Mitsubishi SCM45ZA User manual

191191
6. INVERTER MULTI-SPLIT SYSTEM
ROOM AIR-CONDITIONER[2room]
(Air to air heat pump type)
(OUTDOOR UNIT)
SCM45ZA
(INDOOR UNIT)
SKM22ZA
SKM25ZA
SKM28ZA
SKM32ZA
SKM40ZA

192
CONTENTS
6.1 GENERAL INFORMATION ........................................................................193
6.1.1 Specific features ................................................................................. 193
6.1.2 How to read the model name .............................................................193
6.2 SELECTION DATA ..................................................................................... 194
6.2.1 Specifications......................................................................................194
6.2.2 Range of usage & limitations.............................................................198
6.2.3 Exterior dimensions............................................................................199
6.2.4 Piping system......................................................................................201
6.2.5 Selection chart .................................................................................... 202
6.3 ELECTRICAL DATA...................................................................................203
6.3.1 Electrical wiring ..................................................................................203
6.4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ............. 205
6.5 APPLICATION DATA .................................................................................215
6.5.1 Installation of indoor unit ...................................................................216
6.5.2 Installation of remote controller ........................................................218
6.5.3 Installation of outdoor unit.................................................................219
6.5.4 Electrical wiring ..................................................................................220
6.5.5 Refrigerant piping ............................................................................... 221
6.5.6 Test run and handling instruction .....................................................223
6.6 MAINTENANCE DATA ............................................................................... 224
6.6.1 Trouble shooting .................................................................................224
6.6.2 Servicing .............................................................................................. 232

193
6.1 GENERAL INFORMATION
6.1.1 Specific features
(1) Equipped with an inverter scroll compressor.
¡Low noise. Low vibration and compact.
(2) The long piping makes the location of the inside and units flexible.
¡No need for additional charge of refrigerant : 20 m
¡Maximum piping length : 30 m
(3) Connectable indoor capacity
Number of connectable units : 1 to 2 units
Total of indoor units (class kW) : 6.5 kW
(4) Indoor units are available with 5 capacities.
5 capacities ········ 22, 25, 28, 32, 40
(5) Inverter (Frequency converter) for multi-steps power control
¡Heating / Cooling
The rotational speed of a compressor is changed in step in relation to varying load, to interlock with the indoor and outdoor unit
fans controlled to changes in frequency, thus controlling the power.
¡Allowing quick heating/cooling operation during start-up period. Constant room temperature by fine-tuned control after the unit
has stabilized.
(6) Fuzzy control
Fuzzy control calculates the amount of variation in the difference between the suction air temperature and the setting temperature
in compliance with the fuzzy rules in order to control the air capacity and the inverter frequency.
(7) Self diagnosis function
We are constantly trying to do better service to our customers by installing such judges that show abnormality of operation as
follows. (See Page 225)
6.1.2 How to read the model name
Example : SK M 25 Z A
Series No.
Inverter and heat pump type.
Product capacity
Multiple system
Model name SK : Wall mounted type
SC : Outdoor unit

