Carrier 42NQ018N User manual

42NQ018N / 38NY018N
SERVICE MANUAL
AIR CONDITIONER
SPLIT WALL TYPE
FILE NO. SVM-10035-1
Revised Apr, 2010

–1–
FILE NO. SVM-10035
CONTENTS
1. SPECIFICATIONS
2. CONSTRUCTION VIEWS
2-1 Indoor Unit
2-2 Outdoor Unit
3. WIRING DIAGRAM
4. SPECIFICATION OF ELECTRICAL PARTS
4-1 Indoor Unit
4-2 Outdoor Unit
5. REFRIGERATION CYCLE DIAGRAM
6. CONTROL BLOCK DIAGRAM
7. OPERATION DESCRIPTION
7-2Outline of Air Conditioner Control
7-3Description of Operation Circuit
7-4Description of Safety and Reliability Prevention Function
7-5ECO Operation
7-6FILTER check lamp
7-7Auto Restart Function
7-1 Remote control
8. INSTALLATION PROCEDURE
8-1 Safety Cautions
8-2 Installation Diagram of Indoor and Outdoor Units
8-3 Installation
8-4 Indoor Unit
8-5 Outdoor Unit
8-6 Others

FILE NO. SVM-10035
9-5Troubleshooting Flowcharts
Troubleshooting for Wiring
HOW TO REPLACE THE MAIN PARTS
9. TROUBLESHOOTING CHART
9-1 Troubleshooting Procedure
9-2 Basic Check Items
9-3 Primary Judgement
9-4 Self-Diagnosis by Remote Control (Check Code)
9-6
9-7Troubleshooting for P.C. Board
9-8Troubleshooting for Remote Control
10.
10-1 Indoor Unit
10-2 Outdoor Unit
11. EXPLODED VIEWS AND PARTS LIST
11-1 Indoor Unit (E - Parts Assy)
11-2 Indoor Unit
11-3 Outdoor Unit
–2–

−3 −
FILE NO. SVM-10035
1. SPECIFICATIONS
MODEL
ITEM Cooling Heating
kW
Phase
V
Hz
Power consumption kW
Power factor %
Running Indoor A
Current Outdoor A
Starting current A
Moisture removal lit/h
Noise Indoor (H/M+/M/L+/L) dB
Outdoor dB
Refrigerant Name of refrigerant
Rated amount kg
Refrigerant control
Interconnection Gas side size mm
pipe Connection type
Liquid side size mm
Connection type
Maximum length m
(One way)
Maximum height m
difference
INDOOR UNIT
Dimensions Height mm
Width mm
Depth mm
Net weight kg
Evaporator type
Indoor fan type
Airflow volume High fan m3/h
Medium fan m3/h
Low fan m3/h
Fan motor output W
Air filter
OUTDOOR UNIT
Dimensions Height mm
Width mm
Depth mm
Net weight kg
Condenser type
Outdoor fan type
Airflow volume m3/h
Fan motor output W
Compressor Model
Output W
Safety device
Louver type
Usable outdoor temperature range °C
Note *1 Chargeless pipe
*2 Maximum pipe
1500
57 57 58
1.53
6.65 6.70 6.35
31
50
1.60
96
1.51 1.55
98 97
42NQ018N/ 38NY018N
240V 220V 240V
15*1
2550 2400 2550
20*2
42NQ018N
1000
840
750
38NY018N
Automatic louver
15 ~ 43 -10 ~ 24
42
PA200X2CS-4KU1
Propeller fan
2400
Finned tube
715
780
290
47
30
Honeycomb woven filter with PP frame
Finned tube
Cross flow fan
1000
900
770
228
13
Flare connection
8
Td Sensor, Fuse, IOL
320
1050
Capillary tube
∅12.7
Flare connection
∅6.35
R410A
56
44/42/39/37/35
2.0
0.30
7.05
1.58
98
5.45 5.565.12
Capacity
Power source
220V
5.10
1∅
220 - 240

