Mitsubishi MXZ-4C36NAHZ-U1, MXZ-8C48NAHZ-U1, MXZ-5C42NAHZ-U1, MXZ-8C48NAHZ, MXZ-8C48NA Technical & Service Manual

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Page 1

TECHNICAL & SERVICE MANUAL

CONTENTS

TECHNICAL CHANGES

.........................................

1. SAFETY PRECAUTION

....................................

2. OVERVIEW OF UNITS

......................................

3. SPECIFICATIONS

............................................

4. DATA

................................................................

5. OUTLINES AND DIMENSIONS

......................

6. WIRING DIAGRAM

.........................................

NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION

....

8. TROUBLESHOOTING

....................................

PRECAUTIONS AGAINST REFRIGERANT LEAKAGE

....

140

10. DISASSEMBLY PROCEDURE

......................

141

No. OCH573

REVISED EDITION-C

MXZ-4C36NAHZ MXZ-4C36NAHZ-U1

MXZ-5C42NAHZ MXZ-5C42NAHZ-U1

MXZ-8C48NAHZ MXZ-8C48NAHZ-U1

MXZ-8C48NA MXZ-8C48NA-U1

MXZ-8C60NA-U1

PAC-MKA50BC

PAC-MKA30BC

PAC-MKA51BC

PAC-MKA31BC

HFC

utilized

R410A

October 2016

Notes:

• This service manual describes technical data of outdoor unit and branch box. As for indoor units, refer to its service manual.

• RoHS compliant products have <G> mark on the spec name plate.

[Model Name] <Outdoor unit>

MXZ-4C36NAHZ

MXZ-5C42NAHZ

MXZ-8C48NAHZ

MXZ-8C48NA

MXZ-8C60NA

PAC-MKA50BC

PAC-MKA30BC

PAC-MKA51BC

PAC-MKA31BC

PARTS CATALOG (OCB573)

[Service Ref.]

OUTDOOR UNIT: MXZ-4C36NAHZ

BRANCH BOX: PAC-MKA51BC

Model name indication

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

Revision:

• Added PAC-MKA51BC, PAC-MKA31BC, MXZ-4C36NAHZ-U1, MXZ-5C42NAHZ-U1, MXZ-8C48NAHZ-U1, MXZ-8C48NA-U1, and MXZ-8C60NA-U1 in REVISED

EDITION-C.

• Some descriptions have been modified.

OCH573 REVISED EDITION-B is void.

Page 2

TECHNICAL CHANGES

MXZ-4C36NAHZ MXZ-4C36NAHZ-U1 MXZ-5C42NAHZ MXZ-5C42NAHZ-U1 MXZ-8C48NAHZ MXZ-8C48NAHZ-U1 MXZ-8C48NA MXZ-8C48NA-U1

Service ref. have been changed as follows.

• The shape of piping around a stop valve (T7W E04 410) has been changed.

• The shape of valve bed has been changed.

OCH573C

Page 3

Cautions for units utilizing refrigerant R410A

1-1. ALWAYS OBSERVE FOR SAFETY

Use new refrigerant pipes.

Charge refrigerant from liquid phase of gas cylinder.

If the refrigerant is charged from gas phase, composition change may occur in refrigerant and the efficiency will be lowered.

Do not use refrigerant other than R410A.

If other refrigerant (R22, etc.) is used, chlorine in refrigerant can cause deterioration of refrigerant oil, etc.

Use a vacuum pump with a reverse flow check valve.

Vacuum pump oil may flow back into refrigerant cycle and that can cause deterioration of refrigerant oil, etc.

Use the following tools specifically designed for use with R410A refrigerant.

The following tools are necessary to use R410A refrigerant.

Handle tools with care.

If dirt, dust or moisture enters into refrigerant cycle, that can cause deterioration of refrigerant oil or malfunction of compressor.

Do not use a charging cylinder.

If a charging cylinder is used, the composition of refrigerant will change and the efficiency will be lowered.

Flare tool

Electronic refrigerant charging scale

Vacuum pump adaptor

Size adjustment gauge

Gauge manifold

Torque wrench

Gas leak detector

Charge hose

Tools for R410A

Contamination inside refrigerant piping can cause deterioration of refrigerant oil, etc.

If large amount of mineral oil enters, that can cause deterioration of refrigerant oil, etc.

Make sure that the inside and outside of refrigerant piping is clean and it has no contaminants such as sulfur, oxides, dirt, shaving particles, etc, which are hazard to refrigerant cycle. In addition, use pipes with specified thickness.

The refrigerant oil applied to flare and flange connections must be ester oil, ether oil or alkylbenzene oil in a small amount.

Ventilate the room if refrigerant leaks during operation. If refrigerant comes into contact with a flame, poisonous gases will be released.

Never use any refrigerant other than that specified.

Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions.

Use the specified refrigerant only.

Store the piping indoors, and both ends of the piping sealed until just before brazing. (Leave elbow joints, etc. in their packaging.)

If dirt, dust or moisture enters into refrigerant cycle, that can cause deterioration of refrigerant oil or malfunction of compressor.

1-2. CAUTIONS RELATED TO NEW REFRIGERANT

Before obtaining access to terminal, all supply circuit must be disconnected.

1 SAFETY PRECAUTION

OCH573C

Page 4

Unit

Electronic weighing scale

[3] Service tools

(1) Use the below service tools as exclusive tools for R410A refrigerant.

No. Tool name Specifications

1 Gauge manifold ·Only for R410A

·Use the existing fitting

specifications

. (UNF1/2)

Use high-tension side pressure of 768.7 PSIG [5.3 MPaG] or over.

2 Charge hose ·Only for R410A

·Use pressure performance of 738.2 PSIG [5.09MPaG] or over.

3 Electronic scale

4 Gas leak detector ·Use the detector for R134a, R407C or R410A.

5 Adaptor for reverse flow check ·Attach on vacuum pump.

6 Refrigerant charge base

7 Refrigerant cylinder ·Only for R410A ·Top of cylinder (Pink)

·Cylinder with syphon

8 Refrigerant recovery equipment

[2] Additional refrigerant charge

When charging directly from cylinder

(1) Check that cylinder for R410A on the market is a syphon type. (2) Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)

[1] Cautions for service

(1) Perform service after recovering the refrigerant left in unit completely. (2) Do not release refrigerant in the air. (3) After completing service, charge the cycle with specified amount of refrigerant. (4) If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them.

OCH573C

Page 5

1-3. Cautions for refrigerant piping work

New refrigerant R410A is adopted for replacement inverter series. Although the refrigerant piping work for R410A is

same as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the working pressure of R410A is 1.6 times higher than that of R22, their sizes of flared sections and flare nuts are different.

1 Thickness of pipes

Because the working pressure of R410A is higher compared to R22, be sure to use refrigerant piping with thickness shown below. (Never use pipes of 7/256 in [0.7 mm] or below.)

2 Dimensions of flare cutting and flare nut

The component molecules in HFC refrigerant are smaller compared to conventional refrigerants. In addition to that, R410A is a refrigerant, which has higher risk of leakage because its working pressure is higher than that of other refrigerants. Therefore, to enhance airtightness and strength, flare cutting dimension of copper pipe for R410A has been specified separately from the dimensions for other refrigerants as shown below. The dimension B of flare nut for R410A also has partly been changed to increase strength as shown below. Set copper pipe correctly referring to copper pipe flaring dimensions for R410A below. For 1/2 and 5/8 inch pipes, the dimension B changes.

Use torque wrench corresponding to each dimension.

3 Tools for R410A (The following table shows whether conventional tools can be used or not.)

1/4 3/8 1/2 5/8 3/4

6.35

9.52

12.70

15.88

19.05

1/32 [0.8]

5/128 [1.0]

—

1/32 [0.8]

1/32 [0.8] 5/128 [1.0] 5/128 [1.0]

Nominal

dimensions

(in)

Diagram below: Piping diameter and thickness

Outside

diameter

(mm)

Thickness

: in [mm]

R410A R22

1/4 3/8 1/2 5/8 3/4

6.35

9.52

12.70

15.88

19.05

11/32-23/64 [ 9.1] 1/2-33/64 [13.2] 41/64-21/32 [16.6] 49/64-25/32 [19.7] —

9.0

13.0

16.2

19.4

23.3

Nominal

dimensions (in)

Flare cutting dimensions

Outside

diameter (mm)

Dimension A

( )

-0.4

Unit : in [mm]

R410A R22

1/4 3/8 1/2 5/8 3/4

6.35

9.52

12.70

15.88

19.05

43/64 [17.0] 7/8 [22.0] 1-3/64 [26.0] 1-9/64 [29.0]

17.0

22.0

24.0

27.0

36.0

Nominal

dimensions (in)

Flare nut dimensions

Outside

diameter (mm)

Dimension B

Unit: in [mm]

R410A R22

—

Gauge manifold Charge hose Gas leak detector

Refrigerant recovery equipment Refrigerant cylinder Applied oil

Safety charger

Charge valve

Vacuum pump

Flare tool

Bender Pipe cutter Welder and nitrogen gas cylinder Refrigerant charging scale Vacuum gauge or thermistor vacuum gauge and vacuum valve Charging cylinder

Air purge, refrigerant charge and operation check Gas leak check Refrigerant recovery Refrigerant charge Apply to flared section

Prevent compressor malfunction when charging refrigerant by spraying liquid refrigerant Prevent gas from blowing out when detaching charge hose Vacuum drying and air purge

Flaring work of piping

Bend the pipes Cut the pipes Weld the pipes Refrigerant charge Check the degree of vacuum. (Vacuum valve prevents back flow of oil and refrigerant to thermistor vacuum gauge) Refrigerant charge

Tool exclusive for R410A Tool exclusive for R410A Tool for HFC refrigerant Tool exclusive for R410A Tool exclusive for R410A

Ester oil, ether oil and alkylbenzene oil (minimum amount)

Tool exclusive for R410A

Tools for other refrigerants can be used if equipped with adopter for reverse flow check Tools for other refrigerants can be used by adjusting flaring dimension Tools for other refrigerants can be used Tools for other refrigerants can be used Tools for other refrigerants can be used Tools for other refrigerants can be used Tools for other refrigerants can be used

Tool exclusive for R410A

Tools and materials Use R410A tools Can R22 tools be used?