194
Item
Models SKM22ZA SKM25ZA SKM28ZA SKM32ZA SKM40ZA
Cooling capacity W 2200 2500 2800 3200 4000
Heating capacity W 3200 3400 4000 4500 5400
Noise level
Cooling
dB
Hi : 38 Lo : 29 Hi : 39 Lo : 31 Hi : 40 Lo : 30 Hi : 42 Lo : 31
Hi : 52 Lo : 43 Hi : 53 Lo : 45 Hi : 54 Lo : 44 Hi : 56 Lo : 45
Heating Hi : 39 Lo : 30 Hi : 40 Lo : 32 Hi : 41 Lo : 32 Hi : 42 Lo : 32
Hi : 53 Lo : 44 Hi : 54 Lo : 46 Hi : 55 Lo : 46 Hi : 56 Lo : 46
Exterior dimensions
Height ×Width ×Depth mm 250 ×750 ×178 275 ×790 ×174
Color Ivory white
Net weight kg 7.5 8.0
Air handling equipment
Fan type & Q’ty Tangential fan ×1
Motor W 17 18
Cooling 7.0 7.7 9.0 9.5
Air flow (at high) Heating CMM 7.5 9.1 10 10
Air filter, Q’ty Polypropylene net × 2 (Washable)
Operation switch Wireless-Remote controller
Room temperature control M.C thermostat
Pilot lamp RUN (Green), TIMER (Yellow)
Safety equipment
O.D mm (in) φ 6.35 (1/4″)
φ 9.52 (3/8″)φ 12.7 (1/2″)
Connecting method Flare connecting
Attached length of piping Liquid line : 0.4m Gas line : 0.35m
Insulation Necessary (Both Liquid & Gas lines)
Drain hose Connectable
Accessories (including) Mounting kit
Optional parts —
Outdoor units to be combined SCM45ZA
6.2 SELECTION DATA
6.2.1 Specifications
(1) Indoor unit
Models SKM22ZA, 25ZA, 28ZA, 32ZA, 40ZA
(2) Capacity indicated is the rated capacity with one unit operating under ISO-T1 standards conditions.
Refrigerant
piping
Liquid line
Gas line
Frost protection, Serial error protection
Fan motor error protection
Notes (1) The data are measured at the following conditions.
Item Indoor air temperature Outdoor air temperature Standards
Operation DB WB DB WB
Cooling 27ºC 19ºC 35ºC 24ºC ISO-T1, JIS C9612
Heating 20ºC – 7ºC 6ºC ISO-T1, JIS C9612
Sound level
Power level
Sound level
Power level

195
Item
Model SCM45ZA
Cooling capacity W 4500 (2000 ~ 5100)
Heating capacity W 5600 (2200 ~ 6000)
Power source 1 Phase 220/240V 50Hz
Power consumption Cooling W1820 (680 ~ 2050)
Heating 1950 (650 ~ 2190)
Running current Cooling 8.4/7.7
Heating A9.0/8.2
Sound level Cooling : 46 Heating : 48
Noise level
Power level
dB Cooling : 60 Heating : 62
Exterior dimensions
Height ×Width ×Depth mm 595 ×720 ×290
Color Stucco white
Net weight kg 36
Refrigerant equipment
Compressor type & Q’ty GR5490FD41 ×1
Motor kW 1.2
Starting method Direct start
Refrigerant control Capillary tubes +Electric expansion valve
Refrigerant kg R22 1.3 (Pre-charged up to the piping length of 20m)
Refrigerant oil R0.45 (BARREL FREEZE 32SAM)
Air handling equipment
Fan type & Q’ty Propeller fan ×2
Motor W 24
Air flow (at high) CMM 30
Shock & vibration absorber Rubber (for compressor)
Safety equipment
Size ×Core ×Number mm (in) Liquid line: φ6.35 (1/4″) ×2
Gas line: φ 9.52 (3/8″) ×2
Connecting method Flare connecting
Attached length piping —
Insulation Necessary (Both Liquid & Gas lines)
Power source supply Terminal block (Screw fixing type)
Size ×Core number 1.5 mm2×4 cores (Including earth cable)
Connecting method Terminal block (Screw fixing type)
Accessories (included) Union : (φ9.52 /φ12.7) ×1
Installation sheet, Manual instruction
Indoor units to be combined
(2) Outdoor unit
Model SCM45ZA
Compressor overheat protection, Overcurrent protection
High pressure protection, Serial signal error protection
Notes (1) The data are measured at the following conditions.
SKM22, 25, 28, 32, 40 type
Refrigerant
piping
Connec-
tion wiring
Item Indoor air temperature Outdoor air temperature Standards
Operation DB WB DB WB
Cooling 27ºC 19ºC 35ºC 24ºC ISO-T1, JIS C9612
Heating 20ºC – 7ºC 6ºC ISO-T1, JIS C9612
(2) The values for capacity and power consumption shown in a range ( ) indicate the minimum and maximum of the range.
(3) If the piping length exceeds 20 m, additional charging is required. (20g/m)

