Mitsubishi Electric MXZ-3A30NA Service manual

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Page 1
Revision B:
• MXZ-2A20NA - 1 and MXZ-3A30NA - 1
have been added.
Please void OB444 REVISED EDITION-A.
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
OUTDOOR UNIT
SERVICE MANUAL
HFC
utilized
No. OB444
REVISED EDITION-B
R410A
Inverter-controlled multi system type
Models
MXZ-2A20NA
MXZ-2A20NA MXZ-3A30NA
MXZ-3A30NA -
1
1
Indoor unit service manual
MSZ-A·NA Series (OB450)
CONTENTS
MXZ-2A20NA
MXZ-2A20NA NOTE:
• This service manual describes technical
data of the outdoor units.
• RoHS compliant products have <G> mark
on the spec name plate.
For servicing of RoHS compliant products,
refer to the RoHS Parts List.
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················6
3. INDOOR UNITS COMBINATION ·······················7
4. SPECIFICATION···············································10
5. OUTLINES AND DIMENSIONS ·······················12
6. WIRING DIAGRAM ··········································15
7. REFRIGERANT SYSTEM DIAGRAM ··············19
8. DATA·································································23
9. ACTUATOR CONTROL····································38
10. SERVICE FUNCTIONS·····································38
11. TROUBLESHOOTING ······································40
12. DISASSEMBLY INSTRUCTIONS·····················57
13. PARTS LIST······················································66
14. RoHS PARTS LIST···········································74
15. OPTIONAL PARTS···········································86
1
The Slim Line.
From Mitsubishi Electric.
TM
9700058
33223
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Page 2
Revision A:
• RoHS PARTS LIST has been added.
Revision B:
• MXZ-2A20NA -
1
1
and MXZ-3A30NA -
have been added.
1
TECHNICAL CHANGES
MXZ-2A20NA
New model
MXZ-30TN2 ➔ MXZ-3A30NA
1. Combinations of connectable indoor units have been increased.
2. Capacity class of connectable indoor units have been made larger.
3. Compressor has been changed. (THV247FBA ➔ TNB220FMCH)
4. Outdoor fan motor has been changed. (RA6N60-AA ➔ RC0J60-AB)
5. Refrigerant has been changed. (R22 ➔ R410A)
6. Refrigerant system diagram has been changed.
• 1 of 2 high pressure switch has been removed.
• Accumulator has been removed.
• Receiver has been added.
7. Communication system has been changed.
8. Power supply way has been changed(change to supply to outdoor unit).
9. Evaporation temperature thermistor has been added.
10. Ambient temperature thermistor has been added.
MXZ-2A20NA ➔ MXZ-2A20NA 1.
2.
3.
4.
5.
1
Compressor has been changed. (SNB130FPDH1 ➔ SNB130FQBH1)
Gas pipe temperature thermistor has been removed.
Pre-heat control has been added.
Electronic control P.C. board has been changed.
Power board has been changed.
MXZ-3A30NA ➔ MXZ-3A30NA -
1
1. Ball valve has been changed to stop valve.
2. Gas pipe temperature thermistor has been removed.
3. Pre-heat control has been added.
4. Auto line correcting function has been added.
5. Noise filter P.C. board has been changed.
6. Electronic control P.C. board has been changed.
7. Weight has been changed. (158lb. ➔ 148lb.)
2
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Page 3
INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT
oil
Refrigeration
Refrigerant
• This room air conditioner adopts HFC refrigerant (R410A) which never destroys the ozone layer.
• Pay particular attention to the following points, though the basic installation procedure is same as that for R22 air
conditioners.
1 As R410A has working pressure approximate 1.6 times as high as that of R22, some special tools and piping parts/
materials are required. Refer to the table below.
2 Take sufficient care not to allow water and other contaminations to enter the R410A refrigerant during storage and
installation, since it is more susceptible to contaminations than R22.
3 For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R410A. (Refer to 2. Refrigerant
piping.)
4 Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent
composition change.
Refrigerant
Composition (Ratio)
Refrigerant handling
Chlorine
Safety group (ASHRAE)
Molecular weight
Boiling point (-F)
Steam pressure [77-F](PSIG)
Saturated steam density [77-F](lb/ft3)
Combustibility
ODP w1
GWP w2
Refrigerant charge method
Additional charge on leakage
Kind
Color
Smell
w1 :Ozone Depletion Potential
w2 :Global Warming Potential
New refrigerant
R410A
HFC-32: HFC-125 (50%:50%)
Pseudo-azeotropic refrigerant
Not included
A1/A1
72.6
-60.5
225.82
3.995
Non combustible
0
1730
From liquid phase in cylinder
Possible
Incompatible oil
Non
Non
: based on CFC-11
: based on CO2
3
Previous refrigerant
R22
R22 (100%)
Single refrigerant
Included
A1
86.5
-41.4
136.34
2.772
Non combustible
0.055
1700
Gas phase
Possible
Compatible oil
Light yellow
Non
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Page 4
Compressor
New Specification
Current Specification
The incompatible refrigeration oil easily separates from
Since refrigerant and refrigeration oil are compatible,
refrigerant and is in the upper layer inside the suction muffler. refrigeration oil goes back to the compressor through the
Raising position of the oil back hole enables to back the
lower position oil back hole.
refrigeration oil of the upper layer to flow back to the
compressor.
Suction muffler
Suction muffler
Oil back hole
Compressor
Compressor
refrigeration oil
Oil back hole
Refrigerant
refrigeration oil /Refrigerant
Conversion chart of refrigerant temperature and pressure
(PSIG)
580
Saturated liquid pressure
508
R410A
435
R22
363
290
218
145
73
0
-73
-22
-4
14
32
50
68
86
104 122 140 (-F)
1.Tools dedicated for the air conditioner with R410A refrigerant
The following tools are required for R410A refrigerant. Some R22 tools can be substituted for R410A tools.
R410A tools
Description
Can R22 tools be used?
Gauge manifold
No
R410A has high pressures beyond the measurement range of existing
gauges.
Charge hose
No
Hose material have been changed to improve the pressure resistance.
No
Dedicated for HFC refrigerant.
Yes
1/4in. and 3/8in.
Gas leak detector
Torque wrench
No
1/2in. and 5/8in.
Flare tool
Yes
Clamp bar hole has been enlarged to reinforce the spring strength in the tool.
Flare gauge
Vacuum pump
adapter
Electronic scale for
refrigerant charging
New
Provided for flaring work (to be used with R22 flare tool).
Provided to prevent the back flow of oil. This adapter enables you to use
vacuum pumps.
It is difficult to measure R410A with a charging cylinder because the
refrigerant bubbles due to high pressure and high-speed vaporization.
New
New
No : Not Substitutable for R410A
Yes : Substitutable for R410A
4
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2.Refrigerant piping
1 Specifications
Use the copper or copper-alloy seamless pipes for refrigerant that meet the following specifications.
1/4
Wall thickness
(inch)
0.0315
3/8
0.0315
Heat resisting foam plastic
1/2
0.0315
Specific gravity 0.045 Thickness 0.315 inch
5/8
0.0394
Outside diameter
(inch)
Insulation material
2 Flaring work and flare nut
Flaring work for R410A pipe differs from that for R22 pipe.
For details of flaring work, refer to Installation manual “FLARING WORK”.
Dimension of flare nut
(inch) [inch]
Pipe diameter
(inch)
R410A
R22
1/4
17 [11/16]
17 [11/16]
3/8
22 [7/8]
22 [7/8]
1/2
26 [1-1/32]
24 [15/16]
5/8
29 [1-5/32]
27 [1-1/16]
3.Refrigeration oil
Apply the special refrigeration oil (accessories: packed with indoor unit) to the flare and the union seat surfaces.
4.Air purge
• Do not discharge the refrigerant into the atmosphere.
Take care not to discharge refrigerant into the atmosphere during installation, reinstallation, or repairs to the refrigerant
circuit.
• Use the vacuum pump for air purging for the purpose of environmental protection.
5.Additional charge
For additional charging, charge the refrigerant from liquid phase of the gas cylinder.
If the refrigerant is charged from the gas phase, composition change may occur in the refrigerant inside the cylinder and the
outdoor unit. In this case, ability of the refrigeration cycle decreases or normal operation can be impossible. However,
charging the liquid refrigerant all at once may cause the compressor to be locked. Thus, charge the refrigerant slowly.
Union
Stop valve
Indoor unit
Liquid pipe
Gas pipe
Refrigerant gas
cylinder
operating valve
Outdoor unit
Service port
Gauge manifold
valve (for R410A)
Charge hose (for R410A)
Refrigerant gas cylinder
for R410A with siphon
Refrigerant (liquid)
Electronic scale for refrigerant charging
5
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Page 6
PART NAMES AND FUNCTIONS
MXZ-2A20NA
MXZ-2A20NA -
1
Air inlet
(Back and side)
Air outlet
Drain outlet
MXZ-3A30NA
Air inlet
(Back and side)
Air outlet
Drain outlet
MXZ-3A30NA -
1
Air inlet
(Back and side)
Air outlet
Drain outlet
6
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Page 7
INDOOR UNITS COMBINATION
3
MXZ-2A20NA
MXZ-2A20NA -
1
Cooling capacity (BTU/h)
Indoor units
combination
Unit A
Unit B
09
9,000
–
12
12,000
–
15
15,000
–
09+09
9,000
9,000
09+12
8,500
11,500
09+15
7,500
12,500
12+12
10,000
10,000
Total
Power consumption
(W)
9,000
(5,400 ~ 9,000)
12,000
(5,400 ~ 12,000)
15,000
(5,400 ~ 15,000)
18,000
(7,800 ~ 18,000)
20,000
(7,800 ~ 20,000)
20,000
(7,800 ~ 20,000)
20,000
(7,800 ~ 20,000)
730
(490 ~ 730)
990
( 490 ~ 990)
1,540
(490 ~ 1,540)
1,740
(630 ~ 1,740)
2,150
(630 ~ 2,150)
2,150
(630 ~ 2,150)
2,150
(630 ~ 2,150)
Heating capacity (BTU/h)
Indoor units
combination
Unit A
Unit B
09
10,900
–
12
13,600
–
15
18,000
–
09+09
10,900
10,900
09+12
9,500
12,500
09+15
8,250
13,750
12+12
11,000
11,000
Total
Power consumption
(W)
10,900
(5,200 ~ 15,400)
13,600
(5,200 ~ 16,400)
18,000
(5,200 ~ 21,100)
21,800
(8,500 ~ 21,800)
22,000
(8,500 ~ 22,000)
22,000
(8,500 ~ 22,000)
22,000
(8,500 ~ 22,000)
940
(480 ~ 1,430)
1,180
(480 ~1,460)
1,720
(480 ~ 2,100)
1,820
(520 ~ 1,820)
1,780
(520 ~ 1,780)
1,780
(520 ~ 1,780)
1,780
(520 ~ 1,780)
7
Current
(A)
208V 230V
Power
factor
(%)
3.69
3.34
95
5.01
4.53
95
7.79
7.05
95
8.62
7.80
97
10.66
9.64
97
10.66
9.64
97
10.66
9.64
97
Current
(A)
208V 230V
Power
factor
(%)
4.76
4.30
95
5.97
5.40
95
8.70
7.87
95
9.02
8.16
97
8.82
7.98
97
8.82
7.98
97
8.82
7.98
97
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Page 8
MXZ-3A30NA MXZ-3A30NA -
1
Cooling capacity (BTU/h)
Indoor units
combination
Unit A
Unit B
Unit C
09
9,000
–
–
12
12,000
–
–
15
15,000
–
–
17
16,200
–
–
24
22,000
–
–
09+09
9,000
9,000
–
09+12
9,000
12,000
–
09+15
9,000
15,000
–
09+17
9,000
16,200
–
09+24
7,600
20,400
–
12+12
12,000
12,000
–
12+15
11,500
14,500
–
12+17
10,800
15,200
–
15+15
13,000
13,000
–
15+17
12,200
13,800
–
17+17
13,000
13,000
–
09+09+09
9,000
9,000
9,000
09+09+12
8,500
8,500
11,400
09+09+15
7,750
7,750
12,900
09+09+17
7,300
7,300
13,800
Total
Power consumption
(W)
9,000
(7,200 ~ 9,000)
12,000
(7,200 ~ 12,000)
15,000
(7,200 ~ 15,000)
16,200
(7,200 ~ 16,200)
22,000
(7,200 ~ 22,000)
18,000
(12,000 ~ 18,000)
21,000
(12,000 ~ 21,000)
24,000
(12,000 ~ 24,000)
25,200
(12,000 ~ 25,200)
28,000
(12,000 ~ 28,000)
24,000
(12,000 ~ 24,000)
26,000
(12,000 ~ 26,000)
26,000
(12,000 ~ 26,000)
26,000
(12,000 ~ 26,000)
26,000
(12,000 ~ 26,000)
26,000
(12,000 ~ 26,000)
27,000
(12,600 ~ 27,000)
28,400
(12,600 ~ 28,400)
28,400
(12,600 ~ 28,400)
28,400
(12,600 ~ 28,400)
800
(650 ~ 800)
1,000
(650 ~ 1,000)
1,320
(650 ~ 1,320)
1,480
(650 ~ 1,480)
2,220
(650 ~ 2,200)
1,800
(920 ~ 1,800)
2,000
(920 ~ 2,000)
2,500
(920 ~ 2,500)
2,700
(920 ~ 2,700)
3,200
(920 ~ 3,200)
2,500
(920 ~ 2,500)
2,800
(920 ~ 2,800)
2,800
(920 ~ 2,800)
2,800
(920 ~ 2,800)
2,800
(920 ~ 2,800)
2,800
(920 ~ 2,800)
2,860
(1,000 ~ 2,850)
3,250
(1,000 ~ 3,250)
3,250
(1,000 ~ 3,250)
3,250
(1,000 ~ 3,250)
8
Current
(A)
208V 230V
Power
factor
(%)
4.05
3.66
95
5.06
4.58
95
6.68
6.04
95
7.49
6.77
95
11.13
10.07
95
8.92
8.07
97
9.91
8.96
97
12.39
11.21
97
13.38 12.10
97
15.86 14.34
97
11.21
97
13.88 12.55
97
13.88 12.55
97
13.88 12.55
97
13.88 12.55
97
13.88 12.55
97
14.18 12.82
97
16.11
14.57
97
16.11
14.57
97
16.11
14.57
97
12.39
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Page 9
Heating capacity (BTU/h)
Indoor units
combination
Unit A
Unit B
Unit C
09
10,900
–
–
12
13,600
–
–
15
18,000
–
–
17
20,100
–
–
24
23,200
–
–
09+09
10,900
10,900
–
09+12
10,900
13,600
–
09+15
10,100
16,900
–
09+17
9,300
17,700
–
09+24
7,300
19,700
–
12+12
13,500
13,500
–
12+15
12,000
15,000
–
12+17
11,200
15,800
–
15+15
13,500
13,500
–
15+17
12,700
14,300
–
17+17
13,500
13,500
–
09+09+09
9,500
9,500
9,500
09+09+12
8,600
8,600
11,400
09+09+15
7,800
7,800
13,000
09+09+17
7,350
7,350
13,900
Total
Power consumption
(W)
10,900
(8,600 ~ 15,400)
13,600
(8,600 ~ 16,400)
18,000
(8,600 ~ 21,100)
20,100
(8,600 ~ 21,500)
23,200
(8,600 ~ 27,800)
21,800
(11,000 ~ 31,000)
24,500
(11,000 ~ 33,000)
27,000
(11,000 ~ 35,000)
27,000
(11,000 ~ 35,000)
27,000
(11,000 ~ 35,000)
27,000
(11,000 ~ 35,000)
27,000
(11,000 ~ 35,000)
27,000
(11,000 ~ 35,000)
27,000
(11,000 ~ 35,000)
27,000
(11,000 ~ 35,000)
27,000
(11,000 ~ 35,000)
28,500
(11,400 ~ 36,000)
28,600
(11,400 ~ 36,000)
28,600
(11,400 ~ 36,000)
28,600
(11,400 ~ 36,000)
1,100
(780 ~1,520)
1,380
(780 ~ 1,600)
1,940
(780 ~ 2,280)
2,240
(780 ~ 2,300)
2,520
(780 ~ 3,000)
1,700
(740 ~2,560)
1,980
(740 ~ 2,800)
2,200
(740 ~ 2,920)
2,200
(740 ~ 2,920)
1,980
(740 ~ 2,740)
2,200
(740 ~ 2,920)
2,160
(740 ~ 2,860)
2,140
(740 ~ 2,860)
2,120
(740 ~ 2,800)
2,110
(740 ~ 2,800)
2,100
(740 ~ 2,800)
2,180
(740 ~ 2,880)
2,180
(740 ~ 2,880)
2,180
(740 ~ 2,880)
2,180
(740 ~ 2,880)
9
Current
(A)
208V 230V
Power
factor
(%)
5.57
5.03
95
6.98
6.32
95
9.82
8.88
95
11.34
10.25
95
12.75
11.53
95
8.43
7.62
97
9.81
8.87
97
10.90
9.86
97
10.90
9.86
97
9.81
8.87
97
10.90
9.86
97
10.71
9.68
97
10.61
9.59
97
10.51
9.50
97
10.46
9.46
97
10.41
9.41
97
10.80
9.77
97
10.80
9.77
97
10.80
9.77
97
10.80
9.77
97
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Page 10
SPECIFICATION
Item
Capacity
Power
consumption
Cooling ❈1
Heating 47
Heating 17
Cooling ❈1
Heating 47
Heating 17
Cooling
Heating
Heating
❈1
❈2
❈1
❈2
EER ❈1 [SEER] ❈3
HSPF IV (V)
COP
External finish
Power supply
Max. fuse size (time delay)
Min. circuit ampacity
Fan motor
Model
Btu/h
Btu/h
Btu/h
W
W
W
V, phase, Hz
A
A
F.L.A
Model
Compressor
Winding resistance (at 68˚F) "
R.L.A
L.R.A
Refrigerant control
Sound level
Defrost method
Dimensions
dB(A)
in.
in.
in.
lb.
