MITSUBISHI ELECTRIC MXZ-SM72TAM-U1 Residential Outdoor Unit Owner’s Manual

Refrigerant piping Liquid pipe

diameter

Gas pipe

in (mm) in (mm)

Fan*5

Type × Quantity

Airflow rate

m³/min L/s

cfm

Control, Driving mechanism

Motor output kW

External static press.

Compressor

Type × Quantity Manufacturer

Starting method

Motor output kW Case heater kW

Lubricant

External finish

External dimension H × W × D

mm

in

Protection devices

High pressure protection Inverter circuit (COMP./FAN)

Compressor

Fan motor

Refrigerant

Type × original charge

Control

Net weight

lb (kg)

Heat exchanger

HIC circuit (HIC: Heat Inter-Changer)

Defrosting method

Standard attachment

Document Accessory

Optional parts

Guaranteed

Cooling

operation range Heating

D.B. W.B.

Remarks

Non-Ducted Ducted Non-Ducted Ducted Non-Ducted Ducted

21.1

28.1

35.2

72,000

96,000

120,000

5.67

8.16

10.7

16.6-15.0

23.9-21.6

31.3-28.3

20.2

27

33.4

69,000

92,000

114,000

4.88

5.07

6.93

7.31

9.35

9.53

14.3-12.9 14.8-13.4 20.2-18.3 21.4-19.3 27.3-24.7 27.8-25.2

23.4

31.7

39.6

80,000

108,000

135,000

5.36

7.61

9.87

15.7-14.2

22.2-20.1

28.8-26.1

22.6

30.2

37.8

77,000

103,000

129,000

4.86

5.12

6.86

7.24

9.11

9.21

14.2-12.8 15.0-13.5 20.0-18.1 21.2-19.1 26.6-24.1 26.9-24.3

3-phase 3-wire 208-230V 60Hz

40/60

50/70

32/50

47/65

58/76

84/102

50 to 130% of outdoor unit cooling rated capacity

04 – 72 / 23

04 – 96 / 30

04 – 96 / 30

06 – 36 / 12

06 – 36 / 12

06 – 36 / 12

53/54

58/59

61/62

3/8 (9.52) *4

3/8 (9.52)

7/8 (22.2)

1-1/8 (28.58)

Propeller Fan × 2

149

169

208

2,480

2,820

3,470

5,260

5,965

7,345

DC control

0.285 + 0.285

0 in.WG (0 Pa) / 0.12 in.WG (30 Pa)

Scroll hermetic compressor× 1

Siam Compressor Industry Co., Ltd.

Inverter

4.1

5.3

7.0

0

FVC68D 101oz. (3.0L)

Galvanized Steel Sheet Munsell No. 3Y 7.8/1.1

1,662 × 1,050 × 460 (+45)

65-7/16 × 41-11/32 × 187/64 (+ 1-49/64)

High pressure switch

Overcurrent detection, Overheat detection (Heat sink thermistor)

Compressor thermistor, Overcurrent detection

Overheating, Voltage protection

R410A 9.3 kg

Linear expansion valve

432 (196)

Cross fin and copper tube

Double pipe heat exchanger

Reversed refrigerant circuit

Installation Manual

Joint pipe×1 set, Grounding lead wire ×1

Joint: CMY-Y62-G-E/CMY-Y62-GA-E, Header: CMY-Y64/68-G-E

-5 to 46°C [23 to 115°F]67*8

-20 to 15°C [-4 to 59°F]

*1. Nominal cooling conditions:

Indoor:

80°F D.B. /67 °F W.B. (26.7°C D.B./19.4°C W.B.)

Outdoor:

95°F D.B. (35.0°C D.B.)

*2. Nominal heating conditions:

Indoor:

70°F D.B. (21.1°C D.B.)

Outdoor:

47°F D.B./43°F W.B. (8.3°C D.B./6.1°C W.B.)

*3. It cannot be connected to mixed CITY MULTI indoor unit and branch box indoor unit.

*4. Liquid pipe diameter: 12.7mm, when further piping length is longer than 90m, and when PEFY-P72 or P96 is connected.

*5. It is possible to set the external static pressure to 30 Pa by Dip Switch.

6. 5 to 115°F D.B. (-15 to 46°C D.B.), when an optional Air Outlet Guide is installed. However, this condition does not apply to the indoor units listed in 7.

*7. 50 to 115°F (10 to 46°C) D.B.: When connecting PKFY-P06NBMU, PKFY-P08NHMU, PKFY-P04/06/08/12NLMU, PFFY-P06/08/12NEMU, and

PFFY-P06/08/12NRMU type indoor unit.

*8. When the temperature is below 50°F D.B. (10 °C D.B.) with branch box system, noise could potentially occur.

Notes:
· Nominal conditions 1, 2 are subject to AHRI 1230. · Due to continuing improvement, above specifications are subject to change without notice. · See the following for unit conversion: kcal/h = kW × 860, Btu/h = kW × 3,412, cfm = m³/min × 35.31, lb = kg × 0.4536
Above specification data is subject to rounding variation. · Refer to the indoor unit’s service manual for the indoor units specifications. · Details on foundation work, duct work, insulation work, electrical wiring, power source switch, and other items shall be referred to the Installation
Manual.

DATA

5-1. Selection of indoor and outdoor units
How to determine the capacity when less than or equal 100% indoor model size units are connected in total:
The purpose of this flow chart is to select the indoor and outdoor units. For other purposes, this flow chart is intended only for reference.
Determine the load (L) and the indoor/outdoor temperature.

Temporarily select the indoor/outdoor units. Reselect the indoor units Reselect the outdoor units

Indoor Unit

n

Total indoor units capacity (CTi) = (Individual nominal (rated) indoor unit capacity CTik ×
k=1

Individual indoor temperature correction coef. k) (Figure 1, 4)

n: Total number of indoor units k: Indoor unit number

Outdoor Unit
Outdoor unit capacity (CTo) = Nominal outdoor unit capacity × Outdoor temperature correction coef. (Figure 2, 5) × Piping length correction coef. (Figure 3, 6) × Defrost correction coef.
(In heating operation, Table 1)

CTo CTi Yes

(If indoor to outdoor connectable capacity ratio is less than 100%, the capacity correction is set as 100% )
No

Maximum capacity (CTmax) = CTo

No L CTo

Yes

Want to change to

Yes

smaller indoor units?

No

CTik × k

Individual indoor unit capacity: CTik = CTmax ×

n
(CTim × m)

m=1

Maximum capacity (CTmax) = CTi

No L CTi

Yes

Need to select smaller

Yes

outdoor units?

No

Does it fulfill the load of

No

each room?

Yes

Capacity Determination

Does it fulfill the load of

No

each room?

Yes Selecting units is completed.

Selecting units is completed.

ck: Outdoor unit power input coef. of k indoor unit room temp. (Refer to 4-2.)
Mk: Number part of the k indoor unit model (e.g. P80 80)

Average indoor temp. power input Coef. (Cave)

n

n

Cave

=

k=1

{C k

×

(Mk/ Mk)}
k=1

Average indoor temp. power input Coef. (Cave)

n

n

Cave

=

k=1

{C k

×

(Mk/ Mk)}
k=1

Input Calculation

OCH800A_13

Outdoor unit input = Nominal outdoor unit input × Cave

Outdoor unit input = Nominal outdoor unit input × Cave × (CTi)
(x) is the approximate correction function when less than or equal 100% model size units are input as connected.

How to determine the capacity when greater than 100% indoor model size units are connected in total
The purpose of this flow chart is to select the indoor and outdoor units. For other purposes, this flow chart is intended only for reference.
Determine the load (L) and the indoor/outdoor temperature.

Temporarily select the indoor/outdoor units. Reselect the indoor units Reselect the outdoor units

Indoor Unit

n

Total indoor units capacity (CTi) = (Individual nominal (rated) indoor unit capacity CTik ×
k=1

Individual indoor temperature correction coef. k) (Figure 1, 4)

n: Total number of indoor units k: Indoor unit number

Outdoor Unit Outdoor unit capacity (CTo) = Nominal outdoor unit capacity × G (CTi)
Outdoor temperature correction coef. (Figure 2, 5) × Piping length correction coef. (Figure 3, 6) × Defrost correction coef. (In heating operation, Table 1)
G (x) is the approximate correction function when greater than 100% model size units are connected. G (x) refers to “Standard capacity diagram”.
No CTo CTi
Yes
Maximum capacity (CTmax) = CTo

No L CTo

Yes

Want to change to

Yes

smaller indoor units?

No

CTik × k

Individual indoor unit capacity: CTik = CTmax ×

n
(CTim × m)

m=1

Capacity Determination

Maximum capacity (CTmax) = CTi

No L CTi

Yes

Need to select smaller

Yes

outdoor units?

No

Does it fulfill the load of

No

each room?

Yes

Selecting units is completed.

Does it fulfill the load of

No

each room?