– 4–
FILE NO. SVM-10035
Note : 1
•Capacity is based on the following temperature conditions.
Note : 2
•Charge refrigerant according to the table below.
Refrigerant
*1 No need to charge 15 m or less
extra refrigerant
*2 Need to charge Over 15 m up to 20 m (20 g/m)
extra refrigerant
Temperature Condition JIS C9612
Cooling
Indoor unit inlet air temperature (DB) 27°C
(WB) 19°C
Outdoor unit inlet air temperature (DB) 35°C
(WB) 24°C
42NQ018N / 38NY018N

2. CONSTRUCTION VIEWS
2-1 Indoor Unit
FILE NO. SVM-10035
– 5–
65
262.5
40
262.5
215
235
215
235
320
40
10947 215.5 153.5
85 23
65
200
525
278 200 222 150
6)
Hanger 8~
Hanger Hanger
Center line
10)
Installation plate outline
For stud bold (
For stud bold (
Outline of indoor unit
786
Knock out system
73.5
50
228
7
73.57
Front Panel
Grille Inlet
Knock out system
50
Air filter
Heat exchanger
Air inlet
Air outlet
1050
320
Drain hose (0.5m)
Connecting pipe (0.39m) (Flare 6.35)
Hanger
(Flare 12.70)
Connecting pipe (0.49m)
Hanger
132
7278
50
78
50
72
19
157
Wireless remote controller
56
Remote controller holder
26
125
63

HANDLE
COVER-PV
HANDLE
600
Z View Service port
320
306
A Detail Drawing (Back leg)
Ø
25 Drain outlet
2Ø11x14 Hole
(For Ø8-Ø10 anchor bolt) B
Ø6Hole
Ø11x14 Hole
50
36 R15
R
5.5
Ø6 hole
28
320
86
A
125108
600 or more
Air out
let
320
600
Air inlet
4xØ11 Long holes(For Ø8- Ø10 anchor bolt)
Gas-side
(FlareØ 12.70)
Liquid side
(Flare Ø6.35)
90 600 90 69 342
320
Z
50
36 R15
B Detail Drawing (Front leg)
Ø436
FAN-GUARD
715
290
275
600 or more
84
129
54
Electrical part cover
320
306
100 or more
100 or more
Installation dimension
2.2Outdoor Unit
FILE NO. SVM-10035
– 6–

3
12
TRANSFORMER
MAINP.C. BOARD (MCC-890)
OUTDOOR
UNIT
GRN&YEL
FERRITE CORE
DISCHARGE
PIPE
SENSOR (TD)
HEAT
EXCHANGER
SENSOR (TE)
CN08
CN07
BLU
BLU
BLK
BLK
11
2
33
11
2
33
RED
RED
BLK
BLK
MAGNETIC
CONTACTOR
A1
A2
52C
1/L1 5/L3
2/T1 6/T3
PNK
WHI BLK WHI BLK BLK
COIL FOR
4 WAY VALVE
RED
RED
RED
CAPACITOR CAPACITOR
BLK
BLK
WHI
RED CN01
CN05
GRY
1
3
5
7
9
1
3
5
7
9
BLK
BLK
RED
RED
11
33
11
33
2
CN11
BLU
YEL
1
3
1
3
1
1
3
CN02
BLU
BLU
11
33
CN03
F01
250VAC T6. 3A
CR11
CR12
CR13
RY07
RY05
RY06
SG01
CN06
TNR
R74
TNR
R73
COMPRESSOR FAN MOTOR
OUTDOOR
TERMINAL
BLOCK
LN3
1 2
S
R
C
POWER SUPPLY
220-240V~ 50Hz
i
CHASSIS
3. WIRING DIAGRAM
–7–
FILE NO. SVM-10035