W
D
H
Weight
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping
Liquid
Valve size
Gas
Indoor
Connection method
Outdoor
Refrigerant charge (R410A)
in.
in.
lb.
oz.
Refrigeration oil (Model)
MXZ-2A20NA MXZ-2A20NA 20,000/ (7,800 ~ 20,000)
22,000/ (8,500 ~ 22,000)
14,500
2,150/ (630 ~ 2,150)
1,780/ (520 ~ 1,780)
1,500 (1,500)
9.3 [15]
9.0 (7.0)
12.4
Munsell 5Y 8/1
208/230, 1, 60
20
15
0.96
MXZ-2A20NA
SNB130FPDH1
MXZ-2A20NA - 1
SNB130FQBH1
MXZ-2A20NA
U-V 0.45 V-W 0.45 W-U 0.45
MXZ-2A20NA - 1 U-V 0.98 V-W 0.98 W-U 0.98
10.1
15
LEV
49/51
Reverse cycle
33-1/16
13
27-15/16
130
Wireless type
12-24V DC
Not supplied (optional parts)
1/4
A,B:3/8
Flared
Flared
5lb. 15oz.
20.3 (NEO22)
MXZ-2A20NA
23.7 (NEO22)
MXZ-2A20NA - 1
1
NOTE : Test conditions are based on ARI 210/240.
❈1 : Rating conditions (cooling) — Indoor : 80˚FDB, 67˚FWB, Outdoor : 95˚FDB, (75˚FWB)
(heating) — Indoor : 70˚FDB, 60˚FWB, Outdoor : 47˚FDB, 43˚FWB
❈2 :
(heating) — Indoor : 70˚FDB, 60˚FWB, Outdoor : 17˚FDB, 15˚FWB
❈3 :
(cooling) — Indoor : 80˚FDB, 67˚FWB, Outdoor : 82˚FDB, 65˚FWB
Unit: ˚F
Mode
Indoor air condition Outdoor air condition
Dry bulb Wet bulb Dry bulb Wet bulb
Test
Cooling
❈1: "A" Cooling Steady State at rated compressor Speed
❈3: "B-2" Cooling Steady State at rated compressor Speed
"B-1" Cooling Steady State at minimum compressor Speed
Low ambient Cooling Steady State at minimum compressor Speed
Intermediate Cooling Steady State At Intermediate compressor Speedw
Heating
❈1: Standard Rating-Heating at rated compressor Speed
❈2: Low temperature Heating at rated compressor Speed
Max. temperature Heating at minimum compressor Speed
High temperature Heating at minimum compressor Speed
Frost Accumulation at rated compressor Speed
Frost Accumulation at Intermediate compressor Speedw
80
80
80
80
80
70
70
70
70
70
70
67
67
67
67
67
60
60
60
60
60
60
wAt Intermediate compressor Speed
=("Cooling rated compressor speed" - "minimum compressor speed") / 3 + "minimum compressor speed".
10
95
82
82
67
87
47
17
62
47
35
35
(75)
(65)
(65)
(53.5)
(69)
43
15
56.5
43
33
33
OB444B--1.qxp
07.4.17 4:27 PM
Page 11
Item
❈1
Capacity
Power
consumption
❈1
❈3
Cooling
Heating 47
Heating 17
Cooling ❈1
Heating 47
Heating 17
Cooling
Heating
Heating
❈1
❈2
❈1
❈2
Model
Btu/h
Btu/h
Btu/h
W
W
W
EER
[SEER]
HSPF IV (V)
COP
External finish
Power supply
V, phase, Hz
Max. fuse size (time delay)
A
Min. circuit ampacity
A
Fan motor
F.L.A
Model
Winding resistance (at 68˚F) "
Compressor
R.L.A
L.R.A
Refrigerant control
Sound level
dB(A)
Defrost method
W
in.
D
Dimensions
in.
H
in.
Weight
lb.
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping
Liquid
Valve size
Gas
Indoor
Connection method
Outdoor
Refrigerant charge (R410A)
Refrigeration oil (Model)
MXZ-3A30NA
MXZ-3A30NA -
in.
in.
lb.
oz.
1
MXZ-3A30NA MXZ-3A30NA - 1
28,400/ (12,600 ~ 28,400)
28,600/ (11,400 ~ 36,000)
18,800
3,250/ (1,000 ~ 3,250)
2,180/ (740 ~ 2,880)
2,120
8.7 [16.0]
10.0 (7.5)
13.1
Munsell 3.0Y 7.8/1.1
208/230, 1, 60
20
15
0.93
TNB220FMCH
U-V 0.61 V-W 0.61 W-U 0.61
11
15
LEV
49/49
Reverse cycle
35-7/16
12-19/32
35-7/16
158
148
Wireless type
12-24V DC
Not supplied (optional parts)
1/4
A:1/2 B,C:3/8
Flared
Flared
7lb. 11oz.
29.4 (NEO22)
NOTE : Test conditions are based on ARI 210/240.
❈1 : Rating conditions (cooling) — Indoor : 80˚FDB, 67˚FWB, Outdoor : 95˚FDB, (75˚FWB)
(heating) — Indoor : 70˚FDB, 60˚FWB, Outdoor : 47˚FDB, 43˚FWB
❈2 :
(heating) — Indoor : 70˚FDB, 60˚FWB, Outdoor : 17˚FDB, 15˚FWB
❈3 :
(cooling) — Indoor : 80˚FDB, 67˚FWB, Outdoor : 82˚FDB, 65˚FWB
Unit: ˚F
Mode
Indoor air condition Outdoor air condition
Dry bulb Wet bulb Dry bulb Wet bulb
Test
80
67
95
❈1: "A" Cooling Steady State at rated compressor Speed
80
67
82
❈3: "B-2" Cooling Steady State at rated compressor Speed
80
67
82
"B-1" Cooling Steady State at minimum compressor Speed
80
67
67
Low ambient Cooling Steady State at minimum compressor Speed
80
67
87
Intermediate Cooling Steady State At Intermediate compressor Speedw
70
60
47
Heating ❈1: Standard Rating-Heating at rated compressor Speed
70
60
17
❈2: Low temperature Heating at rated compressor Speed
70
60
62
Max. temperature Heating at minimum compressor Speed
70
60
47
High temperature Heating at minimum compressor Speed
70
60
35
Frost Accumulation at rated compressor Speed
70
60
35
Frost Accumulation at Intermediate compressor Speedw
wAt Intermediate compressor Speed
=("Cooling rated compressor speed" - "minimum compressor speed") / 3 + "minimum compressor speed".
Cooling
11
(75)
(65)
(65)
(53.5)
(69)
43
15
56.5
43
33
33
OB444B--1.qxp
07.4.17 4:27 PM
Page 12
OUTLINES AND DIMENSIONS
5
MXZ-2A20NA
MXZ-2A20NA -
Unit: inch
1
REQUIRED SPACE
6-9/16"
19-11/16"
Open as a rule
More than 19.69 in.
if the front and both sides are
open
6-21/32"
9-3/16"
11-11/32"
Drain hole 3-[1-5/16"
Indoor and outdoor
connect wiring
1-3/16"
3-[7/8" hole
11/16"
5-5/16"
More than 13.78 in.
1/2"
Gas pipe
[3/8"flared (both A&B unit)
B unit connection
A unit connection
1"
1-3/16"
12-3/4"
13"
27-15/16"
1-3/16"
1-25/32"
29/32"
8-5/8"
1-3/16"
15/16"
11-3/4"
Open as a rule
More than 19.69 in.
if the back, both sides
and top are open
4-13/32"✕13/16" Oval hole
(Base bolt M10)
33-1/16"
More than 3.94 in.
More than 7.87 in.
if there are obstacles to both
sides
More than 3.94 in.
15-19/32"
1-1/2"
14-3/16"
1-7/32"
21/32"
Air out
14-3/16"
Air in
Air in
11/16"
1-7/32"
2-1/2"
2-5/8"
Liquid pipe
[1/4"flared (both A&B unit)
Grounding terminal
Conduit
cover
Lock nut
12
Connector
OB444B--1.qxp
07.4.17 4:27 PM
Page 13
MXZ-3A30NA
Unit: inch
REQUIRED SPACE
Open as a rule
More than 19.69 in.
if the front and both sides are
open
15-1/4"
1-3/16" 12-19/32"
2-15/32"✕1-13/32" Oval hole
(Base bolt M10)
Indoor and outdoor
connect wiring
4-[7/8" hole
2-11/16"
C unit connection
1-5/16"
35-7/16"
15"
18-1/8"
1-31/32"
9-27/32"
35-7/16"
12-1/2"
13/32"
29/32"
B unit connection
Gas pipe
[3/8" flared (B,C unit)
[1/2" flared (A unit)
29-9/16"
Drain hole 3-[1-5/16"
More than 13.78 in.
Open as a rule
More than 19.69 in.
if the back, both sides
and top are open
1-1/4"
Air out
1-9/16"
2-29/32"
Air in
13-31/32" (5/8")
Air in
(5/8")
1-3/8"
2-U-shape notched holes
(Base bolt M10)
More than 3.94 in.
More than 7.87 in.
if there are
obstacles to both
sides
More than 3.94 in.
10-5/8"
3-25/32"
1-3/8" 9-27/32"
(7-7/8")
A unit connection
3-15/32"
Liquid pipe
[1/4" flared
29/32"
19-11/16"
(1-1/16")
7-7/8"
Lock nut
Conduit cover
Connector
13
Note : Leave front, overhead and
both sides clearance fully.
12-1/2"
Note : Leave front and both sides
clearance fully.
29/32"
Note : Leave front and overhead
clearance fully.
More than 3-15/16"
More than13-25/32"
14
12-19/32"
C
B
A
2.Service space
More than 13-25/32"
More than 3-15/16"
1.Installation space
1-3/16"
More than 19-11/16"
35-7/16"
35-7/16"
4-3/4"
1-3/16"
Handle
19-1/8"
8-27/32"
;;;
;
;;;
;
14"
(Bolt pitch)
15-1/4"
15/16" 7/16"
Drain hole 3-[1-5/16"
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Air in
5-3/16"
Air out
5/8"
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;;
Air in
1-25/32"
1-3/8"
More than 7-7/8"
5/8"
19-11/16"
More than 19-11/16"
9-27/32"
1-1/16"
7-7/8"
1-9/16"
MXZ-3A30NA -
1-3/8"
07.4.17 4:27 PM
More than 19-11/16"
18-1/8"
2-29/32"
OB444B--1.qxp
Page 14
1
Unit: inch
7-7/8"
10-5/8"
2-U Shaped notched hole
(Base bolt M10)
2-(15/32"o1-13/32") Oval hole
(Base bolt M10)
3-[7/8"Punched hole
(Connect wiring hole)
2-[7/8"Knockout
(Connect wiring hole)
13/32"
Handle
3-15/32"
Gas pipe
[3/8 (B,C unit)
[1/2 (A unit)
C unit connection
B unit connection
A unit connection
Liquid pipe
[1/4 flared
More than 3-15/16"
Lock nut
Connector
Conduit cover
More than 3-15/16"
SERVICE SPACE
More than 13-25/32"
OB444B--1.qxp
6
07.4.17 4:27 PM
Page 15
WIRING DIAGRAM
MXZ-2A20NA
15
OB444B--1.qxp
07.4.17 4:28 PM
MXZ-2A20NA -
Page 16
1
16
OB444B--1.qxp
07.4.17 4:28 PM
Page 17
MXZ-3A30NA
17
OB444B--1.qxp
07.4.17 4:28 PM
MXZ-3A30NA -
Page 18
1
18
OB444B--1.qxp
07.4.17 4:28 PM
Page 19
REFRIGERANT SYSTEM DIAGRAM
7
MXZ-2A20NA
MXZ-2A20NA -
Unit:mm
1
Service
port
Compressor
R.V. coil
OFF
ON
Indoor unit
B
Unit B gas pipe
temperature thermistor W
Oil separator
Ball valve with
service port
Unit A gas pipe
temperature thermistor W
Discharge
temperature
thermistor RT62
Capillary tube
O.D.0.98✕I.D.0.02✕39.37
4-way valve
Muffler
Outdoor heat
exchanger
temperature
thermistor
RT68
FAN-OUT
HEX-OUT
Indoor unit
A
Refrigerant flow in cooling
Refrigerant flow in heating
Service
port
Ambient
temperature
thermistor
RT65
Defrost
thermistor
RT61
Capillary tube
O.D.0.16✕I.D.0.11✕ 3.93
Indoor unit
A
Strainer
#100
Capillary tube
O.D.0.14✕I.D.0.09✕19.68
LEV A
Ball valve
Strainer
#100
LEV E
Power
receiver
Capillary tube
O.D.0.16✕I.D.0.11✕ 3.93
Indoor unit
B
Strainer
#100
W Except MXZ-2A20NA -
LEV B
1
.
19
Strainer
#100
Distributor
OB444B--1.qxp
07.4.17 4:28 PM
Operating Range
MXZ-2A20NA
Maximum
Minimum
Maximum
Minimum
Cooling
Heating
Page 20
MXZ-2A20NA -
1
Indoor intake air temperature Outdoor intake air temperature
115˚FDB
95˚FDB, 71˚FWB
14˚FDB
67˚FDB, 57˚FWB
75˚FDB, 65˚FWB
80˚FDB, 67˚FWB
14˚FDB, 12˚FWB
70˚FDB, 60˚FWB
MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION
MXZ-2A20NA
MXZ-2A20NA -
1
Piping length each indoor unit (a, b)
82ft. MAX.
Total piping length (a+b)
164ft. MAX.
Bending point for each unit
25 MAX.
Total bending point
60 MAX.
❋It does not matter which unit is higher.
Indoor
units
a
Outdoor
unit
49ft.
49ft.
33ft.
b
● Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes,refer to the
tables below.
● When diameter of refrigerant pipe is different from that of outdoor unit union, use optional Different-diameter pipe.
For further information on Different-diameter pipe, see 15-1.
Unit : inch
Indoor unit
class
09
12
15
Pipe diameter
Liquid
1/4
Extension pipe diameter
Liquid
1/4
Gas
3/8
Gas
3/8
Liquid
1/4
Liquid
1/4
Gas
3/8
Gas
3/8
Liquid
1/4
Liquid
1/4
Gas
3/8
Gas
3/8
Outdoor unit union diameter
For
Indoor unit A
Indoor unit B
20
Liquid
1/4
Gas
3/8
Liquid
1/4
Gas
3/8
OB444B--1.qxp
07.4.17 4:28 PM
Page 21
Unit:mm
MXZ-3A30NA
R.V. coil
OFF
ON
Service
port
Service Compressor
port
Refrigerant flow in cooling
Refrigerant flow in heating
High-pressure
switch
Discharge
temperature
thermistor RT62
Oil separator
Indoor unit
C
Indoor unit
B
Indoor unit
A
Unit C gas pipe
temperature thermistor
Ball valve with
service port
Capillary tube
O.D.0.10✕I.D.0.02✕39.37
4-way valve
Unit B gas pipe
temperature thermistor
Muffler
Unit A gas pipe
temperature thermistor
Outdoor
heat
exchanger
Ambient
temperature
thermistor
Outdoor heat RT65
exchanger
temperature
thermistor
RT68
Capillary tube
O.D.0.16✕I.D.0.11✕ 3.54
Indoor unit
A
Indoor unit
B
Indoor unit
C
Strainer
#100
LEV A
Strainer
#100
LEV B
Strainer
#100
LEV C
Defrost
thermistor
RT61
Ball valve Strainer
#100
LEV E
Strainer
#100
Capillary tube
O.D.0.16✕I.D.0.09✕15.75
Distributor
Power
receiver
Distributor
MXZ-3A30NA -
Unit:mm
1
Service port
R.V. coil
OFF
ON
Compressor
Service
port
Discharge
temperature
Refrigerant flow in cooling High-pressure
thermistor RT62
switch
Refrigerant flow in heating
Oil separator
Stop valve
(with service port)
Indoor unit
C
Indoor unit
B
Indoor unit
A
Capillary tube
O.D.0.10✕I.D.0.02✕39.37
4-way valve
Muffler
Outdoor
heat
exchanger
Outdoor heat
exchanger
temperature
thermistor
RT68
Capillary tube
O.D.0.16✕I.D.0.11✕3.94
Indoor unit
A
Indoor unit
B
Indoor unit
C
Strainer
#100
LEV A
Strainer
#100
LEV B
Strainer
#100
LEV C
Ambient
temperature
thermistor
RT65
Defrost
thermistor
RT61
Stop valve Strainer
#100
LEV F
Power
receiver
21
Strainer
#100
Capillary tube
O.D.0.12✕I.D.0.08✕11.8
Distributor
OB444B--1.qxp
07.4.17 4:28 PM
Operating Range
MXZ-3A30NA MXZ-3A30NA -
Maximum
Minimum
Maximum
Minimum
Cooling
Heating
Page 22
1
Indoor intake air temperature Outdoor intake air temperature
115˚FDB
95˚FDB, 71˚FWB
14˚FDB
67˚FDB, 57˚FWB
75˚FDB, 65˚FWB
80˚FDB, 67˚FWB
14˚FDB, 12˚FWB
70˚FDB, 60˚FWB
MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION
MXZ-3A30NA MXZ-3A30NA -
1
Piping length each indoor unit (a, b, c)
82ft. MAX.