Nominal outdoor unit capacity

No

< Total indoor units capacity

Yes

Yes
Selecting units is completed. ck: Outdoor unit power input coef. of k indoor unit room temp. (Refer to 4-2.) Mk: Number part of the k indoor unit model (e.g. P80 80)

Outdoor unit input = Nominal outdoor unit input ×
Outdoor temperature correction coef. × (CTi )
(x) is the approximate correction function when less than or equal 100% model size units are input as connected.

Average indoor temp. power input Coef. (Cave)

n

n

Cave

=

k=1

{C k

×

(Mk/ Mk)}
k=1

Average indoor temp. power input Coef. (Cave)

n

n

Cave

=

k=1

{C k

×

(Mk/ Mk)}
k=1

Input Calculation

Outdoor unit input = Nominal outdoor unit input × Cave × F (CTi)

Outdoor unit input = Nominal outdoor unit input × Cave × F (CTi)

F (x) is the approximate correction function when greater than 100% model size units are input as connected.

OCH800A_14

5-1-1. Cooling

Design condition Outdoor dry bulb temperature Total cooling load Room 1 Indoor dry bulb temperature
Indoor wet bulb temperature Cooling load Room 2 Indoor dry bulb temperature Indoor wet bulb temperature

Other

Cooling load Indoor/Outdoor piping equivalent length

98.6ºF (37.0ºC) 60.6 kBtu/h 80.6ºF (27.0ºC) 64.4ºF (20.0ºC) 27.2 kBtu/h 75.2ºF (24.0ºC) 64.4ºF (19.0ºC)
33.4 kBtu/h 196 ft

Capacity of indoor unit
Model class of indoor unit 04 05 06 08 12 15 18 24 27 30 36 48 54 72 96 Model capacity (kBtu/h) 4.0 5.0 6.0 8.0 12.0 15.0 18.0 24.0 27.0 30.0 36.0 48.0 54.0 72.0 96.0

Model name

06

SVZ

–

SLZ-KF

–

SEZ-KD

–

MFZ-KJ

–

MLZ-KP

–

MSZ-FH

6.0

MSZ-FS

6.0

MSZ-GL

6.0

MSZ-EF

–

PEAD

–

PLA

–

Capacity class

09

12

15

18

24

30

36

–

12.0

–

18.0 24.0 30.0 36.0

8.4 11.1 15.0

–

–

–

–

8.1 11.5 14.1 17.2

–

–

–

9.0 12.0 15.0 17.0

–

–

–

9.0 12.0

–

17.2

–

–

–

9.0 12.0 15.0 17.2

–

–

–

9.0 12.0 15.0 17.2

–

–

–

9.0 12.0 14.0 17.2 22.5

–

–

9.0 12.0 15.0 18.0

–

–

–

9.0 12.0 15.0 18.0 24.0 30.0 36.0

–

12.0

–

18.0 24.0 30.0 36.0

OCH800A_15

Cooling calculation

· Tentative selection of indoor units

Room1: PEFY-P30

30.0 kBtu/h (Nominal)

Room2: PEFY-P36

36.0 kBtu/h (Nominal)

In this case, the total capacity is 66.0. (30.0 + 36.0 = 66.0)

· Tentative selection of outdoor unit

Proper outdoor unit in this case is SM72TAM as the total capacity of the indoor units is 66.0.

SM72TAM

72.0 kBtu/h (Nominal)

· Calculation for the corrected capacity of the total indoor units (CTi)

Correction factor for indoor design wet bulb temperature: Room 1 (68.0°F) 1.02 (Refer to Figure 1 in 5-2-1.)

Room 2 (66.2°F) 0.95 (Refer to Figure 1 in 5-2-1.)

CTi = (Rated capacity of indoor unit × Correction factor for indoor temperature)

= 30.0 × 1.02 + 36.0 × 0.95

= 64.8 kBtu/h

· Calculation for the corrected capacity of the outdoor unit (CTo)

Correction factor for outdoor temperature (95.0°F)

1.00 (Refer to Figure 2 in 5-2-1.)

Correction factor for piping length (196 ft)

0.93 (Refer to Figure 5 in 5-5-1.)

CTo = Rated capacity of outdoor unit × Correction factor for outdoor temperature × Correction factor for piping length ×

G(CTi)*1

= 72.0 × 1.00 × 0.93

= 66.96 kBtu/h

*1. G(CTi) is used only when greater than 100% indoor model size are connected in total. Refer to Standard capacity diagram.
· Determination of maximum system capacity (CTx) Comparison between CTi and CTo: CTi = 64.8 < CTo = 66.96, thus, select CTi. CTx = CTi = 64.8 kBtu/h
· Comparison with essential load Against the essential load 60.6 kW, the maximum system capacity is 64.8 kW: A proper outdoor unit is selected.
· Calculation for the maximum indoor unit capacity of each room When CTx = CTi, use the calculation formula below. Room1: Rated capacity of indoor unit × Correction factor for indoor design temperature = 30.0 × 1.02 = 30.6 kBtu/h The capacity is enough for the cooling load of Room 1 (27.2 kBtu/h): A proper indoor unit is selected. Room2: CTx × Indoor unit rating × Correction factor for indoor design temperature = 36.0 × 0.95

= 34.2 kBtu/h The capacity is enough for the cooling load of Room 2 (33.4 kBtu/h): A proper indoor unit is selected.
Note: · Go on to the selection of units for heating after the selection for cooling has successfully completed. If failed, try again until proper units are selected.

5-1-2. Heating

Design condition

Outdoor wet bulb temperature

Total heating load

Room 1 Indoor dry bulb temperature

Heating load

Room 2 Indoor dry bulb temperature

Heating load

Other

Indoor/Outdoor piping equivalent length

35.6ºF (2.0ºC) 67.5 kBtu/h 69.8ºF (21.0ºC) 32.2 kBtu/h 73.4ºF (23.0ºC) 35.3 kBtu/h 196 ft

Capacity of indoor unit
Model class of indoor unit 04 05 06 08 12 15 18 24 27 30 36 48 54 72 96 Model capacity (kBtu/h) 4.5 5.6 6.7 9.0 13.5 17.0 20.0 27.0 30.0 34.0 40.0 54.0 60.0 80.0 108.0

Model name

Capacity class

06

09

12

15

18

24

30

36

SVZ

–

–

12.0

–

18.0 27.0 34.0 40.0

SLZ-KF

–

10.2 13.7 17.1

–

–

–

–

SEZ-KD

–

10.9 13.6 18.0 17.2

–

–

–

MFZ-KJ

–

10.9 13.0 18.0 21.0

–

–

–

MLZ-KP

–

10.9 13.0

–

21.0

–

–

–

MSZ-FH

6.0 10.9 13.6 18.0 20.3

–

–

–

MSZ-FS

6.0 10.9 13.6 18.0 20.3

–

–

–

MSZ-GL

6.0 10.9 14.4 18.0 21.6 27.6

–

–

MSZ-EF

–

10.9 13.0 18.0 21.0

–

–

–

PEAD

–

10.9 13.5 15.7 18.0 26.0 34.0 40.0

PLA

–

–

13.5

–

18.0 26.0 34.0 40.0

Heating calculation

· Tentative selection of indoor units

Room1: PEFY-P30

34.0 kBtu/h (Nominal)

Room2: PEFY-P36

40.0 kBtu/h (Nominal)

In this case, the total capacity is 74.0. (34.0 + 40.0 = 74.0)

· Tentative selection of outdoor unit

Proper outdoor unit in this case is SM72TAM as the total capacity of the indoor units is 74.0.

SM72TAM

80.0 kBtu/h

· Calculation for the corrected capacity of the total indoor units (CTi)

Correction factor for indoor temperature: Room 1 (69.8°F)

1.00 (Refer to Figure 3 in 5-2-2.)

Room 2 (73.4°F)

0.92 (Refer to Figure 3 in 5-2-2.)

CTi = (Rated capacity of indoor unit × Correction factor for indoor temperature)

= 34.0 × 1.00 + 40.0 × 0.92

= 70.8 kW

· Calculation for the corrected capacity of the outdoor unit (CTo)

Correction factor for outdoor temperature (35.6°F WB)

1.00 (Refer to Figure 4 in 5-2-2.)

Correction factor for piping length (196 ft)

0.96 (Refer to Figure 8 in 5-5-2.)

Correction factor for defrosting

0.89 (Refer to Table 1.)

CTo = Rated capacity of outdoor unit × Correction factor for outdoor temperature × Correction factor for piping length ×

Correction factor for defrosting (× G(CTi))*1

= 80.0 × 1.00 × 0.96 × 0.89

= 68.35 kBtu/h

*1. G(CTi) is used only when greater than 100% indoor model size are connected in total. Refer to Standard capacity diagram.