− 8−
FILE NO. SVM-10035
4. SPECIFICATION OF ELECTRICAL PARTS
4-1. Indoor Unit
SWT-77 DC 7V, 12V
No. Parts name Type Specifications
1Fan motor (for indoor) ICF-340-30-2B DC 340V, 30W
2Thermo sensor (TA-sensor) 10k at 25 C
3 Switching Transformer (T01)
4Microcontroller unit (IC15)TMP87CM40ANG-6P68
5 Heat exchanger sensor 10k at 25 C
(TC-sensor)
6Line filter (L01) LC*SS11V-R06270
27mH, 600mA
7Bridge rectifier (DB01) D3SBA60 4A, 600 V
8Capacitor (C03)
EKMH451VSN121MQ35S
120mF, 450V
9Fuse (F01) BET6.3A T6.3A, 250VAC
10 Varistor (R09, R10)SR561K14DO560 V
11 Resistor (R01 )
RF-5TK1R8
1.8 , 5W
12 Louver motor MP24Z3T 12VDC
W
W
W
°
°
4-2. Outdoor Unit
Output (Rated) 1500W, 2poles, 1 phase, 220 −240V, 50Hz
1Compressor PA200X2CS-4KU1 Winding resistance (Ω)Red-BlackWhite-Black
(at 20°C) 1.85 2.62
Output (Rated) 42W, 4poles, 1 phase, 220 – 240V, 50Hz
2Fan motor (for outdoor) FG-240-42A-1 Winding resistance (Ω)Red-BlackWhite-Black
(at 20°C) 128 126
3Running capacitor DS451305NPQB AC 450V, 3.0µF
(for fan motor)
4Running capacitor B32332I5606J063 AC 450V, 50µF
(for compressor)
5Solenoid coil VHV (STF) AC 220 −240V
(for 4-way valve)
6Thermo sensor TE / TD 10kΩat 25°C / 50kΩat 25°C
7Magnetic contactor A23T 220 −240V, 50Hz
8Transformer TT-05 220 −240V
9Microcomputer TMP47C840N
No. Parts name Type Specifications
10 Varistor (R73, R74) 15G471K 470V
11 Fuse (F01) TSCR T6.3A, 250V

–9–
FILE NO. SVM-10035
5. REFRIGERATION CYCLE DIAGRAM
Discharge Muffler
∅ 25x160L
Heat exchanger
Indoor unit
Cross flow fan
Cooling
Heating
4-way valve
Heating Cooling Compressor
Accumulator
Heat exchanger
Propeller fan
Outdoor unit
Capillary tube
Æ2.0 x 1000
Capillary tube
Æ1.7 x 600
PA200X2CS-4KU1
Cooling
Heating Mark ( ) means check points of Gas Leak.
O.D.:12.7 mm O.D.:6.35 mm
Cooling
Heating
Packed valve
(Æ12.7)
Packed valve
(Æ6.35)
0.39 m
(Connecting pipe) 0.49 m
(Connecting pipe)
T1
P
Refrigerant
R410A : 1.53 kg.
Æ12.7 Æ6.35
Ambient temp.
conditions DB/WB
(°C)
Indoor Outdoor
Standard 2.53 42.0 High 20/15 7/6
Heating Overload*1 3.30 ~ 3.65 51.0 ~ 55.0 Low27/-24/18
Low temperature 1.75 32.0 High 20/
Standard 0.94 11.0 High 27/19 35/24
Cooling Overload 1.12 15.0 High 32/23 43/26
Low temperature 0.72 4.2 Low21/15 21/15
Standard
pressure
P
(MPaG)
Surface temp. of heat
exchanger interchanging
pipe
T1
(°C)
Fan speed
(indoor)
50Hz
Note
Measure the heat exchanger temperature at the center of U-bend. (By means of TC sensor)
*1 During heating overload operation, a value for the high temperature limit control operation is included.
l
l
--10/-10
·
·