(Usable if equipped with adopter for rever se flow)

(Usable by adjusting flaring dimension)

Can R407C tools be used?

Ester oil, ether oil: Alkylbenzene oil: minimum amount

(Usable if equipped with adopter for rever se flow)

(Usable by adjusting flaring dimension)

: Prepare a new tool. (Use the new tool as the tool exclusive for R410A.) : Tools for other refrigerants can be used under certain conditions. : Tools for other refrigerants can be used.

Dimension A

Dimension B

OCH573C

Page 6

2 OVERVIEW OF UNITS

2-1. CONSTRUCTION OF SYSTEM

Outdoor unit

MXZ-4C36NAHZ(-U1) MXZ-5C42NAHZ(-U1)

MXZ-8C48NAHZ(-U1)

MXZ-8C48NA(-U1)

MXZ-8C60NA-U1

4HP 4.5HP 5HP 7HP

Rated capacity

(kBTU/h)

Cooling 36 42 48 60 Heating 45 48 54 66

Refrigerant R410A

Connectable indoor unit

Capacity Type 06 to Type 36

Caution: The indoor unit which rated capacity exceeds

36 kBTU/ h (Type 36) can NOT be connected.

Number of units 2(*

) to 4 units 2(*1) to 5 units 2(*1) to 8 units 2(*1) to 8 units

Total system wide capacity 33 to 130% of outdoor

unit capacity

(12 to 46.8 kBTU/h)

29 to 130% of outdoor

unit capacity

(12 to 54.6 kBTU/h)

25 to 130% of outdoor

unit capacity

(12 to 62.4 kBTU/h)

20 to 130% of outdoor

unit capacity

(12 to 78 kBTU/h)

Connectable branch box

Number of units

1 or 2 units

Connectable indoor unit lineups (Heat pump inverter type)

Model type Model name Capacity class [kBTU/h]

06 09 12 15 18 24 30 36

Wall mounted

Deluxe

MSZ-FE09/12/18NA

MSZ-FH06/09/12/15NA, 18NA2

Designer

MSZ-EF09/12/15/18NA(W/B/S)

Standard

MSZ-GE06/09/12/15/18/24NA

MSZ-GL06/09/12/15/18/24NA

Ceiling concealed

Low static pressure*

SEZ-KD09/12/15/18NA

Middle static pressure*

PEAD-A24/30/36AA5

4-way ceiling cassette

2 by 2 type

SLZ-KA09/12/15NA

Standard

PLA-A12/18/24/30/36BA6

PLA-A12/18/24/30/36EA7*

Floor standing

MFZ-KA09/12/18NA

MFZ-KJ09/12/15/18NA

Multi-position*

MVZ-A12/18/24/30/36AA4

● Models other than MXZ-8C60NA

Number of connecting

multi-position unit

Constraints

Any indoor units other than multi-position models

are not connectable.

None

(Only the ordinal constraints apply.)

Option Optional accessories for indoor units and outdoor units are available.

2- branch pipe (joint): Optional parts In case of using 1- branch box No need In case of using 2- branch boxes

Model name Connection method MSDD-50AR-E are MSDD-50BR-E brazing

Branch box PAC-MKA50BC PAC-MKA51BC PAC-MKA30BC PAC-MKA31BC

Number of branches

(Indoor unit that can be connected)

5 branches

(MAX. 5 units)

3 branches

(MAX. 3 units)

Note: A maximum of 2 branch boxes can be connected to 1 outdoor unit.

● MXZ-8C60NA

(For each connected branch box)

Number of connecting

multi-position unit

Constraints

Any indoor units other than multi-position

models are not connectable.

The total system wide capacity should be 100%

or below including the MVZ-series unit.

· Only 1 SEZ or 1 PEAD can be included in the connection.

*3 For MXZ-8C60NA; When connecting the SEZ and PEAD-series units, the total system wide capacity per 1 branch box should be 100% or

below including the SEZ and PEAD-series units. (Only if connecting to PAC-MKA50/51BC)

*4 When the system includes even 1 unit of PLA-A·EA7, the number of the maximum connectable indoor units is decreased as follows:

3 for MXZ-4C36NAHZ-U1, 4 for MXZ-5C42NAHZ-U1, and 6 for MXZ-8C48NA(HZ)-U1 and MXZ-8C60NA-U1

1 for MVZ model.

Single unit connection is possible with MVZ-series unit.

*2 When connecting a multi-position unit(s), set additional constraints as follows. For connections other than those specied below, consult your dealer.

Select a model according to the connection method.

OCH573C

Page 7

Indoor unit (Ceiling concealed type)

Indoor unit (Wall mounted type)

Outdoor unit

Branch box

2-2. SYSTEM OUTLINE

The additional connection of the branch box together with employment of the compact trunk-looking outdoor unit can successfully realize a long distance piping for large houses. Equipped with a microcomputer, the branch box can translate the transmission signal of indoor units to achieve the optimum control.

2-2-1. System example

2-2-2. Method for identifying

■ Outdoor unit

Development No. : A, B, ···,etc.

Power supply N: Single phase 208/230 V 60Hz

Multi type heat pump inverter outdoor unit

Indicates equivalent to rated cooling capacity. (kBTU/h)

Number of connectable indoor units (MAX.)

Control and refrigerant A : New A control and R410A

Model type

M X Z

4 88 C N A

P A

5 1 B C

H Z

Sub-number

(Indispensable) Optional parts

Model type

Branch box (Controller)

Number of branches 5 : 5 branches

3 : 3 branches

Marketable area A: America, Canada

■ Branch box

OCH573C

Page 8

2-3. TYPICAL COMBINATION EXAMPLE

Branch box is located INSIDE of condominium

Branch box

(Inside)

Installing branch box indoors

Only 1 piping is required between the outdoor and indoor offering a fine external view.

Branch box (5-branches type)

Outdoor unit

SEZ-18 MSZ-12 MSZ-12 MSZ-09 MSZ-09

Living

Dining Bedroom (1) Bedroom (2)

Master bedroom

Indoor unit type (capacity class)

Rated capacity (cooling) (kBTU/h)066

■ System example of 5 indoor units

■ Verification (In case of MXZ-8C48NAHZ)

The rated capacity should be determined by observing the table below. The unit’s quantities are limited to 1(*) to 8 units. For the next step, make sure that the selected total rated capacity is in a range of 12 to 62.4 kBTU/h. The total indoor unit capacity should be within the outdoor units. (= 48.0 kBTU/h is preferred). Combination of excessive indoor units and an outdoor unit may reduce the capacity of each indoor unit. The rated indoor capacity is as the table below. *Single unit connection is possible only with MVZ model. Connect 2 or more units for models other than MVZ.

Example:

Total rated capacity

60 62.4 kBTU/h

MSZ-09 = 9

SEZ-18 = 18

MSZ-12 = 12

MSZ-09 = 9

OCH573C

Page 9

2-4. SIMPLIFIED PIPING SYSTEM

Piping connection size

Liquid

Gas

{3/8 inch

[9.52 mm]

{5/8 inch

[15.88 mm]

The piping connection size differs according to the type and capacity of indoor units. Match the piping connection size of branch box with indoor unit. If the piping connection size of branch box does not match the piping connection size of indoor unit, use optional different-diameter (deformed) joints to the branch box side. (Connect deformed joint directly to the branch box side.)

A B

{3/4 inch*

[19.05 mm]

* MXZ-8C60NA only

Flare connection employed. (No brazing!)

B B B B B

Branch box

■ In case of using 1-branch box Flare connection employed (No brazing)

B B

B B B

2 branches pipe (joint) : optional parts

Branch box #1

Branch box #2

■ In case of using 2-branch boxes

■ Installation procedure (2 branches pipe (joint)) Refer to the installation manuals of MSDD-50AR-E and MSDD-50BR-E.

OCH573C

Page 10

3 SPECIFICATIONS

3-1.