OCH800A_16

Table 1 Table of correction factor for frosting and defrosting

Outdoor inlet air temp. [°F (°C) W.B.] 43(6) 37(4) 36(2) 32(0) 28(-2)

Correction factor

1.00 0.98 0.89 0.88 0.89

· Determination of maximum system capacity (CTx) Comparison between CTi and CTo: CTi = 70.8 > CTo = 68.35, thus, select CTo. CTx = CTo = 68.35 kBtu/h

25(-4) 0.90

21(-6) 0.95

18(-8) 14(-10) 5(-15) 0.95 0.95 0.95

-4(-20) -13(-25) 0.95 0.95

· Comparison with essential load Against the essential load 67.5 kBtu/h, the maximum system capacity is 68.35 kBtu/h: Proper indoor units have been selected.
· Calculation for the maximum indoor unit capacity of each room When CTx = CTo, use the calculation formula below. Room1: CTx × Corrected capacity for Room1/CTi = 68.35 × (34.0 × 1.00)/70.8 = 32.8 kBtu/h The capacity is enough for the heating load of Room 1 (32.2 kW): A proper indoor unit is selected. Room2: CTx × Corrected capacity for Room1/CTi = 68.35 × (40.0 × 0.92)/(70.8) = 35.5 kW The capacity is enough for the heating load of Room 2 (35.3 kW): A proper indoor unit is selected.
Note: · The selection of units is completed when proper units are selected.

OCH800A_17

5-1-3. Power input of outdoor unit
· Outdoor unit: MXZ-SM72TAM · Indoor unit 1: PEFY-P30
Indoor unit 2: PEFY-P36

Cooling

· Nominal power input of outdoor unit

5.67 kW

· Calculation of the average indoor temperature power input coefficient

– Coefficient of the outdoor unit for indoor unit 1

(Outdoor temp. 98.6°F [37.0°C] D.B., Indoor temp. 64.4°F [18.0°C] W.B.)

0.93 (Refer to Figure 2 in 5-2-1)

– Coefficient of the outdoor unit for indoor unit 2

(Outdoor temp. 98.6°F [37.0°C] D.B., Indoor temp. 64.4°F [18.0°C] W.B.)

0.93 (Refer to Figure 2 in 5-2-1.)

n

n

– Average indoor temp. power input coefficient (Cave) =

{Ck × (Mk/ Mk)}

k=1

k=1

n: Total number of the indoor units

k: Number of the indoor unit

ck: Outdoor unit power input coefficient of k indoor unit room temp.

Mk: Number part of the k indoor unit model (e.g. P80: 80)

– Correction Coefficient of Indoor temperature = 0.93 × 30/(30 + 36) + 0.93 × 36/(30 + 36)

= 0.93

· Coefficient of the partial load (CTi)

Total indoor units capacity = 30 + 36 = 66, thus, (CTi) = 0.89 (Refer to the tables in 5-4. “Standard Capacity Dia-

gram”.)

· Outdoor power input (PIo)

Maximum System Capacity (CTx) = Total outdoor unit capacity (CTo), so use the following formula:

PIo = Outdoor unit cooling nominal power input × Correction coefficient of indoor temperature × (CTi)

= 5.67 × 0.93 × 0.89

= 4.69 kW

Heating

· Nominal power input of outdoor unit

5.36 kW

· Calculation of the average indoor temperature power input coefficient

– Coefficient of the outdoor unit for indoor unit 1 (Outdoor temp. 35.6°F [2.0°C] W.B., Indoor temp. 69.8°F [21.0°C]

D.B.)

1.20 (Refer to Figure 4 in 5-2-2.)

– Coefficient of the outdoor unit for indoor unit 2 (Outdoor temp. 35.6°F [2.0°C] W.B., Indoor temp. 73.4°F [23.0°C]

D.B.)

1.04 (Refer to Figure 4 in 5-2-2.)

n

n

–

Average

indoor

temp.

power

input

coefficient

(Cave)

=

{Ck
k=1

×

(Mk/ Mk)} k=1

n: Total number of the indoor units

k: Number of the indoor unit

ck: Outdoor unit power input coefficient of k indoor unit room temp.

Mk: Number part of the k indoor unit model (e.g. P80: 80)

– Correction Coefficient of Indoor temperature = 1.20 × 30/(30 + 36) + 1.04 × 36/(30 + 36)

= 1.11

· Coefficient of the partial load (CTi)

Total indoor units capacity = 30 + 36 = 66, thus, (CTi) = 0.9 (Refer to the tables in 5-4. “Standard capacity diagram”.)

· Outdoor power input (PIo)

Maximum System Capacity (CTx) = Total Indoor unit capacity (CTi), so use the following formula

PIo = Outdoor unit heating nominal power input × Correction coefficient of indoor temperature × (CTi)

= 5.36 × 1.11 × 0.9

= 5.35 kW

5-2. Correction by temperature
The outdoor units have varied capacity at different designing temperature. With the nominal cooling/heating capacity value and the ratio below, the capacity can be observed at various temperature.

5-2-1. Cooling
1.2

Correction factor of cooling capacity

1.0

0.8

0.6

0.459 15

60.8 62.6 64.4 66.2 68 69.8 71.6 73.4 75.2 [°FW.B.] 16 17 18 19 20 21 22 23 24 [°CW.B.] Indoor Temperature

<Figure 1> Indoor unit temperature correction

Correction factor of cooling capacity

1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 5
-15
1.2
1.0

Indoor Temperature 67.0°F (19.4°C) W.B.

14

23

32

41

50

59

68

77

-10

-5

0

5

10

15

20

25

Outdoor Temperature

68.0°F (20.0°C) W.B. 75.2°F (24.0°C) W.B. 72.0°F (22.0°C) W.B.

86

95

104

113 [°F D.B.]

30

35

40

45 [°C D.B.]

Indoor Temperature

0.8

0.6

67.0°F (19.4°C) W.B.

64.0°F (18.0°C) W.B.

0.4

61.0°F (16.0°C) W.B.

0.2

0.0 5

14

23

32

41

50

59

68

77

86

95

104 113 118 [°F D.B.]

-15 -10

-5

0

5

10

15

20

25

30

35

40

45 48 [°C D.B.]

Outdoor Temperature

<Figure 2> Outdoor unit temperature correction

Correction factor of power input

OCH800A_18

Correction factor of heating capacity

5-2-2. Heating
1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6
59 60.8 62.6 64.4 66.2 68 69.8 71.6 73.4 75.2 77 78.8 80.6 [°F D.B.] 15 16 17 18 19 20 21 22 23 24 25 26 27 [°C D.B.] Indoor temperature

Correction factor of heating capacity

<Figure 3> Indoor unit temperature correction

1.4

1.3

1.2

1.1

1.0

0.9

0.8 0.7

0.6

0.5

0.4

-13

-4

5

14

23

32

-25

-20

-15

-10

-5

0

Outdoor Temperature

1.4

1.2 1.0

0.8

0.6

0.4

0.2

0.0

-13

-4

5

14

23

32

-25

-20

-15

-10

-5

0

Outdoor Temperature

70.0°F (21.1°C) D.B.

41

50

59 [°F W.B.]

5

10

15 [°C W.B.]

70.0°F (21.1°C) D.B. 61.0°F (16.0°C) D.B. 79.0°F (26.0°C) D.B.

41

50

59 [°F W.B.]

5

10

15 [°C W.B.]

Correction factor of power input

<Figure 4> Outdoor unit temperature correction

OCH800A_19

5-3. Standard operation data (Reference data)

Operation

MXZ-SM72TAM-U1

MXZ-SM96TAM-U1

MXZ-SM120TAM-U1

Operating Ambient Indoor

DB/WB

80°F/67°F

70°F/60°F

80°F/67°F

70°F/60°F

80°F/67°F

70°F/60°F

conditions temperature

(26.7°C/19.4°C) (21.1°C/15.6°C) (26.7°C/19.4°C) (21.1°C/15.6°C) (26.7°C/19.4°C) (21.1°C/15.6°C)

Outdoor

95°F/75°F

47°F / 43°F

95°F/ 75°F

47°F/43°F

95°F/75°F

47°F/43°F

(35.0°C/23.9°C) (8.3°C/6.1°C) (35.0°C/23.9°C) (8.3°C/6.1°C) (35.0°C/23.9°C) (8.3°C/6.1°C)

Indoor unit No. of connected Unit units

6

8

10

No. of units in operation

6

8

10

Model

—

12 × 6

12 × 8

12 × 10

Piping

Main pipe

Ft (m)

15 (4.6)

15 (4.6)

15 (4.6)

Branch pipe

35 (10.7)

35 (10.7)

60 (18.3)

Total pipe length

225 (68.6)

295 (89.9)

615 (187.5)

Fan speed

—

Hi

Hi

Hi

Amount of refrigerant

LBS. OZ. (kg)

30 LBS. 39 OZ. (13.8)

33 LBS. 41 OZ. (15.2)

39 LBS. 116 OZ. (17.8)

Outdoor Electric current

A

16.6

15.7

23.9

22.2

31.3

28.8

unit

Voltage

V

230

230

230

Compressor frequency

Hz

46

55

63

77

79

97

LEV

Indoor unit

opening

Pulse

214

221

208

235

249

254

Pressure High pressure/Low pressure psig

403/148

330/99

403/145

335/93

442/139

331/88

(MPaG)

(2.78/1.02)

(2.28/0.68)

(2.78/1.00)

(2.31/0.64)

(3.05/0.96)

(2.28/0.61)