Total piping length (a+b+c)
230ft. MAX.
Bending point for each unit
25 MAX.
Total bending point
70 MAX.
❋It does not matter which unit is higher.
Indoor
units
a
Outdoor
unit
b
33ft.
(MXZ-3A30NA)
49ft.
(MXZ-3A30NA -
1
) 33ft.
(MXZ-3A30NA)
49ft.
(MXZ-3A30NA -
1
)
33ft.
c
● Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes,refer to the
tables below.
● When diameter of refrigerant pipe is different from that of outdoor unit union, use optional Different-diameter pipe.
For further information on Different-diameter pipe, see 15-1.
Unit : inch
Indoor unit
class
09
12
15
17
24
Pipe diameter
Liquid
1/4
Extension pipe diameter
Liquid
1/4
Gas
3/8
Gas
3/8
Liquid
1/4
Liquid
1/4
Gas
3/8
Gas
3/8
Liquid
1/4
Liquid
1/4
Gas
3/8
Gas
3/8
Liquid
1/4
Liquid
1/4
Gas
1/2
Gas
1/2
Liquid
1/4
Liquid
1/4
Gas
5/8
Gas
5/8
Outdoor unit union diameter
For
Indoor unit A
Indoor unit B
Indoor unit C
22
Liquid
1/4
Gas
1/2
Liquid
1/4
Gas
3/8
Liquid
1/4
Gas
3/8
OB444B--1.qxp
07.4.17 4:28 PM
8
Page 23
DATA
MXZ-2A20NA MXZ-2A20NA -
Model
Item
Capacity
Total
Unit
Cooling
Heating
Btu / h
20,000
22,000
SHF
—
–
–
Input
kW
2.15
1.78
MXZ-2A20NA MXZ-2A20NA -
Outdoor unit
Electrical
circuit
1
1
208/230, 1, 60
Power supply (V, phase, Hz)
kW
2.113
1.743
Comp. current (208/230V)
A
10.08/9.11
8.24/7.45
Fan motor current (208/230V)
A
0.43/0.39
0.43/0.39
Condensing pressure
PSIG
435
363
Suction pressure
PSIG
128
101
Discharge temperature
˚F
190
169
Condensing temperature
˚F
122
106
˚F
65
40
Comp. shell bottom temp.
Ref. pipe length
[Total pipe length for multi-system]
˚F
146
144
ft.
25 [50]
Refrigerant charge (R410A)
—
5lb.15oz.
Input
Refrigerant
circuit
Suction temperature
DB
˚F
95
47
WB
˚F
—
43
Fan speed
rpm
650
700
Airflow
CFM
1,485
1,640
Intake air temperature
Outdoor
unit
23
OB444B--1.qxp
07.4.17 4:28 PM
Page 24
Model
MXZ-3A30NA MXZ-3A30NA -
Item
Capacity
Total
SHF
Input
Unit
Cooling
Heating
Btu / h
28,400
28,600
—
–
–
kW
3.25
2.18
MXZ-3A30NA MXZ-3A30NA -
Outdoor unit
Electrical
circuit
1
1
208/230, 1, 60
Power supply (V, phase, Hz)
kW
3.197
2.127
Comp. current (208/230V)
A
15.45/13.97
10.15/9.18
Fan motor current (208/230V)
A
0.43/0.39
0.43/0.39
Condensing pressure
PSIG
506
330
Suction pressure
PSIG
136
96
˚F
190
150
˚F
132
100
˚F
48
30
Comp. shell bottom temp.
Ref. pipe length
[Total pipe length for multi-system]
˚F
146
125
ft.
25 [75]
Refrigerant charge (R410A)
—
7lb.11oz.
Input
Discharge temperature
Refrigerant Condensing temperature
circuit
Suction temperature
DB
˚F
95
47
WB
˚F
—
43
Fan speed
rpm
520
600
Airflow
CFM
1,365
1,605
Intake air temperature
Outdoor
unit
24
OB444B--1.qxp
07.4.17 4:28 PM
Page 25
8-1. OPERATING RANGE
(1) POWER SUPPLY
Rating
Model
MXZ-2A20NA
MXZ-2A20NA MXZ-3A30NA
MXZ-3A30NA -
Outdoor unit
1
Guaranteed Voltage
Min. 198V 208V 230V Max. 253V
208/230V 60Hz 1[
1
(2) OPERATION
MXZ-2A20NA
Function
Cooling
Heating
MXZ-2A20NA -
1
Intake air
temperature
Condition
"A" Cooling Steady State
at rated compressor Speed
"B-2" Cooling Steady State
at rated compressor Speed
"B-1" Cooling Steady State
at minimum compressor Speed
Low ambient Cooling Steady State
at minimum compressor Speed
Intermediate Cooling Steady State
At Intermediate compressor Speedw
Standard Rating-Heating
at rated compressor Speed
Low temperature Heating
at rated compressor Speed
Max. temperature Heating
at minimum compressor Speed
High temperature Heating
at minimum compressor Speed
Frost Accumulation
at rated compressor Speed
Frost Accumulation
at Intermediate compressor Speedw
Outdoor
Indoor
DB (˚F)
WB (˚F)
DB (˚F)
WB (˚F)
80
67
95
(75)
80
67
82
(65)
80
67
82
(65)
80
67
67
(53.5)
80
67
87
(69)
70
60
47
43
70
60
17
15
70
60
62
56.5
70
60
47
43
70
60
35
33
70
60
35
33
wAt Intermediate compressor Speed
=("Cooling rated compressor speed" - "minimum compressor speed") / 3 + "minimum compressor speed".
25
OB444B--1.qxp
07.4.17 4:28 PM
MXZ-3A30NA MXZ-3A30NA -
Function
Page 26
1
Intake air
temperature
Condition
Indoor
DB (˚F)
Outdoor
WB (˚F)
DB (˚F)
"A" Cooling Steady State
80
67
95
at rated compressor Speed
"B-2" Cooling Steady State
80
67
82
at rated compressor Speed
"B-1"
Cooling
Steady
State
80
67
Cooling at minimum compressor Speed
82
Low ambient Cooling Steady State
80
67
67
at minimum compressor Speed
Intermediate Cooling Steady State
80
67
87
At Intermediate compressor Speedw
Standard Rating-Heating
70
60
47
at rated compressor Speed
Low temperature Heating
70
60
17
at rated compressor Speed
Max. temperature Heating
70
60
62
Heating at minimum compressor Speed
High temperature Heating
70
60
47
at minimum compressor Speed
Frost Accumulation
70
60
35
at rated compressor Speed
Frost Accumulation
70
60
35
at Intermediate compressor Speedw
wAt Intermediate compressor Speed
=("Cooling rated compressor speed" - "minimum compressor speed") / 3 + "minimum compressor speed".
MXZ-2A20NA MXZ-2A20NA -
1
MXZ-3A30NA MXZ-3A30NA -
WB (˚F)
(75)
(65)
(65)
(53.5)
(69)
43
15
56.5
43
33
33
1
The standard specifications apply only to the operation of the air conditioner under normal conditions.
Since operating conditions vary according to the areas where these units are installed, the following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
(1) GUARANTEED VOLTAGE
198 ~ 253V 60Hz
(2) AIR FLOW
Air flow should be set at MAX.
(3) MAIN READINGS
}
(1) Indoor intake air wet-bulb temperature :
°FWB
(2) Indoor outlet air wet-bulb temperature :
°FWB
Cooling
(3) Outdoor intake air dry-bulb temperature :
°FDB
(4) Total input:
W
(5) Indoor intake air dry-bulb temperature :
°FDB
Heating
(6) Outdoor intake air wet-bulb temperature :
°FWB
(7) Total input :
W
Indoor air wet/dry-bulb temperature difference on the left side of the following chart shows the difference between the
indoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service.
}
How to measure the indoor air wet-bulb/dry-bulb temperature difference
1.
2.
3.
4.
5.
6.
7.
8.
Attach at least 2 sets of wet-and dry-bulb thermometers to the indoor air intake as shown in the figure, and at least 2 sets
of wet-and dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air
speed is high.
Attach at least 2 sets of wet-and dry-bulb thermometers to the outdoor air intake.
Cover the thermometers to prevent direct rays of the sun.
Check that the air filter is cleaned.
Open windows and doors of room.
Press the EMERGENCY OPERATION switch once(twice) to start the EMERGENCY COOL(HEAT) MODE.
Compressor starts running at 33Hz (COOL) or 45Hz (HEAT). The frequency at each operation mode is fixed.
When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.
10 minutes later, measure temperature again and check that the temperature does not change.
INDOOR UNIT
OUTDOOR UNIT
Wet-and dry-bulb
thermometers
26
Wet-and dry-bulb
thermometers
OB444B--1.qxp
07.4.17 4:28 PM
Page 27
8-2. CAPACITY AND THE INPUT CURVES
7.8
9.3 11.1
7.2
8.5 10.2
6.6
7.8
9.2
5.9
7.0
8.3
5.3
6.3
7.5
4.8
5.6
6.6
09 class
(36Hz)
12 class
(50Hz)
15 class
(77Hz)
24.0
79
79
24.1 29.5
20.3
22.1 27.0
18.5
20.0 24.6
16.6
18.0 22.1
16.0 19.7
12.9
14.0 17.2
11.1
12.0 14.7
15 class
(75Hz)
14.8
12 class
(56Hz)
22.2
72
68
64
72
68
64
80
85
Ind
o
14
90
95
100
105
110
80
in
or
tak
23
ea
r
ir D
y-b
ulb
pe
tem
rat
ur
85
90
95
100
105
110
59
68
79
-F)
e(
ture
pera
take
r in
doo
m
lb te
9.3 11.1
12.2 10.9
7.2
8.5 10.2
11.2 10.0
6.6
7.8
9.2
10.1 9.1
5.9
7.0
8.3
9.1 8.2
u
ry-b
air D
32
41
50
59
14
23
32
41
50
5.3
6.3
7.5
8.2 7.3
4.8
5.6
6.6
7.2 6.5
24 class
(56Hz)
17 class
(40Hz)
15 class
(36Hz)
12 class
(27Hz)
09 class
(20Hz)
24.0
26.1 31.9
35.7
27.6
22.2
24.1 29.5
32.9
25.5
20.3
22.1 27.0
30.2
23.4
27.4
21.2
16.6
18.0 22.1
24.7
19.1
14.8
16.0 19.7
21.9
17.0
12.9
14.0 17.2
19.2
14.9
11.1
12.0 14.7
16.5
12.7
12 class
(42Hz)
17 class
(60Hz)
24 class
(72Hz)
15 class
(56Hz)
59
Outdoor intake air Wet-bulb temperature (-F)
1
79
79
20.0 24.6
79
68
59
NOTE:The above broken lines are for the heating operation without any frost and defrost operation.
7.8
18.5
(-F)
In
Outdoor intake air Wet-bulb temperature (-F)
09 class
(34Hz)
Indoor air WB temperature
difference (degree)
Indoor unit class
(Inverter output
frequency)
Indoor air DB temperature
difference (degree)
75
75
MXZ-3A30NA MXZ-3A30NA -
Indoor unit class
(Inverter output
frequency)
1
26.1 31.9
09 class
(45Hz)
Indoor unit class
(Inverter output
frequency)
Indoor air DB temperature
difference (degree)
Indoor unit class
(Inverter output
frequency)
Indoor air WB temperature
difference (degree)
MXZ-2A20NA MXZ-2A20NA -
75
72
68
64
75
72
68
64
80
85
90
95
100
105
o
Ind
14
or
23
int
ak
ir
ea
Dr
32
y-b
ulb
-F
e(
)
ur
rat
pe
tem
110
80
85
90
95
50
110
take
59
14
23
te
-bulb
F)
re (-
ratu
mpe
or in
41
105
59
68
79
Indo
Outdoor intake air Wet-bulb temperature (-F)
100
y
ir Dr
a
32
41
50
79
68
59
59
Outdoor intake air Wet-bulb temperature (-F)
NOTE:The above broken lines are for the heating operation without any frost and defrost operation.
27
OB444B--1.qxp
07.4.17 4:28 PM
Page 28
8-3. Capacity and input correction by means of inverter output frequency
(OUTDOOR UNIT : MXZ-2A20NA MXZ-2A20NA -
1
)
1. 09-class unit in single operation
<COOL>Total input
<COOL>Capacity
<HEAT>Capacity
<HEAT>Total input
2.0
2.0
2.0
2.0
1.5
1.5
1.5
1.5
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0
50
0
100 Hz
50
100 Hz
0
Frequency
Frequency
50
100 Hz
0
50
100 Hz
Frequency
Frequency
2. 12-class unit in single operation
<COOL>Total input
<COOL>Capacity
<HEAT>Total input
<HEAT>Capacity
2.0
2.0
2.0
2.0
1.5
1.5
1.5
1.5
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0
50
100 Hz
0
50
100 Hz
0
Frequency
Frequency
50
0
100 Hz
50
100 Hz
Frequency
Frequency
3. 15-class unit in single operation
<COOL>Total input
<COOL>Capacity
<HEAT>Capacity
<HEAT>Total input
2.0
2.0
2.0
2.0
1.5
1.5
1.5
1.5
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0
50
Frequency
100 Hz
0
50
100 Hz
Frequency
0
50
Frequency
28
100 Hz
0
50
Frequency
100 Hz
OB444B--1.qxp
07.4.17 4:28 PM
Page 29
(OUTDOOR UNIT:MXZ-3A30NA MXZ-3A30NA -
1
)
1. 09-class unit in single operation
<COOL>Total input
<COOL>Capacity
<HEAT>Capacity
<HEAT>Total input
2.0
2.0
2.0
2.0
1.5
1.5
1.5
1.5
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0
50
0
100 Hz
50
100 Hz
0
50
Frequency
Frequency
100 Hz
0
50
100 Hz
Frequency
Frequency
2. 12-class unit in single operation
<COOL>Total input
<COOL>Capacity
<HEAT>Total input
<HEAT>Capacity
2.0
2.0
2.0
2.0
1.5
1.5
1.5
1.5
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0
50
100 Hz
0
50
100 Hz
0
50
Frequency
Frequency
0
100 Hz
50
100 Hz
Frequency
Frequency
3. 15-class unit in single operation
<COOL>Total input
<COOL>Capacity
<HEAT>Capacity
<HEAT>Total input
2.0
2.0
2.0
2.0
1.5
1.5
1.5
1.5
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0
50
0
100 Hz
50
100 Hz
0
50
Frequency
Frequency
100 Hz
0
50
100 Hz
Frequency
Frequency
4. 17-class unit in single operation
<COOL>Total input
<COOL>Capacity
<HEAT>Capacity
<HEAT>Total input
2.0
2.0
2.0
2.0
1.5
1.5
1.5
1.5
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0
50
0
100 Hz
50
100 Hz
0
50
Frequency
Frequency
100 Hz
0
50
100 Hz
Frequency
Frequency
5. 24-class unit in single operation
<COOL>Total input
<COOL>Capacity
<HEAT>Capacity
<HEAT>Total input
2.0
2.0
2.0
2.0
1.5
1.5
1.5
1.5
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0
50
Frequency
100 Hz
0
50
100 Hz
0
50
Frequency
Frequency
29
100 Hz
0
50
Frequency
100 Hz
OB444B--1.qxp
07.4.17 4:28 PM
Page 30
8-4. Outdoor low pressure and outdoor unit current
1. 09-class unit in single operation (OUTDOOR UNIT : MXZ-2A20NA MXZ-2A20NA - 1 )
(1) COOL operation
1Data is based on the condition of indoor
humidity 50%
<How to work fixed-frequency operation>
2Air flow speed : High
1.Set emergency switch to COOL or HEAT.The switch is locat3Inverter output frequency : 33Hz
ed on indoor unit.
2.Press emergency run ON/OFF button.