OUTDOOR UNIT

MXZ-4C36/5C42/8C48NAHZ(-U1), MXZ-8C48NA(-U1), MXZ-8C60NA-U1

Conversion formula:

kcal/h = kW o 860 BTU/h = kW o 3412 CFM = m

/min o 35.31

Service Ref. MXZ-4C36NAHZ(-U1) MXZ-5C42NAHZ(-U1)

Standard performance

Indoor type

Non-Ducted

Mix Ducted

Non-Ducted

Mix Ducted

Cooling

Capacity Rated*

BTU/h 36,000 36,000 36,000 42,000 42,000 42,000

Rated power consumption*

W 2,570 2,845 3,180 3,130 3,470 3,890 EER BTU/Wh 14.00 12.65 11.30 13.40 12.10 10.80 SEER BTU/Wh 19.1 17.5 15.8 19.0 17.0 15.0

Heating

Capacity Rated 47°F

BTU/h 45,000 45,000 45,000 48,000 48,000 48,000

Capacity Max. 17°F

BTU/h 45,000 45,000 45,000 48,000 48,000 48,000 Capacity Max. 5°F BTU/h 45,000 45,000 45,000 48,000 48,000 48,000 Rated power consumption 47°F

W 3,340 3,795 4,250 3,430 3,890 4,350

COP 47°F

*1 BTU/Wh 3.95 3.48 3.10 4.10 3.62 3.23

HSPF 4/

BTU/Wh 11.3/9.2 10.7/8.9 10.1/8.5 11.0/9.1 10.6/9.0 10.1/8.8

OUTDOOR UNIT

Connectable indoor units (Max.) 4 5 Max. Connectable Capacity BTU/h 46,000 54,000 Power supply 1 Phase 208/230 V, 60 Hz Breaker Size/Max. fuse size 50 A/52 A

50 A/50 A (for the models with U1) Min. circuit ampacity 42 A Sound level (Cool/Heat) dB 49/ 53 50/ 54 External nish Munsell 3Y 7.8/ 1.1 Refrigerant control Linear Expansion Valve Compressor Hermetic

Model ANB33FJSMT Motor output kW 2.8 3.0

Starting method Inverter Heat exchanger Plate n coil Fan Fan (drive) × No. Propeller fan × 2

Fan motor output kW 0.06 + 0.06

0.074 + 0.074 (for the models with U1)

Airow m³/min

(CFM)

110 (3885)

Dimensions (H × W × D)

in (mm)

41-11/32 (1050)

in (mm)

13+1 (330+25)

in (mm)

52-11/16 (1338) Weight lb (kg) 276 (125) Refrigerant R410A

Charge lb (kg) 10 lbs. 9 oz.(4.8) Oil/Model oz (L) 73 (2.3)/Ethereal oil (FV50S)

Protection devices

High pressure protection HP switch Compressor protection

Compressor thermo, Overcurrent detection

Fan motor protection Overheating/Voltage protection

Guaranteed operation range (cool) D.B 23 to 115°F [ D.B.−5 to 46°C ]

(heat) D.B. −13 to 70°F [D.B. −25 to 21°C ]

REFRIGERANT PIPING

Total Piping length (Max.) ft (m) 492 (150) Farthest ft (m) 262 (80) Max. Height difference ft (m) 164 (50)

Chargeless length ft (m) 0 Piping diameter Liquid

[inch (mm)

[3/8 (9.52)

Gas

[inch (mm)

[5/8 (15.88)

Connection method

Indoor side Flared Outdoor side Flared

Rating conditions Cooling Indoor : D.B. 80°F/W.B. 67 °F [D.B.26.7°C/W.B. 19.4°C]

Outdoor : D.B. 95°F [D.B. 35.0°C]

Heating Indoor : D.B. 70°F [D.B. 21.1°C]

Outdoor : D.B. 47°F/W.B. 43°F [D.B. 8.3°C/W.B. 6.1°C]

Conditions Heating Indoor : D.B. 70°F [D.B. 21.1°C]

Outdoor : D.B. 17°F/W.B. 15°F [D.B. −8.3°C/W.B. −9.4°C]

D.B. 5 to 115°F [D.B. −15 to 46°C], when an optional Air Outlet Guide is installed.

131 ft [40 m], in case of installing outdoor unit lower than indoor unit.

Note: Refer to the indoor unit's service manual for the indoor units specications.

OCH573C

Page 11

Service Ref. MXZ-8C48NAHZ(-U1) MXZ-8C48NA(-U1)

Standard performance

Indoor type

Non-Ducted

Mix Ducted

Non-Ducted

Mix Ducted

Cooling

Capacity Rated*

BTU/h 48,000 48,000 48,000 48,000 48,000 48,000

Rated power consumption*1

W 4,000 4,465 5,050 4,000 4,465 5,050 EER BTU/Wh 12.00 10.75 9.50 12.00 10.75 9.50 SEER BTU/Wh 18.9 16.8 14.7 18.9 16.8 14.7

Heating

Capacity Rated 47°F

BTU/h 54,000 54,000 54,000 54,000 54,000 54,000

Capacity 17°F

BTU/h 54,000 54,000 54,000 36,600 36,600 36,600 Capacity 5°F BTU/h 54,000 54,000 54,000 32,400 32,400 32,400 Rated power consumption 47°F*1

W 4,220 4,605 4,990 4,220 4,605 4,990

COP 47°F

BTU/Wh 3.75 3.44 3.17 3.75 3.44 3.17

HSPF 4/

BTU/Wh 11.0/9.2 10.5/9.2 10.0/9.2 11.4/8.7 10.8/8.6 10.1/8.4

OUTDOOR UNIT

Connectable indoor units (Max.) 8 Max. Connectable Capacity BTU/h 62,000 Power supply 1 Phase 208/230 V, 60 Hz Breaker Size / Max. fuse size 50 A/ 52 A

50 A/50 A (for the models with U1)

40 A/52 A

40 A/50 A (for the models with U1) Min. circuit ampacity 42 A 37 A Sound level (Cool/Heat) dB 51/ 54 External nish Munsell 3Y 7.8 / 1.1 Refrigerant control Linear Expansion Valve Compressor Hermetic

Model ANB33FJSMT ANB33FNHMT Motor output kW 3.4

Starting method Inverter Heat exchanger Plate n coil Fan Fan (drive) × No. Propeller fan × 2

Fan motor output kW 0.06 + 0.06

0.074 + 0.074 (for the models with U1)

Airow m³/min

(CFM)

110 (3885)

Dimensions (H × W × D)

W inch (mm) 41-11/32 (1050)

D inch (mm) 13+1 (330+25)

H inch (mm) 52-11/16 (1338) Weight lb (kg) 276 (125) 269 (122) Refrigerant R410A

Charge lb (kg) 10 lbs. 9 oz. (4.8 )

Oil / Model oz (L) 73 (2.3) / Ethereal oil (FV50S) Protection

devices

High pressure protection HP switch

Compressor protection

Compressor thermo, Over current detection

Fan motor protection Overheating/Voltage protection Guaranteed operation range (cool) D.B. 23 to 115°F [ D.B. −5 to 46°C]

(heat) D.B. −13 to 70°F [D.B. −25 to 21°C] D.B. −4 to 70°F [D.B. −20 to 21°C]

REFRIGERANT PIPING

Total Piping length (Max.) ft (m) 492 (150) Farthest ft (m) 262 (80) Max. Height difference ft (m) 164 (50)

*4 Chargeless length ft (m) 0 Piping diameter Liquid

[inch (mm)

[3/8 (9.52)

Gas

[inch (mm)

[ 5/8 (15.88)

Connection method

Indoor side Flared Outdoor side Flared

Rating conditions Cooling Indoor : D.B. 80°F/W.B. 67°F [D.B. 26.7°C/W.B. 19.4°C]

Outdoor : D.B. 95°F [D.B. 35.0°C]

Heating Indoor : D.B. 70°F [D.B. 21.1°C]

Outdoor : D.B. 47°F/W.B. 43°F [D.B. 8.3°C/W.B. 6.1°C]

Conditions Heating Indoor : D.B. 70°F [D.B. 21.1°C]

Outdoor : D.B. 17°F/W.B. 15°F [D.B. −8.3°C/W.B. −9.4°C]

D.B. 5 to 115°F [D.B. −15 to 46°C], when an optional Air Outlet Guide is installed.

131 ft [40 m], in case of installing outdoor unit lower than indoor unit.

Note: Refer to the indoor unit's service manual for the indoor units specications.

Conversion formula:

kcal/h = kW o 860 BTU/h = kW o 3412 CFM = m

/min o 35.31

OCH573C

Page 12

Service Ref. MXZ-8C60NA-U1

Standard performance

Indoor type

Non-Ducted

Mix Ducted

Cooling

Capacity Rated*

BTU/h 60,000 60,000 60,000

Rated power consumption*

W 4,800 5,525 6,250 EER BTU/Wh 12.50 11.05 9.60 SEER BTU/Wh 17.4 16.3 15.1

Heating

Capacity Rated 47°F

BTU/h 66,000 66,000 66,000

Capacity Max. 17°F

BTU/h 65,000 61,500 58,000 Capacity Max. 5°F BTU/h 57,000 49,500 42,000 Rated power consumption 47°F

W 4,870 4,810 4,750

COP 47°F

*1 BTU/Wh 3.40 3.40 3.40

HSPF 4/

BTU/Wh 10.50/8.50 10.25/8.25 10.00/8.00

OUTDOOR UNIT

Connectable indoor units (Max.) 8 Max. Connectable Capacity BTU/h 78,000 Power supply 1 Phase 208/230 V, 60 Hz Breaker Size/Max. fuse size 50 A/52 A Min. circuit ampacity 46A Sound level (Cool/Heat) dB 58/59 External nish Munsell 3Y 7.8/ 1.1 Refrigerant control Linear Expansion Valve Compressor Hermetic

Model ANB66FFZMT Motor output kW 4.2

Starting method Inverter Heat exchanger Plate n coil Fan Fan (drive) × No. Propeller fan × 2

Fan motor output kW 0.2 + 0.2

Airow m³/min

(CFM)

138 (4879)

Dimensions (H × W × D)

in (mm)

41-11/32 (1050)

in (mm)

13+1 (330+25)

in (mm)

52-11/16 (1338) Weight lb (kg) 309 (140) Refrigerant R410A

Charge lb (kg) 11 lbs. 4 oz.(5.1) Oil/Model oz (L) 73 (2.3)/Ethereal oil (FV50S)

Protection devices

High pressure protection HP switch Compressor protection

Compressor thermo, Overcurrent detection

Fan motor protection Overheating/Voltage protection

Guaranteed operation range (cool) D.B 23 to 115°F [ D.B.−5 to 46°C ]

(heat) D.B. −4 to 70°F [D.B. −20 to 21°C ]

REFRIGERANT PIPING

Total Piping length (Max.) ft (m) 492 (150) Farthest ft (m) 262 (80) Max. Height difference ft (m) 164 (50)

Chargeless length ft (m) 0 Piping diameter Liquid

[inch (mm)

[3/8 (9.52)

Gas

[inch (mm)

[3/4 (19.05)

Connection method

Indoor side Flared Outdoor side Flared

Rating conditions Cooling Indoor : D.B. 80°F/W.B. 67 °F [D.B.26.7°C/W.B. 19.4°C]

Outdoor : D.B. 95°F [D.B. 35.0°C]

Heating Indoor : D.B. 70°F [D.B. 21.1°C]

Outdoor : D.B. 47°F/W.B. 43°F [D.B. 8.3°C/W.B. 6.1°C]

Conditions Heating Indoor : D.B. 70°F [D.B. 21.1°C]

Outdoor : D.B. 17°F/W.B. 15°F [D.B. −8.3°C/W.B. −9.4°C]

D.B. 5 to 115°F [D.B. −15 to 46°C], when an optional Air Outlet Guide is installed.