Temp. of Outdoor Discharge

°F (°C)

145.9

134.1

159.2

135.6

158.3

148.6

each

unit

(63.3)

(56.7)

(70.6)

(57.5)

(70.2)

(64.8)

section

Heat exchanger

103.4

31.3

98.9

29.0

103.7

28.8

outlet

(39.7)

(-0.4)

(37.2)

(-1.7)

(39.8)

(-1.8)

Accumulator inlet

52.6

31.3

52.0

29.0

50.0

28.8

(11.4)

(-0.4)

(11.1)

(-1.7)

(10.0)

(-1.8)

Compressor inlet

52.1 (11.1)

30.6 (-0.8)

51.0 (10.6)

27.7 (-2.4)

48.4 (9.1)

25.3 (-3.7)

Indoor unit LEV inlet

88.2

83.0

82.1

83.5

90.7

82.4

(31.2)

(28.3)

(27.8)

(28.6)

(32.6)

(28.0)

Heat exchanger

54.0

125.3

53.7

127.3

54.1

145.6

inlet

(12.2)

(51.8)

(12.0)

(52.9)

(12.3)

(63.1)

OCH800A_20

5-4. Standard capacity diagram
Before calculating the sum of total capacity of indoor units, please convert the value into the Btu/h model capacity following the formula on “5-1. Selection of indoor and outdoor units”.
MXZ-SM72TAM-U1

Cooling

G(x)

1.4

1.2

Ratio of capacity

1.0

0.8

0.6

0.4

0.2

0.0 0

6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96
Total capacity of indoor units (kBtu/h)

1.4

Ratio of power input

1.2

1.0

0.8

0.6

0.4

0.2

0.0 0

6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96
Total capacity of indoor units (kBtu/h)

Ratio of current

1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0
0

6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96
Total capacity of indoor units (kBtu/h)

208, 230 V

OCH800A_21

Ratio of capacity

Ratio of power input

Heating G(x)

1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0
0
1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0
0

6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96
Total capacity of indoor units (kBtu/h)
6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96
Total capacity of indoor units (kBtu/h)

1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0
0

6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96
Total capacity of indoor units (kBtu/h)

208, 230 V

Ratio of current

OCH800A_22

MXZ-SM96TAM-U1

Cooling

G(x)

Ratio of capacity

1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0
0 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132
Total capacity of indoor units (kBtu/h)
1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0
0 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132
Total capacity of indoor units (kBtu/h)

Ratio of power input

Ratio of current

1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0
0 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132
Total capacity of indoor units (kBtu/h)

208, 230 V

OCH800A_23

Heating

G(x)

1.4 1.2

Ratio of capacity

1.0

0.8

0.6

0.4

0.2

0.0 0 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132
Total capacity of indoor units (kBtu/h)
1.4

Ratio of power input

1.2

1.0

0.8

0.6

0.4

0.2

0.0 0 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132
Total capacity of indoor units (kBtu/h)

Ratio of current

1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0
0 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132
Total capacity of indoor units (kBtu/h)

208, 230 V

OCH800A_24

MXZ-SM120TAM-U1 Cooling

G(x)

Ratio of capacity

1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0
0 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132 138 144 150 156 162
Total capacity of indoor units (kBtu/h)
1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0
0 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132 138 144 150 156 162
Total capacity of indoor units (kBtu/h)

Ratio of power input

Ratio of current

1.4

1.2

1.0

208, 230 V

0.8

0.6

0.4

0.2

0.0 0 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132 138 144 150 156 162
Total capacity of indoor units (kBtu/h)

OCH800A_25

Ratio of capacity

Ratio of power input

Heating
G(x)
1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0
0 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132 138 144 150 156 162 Total capacity of indoor units (kBtu/h)
1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0
0 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132 138 144 150 156 162 Total capacity of indoor units (kBtu/h)
1.4 1.2
208, 230 V 1.0 0.8 0.6 0.4 0.2 0.0
0 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132 138 144 150 156 162 Total capacity of indoor units (kBtu/h)
OCH800A_26

Ratio of current

5-5. Correcting capacity for changes in the length of refrigerant piping
During cooling, obtain the ratio (and the piping equivalent length) of the outdoor units nominal capacity and the total inuse indoor capacity, and find the capacity ratio corresponding to the standard piping length from Figure 5 to 7. Then multiply by the cooling capacity from Figure 1 and 2 in “5-2. Correction by temperature” to obtain the actual capacity. During heating, find the piping equivalent length, and find the capacity ratio corresponding to standard piping length from Figure 8 to 10. Then multiply by the heating capacity from Figure 3 and 4 in “5-2. Correction by temperature” to obtain the actual capacity.
Capacity Correction Curve

5-5-1. Cooling MXZ-SM72TAM-U1
1.00

Total capacity of indoor unit [kBtu/h] 36

0.95 54

0.90

Capacity ratio

72 0.85
93.6 0.80

0.75

0.70 0

50

100

150

200

250

300

350

400

450

500

Piping equivalent length (ft)

<Figure 5> Correction of refrigerant piping length

MXZ-SM96TAM-U1
1.00 0.95 0.90

Total capacity of indoor unit [kBtu/h] 48
72

Capacity ratio

0.85

0.80

96

124.8 0.75

0.70 0

50

100

150

200

250

300

350

400

450

500

Piping equivalent length (ft)

<Figure 6> Correction of refrigerant piping length

OCH800A_27

MXZ-SM120TAM-U1
1.00 0.95 0.90 0.85

Total capacity of indoor unit [kBtu/h] 60 90
120 156

Capacity ratio

0.80

0.75

0.70 0

50

100

150

200

250

300

350

400

450

500

Piping equivalent length (ft)

<Figure 7> Correction of refrigerant piping length

5-5-2. Heating MXZ-SM72TAM-U1
1.00

0.95

0.90

Capacity ratio

0.85

0.80

0.75

0.70 0

50

100

150

200

250

300

350

400

450

500

Piping equivalent length (ft)

<Figure 8> Correction of refrigerant piping length

OCH800A_28

MXZ-SM96TAM-U1
1.00

0.95

0.90

Capacity ratio

0.85

0.80

0.75

0.70 0

50

100

150

200

250

300

350

400

450

500

Piping equivalent length (ft)

<Figure 9> Correction of refrigerant piping length

MXZ-SM120TAM-U1
1.00

0.95

0.90

Capacity ratio

0.85

0.80

0.75

0.70 0

50

100

150

200

250

300

350

400

450

500

Piping equivalent length (ft)

<Figure 10>Correction of refrigerant piping length

Method for obtaining the piping equivalent length Piping equivalent length = piping length to the farthest indoor unit + 0.3 × number of bends in the piping (m)

5-5-3. Correction of heating capacity for frost and defrosting
If heating capacity has been reduced due to frost formation or defrosting, multiply the capacity by the appropriate correction factor from the following table to obtain the actual heating capacity.

Correction factor diagram
Outdoor Intake temperature [°F(°C)WB] Correction factor

43(6) 37(4) 36(2) 32(0) 28(-2) 25(-4) 21(-6) 18(-8) 14(-10) 5(-15) 1.00 0.98 0.89 0.88 0.89 0.90 0.95 0.95 0.95 0.95

-4(-20) -13(-25)

0.95

0.95

OCH800A_29

5-6. Noise criterion curves

MXZ-SM72TAM-U1

MODE SPL(dB) COOLING 53 HEATING 54

LINE

90

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

80

70 NC-70

60 NC-60

50 NC-50

40 NC-40

30 NC-30

APPROXIMATE
20 THRESHOLD OF
HEARING FOR CONTINUOUS NOISE

NC-20

10 63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

MXZ-SM120TAM-U1

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

MODE SPL(dB) COOLING 61 HEATING 62

LINE

90

80

70 NC-70

60 NC-60

50 NC-50

40 NC-40

30 NC-30

APPROXIMATE
20 THRESHOLD OF
HEARING FOR CONTINUOUS NOISE

NC-20

10 63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

MICROPHONE 3 ft (1m)

UNIT

4 ft (1.5m)

MXZ-SM96TAM-U1
90

MODE SPL(dB) COOLING 58 HEATING 59

LINE

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

80

70 NC-70

60 NC-60

50 NC-50

40 NC-40

30 NC-30

APPROXIMATE
20 THRESHOLD OF
HEARING FOR CONTINUOUS NOISE

NC-20

10 63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

OCH800A_30

GROUND

OUTLINES AND DIMENSIONS

Unit: mm
OCH800A_31

7 WIRING DIAGRAM
OCH800A_32

TROUBLESHOOTING

8-1. Checkpoints for test run

8-1-1. Procedures before test run
1. Before a test run, make sure that the following work is completed. · Installation related: Make sure that the panel of cassette type is installed and electrical wiring is done. Otherwise electrical functions like auto vane will not operate normally. · Piping related: Perform leakage test of refrigerant and drain piping. Make sure that all joints are perfectly insulated. Check stop valves on both liquid and gas sides are fully open. · Electrical wiring related: Check ground wire, transmission cable, remote controller cable, and power supply cable for secure connection. Make sure that all switch settings of address or adjustments for special specification systems are correctly made.
2. Safety check: · With the insulation tester of 500 V, inspect the insulation resistance. · Do not touch the transmission cable and remote controller cable with the tester. · The resistance should be over 1.0 M. Do not proceed inspection if the resistance is less than 1.0 M. · Inspect between the outdoor unit power supply terminal block and ground first, metallic parts like refrigerant pipes or the electrical box next, then inspect all electrical wiring of outdoor unit, indoor unit, and all linked equipment.
3. Before operation: · For compressor protection, turn on the breaker for the outdoor unit and wait at least 12 hours before a test run. – The unit might NOT run, in order to protect the compressor, in the case of low outside air temperature.* · Register control systems into remote controller(s). Never touch the on/off switch of the remote controller(s). Refer to Special function operation setting (for M-NET Remote Controller) as for settings. In MA remote controller(s), this registration is unnecessary.
4. More than 12 hours later after turning on the power to the outdoor unit, turn on all the power switches for the test run. Perform test run and make test run reports.
Caution:

• The compressor may not operate immediately after recovery from power failure. Refer to “SW6-3” in 8-5. “Internal switch function table” for how to deal with it.