−10 −
6. CONTROL BLOCK DIAGRAM
FILE NO. SVM-10035
Indoor Unit Control Panel
Heat Exchanger Sensor
Temperature Sensor
Infrared Rays Signal Receiver
Initiallizing Circuit
Clock Frequency
Oscillator Circuit
Power Supply
Circuit
Noise Filter
From Outdoor Unit
AC 220-240V~50Hz
M.C.U.
Functions
•Louver Control
•3-minute Delay at Restart for Compressor
•Motor Revolution Control
•Processing
•Timer
•Serial Signal Communication
Louver ON/OFF Signal
Louver Driver
Serial Signal Transmitter/Receiver
Serial Signal Communication
Operation
Display
Timer
Display
Filter Sign
Display
PRE DEF.
Sign Display
Indoor
Fan Motor
Louver Motor
Infrared
Rays
Remote
Control
(Temperature Processing)
Infrared Rays, 36.7kHz
Remote Controller
Thermo. Setting
Fan Speed Selection
ON TIMER Setting
OFF TIMER Setting
Louver AUTO Swing
Louver Direction Setting
Operation Mode Selection
AUTO, COOL, DRY, HEAT,FAN ONLY
REMOTE CONTROLLER
ECO
Hi-POWER
Operation [ ]
Hi Power
Sign Display

7-1. Remote control
7-1-1. Remote control and its functions
FILE NO. SVM-10035
−11 −
7-1-2. Operation of remote control
1. AUTOMATIC OPERATION
To automatically select cooling, heating, or fan only operation.
1. Press MODE : Select A.
2. Press MODE : Set the desired temperature.
2. COOLING / HEATING / FAN ONLY OPERATION
1. Press MODE : Select Cool , Heat , or Fan only .
2. Press MODE : Set the desired temperature.
Cooling: Min. 17°C, Heating : Max, 30°C, Fan Only: No temperature indication
3. Press : Select AUTO, LOW , LOW+ , MED , MED+ , or HIGH .
13
2
6
7
8
10
18
16
5
4
3
14
15
12
9
11
17
1
Infrared signal emitter
ON
OFF
1Start/Stop button ( )
2Mode select button ( )
3Temperature button ( )
4
Fan speed button ( )
5Swing louver button ( )
6Set louver button ( )
7
On timer button ( )
8
Off timer button ( )
9
Sleep timer button ( )
10 Setup button ( )
11 Clear button ( )
12 Memory and Preset button ( )
13 High power button ( )
14 Economy button ( )
15 Filter reset button ( )
16 Clock reset button ( )
17 Check button ( )
18
3. DRY OPERATION (COOLING ONLY)
For dehumidification, a moderate cooling performance is controlled automatically.
1. Press MODE : Select Dry .
2. Press MODE : Set the desired temperature.
4. Hi-POWER OPERATION
To automatically control room temperature and airflow for faster cooling or heating
Press HI-POWER : Start and stop the operation.
operation (except in DRY and FAN ONLY mode)
7.OPERATION DESCRIPTION

−12 −
FILE NO. SVM-10035
5. ECO OPERATION
To automatically control room to save energy (except in DRY and FAN ONLY mode)
Press : Start and stop the operation.
Note: Cooling operation; the set temperature will increase automatically 1 degree/
hour for 2 hours (maximum 2 degrees increase). For heating operation the
set temperature will decrease.
6. TEMPORARY OPERATION
In case of the misplaced or discharged remote control
•Pressing the RESET button, the unit can start or stop
without using the remote control.
•Operation mode is set on AUTOMATIC
operation, preset temperature is 24°C
and fan operation is automatic speed.
7. TIMER OPERATION
Setting the ON Timer Setting the OFF Timer
Press : Set the desired ON timer. Press : Set the desired OFF timer.
Press : Set the timer. Press : Set the timer.
Press : Cancel the timer. Press
Press : Set the ON timer. Press .
Press : Set the OFF timer. Press button during the ( or )
mark flashing.
1
1
2
3
2
3
3
4
Daily timer allows the user to set both the ON & OFF timers and will be activated on a daily basis.
Setting Daily Timer
· During the daily timer is activation, both arrows are indicated.
( or )
ON OF F
: Cancel the timer
ON
OF F
8. PRESET OPERATION
Set your preferred operation for future use. The setting will be memorized by the
Note:
· Keep the remote control in accessible transmission to the indoor unit;
otherwise, the time lag of up to 15 minutes will occur.
· The setting will be saved for the next same operation.
unit for future operation (except air flow direction).
1. Select your preferred operation.
2. Press and hold for 3 seconds to memorize the setting. The mark
displays.
3. Press : Operate the preset operation.
RESET button