131 ft [40 m], in case of installing outdoor unit lower than indoor unit.

Note: Refer to the indoor unit's service manual for the indoor units specications.

Conversion formula:

kcal/h = kW o 860 BTU/h = kW o 3412 CFM = m

/min o 35.31

OCH573C

Page 13

inch (mm) inch (mm) inch (mm)

lb (kg)

inch (mm)

inch (mm) inch (mm)

Connectable number of indoor units Power supply Input Running current External finish

Dimensions

Weight

Piping connection (Flare)

Width Depth Height

Branch (indoor side)

Main (outdoor side)

Liquid

Gas

Liquid

Gas

Maximum 3

15 (6.7 )

[1/4 (6.35)

× 3 {A,B,C}

[3/8 (9.52) × 3 {A,B,C}

Maximum 5

16 (7.4)

[1/4 (6.35) × 5 {A,B,C,D,E} [ 3/8 (9.52) × 4 {A,B,C,D},

[ 1/2 (12.7) × 1{E}

PAC-MKA50BC PAC-MKA51BC

PAC-MKA30BC PAC-MKA31BC

Single phase, 208/230 V, 60 Hz

0.003

0.05

Galvanized sheets

17-23/32 (450)

11-1/32 (280) 6-11/16 (170)

[3/8 (9.52)

[ 5/8 (15.88)

Model name

3-2. BRANCH BOX: PAC-MKA50BC PAC-MKA51BC PAC-MKA30BC PAC-MKA31BC

*The piping connection size differs according to the type and capacity of indoor units. Match the piping connection size for indoor

and branch box. If the piping connection size of branch box does not match the piping connection size of indoor units, use optional different-diameter (deformed) joints to the branch box side. (Connect deformed joint directly to the branch box side.)

OCH573C

Page 14

4-1. SELECTION OF COOLING/HEATING UNITS

DATA

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.

Yes

Temporarily select the Indoor/Outdoor Units

Reselect the outdoor units

Reselect the indoor units

Reselect the outdoor units

Reselect the indoor units

Indoor Unit

Total Indoor Units Capacity (CTi) = ∑ (Individual Rated Indoor Unit Capacity CTik ×

k=1

Individual Indoor Temperature Correction Coef.

) (Figure 1, 4)

Outdoor Unit

Outdoor Unit Capacity (CTo) = Rated 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)

Maximum Capacity(CT

max

) = CT

Yes

Completed Selecting Units

Want to change to smaller

indoor units?

Does it fulfill the load of

each room?

≤ CT

L ≤ CT

Maximum Capacity(CT

max

) = CT

L ≤ CT

Need to select smaller

outdoor unit?

Does it fulfill the load of

each room?

Outdoor Unit Input = Rated Outdoor Unit Input ×

ave

Determine the load (L) and the Indoor/Outdoor Temperature

n: Total Number of Indoor Units k: Indoor Unit Number

Yes

Capacity Determination

Input Calculation

Average Indoor temp. power input Coef. (

ave

) Average Indoor temp. power input Coef. (

ave

)

ave

= ∑ {ck × (Mk/ ∑ Mk)}

k=1

ave

= ∑ {ck × (Mk/ ∑ Mk)}

k=1

(If indoor to outdoor connectable capacity ratio is less than 100%, the capacity correction is set as 100% )

*ck:

Outdoor unit power input coefficient of k indoor unit room temp. (Refer to 4-2.)

*Mk:

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

∑ (CT

)

m=1

Individual Indoor Unit Capacity: CT'ik= CT

max

CTik ×

Outdoor Unit Input = Rated Outdoor Unit Input ×

ave

× (CTi )

Completed Selecting Units

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

Yes

OCH573C

Page 15

How to determine the capacity when greater than 100% indoor model size units are connected in total:

Yes

Temporarily select the indoor/outdoor units

Reselect the outdoor units

Reselect the indoor units

Reselect the outdoor units

Reselect the indoor units

Indoor Unit

Total Indoor Units Capacity (CTi) = ∑ (Individual Rated Indoor Unit Capacity CT

k=1

Individual Indoor Temperature Correction Coef.

) (Figure 1, 4)

Outdoor Unit

Maximum Capacity(CT

max

) = CT

Yes

Want to change to smaller

indoor units?

Does it fulfill the load of

each room?

≤ CT

L ≤ CT

Maximum Capacity(CT

max

) = CT

L ≤ CT

Need to select smaller

outdoor unit?

Does it fulfill the load of

each room?

Rated Outdoor Unit Capacity < Total Indoor Units Capacity

Outdoor Unit Input = Rated Outdoor Unit Input × Outdoor Temperature Correction

Coef.

× (CT

)

Determine the load (L) and the Indoor/Outdoor Temperature

n: Total Number of Indoor Units k: Indoor Unit Number

Yes

Average Indoor temp. power input Coef. (

ave

)

= ∑ {c

× (Mk/ ∑ Mk)}

k=1

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.

*ck:

Outdoor unit power input coefficient 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. (

ave

)

ave

= ∑ {ck × (Mk/ ∑ Mk)}

k=1

Outdoor Unit Input =Rated Outdoor Unit Input ×

ave

Outdoor Unit Input = Rated Outdoor Unit Input ×

ave

× (CTi )

∑ (CT

)

m=1

Individual Indoor Unit Capacity: CT'ik= CT

max

CTik ×

Completed Selecting Units

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

Outdoor Unit Capacity (CTo) = Rated Outdoor Unit Capacity × ( )

× Outdoor Temperature Correction Coef. (Figure 2, 5)

× Piping Length Correction Coef. (Figure 3, 6) × Defrost Correction Coef. (in heating, Table 1)

(x) is the approximate correction function when greater than 100%

model size units are input as connected.

(x) is the approximate correction function when less than or equal

100% model size units are input as connected.

× (CTi )

Input Calculation

OCH573C

Page 16

Design Condition

Outdoor Design Dry Bulb Temperature 98.6ºF (37.0ºC) Total Cooling Load 29.6 kBTU/h

Room1

Indoor Design Dry Bulb Temperature 80.6ºF (27.0ºC) Indoor Design Wet Bulb Temperature 68.0ºF (20.0ºC) Cooling Load 13.6 kBTU/h

Room2

Indoor Design Dry Bulb Temperature 75.2ºF (24.0ºC) Indoor Design Wet Bulb Temperature 66.2ºF (19.0ºC) Cooling Load 16.0 kBTU/h

<Other>

Indoor/Outdoor Equivalent Piping Length 250 ft

1. Cooling Calculation

(1) Temporary Selection of Indoor Units

Room1

MSZ-FH15

15.0 kBTU/h (Rated)

Room2

MSZ-FH18

17.2 kBTU/h (Rated)

(2) Total Indoor Units Capacity

15 + 18 = 33

(3) Selection of Outdoor Unit

The P36 outdoor unit is selected as total indoor units capacity is P33

MXZ-4C36

36.0 kBTU/h

(4) Total Indoor Units Capacity Correction Calculation

Room1

Indoor Design Wet Bulb Temperature Correction (68.0ºF)

1.02 (Refer to Figure 1)

Figure 1

Indoor unit temperature correction

To be used to correct indoor unit only

Figure 2 Outdoor unit temperature correction

To be used to correct outdoor unit only

Figure 3

Correction of refrigerant piping length

Room2

Indoor Design Wet Bulb Temperature Correction (66.2ºF)

0.95 (Refer to Figure 1)

CTi = Σ (Indoor Unit Rating × Indoor Design Temperature Correction)

= 15.0 × 1.02 + 17.2 × 0.95 = 31.6 kBTU/h

(5) Outdoor Unit Correction Calculation

Outdoor Design Dry Bulb Temperature Correction (98.6ºF)

0.98 (Refer to Figure 2)

Piping Length Correction (250 ft)

0.93 (Refer to Figure 3)

Total Outdoor Unit Capacity (CTo)

Total Indoor Units Capacity (CTi)

CTo = Outdoor Rating × Outdoor Design Temperature Correction × Piping Length Correction

= 36.0 × 0.98 × 0.93 = 32.8 kBTU/h

(6) Determination of Maximum System Capacity

Comparison of Capacity between Total Indoor Units Capacity (CTi) and Total Outdoor Unit Capacity (CTo)

CTi = 31.6 < CTo = 32.8, thus, select CTi. CTx = CTi = 31.6 kBTU/h

(7) Comparison with Essential Load

Against the essential load 29.6 kBTU/h, the maximum system capacity is 31.6 kBTU/h: Proper outdoor units have been selected.