196
(3) Operation data
¡The combinations of the indoor units is indicated by numbers. They are read as follows.
(Example) SKM22ZA /22 SKM40ZA /40
¡The capacity of the indoor units is shown by rooms. If this exceeds the maximum capacity of the outdoor unit, the demand
capacity will be proportionally distributed.
¡If units are to be combined, use the table below to make the proper selection.
(a) Heating
Indoor unit
combination
Heating capacity (kW) Power consumption (W) Running
current (A)
Room heating capacity (kW) Total capacity (kW)
A room
3.2
3.4
4.0
4.5
5.4
2.8
2.6
2.5
2.3
2.0
2.8
2.6
2.5
2.2
2.8
3.0
3.1
3.3
3.6
2.8
3.0
3.1
3.4
B room Min.
Standard Max.
Min.
Standard StandardMax.
1.4
1.4
1.4
1.4
1.4
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
3.2
3.4
4.0
4.5
5.4
5.6
5.6
5.6
5.6
5.6
5.6
5.6
5.6
5.6
3.9
4.0
4.7
5.6
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
400
400
400
400
400
650
650
650
650
650
650
650
650
650
1030
1170
1350
1580
2030
1980
1950
1900
1850
1780
1950
1880
1830
1750
1330
1390
1680
2080
2300
2190
2160
2100
2050
1970
2160
2080
2030
1940
4.73/4.34
5.37/4.92
6.20/5.68
7.25/6.65
9.32/8.54
9.09/8.33
8.95/8.21
8.72/8.00
8.49/7.79
8.17/7.49
8.95/8.21
8.63/7.91
8.40/7.70
8.03/7.37
1
room
2
room
22
25
28
32
40
22+22
22+25
22+28
22+32
22+40
25+25
25+28
25+32
25+40
(220/240V)

197
(b) Cooling
Indoor unit
combination
Cooling capacity (kW) Power consumption (W) Running
current (A)
Room cooling capacity (kW) Total capacity (kW)
A room
2.2
2.5
2.8
3.2
4.0
2.2
2.1
2.0
1.9
1.7
2.25
2.2
2.1
1.8
2.2
2.4
2.6
2.8
3.1
2.25
2.4
2.6
3.0
B room Min.
Standard Max.
Min.
Standard StandardMax.
1.1
1.1
1.1
1.1
1.1
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.2
2.5
2.8
3.2
4.0
4.4
4.5
4.6
4.7
4.8
4.5
4.6
4.7
4.8
2.5
2.8
3.0
3.5
4.5
4.7
4.8
4.9
5.0
5.1
4.8
4.9
5.0
5.1
350
350
350
350
350
680
680
680
680
680
680
680
680
680
750
900
1040
1200
1580
1750
1820
1830
1840
1850
1820
1830
1840
1850
900
1040
1150
1360
1850
1950
2020
2030
2040
2050
2020
2030
2040
2050
3.44/3.16
4.13/3.79
4.78/4.38
5.51/5.05
7.25/6.65
8.03/7.37
8.36/7.66
8.40/7.70
8.45/7.74
8.49/7.79
8.36/7.66
8.40/7.70
8.45/7.74
8.49/7.79
1
room
2
room
22
25
28
32
40
22+22
22+25
22+28
22+32
22+40
25+25
25+28
25+32
25+40
(220/240V)

198
6.2.2 Range of usage & limitations
Indoor intake air temperature
(Upper, lower limits)
Indoor units
that can be
used in
combination
Length for one indoor unit
Total length for all rooms
Max. 25m
Max. 30m
6.5kW
1 to 2 units
SCM45ZA
Refer to the selection chart.
Compressor
stop/start
frequency
Power source
voltage
1 cycle time
Stop time
Voltage fluctuation
Voltage drop during start
Interval unbalance
Difference in height between indoor units (C)
Within ±3% of rated voltage
Within ±15% of rated voltage
Within ±10% of rated voltage
3 min or more
6 min or more (from stop to stop or from start to start)
Max. 25m
Max. 15m
Max. 10m
Outdoor air temperature
(Upper, lower limits)
Number of connected units
Total of indoor units (class kW)
Difference in
height between
indoor and outdoor
units
When above outdoor unit (B)
When below outdoor unit (A)
Item
Model
A
B
C

