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)