(8) Calculation of Maximum Indoor Unit Capacity of Each Room

CTx = CTi, thus, calculate by the calculation below

Room1

Indoor Unit Rating × Indoor Design Temperature Correction

= 15.0 × 1.02 = 15.3 kBTU/h

OK: fulfills the load 13.6 kBTU/h

Room2

Indoor Unit Rating × Indoor Design Temperature Correction

= 17.2 × 0.95 = 16.3 kBTU/h OK: fulfills the load 16.0 kBTU/h

Go on to the heating trial calculation since the selected units fulfill the cooling loads of Room 1, 2.

Indoor Temperature

Ratio of cooling capacity

Indoor Temperature

[°F W.B.] [°C W.B.]

-15 -10

-5 0 5 10 15 20 25 30 35 40 45

5 14

23 32 41 50 59 68 77 86 95 104 113

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

Ratio of cooling capacity

Outdoor Temperature

[°C D.B.]

[°F W.B.]

67.0°F(19.4°C) W.B

15 16 17 18 19 20 21 22 23 24

59 60.8 62.6 64.4 66.2 68 69.8 71.6 73.4 75.2

0.4

0.6

0.8

1.0

1.2

0 20 40 60 80 100 120 140 160 180 200 220 240 260

0.70

0.75

0.80

0.85

0.90

0.95

1.00

18 [kBTU/h]

27 [kBTU/h]

36 [kBTU/h]

Capacity ratio

Piping equivalent length (ft)

Total capacity of indoor unit

46.8 [kBTU/h]

Capacity of indoor unit

Model Number for indoor unit

Model 06Model 09Model 12Model 15Model 18Model 24Model 30Model

M series Model Capacity [KBtu/h]

6.0 9.0 12.0

14.0*

15.0*

17.0*3

17.2*

22.5 ─ ─

P series ─ ─ 12.0 ─ 18.0 24.0 30.0 36.0 SEZ ─ 8.1 11.5 14.1 17.2 ─ ─ ─ SLZ ─ 8.4 11.1 15.0 ─ ─ ─ ─ MVZ ─ ─ 12.0 ─ 18.0 24.0 30.0 36.0

*1 For MSZ-GE/GL15NA *

For the models other than

*1 above *3 For MFZ-KA/KJ18NA *

For the models other than

*3 above

OCH573C

Page 17

Design Condition

Outdoor Design W et Bulb Temperature 35.6ºF (2.0ºC) Total Heating Load 34.4 kBTU/h

Room1

Indoor Design Dry Bulb Temperature 69.8ºF (21.0ºC) Heating Load

16.3 kBTU/h

Room2

Indoor Design Dry Bulb Temperature 73.4ºF (23.0ºC) Heating Load

18.1 kBTU/h

<Other>

Indoor/Outdoor Equivalent Piping Length 230 ft

2. Hea ting Calcula tion

(1) Temporary Selection of Indoor Units

Room1

MSZ-FH15 18.0 kBUT/h (Rated)

20.3 kBUT/h (Rated)

Room2

MSZ-FH18

(2) Total Indoor Units Capacity

15 + 18 = 33

(3) Selection of Outdoor Unit

The P36 outdoor unit is selected as total indoor units capacity is P33

MXZ-4C36 45.0 kBUT/h

(4) Total Indoor Units Capacity Correction Calculation

Room1

Indoor Design Dry Bulb Temperature Correction (69.8ºF)

1.00 (Refer to Figure 4)

Room2

Indoor Design Dry Bulb Temperature Correction (73.4ºF)

0.92 (Refer to Figure 4)

CTi = Σ (Indoor Unit Rating × Indoor Design Temperature Correction)

= 18.0 × 1.00 + 20.3 × 0.92 = 36.7 kBTU/h

(5) Outdoor Unit Correction Calculation

Outdoor Design Wet Bulb Temperature Correction (35.6ºF)

1.0 (Refer to Figure 5) Piping Length Correction (230 ft) Defrost Correction

0.96 (Refer to Figure 6)

0.89 (Refer to Table 1)

Total Outdoor Unit Capacity (CTo)

Total Indoor Units Capacity (CTi)

CTo = Outdoor Unit Rating × Outdoor Design Temperature Correction × Piping Length

Correction × Defrost Correction

= 45.0 × 1.0 × 0.96 × 0.89 = 38.4 kBTU/h

(6) Determination of Maximum System Capacity

Comparison of Capacity between Total Indoor Units Capacity (CTi) and Total Outdoor Unit Capacity (CTo)

CTi = 36.7 < CTo = 38.4, thus, select CTi.

CTx = CTi = 36.7 kBTU/h

(7) Comparison with Essential Load

Against the essential load 34.4 kBTU/h, the maximum system capacity is 36.7 kBTU/h: Proper outdoor units have been selected.

(8) Calculation of Maximum Indoor Unit Capacity of Each Room

CTx = CTi, thus, calculate by the calculation below

Room1

Maximum Capacity × Room1 Capacity after the Temperature Correction/(Room1,2 Total Capacity after the Temperature Correction

= 36.7 × (18.0 × 1.00) / (18.0 × 1.00 + 20.3 × 0.92) = 18.0 kBTU/h OK: fulfills the load 16.3 kBTU/h

Room2

Maximum Capacity × Room1 Capacity after the Temperature Correction/(Room1,2 Total Capacity after the Temperature Correction

= 36.7 × (20.3 × 0.92) / (18.0 × 1.00 + 20.3 × 0.92) = 18.7 kBTU/h OK: fulfills the load 18.1 kBTU/h

Completed selecting units since the selected units fulfill the heating loads of Room 1, 2.

Figure 4 Indoor unit temperature correction

To be used to correct indoor unit only

Figure 5 Outdoor unit temperature correction

To be used to correct outdoor unit only

Figure 6 Correction of refrigerant piping length

-4 5 14 23 32 41 50 59

-25

-20 -15 -10 -5 0 5 10 15

0.4

0.5

0.6

0.7

0.8

0.9

0.8

0.5

0.6

0.7

1.0

1.1

1.2

1.0

1.1

1.3

1.4

Ratio of heating capacity

Outdoor Temperature [°C W.B.]

70.0°F (21.1°C) D.B

15 16 17 18 19 20 21 22 23 24 25 26 27

59 60.8 62.6 64.4 66.2 68 69.8 71.6 73.4 75.2 77 78.8 80.6

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

Ratio of heating capacity

Indoor Temperature

[°C D.B.]

[°F W.B.]

[°C D.B.]

[°F W.B.]

Indoor Temperature

0 20 40 60 80 100 120 140 160 180 200 220 240 260

0.70

0.75

0.80

0.85

0.90

0.95

1.00

Total capacity of indoor unit

Capacity ratio

Piping equivalent length (ft)

Table 1 Table of correction factor at frost and defrost

Outdoor Intake temperature <W.B.°F (°C)>

43(6) 37(4) 36(2) 32(0) 28(−2) 25(−4) 21(−6) 18(−8) 14(−10) 5(−15) −4(−20) −13(−25)

Correction factor

1.0 0.98 0.89 0.88 0.89 0.9 0.95 0.95 0.95 0.95 0.95 0.95

Capacity of indoor unit

Model Number for indoor unit

Model 06Model 09Model 12Model 15Model 18Model 24Model 30Model

M series Model Capacity [KBtu/h]

6.0 10.9

13.6*

14.4*

13.0*

20.3*

21.6*

21.0*

27.6 ─ ─

P series ─ ─ 13.5 ─ 18.0 26.0 34.0 40.0 SEZ ─ 10.9 13.6 18.0 17.2 ─ ─ ─ SLZ ─ 10.2 13.7 17.1 ─ ─ ─ ─ MVZ ─ ─ 12.0 ─ 18.0 27.0 34.0 40.0

*1 For MSZ-FH/FE12,18NA *

For MSZ-GE/GL12,18NA

For the models other than

*1 and

*2 above

OCH573C

Page 18

n: Total number of the indoor units k: Number of the indoor unit c

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

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

3. Power input of outdoor unit

Outdoor unit : MXZ-4C36 Indoor unit 1 : MSZ-FH15 Indoor unit 2 : MSZ-FH18

(1) Rated power input of outdoor unit 2.57 kW

1.04 (Refer to “4-2. CORRECTING BY TEMPERATURE”.)

(2) 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. 68.0°F [20.0°C] W.B.)

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

Total Indoor units capacity 15 + 18 = 33, thus, (CTi) = 0.9 (Refer to the tables in “4-4.STANDARD CAPACITY DIAGRAM”.)

PIo = Outdoor unit Cooling Rated Power Input × Correction Coefficient of Indoor temperature × (CTi) = 2.57 × 0.94 × 0.9 = 2.2 kW

0.85 (Refer to “4-2. CORRECTING BY TEMPERATURE”.)

Coefficient of th

e 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.)

= 1.04 × 15/(15 + 18) + 0.85 × 18/(15 + 18) = 0.94

k=1

Average indoor temp. power input coefficient (

ave

)

= ∑ {ck × (Mk/ ∑ Mk)}

(4) Outdoor power input (PIo)

(3) Coefficient of the partial load (CTi)

OCH573C

Page 19

n: Total number of the indoor units k: Number of the indoor unit c

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

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

(1) Rated power input of outdoor unit 3.34 kW

1.34 (Refer to “4-2. CORRECTING BY TEMPERATURE”.)

(2) Calculation of the average indoor temperature power input coefficient

Coefficient of the outdoor unit for indoor unit 1 (Outdoor temp. 26.6°F [−3°C] W.B., Indoor temp. 68.0°F [20°C] D.B.)

Maximum System Capacity (CTx) = Total Indoor unit Capacity (CTi), so use the following formula PIo = Outdoor unit Heating Rated Power Input × Correction Coefficient of Indoor temperature × (CTi) = 3.34 × 1.20 × 0.9 = 3.61 kW

1.09 (Refer to “4-2. CORRECTING BY TEMPERATURE”.)