3.Compressor starts running at 33Hz (COOL) or 45Hz (HEAT).
4.Indoor fan runs at High speed and continues for 30 minutes.
5.To cancel this operation,press emergency run ON/OFF button
or any button on remote controller.
(PSIG)
170
re(°F)
mperatu
DB te
Indoor
86
80
150
140
75
130
Outdoor unit current (A)
Outdoor low pressure
160
6.0
70
5.0
(°F)
ture
4.0
era
emp
Bt
or D
Indo
3.0
86
80
75
70
33Hz
2.0
1.0
33Hz
120
65 70 75 80 85 90 95 100 105 110 115(°F)
0.0
65 70 75 80 85 90 95 100 105 110 115(°F)
Ambient temperature(°F)
Ambient temperature(°F)
(2) HEAT operation
1Data is based on the condition of indoor
humidity 75%
2Set air flow to High speed.
3Inverter output frequency is 45Hz.
Outdoor unit current (A)
7.0
6.0
5.0
)
e(°F
ratur
4.0
Indo
or D
pe
B tem
75
70
65
3.0
45Hz
2.0
15 20 25 30 35 40 45 50 55 60 65 70 75 (°F)
Ambient temperature(°F)
30
OB444B--2.qxp
07.4.17 4:32 PM
Page 31
2. 12-class unit in single operation (OUTDOOR UNIT : MXZ-2A20NA MXZ-2A20NA - 1 )
(1) COOL operation
1Data is based on the condition of indoor
humidity 50%
<How to work fixed-frequency operation>
2Air flow speed : High
1.Set emergency switch to COOL or HEAT.The switch is locat3Inverter output frequency : 33Hz
ed on indoor unit.
2.Press emergency run ON/OFF button.
3.Compressor starts running at 33Hz (COOL) or 45Hz (HEAT).
4.Indoor fan runs at High speed and continues for 30 minutes.
5.To cancel this operation,press emergency run ON/OFF button
or any button on remote controller.
160
r DB
Indoo
6.0
F)
ture(°
era
temp
86
5.0
80
150
75
140
Outdoor unit current (A)
Outdoor low pressure
(PSIG)
170
ure(
4.0
rat
mpe
°F)
86
80
75
70
B te
or D
Indo
3.0
33Hz
2.0
70
130
1.0
33Hz
120
0.0
65 70 75 80 85 90 95 100 105 110 115(°F)
65 70 75 80 85 90 95 100 105 110 115 (°F)
Ambient temperature(°F)
Ambient temperature(°F)
(2) HEAT operation
1Data is based on the condition of outdoor
humidity 75%.
2Set air flow to High speed.
3Inverter output frequency is 45Hz.
Outdoor unit current (A)
7.0
6.0
5.0
(°F)
ture
4.0
B
or D
era
emp
t
Indo
75
70
65
3.0
45Hz
2.0
15 20 25 30 35 40 45 50 55 60 65 70 75 (°F)
Ambient temperature(°F)
31
OB444B--2.qxp
07.4.17 4:33 PM
Page 32
3. 15-class unit in single operation (OUTDOOR UNIT : MXZ-2A20NA MXZ-2A20NA (1) COOL operation
1Data is based on the condition of indoor
humidity 50%
2Air flow speed : High
3Inverter output frequency : 33Hz
<How to work fixed-frequency operation>
1.Set emergency switch to COOL or HEAT.The switch is located on indoor unit.
2.Press emergency run ON/OFF button.
3.Compressor starts running at 33Hz (COOL) or 45Hz (HEAT).
4.Indoor fan runs at High speed.
5.To cancel this operation,press emergency run ON/OFF button
or any button on remote controller.
160
r DB
6.0
)
re(°F
eratu
86
temp
5.0
80
150
Outdoor unit current (A)
Outdoor low pressure
(PSIG)
170
Indoo
)
1
e(°F
4.0
m
B te
or D
Indo
)
tur
pera
86
80
75
70
3.0
75
140
33Hz
2.0
70
130
1.0
33Hz
120
0.0
65 70 75 80 85 90 95 100 105 110 115(°F)
65 70 75 80 85 90 95 100 105 110 115 (°F)
Ambient temperature(°F)
Ambient temperature(°F)
(2) HEAT operation
1Data is based on the condition of outdoor
humidity 75%
2Set air flow to High speed.
3Inverter output frequency is 45Hz.
Outdoor unit current (A)
7.0
6.0
5.0
ure(
4.0
3.0
°F)
B te
or D
Indo
rat
mpe
75
70
65
45Hz
2.0
15 20 25 30 35 40 45 50 55 60 65 70 75 (°F)
Ambient temperature(°F)
32
OB444B--2.qxp
07.4.17 4:33 PM
Page 33
4. 09-class unit in single operation (OUTDOOR UNIT : MXZ-3A30NA MXZ-3A30NA (1) COOL operation
1Data is based on the condition of indoor
humidity 50%
2Air flow speed : High
3Inverter output frequency : 33Hz
(PSIG)
160
<How to work fixed-frequency operation>
1.Set emergency switch to COOL or HEAT.The switch is located on indoor unit.
2.Press emergency run ON/OFF button.
3.Compressor starts running at 33Hz (COOL) or 45Hz (HEAT).
4.Indoor fan runs at High speed and continues for 30 minutes.
5.To cancel this operation,press emergency run ON/OFF button
or any button on remote controller.
80
140
75
130
70
120
Outdoor unit current (A)
Outdoor low pressure
B tem
or D
Indo
6.0
86
(°F)
ture
pera
150
)
1
33Hz
5.0
ture(
4.0
B
or D
Indo
era
temp
°F)
86
80
75
70
33Hz
3.0
2.0
1.0
110
65 70 75 80 85 90 95 100 105 110 115(°F)
0.0
65 70 75 80 85 90 95 100 105 110 115(°F)
Ambient temperature(°F)
Ambient temperature(°F)
(2) HEAT operation
1Data is based on the condition of outdoor
humidity 75%.
2Set air flow to High speed.
3Inverter output frequency is 45Hz.
Outdoor unit current (A)
7.0
6.0
pe
em
5.0
r
oo
Ind
4.0
75
70
65
F)
e(°
ur
rat
t
DB
45Hz
3.0
2.0
15 20 25 30 35 40 45 50 55 60 65 70 75 (°F)
Ambient temperature(°F)
33
OB444B--2.qxp
07.4.17 4:33 PM
Page 34
5. 12-class unit in single operation (OUTDOOR UNIT : MXZ-3A30NA MXZ-3A30NA (1) COOL operation
1Data is based on the condition of indoor
humidity 50%
2Air flow speed : High
3Inverter output frequency : 33Hz
(PSIG)
160
Outdoor low pressure
86
)
ure(
5.0
150
80
140
75
130
120
6.0
70
Outdoor unit current (A)
r
Indoo
)
<How to work fixed-frequency operation>
1.Set emergency switch to COOL or HEAT.The switch is located on indoor unit.
2.Press emergency run ON/OFF button.
3.Compressor starts running at 33Hz (COOL) or 45Hz (HEAT).
4.Indoor fan runs at High speed and continues for 30 minutes.
5.To cancel this operation,press emergency run ON/OFF button
or any button on remote controller.
re(°F
eratu
mp
DB te
1
33Hz
rat
mpe
°F)
B te
or D
Indo
86
80
75
70
4.0
3.0
33Hz
2.0
1.0
110
0.0
65 70 75 80 85 90 95 100 105 110 115(°F)
65 70 75 80 85 90 95 100 105 110 115 (°F)
Ambient temperature(°F)
Ambient temperature(°F)
(2) HEAT operation
1Data is based on the condition of outdoor
humidity 75%.
2Set air flow to High speed.
3Inverter output frequency is 45Hz.
Outdoor unit current (A)
7.0
6.0
e(°
ur
rat
75
70
65
F)
pe
5.0
B
rD
tem
oo
Ind
4.0
45Hz
3.0
2.0
15 20 25 30 35 40 45 50 55 60 65 70 75 (°F)
Ambient temperature(°F)
34
OB444B--2.qxp
07.4.17 4:33 PM
Page 35
6. 15-class unit in single operation (OUTDOOR UNIT : MXZ-3A30NA MXZ-3A30NA (1) COOL operation
1Data is based on the condition of indoor
humidity 50%
2Air flow speed : High
3Inverter output frequency : 33Hz
<How to work fixed-frequency operation>
1.Set emergency switch to COOL or HEAT.The switch is located on indoor unit.
2.Press emergency run ON/OFF button.
3.Compressor starts running at 33Hz (COOL) or 45Hz (HEAT).
4.Indoor fan runs at High speed.
5.To cancel this operation,press emergency run ON/OFF button
or any button on remote controller.
6.0
(°F)
ature
per
B tem
86
rD
Indoo
5.0
Outdoor unit current (A)
Outdoor low pressure
(PSIG)
170
160
)
1
4.0
150
80
m
B te
or D
Indo
33Hz
3.0
140
75
86
80
75
70
)
re(°F
tu
pera
2.0
130
70
1.0
33Hz
120
0.0
65 70 75 80 85 90 95 100 105 110 115(°F)
65 70 75 80 85 90 95 100 105 110 115 (°F)
Ambient temperature(°F)
Ambient temperature(°F)
(2) HEAT operation
1Data is based on the condition of outdoor
humidity 75%
2Set air flow to High speed.
3Inverter output frequency is 45Hz.
Outdoor unit current (A)
7.0
6.0
°F)
re(
75
70
65
tu
era
p
5.0
B
rD
tem
oo
Ind
4.0
45Hz
3.0
2.0
15 20 25 30 35 40 45 50 55 60 65 70 75 (°F)
Ambient temperature(°F)
35
OB444B--2.qxp
07.4.17 4:33 PM
Page 36
7. 17-class unit in single operation (OUTDOOR UNIT : MXZ-3A30NA MXZ-3A30NA - 1 )
(1) COOL operation
1Data is based on the condition of indoor
humidity 50%
<How to work fixed-frequency operation>
2Air flow speed : High
1.Set emergency switch to COOL or HEAT.The switch is locat3Inverter output frequency : 33Hz
ed on indoor unit.
2.Press emergency run ON/OFF button.
3.Compressor starts running at 33Hz (COOL) or 45Hz (HEAT).
4.Indoor fan runs at High speed.
5.To cancel this operation,press emergency run ON/OFF button
or any button on remote controller.
160
6.0
(°F)
ature
per
B tem
86
rD
Indoo
5.0
Outdoor unit current (A)
Outdoor low pressure
(PSIG)
170
4.0
150
80
m
B te
or D
Indo
33Hz
3.0
140
75
86
80
75
70
)
re(°F
tu
pera
2.0
130
70
1.0
33Hz
120
0.0
65 70 75 80 85 90 95 100 105 110 115(°F)
65 70 75 80 85 90 95 100 105 110 115 (°F)
Ambient temperature(°F)
Ambient temperature(°F)
(2) HEAT operation
1Data is based on the condition of outdoor
humidity 75%.
2Set air flow to High speed.
3Inverter output frequency is 45Hz.
Outdoor unit current (A)
7.0
6.0
°F)
re(
75
70
65
tu
era
p
5.0
B
rD
tem
oo
Ind
4.0
45Hz
3.0
2.0
15 20 25 30 35 40 45 50 55 60 65 70 75 (°F)
Ambient temperature(°F)
36
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Page 37
8. 24-class unit in single operation (OUTDOOR UNIT : MXZ-3A30NA MXZ-3A30NA - 1 )
(1) COOL operation
1Data is based on the condition of indoor
humidity 50%
<How to work fixed-frequency operation>
2Air flow speed : High
1.Set emergency switch to COOL or HEAT.The switch is locat3Inverter output frequency : 33Hz
ed on indoor unit.
2.Press emergency run ON/OFF button.
3.Compressor starts running at 33Hz (COOL) or 45Hz (HEAT).
4.Indoor fan runs at High speed.
5.To cancel this operation,press emergency run ON/OFF button
or any button on remote controller.
Outdoor low pressure
170
r
Indoo
(°F)
ature
mper
DB te
7.0
86
6.0
80
160
150
140
75
Outdoor unit current (A)
(PSIG)
180
70
5.0
(°F)
ture
4.0
era
emp
Bt
or D
Indo
86
80
75
70
33Hz
3.0
2.0
33Hz
1.0
130
65 70 75 80 85 90 95 100 105 110 115 (°F)
65 70 75 80 85 90 95 100 105 110 115 (°F)
Ambient temperature(°F)
Ambient temperature(°F)
(2) HEAT operation
1Data is based on the condition of outdoor
humidity 75%
2Set air flow to High speed.
3Inverter output frequency is 45Hz.
Outdoor unit current (A)
7.0
6.0
5.0
4.0
(°F)
ture
B
or D
era
emp
t
Indo
75
70
65
45Hz
3.0
2.0
15 20 25 30 35 40 45 50 55 60 65 70 75 (°F)
Ambient temperature(°F)
37
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Page 38
ACTUATOR CONTROL
9
MXZ-2A20NA MXZ-2A20NA -
MXZ-3A30NA MXZ-3A30NA -
1
1
Relation between main sensor and actuator
Sensor
Purpose
Discharge temperature thermistor
Protection
Indoor pipe temperature thermistor
Defrosting Protection
4-way
valve
Defrosting
Defrost thermistor
Gas pipe temperature thermistor
(MXZ-2A20NA, MXZ-3A30NA)
Control
Protection
Fin temperature thermistor
Control
Ambient temperature thermistor
Protection
Outdoor heat exchanger temperature
Control
Capacity code
10
Compressor
Actuator
Outdoor
LEV
fan motor
SERVICE FUNCTIONS
10-1. Pre-heat control <MXZ-2A20NA -
1
, MXZ-3A30NA -
1
>
If moisture gets into the refrigerant cycle, or when refrigerant is liquefied and collected in the compressor, it may interfere
the start-up of the compressor.
To improve start-up condition, the compressor is energized even while it is not operating.
This is to generate heat at the winding.
The compressor uses about 50 W when pre-heat control is turned ON.
Pre-heat control is ON at initial setting.
[How to deactivate pre-heat control]
1 Turn OFF the power supply for the air conditioner before making the setting.
2 Set the 4th Dip Switch of SW1 on the outdoor electronic control P.C. board to ON to deactivate pre-heat control function (MXZ-2A20NA - 1 ).
Set the 4th Dip Switch of SW2 on the outdoor electronic control P.C. board to ON to deactivate pre-heat control function (MXZ-3A30NA - 1 ).
SW1
SW2
ON
ON
1 2 3 4 5 6
1 2 3 4
SW1
SW2
SW871
SW1
ON
MXZ-2A20NA -
SW2
1
ON
MXZ-3A30NA -
1 2 3 4 5 6
1 2 3 4
3 Turn ON the power supply for the air conditioner.
NOTE: Pre-heat control will be turned OFF when the breaker is turned OFF.
38
1
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Page 39
10-2. Auto line correcting <MXZ-3A30NA -
1
>
Outdoor unit has an auto line correcting function which automatically
detects and corrects improper wiring or piping.
Improper wiring or piping can be automatically detected by pressing the piping/wiring correction switch (SW871).
When improper wiring or piping is detected, wiring lines are corrected.
This will be completed in about 10 to 15 minutes.
[How to activate this function]
1. Check that outside temperature is above 0:.
(This function does not work when outside temperature is not above 0:.)
SW871
2. Check that the stop valves of the liquid pipe and gas pipe are open.
3. Check that the wiring between indoor and outdoor unit is correct.
(If the wiring is not correct, this function does not work.)
4. Turn ON the power supply and wait at least 1 minute.
5. Press the piping/wiring correction switch (SW871) on the electronic control P.C. board.
Do not touch energized parts.
SW871
LED indication during detection:
LED1(Red) LED2(Yellow) LED3(Green)
Lighting
Lighting
Blinking
LED indication after detection:
Indication
LED1(Red) LED2(Yellow) LED3(Green)
Lighting
Goes out
Lighting
Completed (Detected successfully)
Blinking
Blinking
Cannot be corrected
Blinking
Refer to "SAFETY PRECAUTIONS WHEN LED FLASHES"
Other indications
located behind the service panel.
W Be sure to check for closed valves, cracked pipes or clogged pipes.
6. Press the switch to cancel.
LED indication after cancel :
LED1(Red) LED2(Yellow) LED3(Green)
Lighting
Lighting
Goes out
NOTE : Indoor unit cannot be operated while this function is activated.
When this function is activated while indoor unit is operating, the operation will be stopped.
Operate indoor unit after the auto line correcting is finished.
Pressing the switch during detection cancels this function.
The record of auto line correcting can be confirmed in the following way:
Press the switch for more than 5 seconds.
LED will show the record of auto correcting for about 30 seconds as shown in the table below:
LED1(Red)
Once
3 times
Number of blinks
Wiring line
LED2(Yellow) LED3(Green)
Once
Lighting
Not corrected
3 times
Lighting
Corrected
NOTE : Activate this function to confirm the correct wiring after replacing the electronic control P.C. board.
(Previous records are deleted when the electronic control P.C. board is replaced.)