199
6.2.3 Exterior dimensions
(1) Indoor unit
Models SKM22ZA, 25ZA
A750
75
92 40
60
746.9
7.5 62 62 7.5
16
VIEW A
65615
150 450 150
Room temp.
thermistor
Terminal
block
Piping for Gas (Ø9.52) 370
Piping for Liquid (Ø6.35) 420
Piping hole
(Ø65)
Piping hole
(Ø65)
Piping hole right (left)
178 3
250
4615
19
9236.5
4.5
36
117
40
37
36
569
49
Unit: mm
Model SKM28ZA
A790
15
67
51
60
62 18
16
780
VIEW A
15760
170 450 170
Room temp. thermistor
Terminal block
Piping for Gas
(Ø9.52) 390
Piping for Liquid (Ø6.35) 440
Drain hose 600 (Ø16)
Piping hole
(Ø65)
Piping hole
(Ø65)
Piping hole right (left)
Unit: mm
174 3
275
187.5 61
46
9260
117
37
6
36
56
9
49

200
Models SKM32ZA, 40ZA
A790
15
67
51
60
62 18
16
780
VIEW A
15760
170 450 170
Room temp. thermistor
Terminal block
Piping for Gas
(Ø12.7) 390
Piping for Liquid (Ø6.35) 440
Drain hose 600 (Ø16)
Piping hole
(Ø65)
Piping hole
(Ø65)
Piping hole right (left)
Unit: mm
174 3
275
187.5 61
46
9260
117
37
6
36
56
9
49
(2) Outdoor unit
Model SCM45ZA
Ground
terminal
Liquid line service
valve B Unit
Liquid line service
valve A Unit
42.5 14 13.5
84.7
96.5 42.5
14.4
595
340
312.5
290
48.1 46.6
88.2
Elongated hole
(2-16×12)
19
12
Drain hole
720 62
50
87 510
411.5
256
123
29.7
Terminal block
Gas line service
valve B Unit
Gas line service
valve A Unit
35°
35°
(ø6.35)
(ø6.35)
(ø9.52)
(ø9.52)

201
6.2.4 Piping system
Model SCM45ZA
Outdoor unit
Indoor unit
Thermistor
(ThI-R)
Thermistor
(ThI-A)
Check joint
Thermistor
(ThO-D)
Thermistor
(ThO-A)
Thermistor
(ThO-R)
Heat exchanger
Heat exchanger
Liquid line
Gas line
(ø6.35)
(ø6.35)
(ø9.52)
(ø9.52)
Strainer Suction
Accumulator
Compressor
Discharge
Muffler
4 way valve
Service valve
(Liquid)
Capillary tube
Electric
expansion valve
EEVA
EEVB
Cooling cycle
Heating cycle
Service valve
(Gas)

202
6.2.5 Selection chart
Correct the cooling and heating capacity in accordance with the conditions as follows. The net cooling and heating capacity can be
obtained in the following way.
Net capacity = Capacity shown on specification ✕ Correction factors as follows.
(1) Coefficient of cooling and heating capacity in relation to temperatures
(2) Correction of cooling and heating capacity in relation to one way length of refrigerant piping
It is necessary to correct the cooling and heating capacity in relation to the one way piping length between the indoor and outdoor
units.
(3) Correction relative to frosting on outdoor heat exchanger during heating
In additions to the foregoing corrections (1), (2) the heating capacity needs to be adjusted also with respect to the frosting on the
outdoor heat exchanger.
15
ISO-T1 Standard ConditionOutdoor air W.B. temperature °C W.B.
010-10 -5 5
14 16 18 20 22
15
10
27
25
20
15
20
25
30
35
40
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
43
24
20
ISO-T1 Standard ConditionIndoor air W.B. temperature °C W.B.
Heating
Cooling
Applicable range
Coefficient of cooling & Heating capacity in relation to temperature
Cooling operation
Outdoor air D.B.
temperature
°C D.B.
Heating operation
Indoor air D.B.
temperature
°C D.B.
Air inlet temperature of
outdoor unit in ˚CWB
Adjustment coefficient
-10
0.95
-9
0.94
-7
0.93
-5
0.91
-3
0.88
-1
0.86
1
0.87
3
0.92
5
1.00
Piping length [m]
Cooling
Heating
7
1.0
1.0
10
0.99
1.0
15
0.975
1.0
20
0.965
1.0
25
0.95
1.0