Coefficient of the outdoor unit for indoor unit 2 (Outdoor temp. 26.6°F [−3°C] W.B., Indoor temp. 77.0°F [25°C] D.B.)

= 1.34 × 15/(15 + 18) + 1.09 × 18/(15 + 18) = 1.20

k=1

Average indoor temp. power input coefficient (

ave

)

= ∑ {ck × (Mk/ ∑ Mk)}

(4) Outdoor power input (PIo)

(3) Coefficient of the partial load (CTi)

Total indoor units capacity 15 + 18 = 33, thus, (CTi) = 0.9 (Refer to the tables in “4-4. STANDARD CAPACITY TEMPERATURE”.)

OCH573C

Page 20

4-2. CORRECTING BY TEMPERATURE

15 16 17 18 19 20 21 22 23 24

59 60.8 62.6 64.4 66.2 68 69.8 71.6 73.4 75.2

0.4

0.6

0.8

1.0

1.2

Ratio of cooling capacity

Indoor Temperature

[°CW.B.]

[°FW.B.]

5 14

23 32 41 50 59 68 77 86 95 104 113

-15 -10

-5 0 5 10 15 20 25 30 35 40 45

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

Ratio of cooling capacity

Outdoor Temperature

67.0°F (19.4°C) W.B.

[°C W.B.]

[°F W.B.]

-15 -10

-5 0 5 10 15 20 25 30 35 40 45

5 14

23 32 41 50 59 68 77 86 95 104 113

0.0

0.2

0.4

0.6

0.8

1.0

1.2

Ratio of power input

Outdoor Temperature

[°C W.B.]

[°F W.B.]

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

71.6°F (22.0°C) W.B.71.6°F (22.0°C) W.B.

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

64.4°F (18.0°C) W.B.64.4°F (18.0°C) W.B.

60.8°F (16.0°C) W.B.60.8°F (16.0°C) W.B.

MXZ-4C36/5C42/8C48NA(HZ), 8C60NA could have varied capacity at different designing temperature. Using the nominal cooling/heating capacity value and the ratio below, the capacity can be observed at various temperature.

MXZ

4C36 5C42

Nominal cooling capacity

BTU/h 36,000 48,000

Input kW 2.57 3.13

Figure 7 Indoor unit temperature correction

To be used to correct indoor unit capacity only

Figure 8 Outdoor unit temperature correction

To be used to correct outdoor unit capacity only

Indoor Temperature

MXZ

8C48 8C60

Nominal cooling capacity

BTU/h 48,000 60,000

Input kW 4.00 4.80

OCH573C

Page 21

15 16 17 18 19 20 21 22 23 24 25 26 27

59 60.8 62.6 64.4 66.2 68 69.8 71.6 73.4 75.2 77 78.8 80.6

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

Ratio of heating capacity

Indoor Temperature

[°C W.B.]

[°F W.B.]

-25

-20 -15 -10 -5 0 5 10

-13

-4 5 14 23 3 41 50

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

Ratio of heating capacity

Outdoor Temperature

[°C W.B.]

[°F W.B.]

70.0°F (21.1°C) D.B.

-25

-20 -15 -10 -5 0 5 10

-13

-4 5 14 23 3 41 50

0.0

0.2

0.4

1.0

0.6

0.8

1.2

1.4

Ratio of power input

Outdoor Temperature

[°C W.B.]

[°F W.B.]

70.0°F (21.1°C) D.B.

60.8°F (16.0°C) D.B.

78.8°F (26.0°C) D.B.

Figure 9 Indoor unit temperature correction

To be used to correct indoor unit capacity only

Figure 10 Outdoor unit temperature correction

To be used to correct outdoor unit capacity only

MXZ

8C48NA 8C60NA

Nominal heating capacity

BTU/h 54,000 66,000

Input kW

4.22 5.67

Indoor Temperature

OCH573C

Page 22

<Heating> (NAHZ)

15 16 17 18 19 20 21 22 23 24 25 26 27

59 60.8 62.6 64.4 66.2 68 69.8 71.6 73.4 75.2 77 78.8 80.6

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

Ratio of heating capacity

Indoor Temperature

[°C W.B.]

[°F W.B.]

-25

-20 -15 -10 -5 0 5 10

0.4

1.3

-13

-4 5 14 23 3 41 50

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.4

Ratio of heating capacity

Outdoor Temperature

[°C W.B.]

[°F W.B.]

70.0°F (21.1°C) D.B.

Ratio of power input

Outdoor intake air dry-bulb temperature

-13 -14 5 14 23 32 41 50 59

-25

-20 -15 -10 -5 0 5 10

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

[°C W.B.]

[°F W.B.]

60.8°F (16.0°C) W.B.

69.8°F (21.0°C) W.B.

78.8°F (26.0°C) W.B.

Figure 11 Indoor unit temperature correction

To be used to correct indoor unit capacity only

Figure 12 Outdoor unit temperature correction

To be used to correct outdoor unit capacity only

MXZ

4C36NAHZ 5C42NAHZ 8C48NAHZ

Nominal heating capacity

BTU/h 45,000 48,000 54,000

Input kW

3.34 3.43 4.22

Indoor Temperature

OCH573C

Page 23

Operation

Outdoor unit model

MXZ-4C36NAHZ MXZ-5C42NAHZ

Operating conditions

Ambient temperature

Indoor

DB/WB

80°F/67°F 70°F/60°F 80°F/67°F 70°F/60°F

Outdoor 95°F/75°F 47°F/43°F 95°F/75°F 47°F/43°F

Indoor unit

No. of connected units

Unit

4 4

No. of units in operation

4 4

Model — 09 × 4 09 × 2 + 12 ×2

Piping

Main pipe

9.84 (3) 9.84 (3)

Branch pipe 14.76 (4.5) 14.76 (4.5) Total pipe length 68.90 (21) 68.90 (21)

Fan speed — Hi Hi

Amount of refrigerant

lb oz

(kg)

17 lb 7 oz (7.9) 17 lb 7 oz (7.9)

Outdoor unit

Electric current A 14.1 18.7 17.2 19.1 Voltage V 230 230 Compressor frequency Hz 59 74 70 80

LEV opening

Indoor unit Pulse 112 128 129 128

Pressure High pressure/Low pressure

MPaG 2.57/0.98 2.78/0.64 2.72/0.80 2.80/0.56

PSIG 373/142 403/93 395/116 406/81

Temp. of each section

Outdoor unit

Discharge

°F

[°C]

143.8 [62.1] 151.5 [66.4] 148.6 [64.8] 145.8 [63.2]

Heat exchanger outlet 100.8 [38.2] 36.7 [2.6] 101.8 [38.8] 35.6 [2.0] Accumulator inlet 50.5 [10.3] 36.1 [2.3] 49.5 [9.7] 34.9 [1.6] Compressor inlet 47.1 [8.4] 34.0 [1.1] 45.3 [7.4] 32.7 [0.4]

Indoor unit

LEV inlet 70.0 [21.1] 103.5 [39.7] 83.7 [28.7] 100.2 [37.9] Heat exchanger inlet 54.1 [12.3] 138.9 [59.4] 49.6 [9.8] 132.3 [55.7]

4-3. STANDARD OPERATION DATA (REFERENCE DATA)

Operation

Outdoor unit model

MXZ-8C48NA/NAHZ MXZ-8C60NA

Operating conditions

Ambient temperature

Indoor

DB/WB

80°F/67°F 70°F/60°F 80°F/67°F 70°F/60°F

Outdoor 95°F/75°F 47°F/43°F 95°F/75°F 47°F/43°F

Indoor unit

No. of connected units

Unit

4 5

No. of units in operation

4 5

Model — 12 × 4 09 × 3 + 15 + 18

Piping

Main pipe

9.84 (3) 9.84 (3)

Branch pipe 14.76 (4.5) 14.76 (4.5) Total pipe length 68.90 (21) 83.79 (25.5)

Fan speed — Hi Hi

Amount of refrigerant

lb oz

(kg)

17 lb 7 oz (7.9) 20 lb (8.9)

Outdoor unit

Electric current A 22.1 21.9 20.4 24.4 Voltage V 230 230 Compressor frequency Hz 86 91 45 51

LEV opening

Indoor unit Pulse 11 2 132 187 229

Pressure High pressure/Low pressure

MPaG 2.83/0.77 2.82/0.55 2.84/0.92 2.44/0.672

PSIG 410/112 409/80 412/134 354/97.5

Temp. of each section

Outdoor unit

Discharge

°F

[°C]

157.6 [69.8] 149.2 [65.1] 167 [75.0] 133.9 [56.6]

Heat exchanger outlet 105.6 [40.9] 34.3 [1.3] 98.8 [37.1] 51.1 [10.2] Accumulator inlet 47.1 [8.4] 33.4 [0.8] 49.5 [9.7] 32.4 [0.2] Compressor inlet 42.4 [5.8] 30.6 [−0.8] 72.5 [22.5] 31.6 [−0.2]

Indoor unit

LEV inlet 71.1 [21.7] 98.8 [37.1] 59.7 [15.4] 81.9 [27.7] Heat exchanger inlet 47.5 [8.6] 134.6 [57.0] 52.5 [11.4] 104.2 [40.1]

OCH573C

Page 24

4-4. STANDARD CAPACITY DIAGRAM

Before calculating the sum of total capacity of indoor units, please convert the value into the kW model capacity following the formula on "4-1. Method for obtaining system cooling and heating capacity".