−13 −
FILE NO. SVM-10035
9. AUTO RESTART OPERATION
To automatically restart the conditioner after the power failure (Power of the unit must be on.)
1. Press and hold the RESET button on the indoor unit for 3 seconds to set the
operation. (3 beep sound and OPERATION lamp blink 5 time/sec for 5 secpmds)
•Do not operate ON timer and OFF timer.
2. Press and hold the RESET button on the indoor unit for 3 seconds to cancel the
Setting
operation. (3 beep sound but OPERATION lamp does not blink)
10. SLEEP TIMER OPERATION
To start the sleep timer (OFF timer) operation
Press : Select 1, 3, 5 or 9 hrs for OFF timer operation.

–14 –
1
7
9
8
634
210
5
7-1-3.Name and Functions of Indications on Remote Controller
[Display]
All indications, except for the clock time indicator, are displayed by pressing the button.
1 Transmission mark
This transmission mark indicates when the
remote controller transmits signals to the indoor
unit.
2 Mode indicator
Indicates the current operation mode.
(A : Auto, : Cool, : Heat, : Dry, : Fan only)
3 Temperature indicator
Indicates the temperature setting.
(17to 30)
4
5
FAN speed indicator
Indicates the selected fan speed.
AUTO or five fan speed levels
(
LOW , LOW
+
, MED , MED
+
,
HIGH ) can be shown.
Indicates AUTO when the operating mode is
either AUTO or : Dry.
6
TIMER and clock time indicator
The time setting for timer operation or the clock
time is indicated.
The current time is always indicated except
during TIMER operation.
7
Hi-POWER indicator
Indicates when the Hi-POWER operation starts.
Press the Hi-POWER button to start and press it
again to stop the operation.
8
(PRESET) indicator
Flashes for 3 seconds when the PRESET button is
pressed during operation.
The mark is shown when holding down the
button for more than 3 seconds while the mark is
blinks.
Press another button to turn off the mark.
9
ECO indicator
Indicates when the ECO is in activated.
Press the ECO button to start and press it again
to stop operation.
10
A, B change indicator remote controller
When the remote controller switching function is
set,"B" appears in the remote controller display.
(When the remote controller setting is"A", there is
no indication at this position.)
Indicates when louver is swing.
Press swing button to start the swing operation
and press it again to stop the swing operation.
Swing
FILE NO. SVM-10035
ºCºC