203
RD
WH
BK
JR
F (250V ·3.15A)
Power line
(Outdoor unit)
Black
Blue
Gray
Yellow
Red
White
Purple
Yellow/Green
BK
BL
GR
Y
RD
WH
PP
Y/GN
Color symbol
S
ZNR
CFI
CNC CNB
TR
FMI
Q
CNM
CNE CND CNG
Display Wireless
R-Amp
Back up
switch
Printed circuit board
ThI-AThI-R
FMI
SM
COM
CNU
CF
BL
RD RD BK BK
CNW
GR
PP
Y
WH
RD
1
2
Y/GN
3
CM
FM
0
L
DS
EEVA, B
20S
Parts name
Compressor motor
Fan motor
Reactor
Diode stack
Electric expansion valve
4 way valve (coil)
Symbol
Tho-A
Tho-R
Tho-D
LED2
LED1, 3
Parts name
Thermistor (outdoor air temp.)
Thermistor (outdoor H.X temp.)
Thermistor (comp. dome temp.)
Warning lamp (Red)
Serial signal lamp (Green)
Symbol
•Indoor Unit
FM I
CF I
SM
TR
ZNR
Parts name
Fan motor
Capacitor (for FM
I )
Flap motor
Transformer
Varistor
Symbol
Q
F
Th
I -A
Th
I -R
Parts name
Fan motor control triac
Fuse
Thermistor (Room temp.)
Thermistor (Indoor H. X temp.)
Symbol
6.3 ELECTRICAL DATA
Meaning of marks
•Outdoor Unit
6.3.1 Electrical wiring
(1) Indoor unit
Models SKM22ZA, 25ZA, 28ZA, 32ZA, 40ZA

204
(2) Outdoor unit
Model SCM45ZA
~+
++++
–
~
1
2
3
1
2
3
1
2
Y/GN
Y/GN
WH
BK
BL
WH
BK
RD Serial A
Serial B
52X2-4 AC·R
AC·S
S. OUT
R. IN
S. IN
G
CNB CNB
LED1 LED3 LED2
(Red)
GY
DS
IC2
PRDU
WH
BK
Tho-A Tho-R
CND
CNC
CNACNFCNECNA
Tho-D
V
W
N
BL
ORWH
L
WH
BK
UNIT A
UNIT B
Power source
1 Phase
220/240V
50Hz
Printed circuit board
Fuse
250V 25A
Printed circuit board
Power
transistor
CM
20S EEVA FMoEEVB
(Green)
Black
Blue
Gray
Red
White
Orange
Yellow/Green
BK
BL
GY
RD
WH
OR
Y/GN
Color symbol

205
FAN SPEED ON/OFF MODE
TEMP AIR FLOW
SET TIMER TIMER
ACL
HI POWER
ECONO
CONT HI POWER ECONO
ON OFF TIMER
AUTO
HI
MED
LO
FAN SPEED indicator
Indicators the ¡for the fan speed which has
been set.
ON-TIMER •OFF-TIMER indicator
FAN SPEED button
Each time the button is pushed, the ¡
indicator is switched over in turn.
HI POWER button
This button changes the HI POWER
operation.
SET TEMPERATURE button
This button sets the room temperature.
ECONOMY button
This button changes the ECONOMY operation.
SET TIMER button
This button sets the ON TIMER time or SLEEP
time.
HI POWER operation indicator
Indicators during HI POWER operation.
ECONOMY operation indicator
Indicators during ECONOMY operation.
Operation switch over indicator
Indicators the ¡for the operation which has
been set.
AIR FLOW indicator
Indicator selected flap mode.
OPERATION MODE select button
Each time the button is pushed, the ¡
indicator is switched over in turn.
ON/OFF button
This button, when pressed, starts operation
and stops when repressed.
AIR FLOW button
This button changes the flap mode.
TIMER button
The button selects ON TIMER operation,
OFF-TIMER operation or normal operation.
Reset switch
Switch for resetting microcomputer.
RUN
TIMER
INVERTER
TIMER RUN
RUN (HOT KEEP) lamp (green)
•Illuminates during operation.
•Flashs at stop blowing due to the hot keep.
Illuminates during TIMER operation.
TIMER lamp (yellow)
INVERTER
¡Above figure shows all indications for the purpose of explanation,
but practically only the pertinent parts are indicated.
Heat pump model : [ (AUTO) ·(Cool) ·(Heat) ·(Dry)]
Cooling only model: [ (AUTO) ·(Cool) ·(Fan) ·(Dry)]
6.4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
(1) Remote Controller
(2) Indoor unit indicator
Models SKM22, 25 models Models SKM28, 32, 40 models