4-4-1. MXZ-4C36NAHZ <cooling>

Ratio of capacity

Total capacity of indoor units (kBTU/h)

Ratio of power inputRatio of current

Total capacity of indoor units (kBTU/h)

40 50

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

0 10 20

40 50

0.0

0.2

0.4

0.6

0.8

1.0

0 10 20

40 50

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

MXZ

4C36NAHZ Nominal cooling capacity BTU/h 36,000 Input kW 2.57 Current (208V) A 12.8 Current (230V) A 11.6

208, 230 V

OCH573C

Page 25

4-4-2. MXZ-4C36NAHZ <heating>

MXZ

4C36NAHZ Nominal cooling capacity BTU/h 45,000 Input kW 3.34 Current (208V) A 16.4 Current (230V) A 14.8

Total capacity of indoor units (kBTU/h)

40 50

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

0 10 20

40 50

0.0

0.2

0.4

0.6

0.8

1.0

0 10 20

40 50

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

Ratio of capacity

Ratio of power inputRatio of current

208, 230 V

OCH573C

Page 26

4-4-3. MXZ-5C42NAHZ <cooling>

Total capacity of indoor units (kBTU/h)

40 50

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

0 10 20

40 50

0.0

0.2

0.4

0.6

0.8

1.0

1.2

0 10 20

40 50

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

Ratio of capacity

Ratio of power inputRatio of current

MXZ

5C42NAHZ Nominal cooling capacity BTU/h 42,000 Input kW 3.13 Current (208V) A 15.4 Current (230V) A 14.0

208, 230 V

OCH573C

Page 27

4-4-4. MXZ-5C42NAHZ <heating>

MXZ

5C42NAHZ Nominal cooling capacity BTU/h 48,000 Input kW 3.43 Current (208V) A 16.8 Current (230V) A 15.2

Total capacity of indoor units (kBTU/h)

0 10 20

40 50

0.0

0.2

0.4

0.6

0.8

1.0

1.2

0.0 7.5 15.0 22.5

30.0

37.5 45.0 52.5

60.0

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

0.0 7.5 15.0 22.5

30.0

37.5 45.0 52.5

60.0

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

Ratio of capacity

Ratio of power inputRatio of current

208, 230 V

OCH573C

Page 28

4-4-5. MXZ-8C48NA MXZ-8C48NAHZ <cooling>

Total capacity of indoor units (kBTU/h)

Ratio of capacity

Ratio of power inputRatio of current

0 10 20

40 50

0.0

0.2

0.4

0.6

0.8

1.0

1.2

0 10 20 30 40 50

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

0 10 20 30 40 50

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

MXZ

8C48NAHZ Nominal cooling capacity BTU/h 48,000 Input kW 4.00 Current (208V) A 19.5 Current (230V) A 17.6

208, 230 V

OCH573C

Page 29

4-4-6. MXZ-8C48NA MXZ-8C48NAHZ <heating>

Total capacity of indoor units (kBTU/h)

Ratio of capacity

Ratio of power inputRatio of current

0 10 20

40 50

0.0

0.2

0.4

0.6

0.8

1.0

1.2

0 10 20

40 50

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

0 10 20

40 50

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

MXZ

8C48NA(HZ) Nominal cooling capacity BTU/h 54,000 Input kW 4.22 Current (208V) A 20.5 Current (230V) A 18.6

208, 230 V

OCH573C

Page 30

4-4-7. MXZ-8C60NA <cooling>

0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0

0.0

0.2

0.4

0.6

0.8

1.0

1.2

0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0

0.0

0.2

0.4

0.6

0.8

1.0

0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0

0.0

0.2

0.4

0.6

0.8

1.0

Total capacity of indoor units(kBTU/h)

Ratio of capacity

Ratio of power inputRatio of current

MXZ

8C60NA Nominal cooling capacity BTU/h 60,000 Input kW 4.80 Current (208V) A 24.1 Current (230V) A 21.8

208, 230 V

OCH573C

Page 31

4-4-8. MXZ-8C60NA <heating>

0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0

0.0

0.2

0.4

0.6

0.8

1.0

1.2

0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0

0.0

0.2

0.4

0.6

0.8

1.0

1.2

0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0

0.0

0.2

0.4

0.6

0.8

1.0

1.2

208 V, 230 V

Total capacity of indoor units(kBTU/h)

Ratio of capacity

Ratio of power inputRatio of current

MXZ

8C60NA Nominal cooling capacity BTU/h 66,000 Input kW 5.67 Current (208V) A 28.5 Current (230V) A 25.7

208, 230 V

OCH573C

Page 32

4-5.

CORRECTING CAPACITY FOR CHANGES IN THE LENGTH OF REFRIGERANT PIPING

(1) During cooling, obtain the ratio (and the equivalent piping length) of the outdoor units rated capacity and the total in-use

indoor capacity, and find the capacity ratio corresponding to the standard piping length from Figure 13 to 18. Then multiply by the cooling capacity from Figure 7 and 8 in "4-2. CORRECTION BY TEMPERATURE" to obtain the actual capacity.

(2) During heating, find the equivalent piping length, and find the capacity ratio corresponding to standard piping length from

Figure 17. Then multiply by the heating capacity from Figure 9 to 12 in "4-2. CORRECTION BY TEMPERATURE" to obtain the actual capacity.

(1) Capacity Correction Curve

0 20 40 60 80 100 120 140 160 180 200 220 240 260

0.70

0.75

0.80

0.85

0.90

0.95

1.00

0 20 40 60 80 100 120 140 160 180 200 220 240 260

0.70

0.75

0.80

0.85

0.90

0.95

1.00

18 [kBTU/h]

27 [kBTU/h]

36 [kBTU/h]

Capacity ratio

Piping equivalent length (ft)

Total capacity of indoor unit

Capacity ratio

Piping equivalent length (ft)

46.8 [kBTU/h]

21 [kBTU/h]

31.5 [kBTU/h]

42 [kBTU/h]

54.6 [kBTU/h]

Figure 13 MXZ-4C36NAHZ <Cooling>

Figure 14 MXZ-5C42NAHZ <Cooling>

OCH573C

Page 33

0 20 40 60 80 100 120 140 160 180 200 220 240 260

0.70

0.75

0.80

0.85

0.90

0.95

1.00

Total capacity of indoor unit

Capacity ratio

Piping equivalent length (ft)

24 [kBTU/h]

36 [kBTU/h]

48 [kBTU/h]

62.4 [kBTU/h]

0 20 40 60 80 100 120 140 160 180 200 220 240 260

0.70

0.75

0.80

0.85

0.90

0.95

1.00

Total capacity of indoor unit

Capacity ratio

Piping equivalent length (ft)

30 [kBTU/h]

45 [kBTU/h]

60 [kBTU/h]

78 [kBTU/h]

Figure 15 MXZ-8C48NA <Cooling>

Figure 16 MXZ-8C60NA <Cooling>

OCH573C

Page 34

Figure 17 MXZ-4C36NAHZ/5C42NAHZ/8C48NA <Heating>

Figure 18 MXZ-8C60NA <Heating>

(2) Method for Obtaining the Equivalent Piping Length

Equivalent length for type P60 = (length of piping to farthest indoor unit) + (0.3 o number of bends in the piping) (m)

Length of piping to farthest indoor unit: type P60.....80 m

4-5-1. 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 <W.B.°F (°C)>

43(6) 39(4) 36(2) 32(0) 28(−2) 25(−4) 21(−6) 18(−8) 14(−10) 5(−15) −4(−20) −13(−25)

Correction factor

1.0 0.98 0.89 0.88 0.89 0.9 0.95 0.95 0.95 0.95 0.95 0.95

0 20 40 60 80 100 120 140 160 180 200 220 240 260

0.70

0.75

0.80

0.85

0.90

0.95

1.00

Total capacity of indoor unit

Capacity ratio

Piping equivalent length (ft)

0 20 40 60 80 100 120 140 160 180 200 220 240 260

0.70

0.75

0.80

0.85

0.90

0.95

1.00

Total capacity of indoor unit

Capacity ratio

Piping equivalent length (ft)

OCH573C

Page 35

4-6. NOISE CRITERION CURVES

5 ft

(1.5 m)

3.3 ft (1 m)

MICROPHONE

UNIT

GROUND

63 125 250 500 1000 2000 4000 8000

APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE

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

BAND CENTER FREQUENCIES, Hz

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

MXZ-5C42NAHZ MXZ-5C42NAHZ-U1

COOLING

MODE

HEATING

SPL(dB)

LINE

63 125 250 500 1000 2000 4000 8000

APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE

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

BAND CENTER FREQUENCIES, Hz

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

MXZ-8C48NA MXZ-8C48NA-U1 MXZ-8C48NAHZ MXZ-8C48NAHZ-U1

COOLING

MODE

HEATING

SPL(dB)

LINE

63 125 250 500 1000 2000 4000 8000

APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE

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

BAND CENTER FREQUENCIES, Hz

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

MXZ-4C36NAHZ MXZ-4C36NAHZ-U1

COOLING

MODE

HEATING

SPL(dB)

LINE

63 125 250 500 1000 2000 4000 8000

APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE

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

BAND CENTER FREQUENCIES, Hz

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

MXZ-8C60NA-U1

COOLING

MODE

HEATING

SPL(dB)

LINE

OCH573C

Page 36

5 OUTLINES AND DIMENSIONS

5-1. OUTDOOR UNIT

MXZ-4C36NAHZ MXZ-5C42NAHZ MXZ-8C48NAHZ MXZ-8C48NA

Air Discharge

Rear Air Intake

Side Air Intake

2-12×36 Oval holes

(Foundation Bolt M10<W3/8>)

2-U Shaped notched holes

(Foundation Bolt M10<W3/8>)

Installation Feet

42<1-21/32>

56<2-7/32>

370 <14-9/16>

25<1>

417 <16-13/32>

<2-3/4>

28<1-3/32>

225

<8-27/32>

225

<8-27/32>

330 <13>

600

<23-5/8>

19<3/4>

56<2-7/32>

33.2 <1-5/16>053<2-3/32>

1/2 inch Conduit

attachment

{

22.2<7/8>

{

34.5<1-23/64>

When installing the conduit.