The record cannot be shown if auto line correcting is not canceled (Refer to "How to activate this function").
39
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Page 40
TROUBLESHOOTING
MXZ-2A20NA MXZ-2A20NA -
1
MXZ-3A30NA MXZ-3A30NA -
1
11-1. Cautions on troubleshooting
1. Before troubleshooting, check the following:
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for mis-wiring.
2. Take care of the following during servicing.
1) Before servicing the air conditioner, be sure to turn off the unit first with the remote controller, and then after confirming the horizontal vane is closed, turn off the breaker and/or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic
control P.C. board.
3) When removing the electrical parts, be careful to the residual voltage of smoothing capacitor.
4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the
components.
5) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
Housing point
Lead wiring
3. Troubleshooting procedure
1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality.
To make sure, check how many times the abnormality indication is flashing on and off before starting service work.
2) If the electronic control P.C. board seems to be defective, check the copper foil pattern for disconnection and the components for bursting and discoloration.
3) When troubleshooting, refer to 11-2, and 11-3. and 11-4.
11-2. Failure mode recall function
This air conditioner can memorize the abnormal condition which has occurred once.
Even though LED indication listed on the troubleshooting check table (11-4.) disappears, the memorized failure details
can be recalled.
This mode is very useful when the unit needs to be repaired for the abnormality which doesn’t recur.
1. Type of failure mode recall function
There are 2 types in failure mode recall function as shown below.
1Indoor and outdoor unit failure mode recall function
With this function, failure mode of indoor unit and a part of failure mode of outdoor unit can be recalled.
2The details of outdoor unit failure mode recall function
With this function, more detailed failure mode of outdoor unit can be recalled.
Refer to the service manual of indoor unit for how to recall the failure mode and the details of indoor unit failure mode.
The outdoor unit failure mode is indicated by the operation indicator lamp on the indoor unit and the LED of outdoor unit.
See "11-2.2. Failure mode table".
40
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Page 41
2. Outdoor unit failure mode table
The left lamp of
OPERATION INDICATOR
lamp (Indoor unit)
Abnormal point
(Failure mode / protection)
LED indication
Condition
(Outdoor P.C. board)
LED 1 LED 2
Lighting Lighting When overcurrent protection stop is
continuously performed three times
within 1 minute after the compressor
gets started, or when converter
protection stop or bus-bar voltage
protection stop is continuously
performed three times within 3
minutes after start-up.
OFF
2-time flash
None (Normal)
Outdoor power system
3-time flash
Discharge temperature
thermistor
Lighting Once
Defrost thermistor
Ambient temperature thermistor
Fin temperature thermistor
P.C. board temperature
thermistor
Lighting
Lighting
Lighting
Lighting
Outdoor heat exchanger
temperature thermistor
Lighting 9 times
Gas pipe temperature
thermistor A
Lighting 10 times When a short or open circuit is
detected in the thermistor during
cooling.
Lighting 11 times (A,B: MXZ-2A20NA, MXZ-3A30NA)
(C : MXZ-3A30NA)
Gas pipe temperature
thermistor B
Gas pipe temperature
thermistor C
4-time flash
Overcurrent
5-time flash
6-time flash
When thermistor shorts or opens
during compressor running.
Once
Twice
3 times
4 times
Correspondence
• Check the connection
of the compressor
connecting wire.
• Refer to 11-6.E
"How to check
inverter / compressor".
• Check the stop valve.
• Refer to 11-6.F "Check
of outdoor thermistors".
• Replace the outdoor
electronic control
P.C. board.
• Refer to 11-6.F "Check
of outdoor thermistors".
Lighting 12 times
Once Goes out When 28A current flow into intelligent
power module.
• Reconnect compressor
connector.
• Refer to 11-6.E "How to
check inverter/
compressor".
• Check the stop valve.
Discharge temperature
Lighting Lighting When discharge temperature exceeds
240.8˚F during operation.
Compressor can restart if discharge
temperature thermistor reads 212˚F or
less 3 minutes later.
•Check refrigerant circuit
and refrigerant amount.
• Refer to 11-6.D "Check
of LEV".
High pressure
Lighting Lighting When high-pressure is detected
with the high-pressure switch
(HPS) during operation. (MXZ-3A30)
•Check refrigerant circuit
and refrigerant amount.
• Check the stop valve.
When the outdoor heat exchanger
temperature exceeds 158˚F
during cooling or the indoor gas
pipe temperature exceeds 158˚F
during heating.
Fin temperature
3 times
Goes
out
When the fin temperature exceeds
188.6˚F during operation.
P.C. board temperature
4 times
Goes
out
When the P.C. board temperature
exceeds 158˚F during operation.
8-time flash
Outdoor fan motor
Lighting Lighting When failure occurs continuously
three times within 30 seconds after
the fan gets started.
• Refer to 11-6.G "Check
of outdoor fan motor".
9-time flash
Nonvolatile memory data
Lighting 5 times When nonvolatile memory data
cannot be read properly.
10-time flash
Discharge temperature
Lighting Lighting When the frequency of the
compressor is kept 80Hz or
more and the discharge
temperature is kept under 102.2˚F
for more than 20 minutes.
• Replace the outdoor
electronic control
P.C. board.
•Check refrigerant circuit
and refrigerant amount.
• Refer to 11-6.D "Check
of LEV".
7-time flash
• Check around outdoor
unit.
• Check outdoor unit air
passage.
• Refer to 11-6.G "Check
of outdoor fan motor".
NOTE : Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4.).
41
Indoor/outdoor
unit failure mode
recall function
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The left lamp of
OPERATION INDICATOR
lamp(Indoor unit)
11-time flash
15-time flash
Page 42
LED indication
(Outdoor P.C. board)
LED 1 LED 2
Abnormal point
(Failure mode / protection)
Correspondence
Condition
Communication error
between P.C. boards
Lighting 6 times
Communication error occurs
between the electronic control P.C.
board and power board for more
than 10 seconds.
When the communication between
boards protection stop is
continuously performed twice.
Current sensor
Lighting 7 times
• Replace the power
board.
Zero cross detecting circuit
5 times
When a short or open circuit is
detected in the current sensor
during compressor operating.
Current sensor protection stop is
continuously performed twice.
When zero cross signal cannot be
detected while the compressor is
operating.
The protection stop of the zero
cross detecting circuit is
continuously performed 10 times.
Converter
5 times Goes
out
When a failure is detected in the
operation of the converter during
operation.
• Replace the power
board.
Bus-bar voltage
(1)
5 times
When the bus-bar voltage exceeds
400V or falls to 200V or below
during compressor operating.
Bus-bar voltage
(2)
wEven if this protection stop is
performed continuously three
times, it does not mean the
abnormality in outdoor power
system.
6 times Goes
out
When the bus-bar voltage exceeds
400V or falls to 50V or below during
compressor operating.
LEV for drain
Lighting Lighting
When the indoor unit detects any
abnormal in the LEV for drain.
Goes
out
Goes
out
Indoor/outdoor
unit failure mode
recall function
• Check the connecting
wire between outdoor
electronic control
P.C. board and power
board.
• Check the connecting
wire among electronic
control P.C. board,
noise filter P.C. board
and power board.
• Refer to 11-6.D "Check
of LEV".
• Check the drain pump of
the indoor unit.
NOTE : Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4.).
11-3. Instruction of troubleshooting
• Check the indoor unit with referring to the indoor unit service manual, and confirm that there is any problem in the indoor
unit.
Then, check the outdoor unit with referring to this page.
Operation start
Check the outdoor unit
LED indicator.
OFF
LED 1 or LED 2
has blinked.
Both LED 1 and
LED 2 lighting
Refer to 11-4.
"Troubleshooting check table".
Refer to 11-6.
A "Check of power supply".
• Indoor unit
serial signal
error
Refer to 11-6.
B "How to
check
mis-wiring and
serial signal
error".
• COOL or
HEAT
operation only
Refer to 11-6.
C "Check of
R.V. coil".
• When cooling, heat
exchanger of
non-operating indoor
unit frosts.
•When heating, nonoperating indoor unit
gets warm.
Refer to 11-6.
D "Check of LEV".
• When cooling,
dew drops in the
non-operating
indoor unit.
Check of mispiping
42
• When heating,
room does not get
warm.
Refer to 11-6.E
"How to check
inverter/ compressor".
Check mis-piping,
shortage of capacity.
• When cooling,
room is not
cool.
Refer to 11-6.E
"How to check
inverter/
compressor".
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Page 43
11-4. Troubleshooting check table
No. Symptom
Outdoor unit
does not
operate.
Indication
LED1(Red) LED2(Yellow)
Condition
Abnormal point / Condition
Correspondence
• Refer to 11-6.D "Check of LEV".
• Check the drain pump of the indoor unit.
Lighting
Once
LEV for drain
When the indoor unit detects any abnormality in the LEV for drain.
2
Lighting
Twice
Outdoor power system
• Check the connection of the compressor connecting
When over current protection stop is continuously performed three times
wire.
within 1 minute after the compressor gets started, or when converter
protection stop or bus-bar voltage protection stop is continuously performed • Refer to 11-6.E "How to check inverter/compressor".
three times within 3 minutes after start-up.
• Check the stop valve.
3
Lighting
3 times
Discharge temperature
thermistor
When a short circuit is detected in the thermistor during operation, or
when an open circuit is detected in the thermistor after 10 minutes
of compressor start-up.
4
Lighting
4 times
1
5
Lighting
Fin temperature
thermistor
P.C board temperature
thermistor
Ambient temperature
thermistor
When a short or open circuit is detected in the thermistor during
operation.
When a short circuit is detected in the thermistor during operation, or
when an open circuit is detected in the thermistor after 5 minutes (in
cooling) and 10 minutes (in heating) of compressor start-up.
Defrost thermistor
When a short circuit is detected in the thermistor during operation, or
when an open circuit is detected in the thermistor after 5 minutes of
compressor start-up.
Nonvolatile memory data
When the nonvolatile memory data cannot be read properly.
• Replace the outdoor electronic control P.C. board.
• Replace the power board.
5 times
7 times
7
Lighting
8 times
Current sensor
Current sensor protection stop is continuously performed twice.
When a short or open circuit is detected in the thermistor during
cooling.
(A,B : MXZ-2A20NA, MXZ-3A30NA)
(C : MXZ-3A30NA)
8
Lighting
10 times
Gas pipe temperature
thermistor A
Gas pipe temperature
thermistor B
Gas pipe temperature
thermistor C
9
Lighting
11 times
Communication error
between P.C. boards
10
Lighting
12 times
Zero cross detecting
circuit
When the communication protection stop between boards is
continuously performed twice.
The protection stop of the zero cross detecting circuit is continuously
performed 10 times.
IPM protection
When overcurrent is detected after 30 minutes of compressor start-up.
Lock protection
When overcurrent is detected within 30 minutes of compressor
start-up
12
13
Goes out
3 times
Goes out
4 times
Goes out
14
5 times
Goes out
15
8 times
Goes out
Discharge temperature
protection
Fin temperature
protection
P.C. board temperature
protection
High-pressure
protection
Converter protection
Bus-bar voltage
protection (1)
Bus-bar voltage
protection (2)
16
9 times
Goes out
17
13 times
Goes out
Outdoor fan motor
8 times
Current sensor
protection
18
Lighting
• Replace the outdoor electronic control P.C. board.
Outdoor heat exchanger
temperature thermistor
Lighting
11
• Refer to 11-6.F "Check of outdoor thermistors".
When a short or open circuit is detected in the thermistor during
operation.
6
'Outdoor unit
stops and
restarts 3
Twice
minutes
later' is
repeated.
• Refer to 11-6.F "Check of outdoor thermistors".
19
Lighting
11 times
Communication between P.C.
boards protection
20
Lighting
12 times
Zero cross detecting circuit
protection
• Refer to 11-6.F "Check of outdoor thermistors".
• Check the connecting wire between outdoor electronic control
P.C. board and power board.
• Check the connecting wire among outdoor electronic control
P.C. board, noise filter P.C. board and power board.
• Reconnect compressor connector.
• Refer to 11-6.E "How to check inverter/compressor".
• Check the stop valve.
• Check the power module (PAM module).
When discharge temperature exceeds 240.8˚F during operation. Compressor • Check the amount of gas and refrigerant circuit.
can restart if discharge temperature thermistor reads 212˚F or less 3
• Refer to 11-6.D "Check of LEV".
minutes later.
When the fin temperature exceeds 188.6˚F during operation.
•Check refrigerant circuit and refrigerant amount.
•Refer to 11-6.G "Check of outdoor fan motor".
When the P.C. board temperature exceeds 158˚F during operation.
When high-pressure is detected with the high-pressure switch (HPS)
during operation.(MXZ-3A30)
When the outdoor heat exchanger temperature exceeds 158˚F
during cooling or when indoor gas pipe temperature exceeds 158˚F
during heating.
When a failure is detected in the operation of the converter during
operation.
When the bus-bar voltage exceeds 400V or falls to 200V or below
during compressor operating.
When the bus-bar voltage exceeds 400V or falls to 50V or below
during compressor operating.
When failure occurs continuously three times within 30 seconds after
the fan gets started.
When a short or open circuit is detected in the current sensor during
compressor operating.
Communication error occurs between the outdoor electronic control P.C.
board and power board for more than 10 seconds.
When zero cross signal cannot be detected while the compressor is
operating.
• Check around of gas and the refrigerant circuit.
• Check of stop valve.
• Replace the power board.
• Replace the power board.
• Refer to 11-6.G "Check of outdoor fan motor".
• Replace the power board.
• Check the connecting wire between outdoor electronic control
P.C. board and power board.
• Check the connecting wire among outdoor electronic control
P.C. board, noise filter P.C. board and power board.
Outdoor electronic control P.C. board(Parts side)
NOTE 1. The location of LED is illustrated at the right figure. Refer to 11-7.1.
2. LED is lighted during normal operation.
LED2 LED1
The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the flashing frequency is “2”.
0.5-second ON
ON
2.5-second OFF
• Refer to 11-6.F "Check of outdoor thermistors".
2.5-second OFF
OFF
43
Lighting
0.5-second ON
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No. Symptom
Indication
LED1(Red) LED2(Yellow)
Outdoor unit
21 operates.
Once
Twice
Lighting
Lighting
22
Page 44
Condition
Abnormal point / Condition
Primary current protection
When the input current exceeds 15A.
Secondary current protection
When the current of the compressor exceeds 15A.
High-pressure protection
When the indoor gas pipe temperature exceeds 113˚F during heating.
Defrosting in cooling
When the indoor gas pipe temperature falls 37.4˚F or below during cooling.
Correspondence
These symptoms do not mean any abnormality of the
product, but check the following points.
• Check if indoor filters are clogged.
• Check if refrigerant is short.
• Check if indoor/outdoor unit air circulation is short cycled.
23
3 times
Lighting
Discharge temperature
protection
When the frequency of the compressor is kept 80Hz or more and
the discharge temperature is kept under 122˚F(COOL mode)
/104˚F(HEAT mode) for more than 40 minutes.
• Check refrigerant circuit and refrigerant amount.
• Refer to 11-6.D "Check of LEV".
• Refer to 11-6.F "Check of outdoor thermistors".
24
4 times
Lighting
Low discharge
temperature protection
When the frequency of the compressor is kept 80Hz or more and
the discharge temperature is kept under 102.2˚F for more than 20
minutes.
• Refer to 11-6.D "Check of LEV".
• Check refrigerant circuit and refrigerant amount.
When the outdoor heat exchanger temperature exceeds 136.4˚F
during operation.
This symptom does not mean any abnormality of the
product, but check the following points.
• Check if indoor filters are clogged.
• Check if refrigerant is short.
• Check if indoor/outdoor unit air circulation is short cycled.
When the unit is operated with emergency operation switch.
25
5 times
Lighting
Cooling high-pressure
protection
Outdoor unit
26 operates
normally.
9 times
Lighting
Inverter check mode
27
Lighting
Lighting
Normal
-
-
-
Outdoor electronic control P.C. board(Parts side)
LED2 LED1
NOTE 1. The location of LED is illustrated at the right figure. Refer to 11-7.1.
2. LED is lighted during normal operation.
The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the flashing frequency is “2”.
0.5-second ON
ON
2.5-second OFF
2.5-second OFF
OFF
44
Lighting
0.5-second ON
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Page 45
11-5. Trouble criterion of main parts
MXZ-2A20NA MXZ-2A20NA -
1
MXZ-3A30NA MXZ-3A30NA -
Part name
Defrost thermistor
(RT61)
1
Check method and criterion
Measure the resistance with a tester.
Ambient temperature
thermistor (RT65)
Outdoor heat exchanger
temperature thermistor
(RT68)
Refer to 11-7. “Test point diagram and voltage”,1. “Outdoor electronic control P.C.
board”, the chart of thermistor.
Gas pipe temperature
thermistor (RT6A~C)
MXZ-2A20NA
MXZ-3A30NA
Discharge temperature
thermistor (RT62)
Measure the resistance with a tester.
Before measurement, hold the thermistor with your hands to warm it up.