8-1-2. Test run for M-NET remote controller
Refer to “Test run” for operation procedure.

OCH800A_33

8-1-3. Countermeasures for error during test run

If a problem occurs during test run, a code number will appear on the remote controller (or LED on the outdoor unit), and the air conditioning system will automatically cease operating. Determine the nature of the abnormality and apply corrective measures.
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Error Error

code code (2 digits) (4 digits)

Trouble

Ed

0403 Serial communication error/Model selection SW error

U2

1102 Compressor temperature trouble

UE

1302 High pressure trouble or compressor protector trouble

U7

1500 Superheat due to low discharge temperature trouble

U2

1501 Refrigerant shortage trouble

Closed valve in cooling mode

P6

1503 Freeze protection of plate heat exchanger

Freeze protection of branch box or indoor unit

EF

1508 4-way valve trouble in heating mode

L6

2135 Circulation water freeze protection

PA

2500 Water leakage

P5

2502 Drain overflow protection

P4

2503 Drain sensor abnormality

–

3121 Out-of-range outside air temperature

UF

4100 Compressor current interruption (locked compressor)

Pb

4114 Fan trouble (Indoor unit)

UP

4210 Compressor overcurrent interruption/Failure in 12 VDC

power supply circuit on power circuit board

U9

4220 Voltage shortage/overvoltage/PAM error/L1 open

phase/primary current sensor error/power synchroni-

zation signal error

U5

4230 Heat sink temperature trouble

U6

4250 Power module trouble

U8

4400 Fan trouble (Outdoor unit)

Detected Unit

Indoor

Outdoor

Remote Controller

Remarks

Outdoor unit outdoor multi controller circuit

board ­ Power circuit board communication

trouble, Incorrect setting of model selection

Check delay code 1202

Check delay code 1402

Check delay code 1600

Check delay code 1601

Check delay code 1501

Check delay code 1608

Check delay code 4350

Check delay code 4320

Check delay code 4330

Check delay code 4350

Check delay code 4500

Error Error

code code (2 digits) (4 digits)

Trouble

U3

5101 Air inlet thermistor (TH21) open/short

Compressor temperature thermistor (TH4) open/short

U4

5102 Liquid pipe temperature thermistor (TH22) open/short

Suction pipe temperature thermistor (TH6) open/short

U4

5103 Gas pipe temperature thermistor (TH23) open/short

U4

5105 Outdoor liquid pipe temperature thermistor (TH3)

open/short

U4

5106 Ambient temperature thermistor (TH7) open/short

U4

5109 HIC pipe temperature thermistor (TH2) open/short

U4

5110 Heat sink temperature thermistor (TH8) open/short

F5

5201 High pressure sensor (63HS) trouble

F3

5202 Low pressure sensor (63LS) trouble

UH

5300 Primary current error

P4

5701 Contact failure of drain float switch

A0

6600 Duplex address error

A2

6602 Transmission processor hardware error

A3

6603 Transmission bus BUSY error

A6

6606 Signal communication error with transmission proces-

sor

A7

6607 No ACK error

A8

6608 No response frame error

E0/E4 6831 MA communication receive error

E3/E5 6832 MA communication send error

E3/E5 6833 MA communication send error

E0/E4 6834 MA communication receive error

EF

7100 Total capacity error

EF

7101 Capacity code error

EF

7102 Connecting excessive number of units and branch

boxes

EF

7105 Address setting error

EF

7130 Incompatible unit combination

Detected Unit

Indoor

Outdoor

Remote Controller

Remarks

Check delay code 1202

Check delay code 1211

Check delay code 1205

Check delay code 1221

Check delay code 1222

Check delay code 1214

Check delay code 1402

Check delay code 1400

Check delay code 4310

Only M-NET Remote controller is detected.

Only M-NET Remote controller is detected.

Only M-NET Remote controller is detected.

Only M-NET Remote controller is detected.

Only M-NET Remote controller is detected.

Only M-NET Remote controller is detected.

Only MA Remote controller is detected.

Only MA Remote controller is detected.

Only MA Remote controller is detected.

Only MA Remote controller is detected.

Notes: · When the outdoor unit detects No ACK error/No response error, the target indoor unit is treated as a stop, and not assumed to be abnormal. · The error codes displayed on the units may be different between the error source and others. In that case, please refer to the error code of error source by displayed attribute and address. · Refer to the service manual of indoor unit or remote controller for the detail of error detected in indoor unit or remote controller.
Self-diagnosis function The indoor and outdoor units can be diagnosed automatically using the self-diagnosis switch (SW1) and LED1, LED2 (LED indication) found on the outdoor multi controller circuit board. LED indication: Set all contacts of SW1 to OFF.

During normal operation The LED indicates the drive state of the controller in the outdoor unit.

Bit

1

2

3

4

5

6

Indication

Compressor operated

52C

21S4

SV1

(SV2)

SV3

· Example When the compressor and SV1 are on during cooling operation.

1 23 45 67 8

7

8

—

Always lit

OCH800A_34

0403 (Ed): Serial communication error / Model selection SW error

Abnormal points and detection methods
Serial communication between the outdoor multi controller circuit board and outdoor power circuit board is defective.

Causes and checkpoints
· Wire breakage or contact failure of connector CN2 or CN4
· Malfunction of power board communication circuit on outdoor multi controller circuit board
· Malfunction of communication circuit on outdoor power circuit board
· Incorrect setting of model selection

Diagnosis of failure

Check the connection of the communication line (CN2 and CN4) between the outdoor multi controller circuit board and power circuit board.

No
Are they connected normally?
Yes

Connect the CN2 and CN4 properly. Replace them in the case of breakage.

Check the wiring.

No
Is it connected normally?
Yes
No
Is the model setting correct?
Yes

Connect the wiring properly. Replace them in the case of breakage.
Correct the model settings.
The communication circuit of either the outdoor controller board or power board is defective. If unable to identify the defective circuit; · Replace the outdoor multi controller circuit
board if it does not recover. · Replace the outdoor power circuit board.

OCH800A_35

1102 (U2): Compressor temperature trouble

Chart 1 of 2

Abnormal points and detection methods
· TH4 falls into either of the following temperature conditions: – over 230°F (110°C) continuously for 5 minutes – over 257°F (125°C)
· The saturation temperature converted from the pressure detected by the high pressure sensor exceeds 104°F (40°C) during defrosting, and TH4 exceeds 230°F (110°C)
TH4: Thermistor LEV: Linear expansion valve

Causes and checkpoints
· Malfunction of stop valve · Over-heated compressor operation caused by shortage
of refrigerant · Defective thermistor · Defective outdoor multi controller circuit board · LEV performance failure · Defective indoor controller board · Clogged refrigerant system caused by foreign object · Refrigerant shortage (Refrigerant liquid accumulation in
compressor while indoor unit is OFF/thermo-OFF.)

Diagnosis of failure
Is the error code 5101 displayed when restarted?
No (1102)

Yes (5101)

Refer to the diagnosis of error code 5101.

Is the outdoor stop valve (liquid/gas)

No

fully open?

Yes

Open the stop valve (liquid/gas) fully.

Is there refrigerant leak?
No

Yes

Repair the refrigerant leakage.

Check the connection for thermistor wiring and indoor controller board connector.

Is there any abnormality on connectors/wires such as disconnection, half- disconnection or breakage?
No
Continue to the next page.

Yes

Connect the connector properly (Repair or replace it in the case of breakage).

OCH800A_36

1102 (U2): Compressor temperature trouble
Diagnosis of failure
Continued from the previous page.

Chart 2 of 2

Disconnect the thermistor wiring to check the resistance.

No
Is the resistance detected?
Yes
Check the voltage(*) and appearance of the outdoor multi controller circuit board.

Is the voltage normal value?

No

Is it free from any trace of overheating

or burning?

Yes

Disconnect the indoor LEV wiring and check the resistance.