206
(3) Back-up switch
When the remote controller become weak, or if the remote controller is lost or malfunctioning, this switch may be used to turn the
unit on and off.
(a) Operation
Push the switch once to place the unit in the automatic mode. Push it once more to turn the unit off.
(b) Detail of operation
Operation starts in the same way as the previous operation.
¡The flap operation as shown above will be repeated.
Stops at the level position for
one minute.
sIn case of cooling t
and dry operation sIn case of heating t operation
Sway operation
Sway operation
(4) Flap control
Control the flap by AIRFLOW button on the wireless remote control.
(a) Natural flow (AUTO)
The flap will be automatically set to the angle of air flow best to operation.
1) Starting time of operation
ON/OFF
¡The flap operation as shown above will be repeated.
Models SKM22, 25 models Models SKM28, 32, 40 models
ON/OFF button
(c) Swing flap
Flap moves in upward and downward directions continuously.
Horizontal
blowing
2) When not operating
The flap returns to the position of air flow directly below, when operation has stopped.
(b) Memory flap (Only case of SKM28, 32, 40 models)
While the flap is operating if the AIRFLOW button is pushed once, it stops swinging at an angle.
As this angle is memorized in the microcomputer, the flap will be automatically set to the angle when next operation is
started.
◆Recommendable stopping angle of the flap
Slant forward
blowing
COOL•DRY
HEAT
ON/OFF button

207
(5) Comfort timer setting
If the timer is set at ON when the operation select switch is set at the cooling or heating, or the cooling or heating in auto mode
operation is selected, the comfort timer starts and determines the starting time of next operation based on the initial value of 15
minutes and the relationship between the room temperature at the setting time (temperature of room temperature thermistor) and
the setting temperature. (Max. 60 minutes)
Operation mode Operation start time correction value (Min.)
3 < Room temp. –Setting temp. 1 < Room temp. –Setting temp. 3 Room temp. –Setting temp. 1
At cooling +5 No change –5
3 < Setting temp. –Room temp. 2 < Setting temp. –Room temp. 3 Setting temp. –Room temp. 2
At heating +5 No change –5
Notes (1) At 5 minutes before the timer ON time, operation starts regardless of the temperature of the room temperature thermistor (ThI-A).
(2) This function does not actuate when the operation select switch is set at the dehumidifying as well as the dehumidifying in the auto mode.
However, the operation of item (1) above is performed during the dehumidifying in the auto mode.
(3) During the pleasant reservation operation, both the operation lamp and timer lamp illuminate and the timer lamp goes off after expiration of the timer, ON setting
time.
Corrects the starting time of next operation by
calculating the temperature difference.
(Example) Heating
Setting temperature
Room temperature
Operation starting time
Time Setting time 15 min. 10 min. 5 min.
earlier earlier earlier
¡If the difference (= Setting temperature –Room
temperature) is 4ºC, the correction value is found to be
+5 minutes from the table shown above so that the
starting time of next operation is determined as
follows:
15 min. earlier + 5 min. = 20 min. earlier
↑↑
Current operation Correction value
start time
≤
≤
≤ ≤
Capacity control is within the range shown above. If demand capacity of the indoor units exceeds the maximum capac-
ity of the outdoor unit, the demand capacity will be proportionally distributed.
2) Outdoor unit speed control (28 ~ 120 rps)
(6) Cooling operation
(a) Summary
1) Capacity control
Model
Capacity
SCM45ZA
2.0 ~ 5.1 kW
SCM45YA
2.0 ~ 5.1 kW
28 rps or less
More than 28 rps, but 120 rps or less
More than 120 rps
Decision speed
28 rps
28 to 120 rps
120 rps
Indoor unit instruction total speed value
Note (1) The indoor unit instruction total speed value is the total of the values from each unit in item (b).
(b) Mode switching
Within the selected mode, the unit operates using the values shown below which were obtained by multiplying a conversion
coefficient to the indoor unit instruction speed.
Model (Indoor)
Operation Mode
Automatic
High
Medium
Low
Hi power
Econo
28 ~ 58
28 ~ 58
28 ~ 44
28 ~ 30
58
28 ~ 34
28 ~ 68
28 ~ 68
28 ~ 50
28 ~ 32
68
28 ~ 36
28 ~ 88
28 ~ 88
28 ~ 60
28 ~ 30
86
28 ~ 50
28 ~ 96
28 ~ 96
28 ~ 70
28 ~ 34
96
28 ~ 40
28 ~ 110
28 ~ 118
28 ~ 100
28 ~ 40
108
28 ~ 50
22 25 28 32 40
(rps)