Fin temperature
thermistor (RT64)
Refer to 11-7. “Test point diagram and voltage”,1. “Outdoor electronic control P.C.
board”, the chart of thermistor.
Compressor
W
V
WHT
Measure the resistance between terminals using a tester.
(Winding temperature : 14˚F ~ 104˚F)
Normal (Each phase)
RED
U
BLK
Outdoor fan motor
RED
WHT
BLK
MXZ-2A20NA
MXZ-2A20NA
- 1
MXZ-3A30NA
MXZ-3A30NA - 1
0.39" ~ 0.49"
0.86Ω ~ 1.06Ω
1.29" ~ 1.49"
Measure the resistance between lead wires using a tester.
(Part temperature : 14˚F ~ 104˚F)
U (W)
Normal (Each phase)
V (V)
13.4" ~ 16.4"
W (U)
Measure the resistance using a tester. (Part temperature : 14˚F ~ 104˚F)
Normal
R.V. coil
1.2k" ~ 1.56k"
Linear expansion valve
WHT
RED
LEV
ORN
YLW BRN BLU
High pressure switch
(HPS)
MXZ-3A30NA
MXZ-3A30NA - 1
Measure the resistance using a tester.(Part temperature : 14˚F ~ 104˚F)
Normal
Color of lead wire
WHT - RED
RED - ORN
YLW - BRN
BRN - BLU
HPS
37.4" ~ 53.9"
Pressure
537 ± 22 PSIG
7 PSIG
696 +- 15
45
Normal
Close
Open
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Page 46
11-6. Troubleshooting flow
MXZ-2A20NA MXZ-2A20NA -
1
MXZ-3A30NA MXZ-3A30NA -
Outdoor unit does not operate. (LED display: display OFF)
A Check of power supply
Check the connecting of parts of main power supply circuit.
Turn ON the power supply.
Is there voltage of 208/230V AC in the
power supply terminal block?
No
Check the power supply cable.
Yes
Is the output voltage from the noise
filter P.C. board 208/230V AC?
No
Replace the noise
filter P.C. board.
Yes
Is the input voltage to the power board
208/230V AC?
No
Replace the reactor.
Yes
Is the input voltage to the outdoor
electronic control P.C. board 294/325V DC?
No
Replace the power board.
Yes
Replace the outdoor electronic control
P.C. board.
46
1
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Page 47
• When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch.
Indoor unit does not operate.
• When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second.
Outdoor unit does not operate.
B How to check mis-wiring and serial signal error
Turn OFF the power supply.
Is there rated voltage in
the power supply?
No
Check the power
supply.
Yes
LED indication
for communication status
Turn ON the power supply.
Communication status is indicated
by the LED.
Unit status
Blinking: normal communication
Lighting: abnormal communication or
not connected
Pattern 1 and 2 is repeatedly displayed
alternately. Each pattern is displayed for
15 seconds.
NOTE: "Lighting" in the table below does not
indicate abnormal communication.
Is there rated voltage between
outdoor terminal block S1 and
S2?
No
Check the wiring.
Yes
Press EMERGENCY OPERATION switch once.
Does the left lamp of OPERATION
INDICATOR lamp light up?
<Confirmation of the power to the indoor unit>
No
Yes
MXZ-2A20NA
MXZ-2A20NA MXZ-3A30NA
Is serial signal error indicated 6 minutes later?
1
No
Yes
Outdoor electronic control P.C. board
(Parts side)
Is there any mis-wiring,
poor contact, or wire
disconnection of the
indoor/outdoor
connecting wire?
Yes
Correct them.
No
LED3 LED2 LED1
A
Blinking
Pattern
LED 3
LED 2
LED 1
1
Lighting
Unit B
status
2
Goes out
Lighting
Unit A
status
Unit C
status
MXZ-3A30NA -
1
Outdoor electronic control P.C. board
Turn OFF the power supply.
Check once more if the indoor/outdoor
B connecting wire is not mis-wiring.
Short-circuit outdoor terminal block S2 and
S3.
W1
W1 Mis-wiring may damage indoor electronic control
P.C. board during the operation.
Be sure to confirm the wiring is correct before the
operation starts.
Turn ON the power supply.
(Parts side)
LED1 LED2 LED3
Does the LED on the outdoor electronic
control P.C. board repeat "3.6-second-OFF
and 0.8-second-ON quick blinking"?
Blinking
Pattern
LED 1
LED 2
LED 3
1
Unit A
status
Unit B
status
Unit C
status
2
Lighting
Lighting
Goes out
A
· Turn OFF inverter-controlled lighting
equipment.
· Turn OFF the power supply and then
turn ON again.
· Press EMERGENCY OPERATION
switch.
Is serial signal
error indicated
6 minutes later?
Yes
B
· Reinstall
either the
unit or the
light each
No other away.
· Attach a filter
on remote
control
receiving
section of
the indoor
unit.
Replace the outdoor electronic control
No
P.C. board.
(Lighted
W2
or
not lighted) W2 Be careful to the residual
voltage of smoothing capacitor.
Yes
Turn OFF the power supply.
Remove the short-circuit between
outdoor terminal block S2 and S3.
Turn ON the power supply.
Is there amplitude of 10 to 20V DC
between outdoor terminal block S2
and S3? <Confirmation of serial
signal>
No
Is there any error of the
indoor/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
Yes Replace the
indoor/outdoor
connecting wire.
No
Yes
Is there rated voltage between
indoor terminal block S1 and S2?
<Confirmation of power voltage>
No
Is there any error of the
indoor/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
Yes
No
Replace the indoor electronic control P.C. board.
Be sure to release the failure-mode
recall function after checking.
Refer to indoor unit service manual.
47
Yes Replace the
indoor/outdoor
connecting wire.
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Page 48
The cooling operation or heating operation does not operate. (LED display: Both LED1 and LED2 lighting)
C Check of R.V. coil
CN912
CN781
Noise filter P.C. board
Outdoor electronic control
P.C. board
• When heating operation does not work.
1. Disconnect the lead wire leading to the compressor.
2. 3 minutes after turning ON the power supply, start EMERGENCY
OPERATION in HEAT mode.
Is there voltage of 208/230V AC between pin1
and pin 2 at connector CN912?
No
Yes
1. Turn OFF the power supply of indoor and outdoor unit, and
disconnect the connector CN781.
2. 3 minutes after turning ON the power supply, start
EMERGENCY OPERATION in HEAT mode.
Turn OFF the power supply of indoor and outdoor unit.
Disconnect the connector
CN912. Is there normal
resistance to R.V. coil?
No
Replace the R.V. coil.
Is there voltage of 12V DC
No
between the connector
CN781 pin 5 (+) and pin 3 (-) ?
Yes
Replace the outdoor
electronic control P.C.
board.
Yes
Replace the power P.C. board or
the noise filter P.C. board.
Replace the 4-way valve.
• When cooling operation does not work.
1. Disconnect the lead wire leading to the compressor.
2. 3 minutes after turning ON the power supply, start EMERGENCY
OPERATION in COOL mode.
Is there voltage of 208/230V AC between pin1
and pin 2 at connector CN912? W
Yes
No
Replace the 4-way valve.
W If the connector CN912 is not connected or R.V. coil is open, voltage
occurs between terminals even when the control is OFF.
1. Turn OFF the power supply of the indoor and the outdoor unit,
and disconnect the connector CN781.
2. 3 minutes after turning ON the power supply, start
EMERGENCY OPERATION in COOL mode.
Is there voltage of 12V DC
between the connector CN781
pin 5 (+) and pin 3 (-) ?
No
Replace the noise filter P.C. board.
Yes
Replace the outdoor electronic control P.C. board.
48
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• When cooling, heat exchanger of non-operating indoor unit frosts.
• When heating, non-operating indoor unit get warm.
D Check of LEV
Turn ON the power supply to the outdoor unit after checking LEV coil is mounted to
the LEV body securely.
Yes
Is "click - click" sound heard?
Or, do you feel vibration of LEV coil with your hand?
Normal
No
Disconnect the connectors.
CN791: LEV A, CN792: LEV B, CN793: LEV C,
CN795: LEV E, CN796: LEV F
Is there normal resistance to LEV coil?
Yes
Replace the outdoor electronic control P.C. board.
No
Replace LEV coil.
49
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• When heating, room does not get warm.
• When cooling, room does not get cool.
E How to check inverter/ compressor
Disconnect the terminal of the compressor. 3 minutes after turning ON the power supply, start
EMERGENCY OPERATION.
Measure the voltage between each
lead wire leading to the compressor.
U (BLK) - V (WHT)
V (WHT) - W (RED)
W (RED) - U (BLK)
Output voltage
COOL: 150V(48Hz) HEAT: 170V(64Hz)
Is voltage output? W1, W2
Yes
No
Is output balanced?
Yes
W1 • After the outdoor fan starts running, wait for 1 minute
or more before measuring the voltage.
• The output voltage values have the tolerance of i20%.
W2 • The output differs depending on the capacity or the
No number of indoor units to be operated.
Is the input voltage to the outdoor electronic
control P.C. board 370V or more?
No
Replace the power board.
Yes
Turn OFF the power supply of indoor and
outdoor unit, and measure the compressor
winding resistance between the compressor
terminals.
Is the resistance between each terminal normal?
Yes
No
Replace the
compressor.
Reconnect the lead wire of compressor, and turn ON
the power supply to indoor and outdoor unit.
3 minutes later, start EMERGENCY OPERATION.
Clarify the causes by counting time until the inverter stops.
0 to 10 seconds: compressor layer short
10 to 60 seconds: compressor lock
60 seconds to 5minutes: refrigerant circuit defective
5 minutes or more: normal
50
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• When thermistor is abnormal.
F Check of outdoor thermistors
Disconnect the connector in the following table and
measure the resistance of the thermistor to check
whether the thermistor is normal or not.
Abnormal
Replace the thermistor except RT64.
In case that RT64 is abnormal, replace the
outdoor power board since RT64 is combined
with the outdoor power board.
Normal
Reconnect the connector in the following table and
disconnect the lead wire leading to the compressor.
3 minutes after turning ON the power supply,
start EMERGENCY OPERATION.
No
Does the unit operate 10 minutes or more without
showing thermistor abnormality?
Replace the outdoor electronic control
P.C. board or the outdoor power board.
Yes
Normal
Connector, Pin No.
Board
Symbol
Thermistor
RT61 Between CN661 pin1 and pin2
Defrost
RT62 Between CN661 pin3 and pin4
Discharge temperature
RT68 Between CN661 pin7 and pin8
Outdoor heat exchanger temperature
RT6A Between CN662 pin1 and pin2
Gas pipe temperature (Unit A) w
Outdoor electronic control P.C. board
RT6B Between CN662 pin3 and pin4
Gas pipe temperature (Unit B) w
RT6C Between CN662 pin5 and pin6
Gas pipe temperature (Unit C) w
RT65 Between CN663 pin1 and pin2
Ambient temperature
Outdoor power board
RT64 Between CN3 pin1 and pin2
Fin temperature
1
1
w Except MXZ-2A20NA and MXZ-3A30NA - .
• Fan motor does not operate or stops operating shortly after starting the operation.
G Check of outdoor fan motor
Check the connection between the
connectors CN931 and CN932.
Is the resistance between each terminal
of outdoor fan motor normal?
Yes
No
Disconnect CN932 from outdoor electronic control P.C. board, and
turn ON the power supply.
Rotate the outdoor fan motor manually and measure the voltage of
CN931.
Between 1(+) and 5(-)
Between 2(+) and 5(-)
Between 3(+) and 5(-)
(Fixed to either 5V or 0V DC) No
No
Replace the outdoor DC fan motor.
Does the voltage between each terminal become 5V DC and 0V DC
repeatedly?
Yes
Does the outdoor fan motor rotate smoothly?
Yes
Replace the outdoor electronic control P.C. board.
51
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Page 52
• When the operation frequency does not go up from lowest frequency.
H Check of HPS
MXZ-3A30NA MXZ-3A30NA -
1
1. Disconnect the connector CN681 in the electronic control P.C. board.
2. Check the resistance of HPS after 1 minute has passed since the outdoor unit power supply was turned OFF.
Check the resistance between
each terminal.
Infinity
Replace HPS.
0"
Reconnect CN681.
Turn ON the power supply to the indoor and outdoor unit.
3 minutes later, start EMERGENCY OPERATION.
Is HPS protection displayed
immediately after compressor
starts?
Yes
Replace the electronic control P.C. board.
No
Normal
I The other cases
Indoor unit does not operate. (different operating models in multi system)
• When you try to run two indoor units simultaneously, one for cooling and the other for heating, the unit which
transmits signal to the outdoor units earlier decides the operation mode.
• When the above situation occurs, set all the indoor units to the same mode, turn OFF the indoor units, and
then turn them back ON.
• Though the top of the indoor unit sometimes gets warm, this does not mean malfunction. The reason is that
the refrigerant gas continuously flows into the indoor unit even while it is not operating.
52
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Page 53
11-7. Test point diagram and voltage
1. Outdoor electronic control P.C. board
MXZ-2A20NA MXZ-2A20NA -
MXZ-3A30NA
1
Discharge temperature thermistor (RT62)
300
200
120
100
80
60
0
80
70
60
50
40
30
20
20
32 50 68 86 104 122 140 158 176
Temperature (˚F)
10
0
-4
LEV E
-14
32
50
68
86
104
Temperature (˚F)
w Except MXZ-2A20NA -
1
.
(
(
(–)
(
(+) (
(
(
(
(
CN931 GND
5V
5V DC
pulse wave
CN932
20-90V AC
CN795
12V DC
pulse wave
(
To fan
motor
(
CN781
(+)
12V
R.V. coil (–)
DC Rush current relay (–)
GND (power board)
Temperature (˚F)
140
15V
15V
CN702
(–)
Signal reception
(From power board) GND
86 104 122 140 158 176 194 212 230 248
90
160
40
5V DC pulse wave
(+)
CN701
Signal transmission (+)
(To power board)
(–)
5V DC pulse wave
CN663 Ambient temperature
thermistor (RT65)
68
Outdoor heat exchanger
temperature thermistor (RT68) (
100
CN661
400
50
100
Resistance (k")
Resistance (k")
500
Discharge temperature thermistor (RT62) (
Defrost thermistor (RT61) (
Resistance (k")
600
32
Fin temperature
thermistor (RT64)
200
180
700
0
Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Gas pipe temperature thermistor (RT6A,6B,6C)w
Outdoor heat exchanger temperature
thermistor (RT68)
LED 1
LED 2
LED 3
SW1
CN603
Serial signal Room C
12~24V DC
CN801
294V DC
~
370V DC
Input
CN602
Serial signal Room B
12~24V DC
F801
FUSE
T3.15AL250V
CN601
208/230V AC
Input
Serial signal
Room A
(
(
(
(
(
(
(
(
(
(
(–)
12V DC
pulse wave
LEV Room
A
12V DC
pulse wave
LEV Room
B
12V DC
pulse wave
LEV Room
C
53
CN791
(+)
(–)
CN792
(+)
CN793
(–)
(+)
MXZ-3A30NA
CN681
High pressure switch
Gas pipe A thermistor w
Gas pipe B thermistor w
CN662
Gas pipe C thermistor w
(
(
(
12~24V DC
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MXZ-3A30NA -
Page 54
Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Fin temperature thermistor (RT64) Outdoor heat exchanger temperature thermistor (RT68)
1
200
100
180
500
400
300
120
100
80
60
0
0
10
20
30
40
50
60
70
80
90
100 110 120
Temperature (:)
60
50
20
10 20 30 40 50 60 70 80
Temperature (:)
0
70
30
20
100
80
40
40
200
0
140
Rush current relay (–)
GND
GND
15V DC
CN702 Signal reception
(From power board)
5V DC pulse wave
CN701 Signal transmission
(To power board)
5V DC pulse wave
CN663 Ambient temperature
thermistor (RT65)
CN661 Outdoor heat exchanger
temperature thermistor (RT68)
Discharge temperature thermistor (RT62)
Defrost thermistor (RT61)
GND
5V DC
5V DC
pulse wave
Resistance (kΩ)
600
90
160
Resistance (kΩ)
Resistance (kΩ)
Discharge temperature thermistor (RT62)
700
10
0
-20
-10
0
10
20
30
40
Temperature (:)
(
(
CN781 R.V. coil (–)
(+)
To fan
motor
CN932
20-90V AC
(
LED 1
LED 2
LED 3
F931
FUSE
T3.15AL250V
CN621
Serial signal Room C
12~24V DC
SW1
SW2
SW871
CN611
Serial signal Room B
12~24V DC
CN801
294~370 V DC
Input
CN601
208/230V AC
Input
Serial signal
Room A
12~24V DC
F801
FUSE
T3.15AL250V
{(
–
+
CN796
LEV F
12VDC
pulse wave
(
CN793
LEV Room C
CN792
LEV Room B
CN681
High pressure switch
54
CN791
LEV Room A
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Page 55
2. Noise filter P.C. board
MXZ-2A20NA
MXZ-2A20NA CN901
To electronic CN902
To power
control
board
P.C. board
MXZ-3A30NA
1
CN903
To power
board
{
{
208/230V AC
Input
{
{
CN912
R.V. coil
208/230V AC
208/230V AC
Output
NR64 VARISTOR
MXZ-3A30NA -
1
F64 FUSE
T2AL250V
F911 FUSE
T1AL250V
CN912
R.V. coil
208/230V AC
{
CN903
To power
board
{
{
CN901
To electronic CN902
control
To power
P.C. board board
208/230V AC
Output
208/230V AC
Output
208/230V AC
Output
F65
FUSE
T6.3AL250V
F64
FUSE
T2AL250V
208/230V AC
Input
55
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3. Outdoor Power board
Page 56
MXZ-2A20NA MXZ-2A20NA -
1
MXZ-3A30NA MXZ-3A30NA -
1
Connect to the compressor
Voltage among phases: 5V to
180V
294-370V DC
Output
(Red)
(+) 1
Connect to the earth
CN2
Connect to the controller board
(+)1-5(–): Signal transmission
(To electronic control P.C. board)
5V DC pulse wave
(+)2-5(–): Zero cross signal
3-4 : Not used
(+)6-5(–): 15V
(+)7-5(–): 15V
(–) 3
(White)
CN3
Fin temperature thermistor RT64
reception (From
) Signal
electronic control P.C. board)
5V DC pulse wave
CN5
Primary current detection
(Connect to the noise filter)
Connect to the compressor
Voltage among phases: 5V to 180V
Connect to the earth
294-370V DC
Output
(Red)
(+) 1
CN2
Connect to the controller board
(+)1-5(–): Signal transmission
(To electronic control P.C. board)
5V DC pulse wave
(+)2-5(–): Zero cross signal
3-4 : Not used
(+)6-5(–): 15V
(+)7-5(–): 15V
(–) 3
(White)
CN3
Fin temperature thermistor RT64
reception (From
) Signal
electronic control P.C. board)
5V DC pulse wave
CN5
Primary current detection
(Connect to the noise filter)
56
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12
Page 57
DISASSEMBLY INSTRUCTIONS
<"Terminal with locking mechanism" Detaching points>
The terminal which has the locking mechanism can be detached as shown below.