No
Is the resistance detected?
Yes

*For the voltage, refer to “How to check the components”.

Replace the thermistor.
Replace the outdoor multi controller circuit board.
Replace the indoor LEV. Replace the indoor controller board.

OCH800A_37

1302 (UE): High pressure trouble

Chart 1 of 4

Abnormal points and detection methods
· High pressure abnormality (63H operation) 63H operates() during compressor operation. ( 602 psig [4.15 MPaG])
· High pressure abnormality (63HS detected) – A pressure detected by 63HS is 625 psig (4.31 MPaG) or more during compressor operation. – A pressure detected by 63HS is 600 psig (4.14 MPaG) or more for 3 minutes during compressor operation.
63H: High pressure switch 63HS: High pressure sensor LEV: Linear expansion valve SV1: Solenoid valve TH7: Thermistor TRS: Thermal protector

Causes and checkpoints
· Faulty operation of stop valve (not fully open) · Clogged or broken pipe · Malfunction or locked outdoor fan motor · Short-cycle of outdoor unit · Dirt of outdoor heat exchanger · Remote controller transmitting error caused by noise
interference · Contact failure of the outdoor multi controller circuit
board connector · Defective outdoor multi controller circuit board · Short- cycle of indoor unit · Decreased airflow, clogged filter, or dirt on indoor unit · Malfunction or locked indoor fan motor · Decreased airflow caused by faulty inspection of out-
door temperature thermistor (It detects lower temperature than actual temperature.) · Indoor LEV performance failure · Malfunction of fan driving circuit · SV1 performance failure · Defective High pressure sensor · Defective High pressure sensor input circuit on outdoor multi controller circuit board · High compressor temperature (Thermal protector TRS operated)

Diagnosis of failure

OCH800A_38

Turn OFF the power of indoor/outdoor unit, Fresh Master, Lossnay and remote controller simultaneously for 10 minutes, then turn the power back ON. Is the error code <6607> No ANC error displayed ?
No
Is the error code 5201 displayed when restarted?
No (1302)
Is the outdoor stop valve (liquid/gas) fully open?
Yes

Yes
Yes (5201)
No

Does the outdoor fan rotate during the

No

operation?

Yes

Does the indoor fan rotate during the operation?
Yes
Is the indoor unit short-cycled?

No
Yes (Short-cycled)

No (Not short-cycled)
Continue to the next page.

There is abnormality in circuit board or wiring connection on the outdoor unit.
Refer to the diagnosis of error code 5201.
Open the stop valve (liquid/gas) fully.
Check the outdoor fan motor. Refer to “How to check the parts” on the outdoor unit service manual.
Check the indoor fan motor. Refer to “How to check the parts” on the indoor unit service manual.
Resolve the short-cycle.

1302 (UE): High pressure trouble

Diagnosis of failure
Continued from the previous page.
Is the indoor unit filter clogged?
No (Not clogged)

Yes (Clogged filter)

Clean the filter.

Is there dirt on the indoor heat exchanger?
No (Not dirty)

Yes (Dirty)

Wash the indoor heat exchanger.

Is the outdoor unit short-cycled?

Yes (Short-cycled)

No (Not short-cycled)

Resolve the short cycle.

Is there dirt on the outdoor heat exchanger?
No (Not dirty)

Yes (Dirty)

Wash the outdoor heat exchanger.

Are the pipes clogged or broken?
No

Yes

Check and repair piping.

Disconnect the TH7 wiring and check the resistance.

Continue to the next page.

Chart 2 of 4

OCH800A_39

1302 (UE): High pressure trouble
Diagnosis of failure
Continued from the previous page.

No
Is the resistance detected?
Yes
Disconnect the indoor LEV wiring to check the resistance.
No
Is the resistance detected?
Yes

Replace the TH7. Replace the indoor LEV.

Check the voltage(*) and appearance of the indoor controller board.

Is the voltage normal?

No

Is it free from any trace of overheating

or burning?

Yes

Check the resistance of SV1.

Replace the indoor controller board.

Continue to the next page. *For the voltage, refer to “How to check the components”.

Chart 3 of 4

OCH800A_40

1302 (UE): High pressure trouble
Diagnosis of failure
Continued from the previous page.

No
Is the resistance detected?
Yes

Replace the SV1.

Is the connector for outdoor multi controller circuit board 63H disconnected or loose?
No

Yes

Check the 63HS voltage.

Reconnect the connector or connect it tightly.

Chart 4 of 4

No
Is the voltage() detected?
Yes
For the voltage, refer to “How to check the components”.

Replace the 63HS.
Replace the outdoor multi controller circuit board.

OCH800A_41

1500 (U7): Superheat due to low discharge temperature trouble
Chart 1 of 2

Abnormal points and detection methods
10 or more minutes after the compressor starts operation, if a discharge superheat of -27°F (-15°C)* or less is detected for 5 consecutive minutes even though the indoor LEV has the minimum open pulse.
LEV: Linear expansion valve TH4: Thermistor 63HS: High pressure sensor

• At this temperature, conditions for the abnormality detection will not be satisfied if no abnormality is detected on either TH4 or 63HS.

Causes and checkpoints
· Disconnection or loose connection of TH4 · Defective holder of TH4 · Disconnection of LEV coil · Disconnection of LEV connector · LEV performance failure

Diagnosis of failure

Is the TH4 wiring disconnected?

Yes (Disconnected)

No (Connected properly)

Check the resistance of TH4.

No
Is the resistance normal?
Yes

Connect the wiring properly.

temp. – resistance characteristic

32°F (0°C)

700 k

50°F (10°C)

410 k

68°F (20°C)

250 k

86°F (30°C)

160 k

104°F (40°C)

104 k

Replace the TH4.

Check the connector contact and wiring of the indoor LEV.

Is there any abnormality such as half-disconnection or breakage?
No

Yes

Disconnect the indoor LEV wiring to check the resistance.

Connect the connector properly, or replace the LEV.

Continue to the next page.

OCH800A_42

1500 (U7): Superheat due to low discharge temperature trouble
Chart 2 of 2
Diagnosis of failure
Continued from the previous page.

No
Is the resistance detected?
Yes
Check the voltage and appearance of the indoor controller board.

Replace the indoor LEV.

Is the voltage normal?

No

Is it free from any trace of overheating

or burning?

Yes

Check the 63HS voltage.

Replace the indoor controller board.

No
Is the voltage() detected?
Yes
For the voltage, refer to “How to check the components”.

Replace the 63HS.
Replace the outdoor multi controller circuit board.

OCH800A_43

1501 (U2): Refrigerant shortage trouble

Chart 1 of 2

Abnormal points and detection methods
· All of the following conditions have been satisfied for 15 consecutive minutes: – The compressor is operating in HEAT mode. – Discharge superheat is 144°F (80°C) or more. – Difference between TH7 and TH3 fits the formula of TH7-TH3 < 9°F (5°C) – The saturation temperature converted from the pressure detected by the high pressure sensor is below 95°F (35°C).
· All of the following conditions have been satisfied: – The compressor is in operation. – When cooling, discharge superheat is 144°F (80°C) or more, and the saturation temperature converted from the pressure detected by the high pressure sensor is over -40°F (-40°C). – When heating, discharge superheat is 162°F (90°C) or more.

Causes and checkpoints
· Defective operation of stop valve (not fully open) · Defective thermistor · Defective outdoor multi controller circuit board · Indoor LEV performance failure · Gas leakage or shortage · Defective 63HS
TH3: Thermistor TH7: Thermistor LEV: Linear expansion valve 63HS: High pressure sensor

Diagnosis of failure

Is the outdoor stop valve (ball valve)

No

fully open?

Yes

Is there refrigerant leak?

Yes

No

Is the error code 5104 displayed when restarted?
No (1501)

Yes (5104)

Check relevant thermistor wirings and connector contacts of the outdoor multi controller circuit
board.

Open the stop valve (ball valve) fully. Repair the refrigerant leak. Refer to the diagnosis of error code 5104.

Is there any abnormality on connectors such as disconnection, half- disconnection or breakage?
No

Yes

Disconnect the thermistor wiring and check the resistance.

Connect the connector properly (Repair or replace it in the case of breakage).

Continue to the next page.

OCH800A_44

1501 (U2): Refrigerant shortage trouble
Diagnosis of failure
Continued from the previous page.

No
Is the resistance detected?
Yes

Replace the thermistor.

Check the 63HS voltage.

No
Is the voltage(*) detected?
Yes
Check the voltage and appearance of the outdoor multi controller circuit board.

Is the voltage normal value?

No

Is it free from any trace of overheating

or burning?

Yes

Disconnect the indoor LEV wiring and check the resistance.

No
Is the resistance detected?
Yes
*For the voltage, refer to “How to check the components”.

Replace the 63HS.
Replace the outdoor multi controller circuit board.
Replace the indoor LEV. Replace the indoor controller board.

Chart 2 of 2

OCH800A_45

1501 (U2): Closed valve in cooling mode

Abnormal points and detection methods
Stop valve is closed during cooling operation. Both of the following temperature conditions have been satisfied for 20 minutes or more during cooling operation.
TH22j-TH21j -3.6°F (-2°C) TH23j-TH21j -3.6°F (-2°C)
Note: · For indoor unit, the abnormality is detected if an operating unit satisfies the condition.