FILE NO. SVM-10035
7-2-1. 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.
7-2-2. Indoor Fan Control
The operation controls the fan speed at indoor unit
side. The indoor fan (cross flow fan) is operated by
the phase control induction motor. The fan rotates in 3
stages in MANUAL mode, and in 3 stages in AUTO
mode, respectively. (Table 7-2-2)
1) When setting the fan speed to L, M or H
on the remote controller, the operation is performed
with the constant speed shown in Fig. 7-2-1
7-2.Outline of Air Conditioner Control
This is a fixed capacity type air conditioner, which uses
a DC motor for an indoor fan. The DC motor drive
circuit is mounted in the indoor unit. And electrical
parts which operate the compressor and the outdoor
fan motor, are mounted in the outdoor unit.
The air conditioner is mainly controlled by the indoor
unit controller. The controller operates the indoor fan
motor based upon commands transmitted by the
remote control and transfers the operation commands
to the outdoor unit.
The outdoor unit receives operation
commands from the indoor unit, and operates the
outdoor fan motor and the compressor.
(1) Role of indoor unit controller
The indoor unit controller receives the operation
commands from the remote control and executes
them.
• Temperature measurement at the air inlet of the
indoor heat exchanger by the indoor
temperature sensor
•Temperature measurement of the indoor heat
exchanger by the heat exchanger sensor
•Louver motor control
•Indoor fan motor operation control
•LED display control
•Transferring of operation commands to the
outdoor unit
•Receiving of information of the operation status
and judging of the information or indication of
error
(2) Role of outdoor unit controller
The outdoor unit controller receives the operation
commands from the indoor controller and
executes them.
•Compressor operation
control
•Operation control of
outdoor fan motor
•Turning off the compressor and outdoor fan
when the outdoor unit receives the shutdown
command
Operations according
to the commands
from the indoor unit
to the setup temperature, room temperature, and heat
2) When setting the fan speed to AUTO on the remote
controller, revolution of the fan motor is controlled
to the fan speed level shown in Table 7-2-2 according
exchanger temperature.
Table 7-2-1 Indoor fan and air flow rate
Table (7-2-1)
3) When setting the fan speed to QUIET on the remote
controller, revolution of the fan motor is controlled
to the fan speed level is L-.
UH H M L L- UL SL
HM LL-
Dry M L L- UL SL
UH H M L L- UL SL
1100 1000 940 870 850 850 750 640 550 550 550
1000 900 840 770 750 750 650 540 450 450 450
rpm
Air flow volume (m3/h)
Heat
42NQ018N
Fan only
Cooling
Model
FAN TAP
1100
1000
OPERATION
MODE
L
L+
M
M+
H
Low
(L + M) / 2
Med
(M + H) / 2
High
Indication Fan speed
–15–

16 -
-
FILE NO. SVM-10035
7-3.Description of Operation Mode
(1) When turning on the breaker, the operation lamp
blinks.This means that the power is on (or the
power supply is cut off.)
(2) When pressing [START/STOP] button on the
remote control, receiving beep sounds from the
indoor unit, and the next operation is performed
together with opening the vertical air flow louver.
(3) Once the operation mode is set, it is memorized in
the microcomputer so that the previous operation
can be effected thereafter simply by pressing
[START/STOP] button.
7-3-1. Fan only operation
([MODE] button on the remote control is set
to the fan only operation.)
(1) When [FAN] button is set to AUTO, the indoor fan
motor operates as shown in Fig. 7-3-1.When
[FAN] button is set to LOW, MED, or HIGH, the
motor operates with a constant air flow.
7-3-2. Cooling operation
([MODE] button on the remote control is set
to the cooling operation.)
(1) The compressor, 4-way valve, outdoor fan and
operation display lamp are controlled as shown in
Fig. 7-3-2.
Fig. 7-3-2
(2) When [FAN] button is set to AUTO, the indoor fan
motor operates as shown in Fig. 7-3-3.When
[FAN] button is set to LOW, MEDor HIGH, the
motor operates with a constant air flow.
*1
*2
*3
+3
+2.5
+2
+1.5
+1
+0.5
-0.5
0
M+
Preset
temp.
°C
(Room temp.) −(Preset temp.)
0.5
0
Preset
temp.
ON ON
OFF OFF OFF ON
Compressor
4-way valve
Outdoor fan
OPERATION
display lamp

