger temperature when air flow is AUTO (Fig. 8-2-5) and
starting of FAN Manual.
+2.5
+2.0
+1.5
+1.0
+0.5
(Room temp.) – (Set temp.)
Set
temp.
0
–0.5
NOTE :
1 : Middle motor speed betw een L– and UL
*
Fig. 8-2-3 Setting of air flo w
L–
*1
UL
[Basic control]
NOTE :
1, *2 : Approximate revolution speed of M+ and L to
*
– 16 –
Set
temp.
(Room temp.) –
–0.5
–1
–1.5
–2
(Set temp.)
–5.0
–5.5
[FAN AUTO]
0
linear according to temperature.
Fig. 8-2-4 Setting of air flo w
LOW
1
*
2
*
M+
HIGH
[Cold draft preventing control]
The upper limit of fan revolution speed is shown
below.
TC
(˚C)
44
43
31
30
A + 4
A – 8
FAN
AUTO
33
32
20
19
2
*
A
A – 8
Starting
of FAN
Manual
HIGH
Approximate
revolution speed
of HIGH and SUL
linear by Tc.
3
*
SUL
( NOTE : *1)
SUL
Stop
NOTES :
1 Stops for 2 minutes after thermostat-OFF.
*
224°C when the set temp. is 24°C or more
*
Set temp. when the set temp. is belo w 24°C
3 SUL : Super ultra low
*
Fig. 8-2-5 Cold draft preventing control
The outdoor unit controls the outdoor fan based upon
the operation signal sent from the indoor unit, and
also controls revolution speed of the compressor
motor.
The power coupler for 4-way valve is turned on, and
turned off in defrost operation.
1. Heating capacity control
Calculate the difference between temperature
detected by room temp. sensor every minute and
the set temp. set on “Temp. indicator” and variation amount of room temp.
Then, obtain the correction amount of the command signal, and correct the current frequency
command signal.
2. High-temp. release control
If temperature of the indoor heat exchanger
detected by the indoor heat exchanger sensor is
58°C or higher, compressor motor speed is
gradually lowered to prevent over-temp. rising of
compressed pressure.
If temperature becomes below 51°C, return to
above item 1.
3. Defrost control
1) Detection of frost
In heating operation, time duration while the
compressor operates is counted, and defrost
operation starts by any condition described
below.
a. The counted time is 28 minutes or more,
and status that temperature of the outdoor
heat exchanger detected by the outdoor
heat exchanger is –20°C or low er continued for 3 minutes or more.
b. The counted time is 28 minutes or more,
and status that temperature of the outdoor
heat exchanger detected by the outdoor
heat exchanger is –8°C or low er and
temperature lowered by 2.5 °C than the
minimum value of the outdoor heat e x changer during 10 to 15 minutes count time
continued for 3 minutes or more .
c. The counted time is 34 minutes or more,
and status that temperature of the outdoor
heat exchanger detected by the outdoor
heat exchanger is –5°C or low er and
temperature lowered by 3.0 °C than the
minimum value of the outdoor heat e x changer during 10 to 15 minutes count time
continued for 3 minutes or more .
d. The counted time is 4 hours or more, and
status that temperature of the outdoor heat
exchanger detected by the outdoor heat
exchanger is 0°C or lower and temper ature
lowered by 1.0 °C than the minimum value
of the outdoor heat exchanger during 10 to
15 minutes count time continued for 3
minutes or more.
e. If the following three conditions are satis-
fied, defrost operation (Timer defrost) starts
after heating operation for 48 minutes.
Setting on remote controller, HEAT
(mode), HIGH (Fan), 30°C (temp.).
Room temp. is 19°C to 24°C, and
outside air temp. is 5°C or lower.
Defrost operation has been already
performed once.
2) Defrost operation
Operation of the compressor is stopped once,
turn off power coupler for 4-way valve after 10
seconds, and then exchange the
4-way v alv e.
After 20 seconds, restart operation of the
compressor. Turn off the outdoor fan just when
the compressor stopped.
If temperature of the indoor heat exchanger is
lower than settimg temperature, stop the
indoor fan.
– 17 –
3) Defrost reset
Resetting operation from defrost to heating is
performed when any one of the following
conditions is satisfied.
a. Temperature of the outdoor heat exchanger
rose to +8°C or higher.
b. A status that temperature of the outdoor
heat exchanger is +5°C or higher continued
for 80 seconds.
c. Defrost operation continued for 10 minutes .
In resetting defrost operation, the compressor
stops for 50 seconds if defrost has started
under condition a. to d. in item 1, but the
compressor is reset to heating operation
keeping operated if defrost has started under
condition e. in item 1.
8-2-6. ECO Timer Operation
When you push the ECO button during cooling, Dry,
Heating, or A operation, the air conditioner will start
the following operation.
The fan speed will be automatically controlled.
• Cooling operation / Dry operation
In the operation suppression zone, where capacity
is kept to the minimum, overcooling is prevented by
raising the temperature setting by 1°C after 1 hour
and by 2°C after 2 hours of operation.
The room temperature is thus regulated between
the operation suppression zone and the set temperature.
Operation suppression zone
8-2-5. Auto Operation
1. Selection of operation mode
As shown in Fig. 8-2-6, the operation starts by
selecting automatically the status of the room
temperature (Ta) when starting AUTO oper ation.
Ts : Setting temper ature by remote controller
Ta
Cool operation
Ts + 1
Minitoring (Fan only)
Ts – 1
Heating operation (Heat pump model)
Fan only operation (Cooling only model)
*1 When reselecting the operation mode, the fa n
speed is controlled by the previous oper ation
mode.
Operation start
1˚C
1 hour
2 hours
2˚C
Room
temperature
Set
temperature
Fig. 8-2-7
• Heating operation
(Heat pump model only)
In the operation suppression zone, where capacity
is kept to the minimum, ov erheating is prevented by
lowering the temperature setting by 1°C after 1
hour and by 2°C after 2 hours of operation.
The room temperature is thus regulated between
the set temperature and the operation suppression
zone.
Set temperature
Room
2˚C
temperature
Operation
suppression zone
Operation start
1˚C
1 hour
2 hours
Fig. 8-2-8
Fig. 8-2-6
2. Mode selection is done again if the cpmpressor
turns off for 15 minutes continuesly, due to the
room temperature.
8-2-7. High POWER Operation
When you push the Hi-POWER button during Cooling, Heating, or A operation, the air conditioner will
start the following operation. (A operation : Auto
change over)
• Cooling operation
Performs the cooling operation at 1°C low er than
the setting temperature.
When the room temperature is above the setting
temperature. In addition, fan speed is high*.
* Noise level r aises in accordance with fan speed.
• Heating operation (Heat pump model only)
Performs the heating operation at 2°C higher than
the setting temperature.
– 18 –
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