Causes and checkpoints
· Outdoor liquid/gas valve is closed. · Malfunction of outdoor LEV (LEV1) (blockage)
TH21: Indoor intake temperature thermistor (RT11 or TH1) TH22: Indoor liquid pipe temperature thermistor (RT13 or TH2) TH23: Indoor gas pipe temperature thermistor (TH-A to E) LEV: Linear expansion valve

Diagnosis of failure

Is the outdoor stop valve (liquid/gas)

No

fully open?

Yes

Open the outdoor stop valve (liquid/gas) fully.

Disconnect the outdoor LEV wiring to check the resistance.

No
Is the resistance detected?
Yes

Replace the outdoor LEV.
Replace the outdoor multi controller circuit board.

OCH800A_46

1503 (P6): Freeze protection of plate heat exchanger / Freeze protection of branch box or indoor unit

Abnormal points and detection methods
The purpose of the error code is to prevent indoor unit from freezing or condensation which is caused when a refrigerant keeps flowing into the indoor unit that is not operating.
All of the following conditions have been satisfied: · The compressor is operating in COOL mode. · 15 minutes have passed after the startup of the com-
pressor, or the change in the number of operating indoor units is made (including a change by turning thermo-ON/OFF). · After the condition 2 above is satisfied, the thermistor of indoor unit in STOP detects TH22j 23°F (-5 °C) for 5 consecutive minutes.

Causes and checkpoints
· Wrong piping connection between indoor unit and branch box
· Miswiring between indoor unit and branch box · Miswiring of LEV in branch box · Malfunction of LEV in branch box

Diagnosis of failure

Check the port to which the piping and

wiring between the indoor unit and branch

No

box is connected.

Is the piping and wiring connected to the

same port?

Yes

Connect the piping and wiring to the same port.

Check the port to which the LEV wiring of branch box is connected.

No

Is the wiring connected to the same port as

the corresponding branch box?

Yes

Check the LEV wiring of indoor unit that is

No

not via branch box is connected properly.

Yes

Connect the LEV wiring to the intended port properly.
Connect the LEV wiring properly.

Disconnect the LEV wiring of branch box or indoor unit to check the resistance.
No
Is the resistance detected?
Yes

Replace the LEV coil.

Replace the LEV assy in branch box or the LEV of indoor unit that is not via branch box.

OCH800A_47

1508 (EF): 4-way valve trouble in heating mode

Abnormal points and detection methods
4-way valve does not operate during heating operation. Any of the following temperature conditions is satisfied for 3 minutes or more during heating operation when the outdoor temperature is -4°F (-20°C) or more:
TH22j-TH21j -18°F (-10°C) TH23j-TH21j -18°F (-10°C) TH22j 37.4°F (3°C) TH23j 37.4°F (3°C)
Note: · For indoor unit, the abnormality is detected if an operating unit satisfies the condition.
TH21: Indoor intake temperature thermistor (RT11 or TH1) TH22: Indoor liquid pipe temperature thermistor (RT13 or TH2) TH23: Indoor gas pipe temperature thermistor (TH-A to E)

Causes and checkpoints
· 4-way valve failure · Disconnection or failure of 4-way valve coil · Clogged drain pipe · Disconnection or loose connection of connectors · Malfunction of input circuit on outdoor multi controller
circuit board · Defective outdoor power circuit board

Diagnosis of failure

Is the connector for outdoor multi controller circuit board or 4-way valve coil disconnected or loose?
No

Yes

Reconnect the connector or connect it tightly.

Disconnect the connector for outdoor multi
controller circuit board or 4-way valve coil to check the resistance.

No
Is the resistance detected?
Yes
Check the voltage and appearance of the outdoor multi controller circuit board.

Is the detected voltage normal?

No

Is it free from any trace of over-heat-

ing or burning?

Yes

Refer to ”How to check the parts” for ohm values.

Replace the 4-way valve coil.
Replace the outdoor multi controller circuit board. Replace the 4-way valve.

OCH800A_48

3121: Out-of-range outside air temperature

Abnormal points and detection methods
· When the thermistor temperature of -24°F (-31.1°C) or below has continuously been detected for 3 minutes during heating operation (during compressor operation), the unit makes an error stop and “3121” appears on the LED1 and LED2.
· The compressor restarts when the thermistor temperature is -14°F (-25.6°C) or above.
· If the unit is turned OFF, the outdoor temperature error will be canceled.

Causes and checkpoints
· Outdoor air temperature · Thermistor failure · Wire failure · Defective outdoor controller board

Diagnosis of failure

Check the outdoor air temperature.

Is the outdoor air temperature -24°F

No

(-31.1°C) or higher?

Yes

Check the resistance of TH7.

Use in operation range, which is -14°F (-25.6°C) or more in heating mode.

No
Is the resistance normal?
Yes
Check for pinched lead wire, condition of wire coating and disconnected wire.
No
Is wire condition normal?
Yes

Replace the TH7.
Remove the abnormal point. Replace the outdoor controller board.

OCH800A_49

4100 (UF): Compressor current interruption (Locked compressor)
Chart 1 of 2

Abnormal points and detection methods
Overcurrent of DC bus or compressor is detected within 30 seconds after the compressor starts the operation.

Causes and checkpoints
· Closed stop valve · Decrease of power supply voltage · Looseness, disconnection, or wrong phase of compres-
sor wiring connection · Incorrect DIP-SW setting of model selection on the
outdoor controller board · Defective compressor · Defective outdoor power circuit board

Diagnosis of failure

Check the stop valve.

Is the stop valve (liquid/gas) fully

No

open?

Yes

Check the power supply voltage.

No
Is the power supply voltage normal?
Yes
Check if the model selection switches are set correctly on the indoor controller board or outdoor multi controller circuit board.
No
Are they set properly?
Yes
Turn the power OFF to check for looseness, disconnection, or wrong phase of compressor wiring connection.
Continue to the next page.

Open the stop valve (liquid/gas) fully.
· Check the looseness, disconnection, or breakage of compressor wiring.
· Ensure power supply from the facility. (Check for power supply open phase.)
Set the model selection switches correctly, then restart.

OCH800A_50

4100 (UF): Compressor current interruption (Locked compressor)
Chart 2 of 2
Diagnosis of failure
Continued from the previous page.

No
Are they connected properly?
Yes

Connect the compressor wiring (U, V and W phase) properly, then turn the power back ON.

Check whether the compressor is faultily grounded or not.

No
Is the compressor faultily grounded?
Yes

Replace the outdoor power circuit board (Defective outdoor power circuit board).

Replace the compressor (Defective compressor).

OCH800A_51

4210 (UP): Compressor overcurrent interruption/Failure in 12 VDC power supply circuit on power circuit board
Chart 1 of 2

Abnormal points and detection methods
· Overcurrent of DC bus or compressor is detected 30 or more seconds after the compressor starts the operation.
· 12 VDC power is not supplied from the 12 VDC supply circuit on the power circuit board.

Causes and checkpoints
· Closed outdoor stop valve · Decrease of power supply voltage · Looseness, disconnection, or wrong phase of compres-
sor wiring connection · Model selection error on indoor controller board or out-
door multi controller circuit board · Defective compressor · Defective outdoor power circuit board · Defective outdoor multi controller circuit board · Malfunction of indoor/outdoor unit fan · Short-cycle of indoor/outdoor unit

Diagnosis of failure

Which sub code is displayed?
8
Check the outdoor stop valve.

7

Replace the outdoor power circuit board

(Defective outdoor power circuit board).

The sub codes are displayed by an operation of SW1 on the outdoor multi controller circuit board.

SW1 Setting
ON OFF
12345678

Display on LED1,2 1 23 45 67 8

7: 12 V power supply circuit trouble 8: Overcurrent trouble

Is the stop valve (liquid/gas) fully

No

open?

Yes

Check whether the power supply voltage is normal or not.

Open the stop valve (liquid/gas) fully.

No
Is the power supply voltage normal?
Yes
Check if the model selection switches are set correctly on the indoor controller board or outdoor multi controller circuit board.
No
Are they set properly?
Yes
Turn the power OFF to check for looseness, disconnection, or wrong phases of the compressor wiring.
Continue to the next page.

· Check the looseness, disconnection, or breakage of compressor wiring.
· Ensure power supply from the facility. (Check for power supply open phase.)
Set the model selection switches correctly.

OCH800A_52

4210 (UP): Compressor overcurrent interruption/Failure in 12 VDC power supply circuit on power circuit board
Chart 2 of 2
Diagnosis of failure
Continued from the previous page.

No
Are they connected properly?
Yes

Connect the compressor wiring (U, V and W phase) properly, then turn the power back ON.

Check the operation of indoor/outdoor fan motors.

No
Does it operate normally?
Yes
Check for indoor/outdoor short-cycle.

Check the DC fan motor.

Are those units short-cycled?