(Room temp.) (Preset temp.)
(Preset temp.: 24 °C)
+2
+2.5
+3
°C
+1.5
+1
+0.5
0
M+
*1
*2
*3
(Room temp.) −(Preset temp.)
Preset
temp.
° C
Fig. 7-3-1Setting of air flow [FAN:AUTO]
2: The ECO operation can not be set
Fig. 7-3-3Setting of air flow [FAN:AUTO]
*2 : Fan speed = (M + −L) x 2/4 + L
NOTE 1 : *1 : Fan speed = (M + −L) x 3/4 + L
*3 : Fan speed = (M + −L) x 1/4 + L
*2 : Fan speed = (M + −L) x 2/4 + L
NOTE1 : *1 : Fan speed = (M + −L) x 3/4 + L
*3 : Fan speed = (M + −L) x 1/4 + L
(Linear approximation from M+ and L)
(Linear approximation from M+ and L)

FILE NO. SVM-10035
17 -
-
7-3-4. Heating operation
([MODE] button on the remote control is set
to the heating operation.)
(1) The compressor, 4-way valve, outdoor fan and
operation display lamp are controlled as shown in
Fig. 7-3-6.
Fig. 7-3-6
(2) When [FAN] button is set to AUTO, the indoor fan
motor operates as shown in Fig. 7-3-7.When
[FAN] button is set to LOW, LOW+, MED, MED+or
HIGH, the motor operates with a constant air flow.
7-3-3. Dry operation
([MODE] button on the remote control is set
to the dry operation.)
(1) The compressor, 4-way valve, outdoor fan and
operation display lamp are controlled as shown in
Fig. 7-3-4.
Fig. 7-3-4
(2) The microprocessor turns the compressor on and
off at the regular intervals (4 to 6 minutes).While
the compressor is turning off, the indoor fan motor
operates in the SUPER LOW position.
The pattern of operation depending on the relation
between room temperature and preset
temperatures is shown in Fig. 7-3-5.
Fig. 7-3-5
(3) [FAN] button on the remote control is set to AUTO
only.
(4) The ECO operations can not be set.
Preset
temp.
+3
+2
+1
0
OFF ON
OFF
4-way valve
Outdoor fan
OPERATION
Compressor
ON:6min. OFF:4min.
ON:5min. OFF:5min.
OFF
ON:6min. OFF:4min.
ON:5min. OFF:5min.
display lamp
(Room temp.) (Preset temp.)
Room temp.
Preset temp.+1
Preset temp.
Compressor
Outdoor fan
Indoor fan L. *S.L. S.L.L. L. S.L. L.
ON ON ON ON
OFF OFF OFF
*Super Low
ON
OFF
ON
OFF
ON ON
4-way valve
Outdoor fan
Compressor
Preset
temp.
OPERATION
display lamp
0
0.5
(Room temp.) (Preset temp.)
[FAN AUTO]
-0.5
-1
-1.5
-2 *1
*2
-5.0
-5.5
0
Preset
temp.
*3
M+
L
°C
(Room temp.) −(Preset temp.)
° C ° C
*2 : Fan speed = (M + −L) x 2/4 + L
*1 : Fan speed = (M + −L) x 1/4 + L
*3 : Fan speed = (M + −L) x 3/4 + L
(Calculated with Linear approximation from M+ and L)
Fig. 7-3-7