There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism.
The terminal without locking mechanism can be detached by pulling it out.
Check the shape of the terminal before detaching.
(1) Slide the sleeve and check if there is a locking lever or not.
(2) The terminal with this connector has the
locking mechanism.
Sleeve
Locking lever
1Slide the sleeve.
2Pull the terminal while
pushing the locking
lever.
12-1. MXZ-2A20NA MXZ-2A20NA OUTDOOR UNIT
1Hold the sleeve, and
pull out the terminal
slowly.
Connector
1
OPERATING PROCEDURE
PHOTOS
1. Removing the compressor
Photo 1
(1)Remove the screws of the top panel, and remove the top
panel.
(2)Remove the screws of the service panel, and remove the
service panel.
Recover refrigerant gas.
(3)Remove the screws of the cabinet, and remove the cabinet.
(4)Remove the screws of the back panel, and remove the back
panel (Photo 3).
(5)Disconnect the compressor lead wire from terminal of the
compressor (U, V, W).
(6)Disconnect the outdoor electronic control P.C. board
connectors:
CN661, CN662 (MXZ-2A20NA), CN663, CN791, CN792,
CN795, CN931, CN932
Disconnect the noise filter P.C. board connector:
CN912
(7)Remove the screws of the electrical parts, and remove the
electrical parts (Photo 4).
(8)Remove the propeller.
(9)Remove the screws of the separator, and remove the
separator (Photo 6).
(10)Remove the sound proof felt (Photo 6).
(11)Detach the welded parts of the compressor suction and discharge pipes (Photo 5).
(12)Remove the compressor nuts and remove the compressor.
Screws of
the cabinet
Screws of
service
panel
Screw of
the cabinet
Screws of the cabinet
Photo 2
Screws of the
top panel
Screws of the
cabinet
57
Screws of the
top panel
Screws of the cabinet
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Page 58
PHOTOS
OPERATING PROCEDURE
Photo 3
Screw of
the rear guard
Screws of
the back
panel
Photo 5
R.V. coil
4-way valve
Screws of
the back panel
LEV coil E
Expansion valve E
Screws of
the back panel
Discharge
pipe welded part
Photo 4
Suction pipe
welded part
Compressor nuts
Screws of
the electrical
parts
Photo 6
2. Removing the fan motor
(1)Remove the top panel, the service panel, and the cabinet
(Photo 1).
(2)Disconnect the connectors CN931 and CN932 on the outdoor
electronic control P.C. board.
(3)Remove the propeller.
(4)Remove the fan motor.
Screws of the outdoor fan motor
Propeller
Propeller nut
58
Separator
Sound
proof
felt
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Page 59
OPERATING PROCEDURE
PHOTOS
3. Removing the 4-way valve
Photo 7
(1)Remove the top panel (Photo 1).
(2)Remove the service panel, the cabinet and the back panel
(Photo 1, 2, 3).
Recover refrigerant gas.
(3)Remove the electrical parts (Photo 4).
(4)Detach the welded parts of 4-way valve and pipe.
R.V. coil
4-way valve
Welded parts
4. Removing the expansion valve
Photo 8
(1)Remove the top panel (Photo 1).
(2)Remove the service panel, the cabinet and the back panel
(Photo 1, 2, 3).
(Gas recovery is not required if the unit is pumped down.)
(3)Remove the cabinet for removing LEV E (Photo 1, 2, 5).
(4)Remove the electrical parts for removing LEV E (Photo 4, 5).
(5)Remove the LEV coils.
(6)Detach the welded parts of expansion valves and pipes.
Expansion
valves
LEV coils
5. Removing the reactor
(1)Remove the top panel (Photo 1).
(2)Remove the service panel, cabinet, back panel and the relay
panel.
(3)Disconnect the reactor lead wire from the terminal of the
reactor.
(4)Remove the screws of the reactor, and remove the reactor
(Photo 9).
Photo 9
Screws of the reactor
59
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Page 60
12-2. MXZ-3A30NA
OUTDOOR UNIT
OPERATING PROCEDURE
PHOTOS
1. Removing the compressor
Photo 1
(1)Remove the screws of the top panel, and remove the top
panel (Photo 1).
(2)Remove the screws of the service panel, and remove the
service panel (Photo 1).
Recover refrigerant gas.
(3)Remove the screws of the front panel, and remove the front
panel.
(4)Disconnect the compressor lead wire from terminal of
compressor (U, V, W).
(5)Disconnect the outdoor electronic control P.C. board
connectors:
CN661, CN662 , CN663, CN681, CN791, CN792, CN793,
CN795, CN931, CN932
Disconnect the noise filter P.C. board connector:
CN912
(6)Remove the screws of the electrical parts, and remove the
electrical parts (Photo 2).
(7)Remove the propeller.
(8)Remove the screws of the separator, and remove the
separator.
(9)Remove the sound proof felt.
(10)Detach the welded parts of the compressor suction and discharge pipes (Photo 3).
(11)Remove the compressor nuts and remove the compressor.
Screws of
service
panel
Screws of the front panel
Photo 2
Screws
of the
electrical
parts
Photo 3
LEV coil E
Expansion
valve E
Suction
pipe
welded
part
Discharge
pipe
welded
part
60
Screws of the top panel
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Page 61
PHOTOS
OPERATING PROCEDURE
Photo 4
2. Removing the fan motor
(1)Remove the top panel, the service panel, and the front panel
(Photo 1).
(2)Disconnect the connectors CN931 and CN932 on the outdoor
electronic control P.C. board.
(3)Remove the propeller.
(4)Remove the fan motor.
Screws of the outdoor fan motor
Separator
Propeller
Sound
proof
felt
Propeller nut
3. Removing the 4-way valve
Compressor nuts
Photo 5
(1)Remove the top panel (Photo 1).
(2)Remove the service panel, rear panel, and pipe cover.
Recover refrigerant gas.
(3)Remove the electrical parts (Photo 2).
(4)Detach the welded parts of 4-way valve and pipe.
4 way valve
R.V. coil
Welded parts
4. Removing the expansion valve
(1)Remove the top panel (Photo 1).
(2)Remove the service panel (Photo 1).
(Gas recovery is not required if the unit is pumped down.)
(3)Remove the front panel for removing LEV E (Photo 1, 3).
(4)Remove the electrical parts for removing LEV E (Photo 2, 3).
(5)Remove the LEV coils.
(6)Detach the welded parts of expansion valves and pipes.
Photo 6
LEV coils
61
Expansion
valves
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07.4.17 1:40 PM
Page 62
OPERATING PROCEDURE
PHOTOS
5. Removing the reactor
(1)Remove the top panel (Photo 1).
(2)Disconnect the reactor lead wire.
(3)Remove the screws of the reactor, and remove the reactor.
Photo 7
Screws of the reactor
62
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Page 63
12-3. MXZ-3A30NA - 1
OUTDOOR UNIT
OPERATING PROCEDURE
PHOTOS
Photo 1 Screws of the top panel
1. Removing the compressor
(1)Remove the screws of the top panel, and remove the top
panel.
(2)Remove the screws of the service panel, and remove the service panel.
Recover refrigerant gas.
(3)Remove the screws of the front panel, and remove the front
panel.
(4)Remove the screws of the rear panel, and remove the rear
panel.
(5)Disconnect the compressor lead wire from terminal of
compressor (U, V, W).
(6)Disconnect the outdoor electronic control P.C. board
connectors:
CN661, CN663, CN681, CN791, CN792, CN793, CN796,
CN931, CN932
Disconnect the noise filter P.C. board connector:
CN912
(7)Remove the screws of the electrical parts, and remove the
electrical parts.
(8)Remove the propeller.
(9)Remove the screws of the separator, and remove the
separator.
(10)Remove the sound proof felt.
(11)Detach the welded parts of the compressor suction and discharge pipes (Photo 4).
(12)Remove the compressor nuts and remove the compressor.
Screws of
service
panel
Screws of
the front panel
Photo 2
Screws of the top panel
Screws of
the side panel
Photo 4
Screws of
the service panel
Screws of rear panel
Photo 3
Suction pipe
welded part
Discharge pipe
welded part
Screws of the electrical parts
63
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07.4.17 1:41 PM
Page 64
PHOTOS
OPERATING PROCEDURE
Photo 5
2. Removing the fan motor
(1)Remove the top panel, the service panel, and the front panel
(Photo 1, 2).
(2)Disconnect the connectors CN931 and CN932 on the outdoor
electronic control P.C. board.
(3)Remove the propeller.
(4)Remove the fan motor.
Screws of the outdoor fan motor
Propeller
Propeller
nut
Separator
Sound proof felt
Photo 6
3. Removing the 4-way valve
(1)Remove the top panel (Photo 1, 2).
(2)Remove the service panel, rear panel, and pipe cover
(Photo 1,2).
Recover refrigerant gas.
(3)Remove the electrical parts (Photo 3).
(4)Detach the welded parts of 4-way valve and pipe.
4 way valve
R.V. coil
Welded parts
4. Removing the expansion valve
Photo 7
(1)Remove the top panel (Photo 1, 2).
(2)Remove the service panel (Photo 1, 2).
(Gas recovery is not required if the unit is pumped down.)
(3)Remove the front panel for removing LEV F (Photo 1).
(4)Remove the electrical parts for removing LEV F (Photo 3).
(5)Remove the LEV coils.
(6)Detach the welded parts of expansion valves and pipes.
LEV coil F
Expansion valve F
Expansion
valves
LEV coils
64
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07.4.17 1:41 PM
Page 65
OPERATING PROCEDURE
PHOTOS
5. Removing the reactor
Photo 8
(1)Remove the top panel (Photo 1, 2).
(2)Disconnect the reactor lead wire.
(3)Remove the screws of the reactor, and remove the reactor.
Screws of the reactor
65
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Page 66
PARTS LIST (non-RoHS compliant)
13
MXZ-2A20NA
13-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS
21
19
20
22
18
23
17
16
15
14
1
13
2
3
4
5 6 7 8
66
9
10
11
12
OB444B--3.qxp
07.4.17 1:41 PM
Page 67
PARTS LIST (non-RoHS compliant)
MXZ-2A20NA
13-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS
Part numbers that are circled are not shown in the illustration.
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Parts No.
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
939
817
939
B05
065
851
939
851
938
939
939
939
939
939
B05
939
938
819
819
A56
819
939
B05
939
A49
938
939
938
B05
232
009
521
900
506
640
493
640
493
290
666
667
233
245
661
662
959
640
493
961
297
523
630
515
641
937
936
936
299
Parts Name
CABINET
HANDLE
GRILLE
COMPRESSOR
COMPRESSOR RUBBER SET
EXPANSION VALVE
LEV COIL
EXPANSION VALVE
LEV COIL
BASE
UNION(GAS)
UNION(LIQUID)
BACK PANEL
SERVICE PANEL
BALL VALVE (GAS)
BALL VALVE (LIQUID)
POWER RECEIVER
EXPANSION VALVE
LEV COIL
4-WAY VALVE
TOP PANEL
REAR GUARD
HEAT EXCHANGER
MOTOR SUPPORT
SERVICE PORT
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
OIL SEPARATOR
Symbol
in Wiring
Diagram
MC
LEV B
LEV A
LEV E
67
Q'ty/unit
Remarks
MXZ-2A20NA
1
1
1
1
3
1
1
1
1
1
2
2
1
1
1
1
1
1
1
1
1
1
1
1
2
8
2
1
1
SNB130FPDH1
3RUBBERS SET
B room
B room
A room
A room
[3/8
[1/4
[5/8
[3/8
E
O.D.0.14OI.D.0.09O19.68
O.D.0.16OI.D.0.11O3.93
O.D.0.98OI.D.0.02O39.37
OB444B--3.qxp
07.4.17 1:41 PM
Page 68
PARTS LIST (non-RoHS compliant)
MXZ-2A20NA
13-2. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS
12
11
10
9
8
1
2
3
4
5
68
6
7
OB444B--3.qxp
07.4.17 1:41 PM
Page 69
PARTS LIST (non-RoHS compliant)
MXZ-2A20NA
13-2. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS
No.
1
2
3
4
5
6
7
8
9
10
11
12
Parts No.
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
851
A58
B05
B05
B05
927
A53
977
B05
938
938
938
501
301
440
450
444
374
374
307
490
308
309
337
Parts Name
Symbol
in Wiring
Diagram
PROPELLER
MF
OUTDOOR FAN MOTOR
POWER BOARD
ELECTRONIC CONTROL P.C. BOARD
NOISE FILTER P.C. BOARD
TB2,3
TERMINAL BLOCK
TB1
TERMINAL BLOCK
GAS PIPE TEMPERATURE THERMISTOR SET RT6A,B
21S4
R.V. COIL
RT61,62,68
THERMISTOR SET
AMBIENT TEMPERATURE THERMISTOR RT65
L
REACTOR
69
Q'ty/unit
MXZ-2A20NA
1
1
1
1
1
2
1
1
1
1
1
1
Remarks
RC0J60Including heat sink and RT64
Indoor unit connecting
Power supply
DEFROST, DISCHARGE
OUTDOOR HEAT EXCHANGER
20A 600µH
OB444B--3.qxp
07.4.17 1:41 PM
Page 70
PARTS LIST (non-RoHS compliant)
MXZ-3A30NA
13-3. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS
24
23
22
21
20
25
19
18
17
16
15
14
13
12
1
2
11
5
6
7 8 9
10
3
4
70
OB444B--3.qxp
07.4.17 1:41 PM
Page 71
PARTS LIST (non-RoHS compliant)
MXZ-3A30NA
13-3. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS
Part numbers that are circled are not shown in the illustration.
No.
Parts No.
1
2
3
4
5
6
M21 TK0 232
M21 TK0 027
M21 TK5 010
M21 TK0 245
T92 500 801
T2W TK0 505
R01 E39 401
T2W TK0 653
R01 E39 401
T2W TK0 652
R01 E39 401
T2W TK0 651
M21 TK0 290
M21 42E 644
T2W TK0 247
M21 TK5 667
T2W J7E 667
M21 J7E 248
T2W TK0 959
T2W J7E 961
M21 NT1 646
T2W WW8 401
T2W TK0 651
M21 TK0 297
T2W E40 523
M21 J7E 630
M21 TK0 249
M21 J7E 641
M21 SJ4 937
M21 TK0 936
T2W E59 936
T2W J7E 656
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Parts Name
FRONT PANEL
HANDLE ASSEMBLY
GRILLE
SERVICE PANEL
COMPRESSOR
COMPRESSOR RUBBER SET
EXPANSION VALVE
LEV COIL
EXPANSION VALVE
LEV COIL
EXPANSION VALVE
LEV COIL
BASE ASSEMBLY
UNION
PIPE COVER
BALL VALVE (LIQUID) 3/8
BALL VALVE (GAS) 5/8
REAR PANEL
POWER RECEIVER
4-WAY VALVE
HIGH PRESSURE SWITCH
EXPANSION VALVE
LEV COIL
TOP PANEL
REAR GUARD
HEAT EXCHANGER
SIDE PANEL
SERVICE PORT
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
OIL SEPARATOR
Symbol
in Wiring
Diagram
MC
LEV C
LEV B
LEV A
HPS
LEV E
71
Q'ty/unit
MXZ-3A30NA
1
2
1
1
1
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
3
1
1
Remarks
TNB220FMCH
3RUBBERS SET
C room
C room
B room
B room
A room
A room
[1/2,[3/8,[1/4 SET
[3/8
[5/8
4.8MPa(48.9kg/cm2)
E
O.D.0.16OI.D.0.09O15.75
O.D.0.16OI.D.0.11O3.54
O.D.0.10OI.D.0.02O39.37
OB444B--3.qxp
07.4.17 1:41 PM
Page 72
PARTS LIST (non-RoHS compliant)
MXZ-3A30NA
13-4. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS
12
11
10
9
8
7
1
2
3
4
72
5
6
OB444B--3.qxp
07.4.17 1:41 PM
Page 73
PARTS LIST (non-RoHS compliant)
MXZ-3A30NA
13-4. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS
No.