Yes (Short-cycled)

Remove factor(s) causing the short-cycle.

No (Not short-cycled)
Disconnect the compressor wiring from the outdoor power circuit board, then check the voltage among each phases U, V and W during test run (SW7-1 ON).

Make sure to perform a voltage check with the same performing frequencies.

Are the voltage among the phases

No

U-V, V-W and W-U different?

Yes

Replace the outdoor multi controller circuit board.

Replace the compressor.

No
Does it operate normally?
Yes

Replace the outdoor power circuit board. Complete

OCH800A_53

4220 (U9): Voltage shortage/Overvoltage/PAM error/L1 open phase/ Primary current sensor error/Power synchronization signal error
Chart 1 of 2

Abnormal points and detection methods
Any of the following symptoms are detected; · Decrease of DC bus voltage to 200 V (1-phase), 200 V
(3-phase)
· Increase of DC bus voltage to 400 V (1-phase), 380 V
(3-phase) · DC bus voltage stays at 310 V or less for 30 consecu-
tive seconds when the operational frequency is over 20 Hz. Any of the following conditions is satisfied while the detections value of primary current is 0.1 A or less. · The operational frequency is 40 Hz or more. · The compressor current is 6 A or more.

Causes and checkpoints
· Decrease/increase of power supply voltage · L1 open-phase (3-phase only) · Primary current sensor failure · Disconnection of compressor wiring · Malfunction of 52C relay · Defective outdoor power circuit board · Malfunction of 52C relay driving circuit on outdoor multi
controller circuit board
· Disconnection of CN2 · Malfunction of primary current detecting circuit on out-
door power circuit board · Malfunction of resistor connected to 52C relay on out-
door power circuit board (3-phase only)
1-phase: 1-phase model 3-phase: 3-phase 3-wire model The black square () indicates a switch position.

Diagnosis of failure

7, 8

Is there any abnormality on wiring?
No
Which sub code is displayed?
3
Does the DC bus voltage rise to approx. 380 V at PAM driving?
No
Is there any abnormality on PAM wirings or reactor?
No
Is there any abnormality at the PAM circuit on the outdoor power circuit board?
No
Is there any abnormality at the PAM power supply circuit or 52C relay drive signal circuit on the outdoor multi controller?
No

Yes

a. L1 open-phase (3-phase model only) b. Disconnection of compressor wiring c. Disconnection of terminal block for power supply d. Disconnection of noise filter circuit board e. Disconnection of power circuit board f. Disconnection of CN52C (1-phase model only)
g. Disconnection of CN2

TThheessuubbcocdoedseasreadreispdlaisypeldaybey danboypaenratoiopneoraf tion of SSWW11oonnthteheouotduotodrocoornmtroullletir cboanrtdro. ller circuit board.

SW1 Setting
ON OFF
12345678

Display on LED1,2 1 23 45 67 8

3: PAM error 6: Input sensor trouble
7: Shortage voltage trouble 8: Overvoltage trouble

6

Replace the outdoor power circuit board

(defective outdoor power board).

Yes

Check the power supply facility.

Yes Yes

Correct the wiring. Replace the reactor if it is broken.
Replace the outdoor power circuit board (defective outdoor power board).

Yes

Replace the outdoor multi controller circuit board (breakage of wiring for PAM controlling power supply).
Replace the outdoor power circuit board (defective outdoor power circuit board).

Continue to the next page. *Refer to “How to check the parts”. OCH800A_54

4220 (U9): Voltage shortage/Overvoltage/PAM error/L1 open phase/ Primary current sensor error/Power synchronization signal error
Chart 2 of 2 The black square () indicates a switch position.
Diagnosis of failure
Continued from the previous page.
7, 8
Check the power supply voltage on the terminal block of the outdoor unit.

No
Is the power supply normal?
Yes

Check the power supply facility.

Check the bus voltage read by the microprocessor with an operation of SW1 on the outdoor multi controller
circuit board.

The bus voltage can be displayed by an operation of SW1 on the outdoor multi controller circuit board.

SW1 Setting

Display on LED1,2 Unit

ON

OFF

0­9999

V

12345678

Check the bus voltage at the test points listed below on the outdoor power circuit board using a multimeter.
Test points: CNDC 1-3 pin

No
Is the bus voltage normal?
Yes

Check the resistor connected to 52C relay and reactor. Replace it if the resistor is broken. Replace the outdoor power circuit board if the resistor is not broken.
Operate the unit and check if the problem occurs again.

OCH800A_55

4230 (U5): Heat sink temperature trouble

Abnormal points and detection methods
TH8 detects a temperature outside the specified range during compressor operation.
TH8: Thermistor

Causes and checkpoints
· Blocked outdoor fan · Malfunction of outdoor fan motor · Blocked airflow path · Rise of ambient temperature · Characteristic defect of thermistor · Malfunction of input circuit on outdoor power circuit
board · Malfunction of outdoor fan driving circuit

Diagnosis of failure

Is error code 5110 displayed when restarted?
No

Yes

Refer to the diagnosis of error code 5110.

Does the fan rotate during compressor operation?
Yes
Is there any obstacle which blocks an airflow around the heat sink?
No (no obstacle)

No
Refer to the diagnosis of error code 4400.

Yes (air path blocked)

Improve the airflow path.

Check the wiring and connector connection of TH8.

Is there any abnormality such as disconnection, looseness or breakage?
No

Yes

Check the resistance of TH8.
No
Is the resistance normal?
Yes

Connect the wiring/connector properly. Replace it in the case of breakage.

TH8 temp. – resistance characteristic

32°F (0°C)

180 k

77°F (25°C)

50 k

122°F (50°C)

17 k

158°F (70°C)

8 k

194°F (90°C)

4 k

Replace the thermistor (Defective thermistor).

Replace the outdoor power circuit board (Defective outdoor power circuit board).

OCH800A_56

4250 (U6): Power module trouble

Abnormal points and detection methods
Both of the following conditions have been satisfied: · Overcurrent of DC bus or compressor is detected during
compressor operation. · Inverter power module is determined to be faulty.

Causes and checkpoints
· Short-circuit caused by looseness or disconnection of compressor wiring
· Defective compressor · Defective outdoor power circuit board

Diagnosis of failure
Turn the power OFF to check for looseness or disconnection of the compressor wiring.

No
Is it connected properly?
Yes
1. Disconnect the compressor wiring (U-V-W phase).
2. Turn ON the SW7-1(*) on the outdoor multi controller circuit board.
3. Operate the unit.

Connect the compressor wiring (U, V and W phase) properly, then turn the power back ON.

No
Is error code 4250 still displayed?
Yes

• SW7-1 ON: Ignore 5300(UH) error.

Replace the compressor (Defective compressor).
Replace the outdoor power circuit board or the outdoor multi controller circuit board (Defective outdoor power circuit board).

OCH800A_57

4400 (U8): Fan trouble (Outdoor unit)

Abnormal points and detection methods
No rotational frequency is detected, a value outside the specified range is detected during fan motor operation.

Causes and checkpoints
· Malfunction of fan motor · Disconnection of CNF connector · Defective outdoor multi controller circuit board

Diagnosis of failure

Check the fuse on the outdoor multi controller circuit board.

Has the fuse melted?
No (Not melted)

Yes (Melted)

Replace the outdoor multi controller circuit board. Replace the defective fan motor.*

Check the fan motor connector (CNF1 and CNF2) for disconnection or looseness.

Is there any abnormality such as disconnection, looseness or breakage?
No

Yes

1. While the breaker is OFF, disconnect the compressor wiring (U/V/W) from the outdoor power circuit board.
2. While the breaker is OFF, disconnect the fan motor connector CNF1 and CNF2.
3. When 5 minutes have passed since turning ON the breaker, turn SW7-1 ON.
4. Check the voltage of the outdoor multi controller circuit board.
Test points are; · VDC approx. 310 to 350 V DC (fan connector 1­4) · VCC approx. 15 V DC (fan connector 5­4) · VCC approx. 0­6.5 V DC (fan connector 6­4)

Connect the wiring/connector properly. Replace it in the case of breakage.

No
Is the voltage normal?
Yes

Replace the outdoor multi controller circuit board (Malfunction of thermistor circuit).
Replace the defective fan motor.

• For the detail, refer to “Check method of DC fan motor (fan motor/outdoor multi controller circuit board)”.
  Note: · Set SW7-1 OFF after the troubleshooting completes. · The fan sometimes starts on-off cycle operation during low-load operation or cooling at low outside temperature. It is not abnormal; the operation ensures reliability of the product.

OCH800A_58

5101 (U3): Compressor temperature thermistor (TH4) open/short <Detected in outdoor unit>

Abnormal points and detection methods
TH4 is found to be open/short. (The open/short detection is disabled for 10 minutes after compressor starts, during defrosting operation, or for 10 minutes after returning from the defrosting operation. The detection is also disabled when the outdoor temperature is 41°F (5°C) or less in cooling operation, and -4°F (-20°C) or less in heating)
Open: 37.4°F (3°C) or less* Short: 422.6°F (217°C) or more TH4: Thermistor