FILE NO. SVM-10035-1
18-
-
(3) 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. 7-3-8
7-3-5. Automatic operation
([MODE] button on the remote control is set
to the automatic operation.)
(1) One of 3 operations (Cooling, Fan only or Heating)
is selected according to difference between the
preset temperature and the room temperature at
which the automatic operation has started, as
shown in Fig. 7-3-9.The Fan only operation
continues until the room temperature reaches a
level at which another mode is selected.
(2) Temporary Auto
When the [RESET] button on the indoor unit
is pushed, the preset temperature is fixed at 24°C
and the indoor unit is controlled as shown in
Fig. 7-3-9.
Fig. 7-3-9
(Room temp.) −(Preset temp.)
°C
0
-1
Cooling operation
Fan only operation
*No limitation while fan speed MANUAL mode is in stabilit
y.
* A: Wh
e
n T
sc
≥
24
,
A is 24
,
and when Tsc < 24
,
A is Ts
c
Tsc: Set valu
e
NormalAUTO
Line-approximate
H and SL with Tc.
Stop
46
Tc
34
45 33
33 21
32 20
*A+0*A+0
*A-8*A-8
FanspeedMANUAL or AUTO instarting
FanspeedAUTOinstability
FanspeedAUTO FanspeedMANUAL
L-H(Upto
setting speed)
Line-approximate
H and SL with Tc.
SL (W2)
Stop
SL (W2)
Fig. 7-3-8Cold draft preventing control
FAN •Until 12 minutes
passed after operation
start
•When 12 to 25 minutes
passed after operation
start and room temp.
is 3°Cor lower than
set temp.
FAN •Room temp. < Set
Manual
•When 12 to 25 minutes
passed after opeartion
start and room temp.
is than (set )
between preset
temp. –3.5°C
(4)Inordertopreventcolddraftwhencompressor
during heating operation.Thenlouverwillmove
toupperpositionand fanspeedwillreduceor
OFF.
Heatingoperation
[In starting and in stability]
In starting In stability
3°C
•When 25 minutes or
more passed after
operation start
AUTO
temp.–4°C•Room temp. Set

FILE NO. SVM-10035
19 -
-
7-4-1.Low-Temperature Limit Control
The microcontroller detects the indoor heat exchanger
temperature to prevent the indoor heat exchanger from
freezing.
The compressor and outdoor fan motor are controlled
as shown in Fig. 7-4-1.
6
(°C)
2
Compressor Outdoor fan
ON
Less than 2°C continues
for 5 minutes
OFF
Heat exchanger
temperature
7-4. Drescription of Safety and Reliability Prevention Function
7-4-2 High-Temperature Limit Control
The microcontroller detects the indoor heat exchanger
temperature to prevent pressure of a refrigerating cycle
from increasing excessively.
The compressor and outdoor fan motor are controlled
as shown in Fig. 7-4-2.
Fig. 7-4-2
62
(°C)
55
54
Compressor Outdoor fan
OFF
OFF
ON
ON
OFF
ON
Heat exchanger
temp.
7-4-3.Defrost Operation *Heat pump model only
When the indoor unit is in heating operation, if the
refrigerant evaporation temperature detected by the
outdoor heat exchanger sensor is under the specified
temperature, the outdoor unit starts the defrosting
operation. At this time, the 4-way valve relay and the
outdoor fan motor are turned off. The indoor fan motor
is also turned off by the cold draft preventing control of
the indoor microcomputer. Then, [PRE. DEF.] lamp on
the indoor unit comes on.
The defrosting operation stops and the 4-way valve
relay, outdoor fan motor and the indoor fan motor are
turned on automatically when the refrigerant
evaporation increases to the specified temperature, or
when the defrosting time is over 12 minutes.
7-4-3-1. Defrost starting condition
Teo - Te ≤ −3°C at least 20 sec or ~ 60 min
A-Zone : If -10°C > Teo ≥ − 18°C, defrost will
after operation.
start when.
Teo - Te ≥ 2.5°C at teat 20 sec or
~ 30 min after operation.
B-Zone : If Te ≤ −18°C, defrost start instantaneously
(Suddenly) 00 ~ 25 min ofter operation
C-Zone : If -2ºC ≥ Teo ≥ −10°C defrost will start when
Td3 Td4
Finish time recordStart time record
Defrost time rate : (Td/Tt) x 100
Heating time rate : (Tt - Td) x Tt
7-4-3-2. Defrost finish condition.
1) If Te ≥ 3°C at least 60 sec -->4 way value on.
2) If Te ≥ 8°C --> 4 way value on.
Timing
Fig. 7-4-3
Operation time (4 Loops =Tt)
Td1 Td2
Fig. 7-4-1
(Heat pump model only)