1
2
3
4
5
6
7
8
9
10
11
12
Parts No.
M21
T2W
T2W
T2W
M21
T2W
T2W
T2W
T2W
T2W
M21
M21
TK0
J7E
J7E
J7E
TK0
J7E
YH1
J7E
E88
J7E
G0H
90V
501
301
440
451
337
424
376
376
307
398
308
309
Parts Name
Symbol
in Wiring
Diagram
PROPELLER
MF
OUTDOOR FAN MOTOR
POWER BOARD
ELECTRONIC CONTROL P.C. BOARD
REACTOR
L
NOISE FILTER P.C. BOARD
TERMINAL BLOCK
TB2~4
TERMINAL BLOCK
TB1
GAS PIPE TEMPERATURE THERMISTOR RT6A,B,C
R.V. COIL
21S4
THERMISTOR SET
RT61,62,68
AMBIENT TEMPERATURE THERMISTOR RT65
73
Q'ty/unit
MXZ-3A30NA
1
1
1
1
1
1
3
1
1
1
1
1
Remarks
RC0J60Including heat sink and RT64
20A 600µH
Indoor unit connecting
Power supply
DEFROST, DISCHARGE,
OUTDOOR HEAT EXCHANGER
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Page 74
RoHS PARTS LIST (RoHS compliant)
14
MXZ-2A20NA MXZ-2A20NA - 1
14-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS
21
19
20
22
18
23
17
16
15
14
1
13
2
3
4
5 6 7 8
74
9
10
11
12
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07.4.17 1:41 PM
Page 75
PARTS LIST (RoHS compliant)
MXZ-2A20NA MXZ-2A20NA - 1
14-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS
No.
RoHS
Part numbers that are circled are not shown in the illustration.
Parts No.
1 G E12 939
2 G E12 817
3 G E12 939
G E12 B05
4
G E12 C15
5 G E12 065
G E12 851
6
G E12 939
G E12 851
7
G E12 938
8 G E12 939
G E12 C06
9
G E12 C18
G E12 C06
10
G E12 C18
11 G E12 939
12 G E12 939
13 G E12 C15
14 G E12 C06
G E12 938
15
G E12 C18
16 G E12 853
17 G E12 819
18 G E12 A56
19 G E12 819
20 G E12 939
21 G E12 B05
22 G E12 939
23 G E12 A49
24 G E12 938
25 G E12 939
26 G E12 938
27 G E12 B05
232
009
521
900
900
506
640
493
640
493
290
666
666
667
667
233
245
661
662
959
959
640
493
961
297
523
630
515
641
937
936
936
299
Parts Name
Symbol
in Wiring
Diagram
CABINET
HANDLE
GRILLE
COMPRESSOR
COMPRESSOR
COMPRESSOR RUBBER SET
EXPANSION VALVE
LEV COIL
EXPANSION VALVE
LEV COIL
BASE
UNION(GAS)
UNION(GAS)
UNION(LIQUID)
UNION(LIQUID)
BACK PANEL
SERVICE PANEL
BALL VALVE (GAS)
BALL VALVE (LIQUID)
POWER RECEIVER
POWER RECEIVER
EXPANSION VALVE
LEV COIL
4-WAY VALVE
TOP PANEL
REAR GUARD
HEAT EXCHANGER
MOTOR SUPPORT
SERVICE PORT
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
OIL SEPARATOR
MC
MC
LEV B
LEV A
Q'ty/unit
MXZ2A20NA
1
1
1
1
3
1
1
1
1
1
2
MXZ2A20NA 1
1
1
1
3
1
1
1
1
1
2
2
1
1
1
1
1
LEV E
75
1
1
1
1
1
1
1
2
8
2
1
1
Remarks
1
2
1
1
1
1
1
1
1
1
1
1
1
1
2
8
2
1
1
SNB130FPDH1
SNB130FQBH1
3RUBBERS SET
B room
B room
A room
A room
[3/8
[3/8
[1/4
[1/4
[5/8
[3/8
E
O.D.0.14OI.D.0.09O19.68
O.D.0.16OI.D.0.11O3.93
O.D.0.98OI.D.0.02O39.37
OB444B--3.qxp
07.4.17 1:41 PM
Page 76
RoHS PARTS LIST (RoHS compliant)
MXZ-2A20NA MXZ-2A20NA - 1
14-2. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS
12
11
10
9
8
1
2
3
4
5
76
6
7
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07.4.17 1:41 PM
Page 77
PARTS LIST (RoHS compliant)
No.
RoHS
MXZ-2A20NA MXZ-2A20NA - 1
14-2. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS
Parts No.
1 G E12
2 G E12
G E12
3
G E12
G E12
4
G E12
5 G E12
6 G E12
7 G E12
8 G E12
9 G E12
10 G E12
11 G E12
12 G E12
851
A58
B05
C15
B05
C15
B05
927
A53
977
B05
938
938
938
501
301
440
440
450
450
444
374
374
307
490
308
309
337
Symbol
in Wiring
Diagram
Parts Name
PROPELLER
MF
OUTDOOR FAN MOTOR
POWER BOARD
POWER BOARD
ELECTRONIC CONTROL P.C. BOARD
ELECTRONIC CONTROL P.C. BOARD
NOISE FILTER P.C. BOARD
TB2,3
TERMINAL BLOCK
TB1
TERMINAL BLOCK
GAS PIPE TEMPERATURE THERMISTOR SET RT6A,B
21S4
R.V. COIL
RT61,62,68
THERMISTOR SET
AMBIENT TEMPERATURE THERMISTOR RT65
L
REACTOR
77
Q'ty/unit
MXZ2A20NA
1
1
1
MXZ2A20NA -
Remarks
1
1
1
RC0J60-
1
Including heat sink and RT64
Including heat sink and RT64
1
1
2
1
1
1
1
1
1
1
1
2
1
1
1
1
1
Indoor unit connecting
Power supply
DEFROST, DISCHARGE
OUTDOOR HEAT EXCHANGER
20A 600µH
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07.4.17 1:41 PM
Page 78
RoHS PARTS LIST (RoHS compliant)
MXZ-3A30NA
14-3. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS
24
23
22
21
20
25
19
18
17
16
15
14
13
12
1
2
11
5
6
7 8 9
10
3
4
78
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07.4.17 1:41 PM
Page 79
PARTS LIST (RoHS compliant)
MXZ-3A30NA
14-3. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
RoHS
Part numbers that are circled are not shown in the illustration.
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
Parts No.
M21
M21
M21
M21
T92
M21
M21
M21
M21
M21
M21
M21
M21
M21
M21
M21
T2W
T2W
T2W
T2W
M21
M21
M21
M21
M21
T2W
M21
T2W
M21
M21
M21
T2W
L2V
L2V
L2V
L2V
505
L2V
L2V
L2V
L2V
L2V
L2V
L2V
L2V
L2V
L2V
L2V
L7V
L7V
L7V
L7V
L2V
L2V
L2V
L2V
L2V
L7V
L2V
L7V
L2V
L2V
L2V
L7V
232
027
010
245
801
505
401
653
401
652
401
651
290
644
247
667
668
248
959
642
646
402
651
297
523
630
249
641
937
936
938
656
Symbol
in Wiring
Diagram
Parts Name
FRONT PANEL
HANDLE ASSEMBLY
GRILLE
SERVICE PANEL
COMPRESSOR
COMPRESSOR RUBBER SET
EXPANSION VALVE
LEV COIL
EXPANSION VALVE
LEV COIL
EXPANSION VALVE
LEV COIL
BASE ASSEMBLY
UNION
PIPE COVER
BALL VALVE (LIQUID) 3/8
BALL VALVE (GAS) 5/8
REAR PANEL
POWER RECEIVER
4-WAY VALVE
HIGH PRESSURE SWITCH
EXPANSION VALVE
LEV COIL
TOP PANEL
REAR GUARD
HEAT EXCHANGER
SIDE PANEL
SERVICE PORT
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
OIL SEPARATOR
MC
LEV C
LEV B
LEV A
HPS
LEV E
79
Q'ty/unit
MXZ-3A30NA
1
2
1
1
1
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
3
1
1
Remarks
TNB220FMCH
3RUBBERS SET
C room
C room
B room
B room
A room
A room
[1/2,[3/8,[1/4 SET
[3/8
[5/8
4.8MPa(48.9kg/cm2)
E
O.D.0.16OI.D.0.09O15.75
O.D.0.16OI.D.0.11O3.54
O.D.0.10OI.D.0.02O39.37
OB444B--3.qxp
07.4.17 1:41 PM
Page 80
RoHS PARTS LIST (RoHS compliant)
MXZ-3A30NA
14-4. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS
12
11
10
9
8
7
1
2
3
4
80
5
6
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Page 81
PARTS LIST (RoHS compliant)
No.
RoHS
MXZ-3A30NA
14-4. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS
1
2
3
4
5
6
7
8
9
10
11
12
G
G
G
G
G
G
G
G
G
G
G
G
Parts No.
M21
T2W
T2W
T2W
M21
T2W
T2W
T2W
M21
T2W
M21
M21
L2V
L7V
L7V
L7V
L2V
L7V
L2V
L7V
L7V
L7V
L2V
L2V
501
301
440
451
337
424
376
377
307
398
308
309
Symbol
in Wiring
Diagram
Parts Name
PROPELLER
MF
OUTDOOR FAN MOTOR
POWER BOARD
ELECTRONIC CONTROL P.C. BOARD
REACTOR
L
NOISE FILTER P.C. BOARD
TERMINAL BLOCK
TB2~4
TERMINAL BLOCK
TB1
GAS PIPE TEMPERATURE THERMISTOR RT6A,B,C
R.V. COIL
21S4
THERMISTOR SET
RT61,62,68
AMBIENT TEMPERATURE THERMISTOR RT65
81
Q'ty/unit
MXZ-3A30NA
1
1
1
1
1
1
3
1
1
1
1
1
Remarks
RC0J60Including heat sink and RT64
20A 600µH
Indoor unit connecting
Power supply
DEFROST, DISCHARGE,
OUTDOOR HEAT EXCHANGER
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Page 82
RoHS PARTS LIST (RoHS compliant)
MXZ-3A30NA - 1
14-5. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS
21
19
20
18
17
15
22
14
16
13
23
1
2
12
5 6
11
7 8
2
9
10
3
4
82
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Page 83
RoHS PARTS LIST (RoHS compliant)
MXZ-3A30NA - 1
14-5. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
RoHS
Part numbers that are circled are not shown in the illustration.
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
Parts No.
M21
M21
M21
M21
T92
M21
M21
M21
M21
M21
M21
M21
M21
M21
M21
M21
M21
T2W
M21
M21
M21
M21
M21
T2W
M21
T2W
T2W
M21
M21
M21
T2W
0A2
0A2
L2V
0A2
505
L2V
L2V
L2V
L2V
L2V
L2V
L2V
0A2
0A2
0A2
0A6
0A2
L7V
L2V
L2V
0A2
L2V
0A2
0A6
L2V
L7V
L7V
0A2
0A2
L2V
L7V
232
027
010
245
801
505
401
653
401
652
401
651
290
644
668
667
248
642
646
402
652
297
523
630
249
641
959
937
936
938
656
Parts Name
FRONT PANEL
HANDLE ASSEMBLY
GRILLE
SERVICE PANEL
COMPRESSOR
COMPRESSOR RUBBER SET
EXPANSION VALVE
LEV COIL
EXPANSION VALVE
LEV COIL
EXPANSION VALVE
LEV COIL
BASE ASSEMBLY
UNION
STOP VALVE (LIQUID) 3/8
STOP VALVE (GAS) 5/8
REAR PANEL
4-WAY VALVE
HIGH PRESSURE SWITCH
EXPANSION VALVE
LEV COIL
TOP PANEL
REAR GUARD
HEAT EXCHANGER
SIDE PANEL
SERVICE PORT
POWER RECEIVER
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
OIL SEPARATOR
Symbol
in Wiring
Diagram
MC
LEV C
LEV B
LEV A
HPS
LEV F
83
Q'ty/unit
MXZ-3A30NA 1
2
1
1
1
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
2
3
1
1
1
Remarks
TNB220FMCH
3RUBBERS SET
C room
C room
B room
B room
A room
A room
[1/2,[3/8,[1/4 SET
[3/8
[5/8
4.8MPa(48.9kg/cm2)
F
O.D.0.12OI.D.0.08O11.8
O.D.0.16OI.D.0.11O3.94
O.D.0.10OI.D.0.02O39.37
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Page 84
RoHS PARTS LIST (RoHS compliant)
MXZ-3A30NA - 1
14-6. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS
11
10
9
8
7
1
2
3
84
4
5
6
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Page 85
RoHS PARTS LIST (RoHS compliant)
MXZ-3A30NA - 1
14-6. OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS
No.
RoHS
Part numbers that are circled are not shown in the illustration.
1
2
3
4
5
6
7
8
9
10
11
G
G
G
G
G
G
G
G
G
G
G
Parts No.
M21
T2W
M21
T2W
M21
M21
T2W
T2W
T2W
M21
M21
L2V
L7V
0A1
0A6
L2V
0A0
0A2
L7V
L7V
L2V
0A2
501
301
440
451
337
424
376
377
398
308
309
Parts Name
Symbol
in Wiring
Diagram
PROPELLER
MF
OUTDOOR FAN MOTOR
POWER BOARD
ELECTRONIC CONTROL P.C. BOARD
REACTOR
L
NOISE FILTER P.C. BOARD
TERMINAL BLOCK
TB2~4
TERMINAL BLOCK
TB1
R.V. COIL
21S4
THERMISTOR SET
RT61,62,68
AMBIENT TEMPERATURE THERMISTOR RT65
85
Q'ty/unit
MXZ-3A30NA 1
1
1
1
1
1
3
1
1
1
1
1
Remarks
PM8H60Including heat sink and RT64
20A 600µH
Indoor unit connecting
Power supply
DEFROST, DISCHARGE,
OUTDOOR HEAT EXCHANGER
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15
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Page 86
OPTIONAL PARTS
15-1. Different-diameter pipe
MXZ-2A20NA
MXZ-2A20NA MXZ-3A30NA
MXZ-3A30NA -
Unit : inch
1
Model name
Connected pipes
diameter
Length
A
Length
B
Length
C
MAC-A454JP
{3/8 — {1/2
{3/8
{1/2
2.72
MAC-A455JP
{1/2 — {3/8
{1/2
{3/8
2.56
MAC-A456JP
{1/2 — {5/8
{1/2
{5/8
2.62
PAC-493PI
{1/4 — {3/8
{1/4
{3/8
2.38
PAC-SG76RJ-E
{3/8 — {5/8
{3/8
{5/8
4
1
For differentdiameter
pipes
A
B
C
15-2. Outlet guide
Changes air discharge direction.
17-3/4"
Punched hole
5/32" - [1/4"
1-11/16"
Z
MAC-889SG
2-13/16"
1-5/32"
5-29/32"
4-5/16"
3/16" - [1/4"
Punched hole 2-1/32"
32-3/4"
16-3/8"
29-15/16"
1/4"
24-1/32"
21-1/32"
15-3/16"
Z-Z
15-3/16"
3/16" - [1/4"
Punched hole
21-1/32"
MAC-855SG
86
1-5/32"
51H-855
5/8"
MAC-855SG
Z
3-1/8"
1
506-889
12-7/8"
MXZ-3A30NA
MXZ-3A30NA -
MAC-889SG
21-5/32"
1
4-1/16"
MXZ-2A20NA
MXZ-2A20NA -
9/32"
20-5/8"
17/32"
1-7/8" 52.
5-
21-3/16"
9/32"
13/32x1-7/8"
Model name Model code
1/4"
Applied unit
Unit : inch
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87
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TM
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
C Copyright 2006 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD
Distributed in May 2007. No. OB444 REVISED EDITION-B 9
Distributed in Jun. 2006. No. OB444 REVISED EDITION-A 8
Distributed in Mar. 2006. No. OB444 8
Made in Japan
New publication, effective May 2007
Specifications subject to change without notice.