208
(7) Heating Operation
(a) Summary
1) Capacity control
Model
Capacity
SCM45ZA
2.2 ~ 6.0 kW
28 rps or less
More than 28 rps, but 120 rps or less
More than 120 rps, but 134 rps or less
More than 134 rps
Decision speed
28 rps
28 to 120 rps
120 to 134 rps
134 rps
Indoor unit instruction total speed value
Capacity control is within the range shown above. If demand capacity of the indoor units exceeds the maximum capac-
ity of the outdoor unit, the demand capacity will be proportionally distributed.
2) Outdoor unit speed control (28 ~ 134 rps)
Note (1) The indoor unit instruction total speed value is the total of the values from each unit in item (b).
(c) Operation of Major Functional Components in Cooling Mode
Functional
components
Operation
Instruction speed
Indoor
unit fan
Compressor
Outdoor unit fan
Electronic
expansion valve
See preceding table
ON
According to instruction speed
According to outdoor unit speed
According to decision
speed
0
(All indoor units)
OFF
According to stop mode
According to mode switching
OFF
0
(Thermostat off units)
ON
All closed
(Thermostat off units)
According to outdoor unit speed
According to mode switching
All closed
(Fan, stop, abnormal stop units)
0
(Fan, stop, abnormal stop units)
0
(All units)
ON
First speed or low
OFF
OFF
According to stop mode
Cooling Thermostat OFF
(All indoor units) Thermostat OFF
(Some of indoor units)
Fan, stop, abnormal stop
(Some of indoor units)
Failure
(Outdoor Unit)
Fixed
Automatic
(b) Mode switching
Within the selected mode, the unit operates using the values shown below which were obtained by multiplying a conversion
coefficient to the indoor unit instruction speed.
(c) Operation of Major Functional Components in Heating Mode
Model (Indoor)
Operation Mode
Automatic
High
Medium
Low
Hi power
Econo
28 ~ 74
28 ~ 74
28 ~ 50
28 ~ 34
76
28 ~ 42
28 ~ 80
28 ~ 80
28 ~ 58
28 ~ 36
82
28 ~ 44
28 ~ 120
28 ~ 120
28 ~ 86
28 ~ 46
120
28 ~ 60
28 ~ 126
28 ~ 126
28 ~ 92
28 ~ 46
120
28 ~ 54
28 ~ 134
28 ~ 134
28 ~ 126
28 ~ 54
126
28 ~ 64
22 25 28 32 40
(rps)
Functional
components
Operation
Instruction speed
Indoor
unit fan
Compressor
Outdoor unit fan
Electronic
expansion valve
See preceding table
ON
According to mode switching
According to instruction speed
According to outdoor unit speed
According to decision
speed
0
(All indoor units)
OFF
According to stop mode
Hot Keep
Hot Keep
OFF
0
(Thermostat off units)
ON
After 4 minutes all closed: 58 pulse
(Thermostat off units)
According to mode switching
According to instruction speed
According to outdoor unit speed
58 Pulse
(Fan, stop, abnormal stop units)
0
(Fan, stop, abnormal stop units)
0
(All units)
ON OFF
Hot Keep
Hot Keep
OFF
According to stop mode
Heating Thermostat OFF
(All indoor units) Thermostat OFF
(Some of indoor units)
Fan, stop, abnormal stop
(Some of indoor units)
Failure
(Outdoor Unit)
Fixed
Automatic

209
(d) Hot keep operation
If the hot keep operation is selected during the heating operation, the indoor fan is controlled based on the temperature of the
indoor unit heat exchanger (detected with ThI-R, indoor unit heat exchanger thermistor) to prevent blowing of cool wind.
¡Normal mode (Normal heating operation, operation after HI POWER completion)
1st speed
¡Values of a, b
AB
At 0 rps command 22 25
Other than 0 rps 17 19
command
Note (1) Refer to the table shown above right for the values A and B.
¡Hot keep M mode [During HI POWER operation (for 15 min.)]
Indoor fan
Indoor heat exchanger temp. (˚C)
2nd speed
3rd speed
4th speed
5th speed
6th speed
7th speed
1st speed
Indoor heat exchanger temp. (˚C)
2nd speed
3rd speed
4th speed
5th speed
6th speed
7th speed
(e) Defrosting
(i) When the following conditions are met, the defrosting operation will start.
1) During normal operation
a) When 40 minutes has passed since the start of heating or 40 minutes after the last defrosting (based on cumu-
lative operation time of compressor).
b) When the outdoor heat exchanger thermistor (Tho-R) temperature is –2 °C or less for 3 continuous minutes
after 37 minutes have passed.
c) Outdoor temperature thermistor (Tho-A) –outdoor heat exchanger thermistor (Tho-R) temperature 0.44 ×
outdoor temperature thermistor (Tho-A) temperature + A °C or more.
A = Outdoor temperature –2 °C: 4, outdoor temperature < –2 °C: 6.
d)When the compressor is operating.
uOr, during heating, defrosting will start when the decision speed counts zero (0) rps for 10 times or more
and all conditions in a), b) and d) have been satisfied.
2) During defrosting acceleration
a) When 40 minutes has passed since the last defrosting (based on cumulative operation time of compressor).
b) When the compressor is operating.
uOr, during heating, defrosting will start when the decision speed counts zero (0) rps for 10 times or more
and all conditions in a) and b) have been satisfied.
Note (1) Defrosting acceleration is when the finishing of the previous defrosting is according to the defrosting conditions of the 10 minutes
that have passed.
Indoor fan

210
3) Operation of function component in defrosting
4) Conditions for finishing defrosting
When any of the following conditions is met, the defrosting finishing operation will start.
1When the temperature of the outdoor heat exchanger thermistor (Tho-R) is 9 °C or more.
2When 10 minutes has passed after the start of defrosting.
(8) Determining the operating mode
The cooling and heating operating modes are the remote control switch mode that have been previously determined.
If a mode differing from these is selected after this, the selected mode will appear in the display of the remote control, but only the
fan will operate.
A unit
B unit
Cooling
Cooling
Fan Heating
HeatingFan
Cooling
switch
ON
Heating
switch
ON
Heating
switch
ON
Cooling
switch
ON
Heating
switch
ON
O
p
eration O
p
eration O
p
eration O
p
eration O
p
eration
Example of operating pattern
Note (1) [ ] indicates currect operation.
1
2
Example
First operation Second operation Notes
Different mode is
only fan operation.
•
Selected Mode
Cooling
Heating
Remote Control Display
Cooling
Heating
Operation
Cooling
Heating
Selected Mode
Heating
Cooling
Remote Control Display
Heating
Cooling
Operation
Fan (1)
Fan
Note (1) If the display shows
heating and the opera-
tion is fan, Hot Keep
will operate.
Notes (1) Indoor unit fan is
in response to Hot
Keep.
(2) Outdoor unit fan
starts
6 seconds af-
ter the start of the
compressor.
80 sec.80 sec.
ON
OFF
OFF
0 rps
According to rps
EEV control Calculated start
Opening in relation
to conditions
Opening in
relation to
conditions
Defrost end conditions
Start of defrost operation Defrost operation
Fully closed
Defrost end operation
80 rps
Decision speed Decision speedOutdoor unit speed
Outdoor unit fan
Electronic expansion valve
EEVA,B
(Operating unit)
Electronic expansion valve
EEVA,B
(Stopped unit)
4-way valve
200 pulse
When 2 units are operating:
150 pulse
When 1 unit is operating:
200 pulse