Set the attachment to the

inner side of each panel.

1 inch Conduit

attachment

Scale 1:5

24.7 <31/32>

5<3/16>

60<2-3/8> 24 <15/16>

101.5 <4>

Ground for the

branch box

power supply

For the

power supply

For the

branch box

power supply

For the

transmission line

For concentration

control

Terminal connection

From left to right

Handle for moving

Ground for the transmission line

Ground for concentration control

Handle for moving

Service panel

Ground for the power supply

("GR"marking position)

632 <24-7/8>

1338 <52-11/16>

26<1-1/32>

1050 <41-11/32>

1067 <42>

426 <16-25/32> *

369 <14-17/32>

362 <14-1/4>

510 <20-3/32> *

Rear piping cover

Front piping cover

Air intake

Bottom piping hole

(Knockout)

Drain hole

(5-

{

33<1-5/16>)

160

<6-5/16>

110 <4-11/32>

160

<6-5/16>

160

<6-5/16>

136

<5-11/32>

86<3-3/8>

81<3-3/16>

45<1-25/32>

154

<6-1/16>

Right piping hole

(Knockout)

Conduit hole

(

{

24<15/16>Knockout)

Conduit hole

(

{

37<1-15/32>Knockout)

Right trunking hole

(Knockout)

92<3-5/8>

60<2-3/8>

5<3/16>

60<2-3/8>

55<2-3/16>

53<2-3/32>

<3-5/8>

26<1-1/32> 27 <1-1/16>

29<1-5/32>

73<2-7/8>

{

<3-5/8>

Min. 150mm<5-29/32>Min. 1000mm<39-3/8>

Side Air Intake

Conduit hole

(

{

37<1-15/32>Knockout)

Front trunking hole

(Knockout)

Front piping hole

(Knockout)

Conduit hole

(

{

24<15/16>Knockout)

55<2-3/16>

27<1-1/16>

92<3-5/8>

75<2-15/16>

73<2-7/8>26<1-1/32>

55<2-3/16>

<2-3/8>

<3/16>

60<2-3/8>

{

<3-5/8>

FREE

Min. 15mm<19/32>

Handle for

moving

Handle for

moving

Rear Air Intake

Conduit hole

(

{

24<15/16>Knockout)

Conduit hole

(

{

37<1-15/32>Knockout)

Rear trunking hole

(Knockout)

Rear piping hole

(Knockout)

75<2-15/16>

60<2-3/8>

92<3-5/8>

73<2-7/8>

26<1-1/32>

27<1-1/16>

55<2-3/16>

5<3/16>

60<2-3/8>

{

<3-5/8>

1……

Refrigerant GAS pipe connection (FLARE){15.88 (5/8F)

2……

Refrigerant LIQUID pipe connection (FLARE){9.52 (3/8F)

.......

Indication of STOP VALVE connection location.

Piping and wiring connections

can be made from 4 directions:

FRONT, Right, Rear and Below.

4 PIPING-WIRING DIRECTIONS

3 FOUNDATION BOLTS

2 SERVICE SPACE

1 FREE SPACE (Around the unit)

Please secure the unit firmly

with 4 foundation (M10<W3/8>) bolts.

(Bolts and washers must be

purchased locally.)

Dimensions of space needed

for service access are

shown in the below diagram.

The diagram below shows a basic example.

Explantion of particular details are

given in the installation manuals etc.

Max.

FOUNDATION

Service space

Min.

15<19/32>

500

<19-11/16>

500

<19-11/16>

150

<5-29/32>

30<1-3/16>

Piping Knockout Hole Details

Example of Notes

mm<inch>

Unit: mm <inch>

OCH573C

Page 37

MXZ-4C36NAHZ-U1 MXZ-5C42NAHZ-U1 MXZ-8C48NAHZ-U1 MXZ-8C48NA-U1

2-12×36 Oval holes

(Foundation Bolt M10<W3/8>)

2-U Shaped notched holes

(Foundation Bolt M10<W3/8>)

Installation Feet

Air Discharge

Rear Air Intake

Side Air Intake

417 <16-13/32>

<2-3/4>

225

<8-27/32>

600

<23-5/8>

225

<8-27/32>

330 <13>25<1>

<1-21/32>

60.5 <2-3/8>

28 <1-3/32> 370 <14-9/16> 19 <3/4>

39.5 <1-9/16>

56 <2-7/32>

53 <2-3/32>

Drain hole

(5-

{

33<1-5/16>)

Bottom piping hole

(Knock-Out)

154

<6-1/16>

136

<5-11/32>

<1-25/32>

110

<4-11/32>

160

<6-5/16>

160

<6-5/16>

160

<6-5/16>

<3-3/16>

86 <3-3/8>

Rear piping cover

Front piping cover

Air intake

Ground for the

branch box

power supply

For the

power supply

For the

branch box

power supply

For the

transmission line

For concentration

control

Terminal connection

From left to right

Handle for moving

Ground for the transmission line

Ground for concentration control

Handle for moving

Service panel

Ground for the power supply

("GR"marking position)

26 <1-1/32>

1050 <41-11/32>

362 <14-1/4>

1338 <52-11/16>

632 <24-7/8>369 <14-17/32>

485 <19-3/32>

426 <16-25/32>

1067 <42>

Side Air Intake

Handle for

moving

Rear Air Intake

Handle for

moving

{15.88 (5/8F)

{9.52(3/8F)

Example of Notes

Rear piping hole

(Knock-Out)

Rear trunking hole

(Knock-Out)

Conduit hole

(

{

37<1-15/32>Knock-Out)

Conduit hole

(

{

24<15/16>Knock-Out)

60<2-3/8>

5<3/16>

55<2-3/16>

55<2-3/16>27<1-1/16>

26<1-1/32> 73<2-7/8>

92<3-5/8>

60<2-3/8>

75<2-15/16>

{

<3-5/8>

Conduit hole

(

{

24<15/16>Knock-Out)

Front piping hole

(Knock-Out)

Front trunking hole

(Knock-Out)

Conduit hole

(

{

37<1-15/32>Knock-Out)

60<2-3/8>

<3/16>

<2-3/8>

55<2-3/16>

26<1-1/32> 73<2-7/8>

75<2-15/16>

92<3-5/8>

27<1-1/16> 55<2-3/16>

{

<3-5/8>

Right trunking hole

(Knock-Out)

Conduit hole

(

{

37<1-15/32>Knock-Out)

Conduit hole

Right piping hole

(Knock-Out)

73<2-7/8>

29<1-5/32>

27<1-1/16>26<1-1/32>

<3-5/8>

53<2-3/32>

55<2-3/16>

60<2-3/8>

5<3/16>

60<2-3/8>

92<3-5/8>

{

<3-5/8>

Scale 1:5

1 inch Conduit

attachment

When installing the conduit.

Set the attachment to the

inner side of each panel.

{

34.5<1-23/64>

{

22.2<7/8> 1/2 inch Conduit

attachment

101.5 <4>

24<15/16>60 <2-3/8>

5<3/16>

24.7 <31/32>

mm<inch>

Piping Knock-Out Hole Details

Min.

Service space

FOUNDATION

Max.

Dimensions of space needed

for service access are

shown in the below diagram.

Please secure the unit firmly

with 4 foundation (M10<W3/8>) bolts.

(Bolts and washers must be

purchased locally.)

Piping and wiring connections

can be made from 4 directions:

FRONT, Right, Rear and Below.

1 FREE SPACE (Around the unit)

2 SERVICE SPACE

3 FOUNDATION BOLTS

4 PIPING-WIRING DIRECTIONS

30<1-3/16>

150

<5-29/32>

500

<19-11/16>

500

<19-11/16>

15<19/32>

Min. 15mm<19/32>

FREE

Min. 1000mm<39-3/8> Min. 150mm<5-29/32>

The diagram below shows a basic example.

Explantion of particular details are

given in the installation manuals etc.

(

{

24<15/16>Knock-Out)

Unit: mm <inch>

OCH573C

Page 38

MXZ-8C60NA-U1

Ground for the power supply

("GR"marking position)

Service panel

Handle for moving

Ground for the transmission line

Ground for concentration control

Handle for moving

From left to right

Terminal connection

For concentration

control

For the

transmission line

For the

branch box

power supply

For the

power supply

Ground for the

branch box

power supply

1067 <42>

450 <17-23/32>

393 <15-15/32>

1338 <52-11/16>

632 <24-7/8>369 <14-17/32>

26 <1-1/32>

362 <14-1/4>

1050 <41-11/32>

Rear Air Intake

Air Discharge

Side Air Intake

Installation Feet

2-U Shaped notched holes

(Foundation Bolt M10<W3/8>)

2-12×36 Oval holes

(Foundation Bolt M10<W3/8>)

<1-21/32>

60.5 <2-3/8>

417 <16-13/32>

19 <3/4>370 <14-9/16>

28 <1-1/32>

<2-3/4>

25 <1> 330 <13>

225

<8-27/32>

600

<23-5/8>

225

<8-27/32>

53 <2-3/32>

56 <2-7/32>

39.5 <1-9/16>

Bottom piping hole

(Knock-Out)

Drain hole

(5-

{33<1-5/16>)

154

<6-1/16>

136

<5-11/32>

<1-25/32>

110

<4-11/32>

160

<6-5/16>

160

<6-5/16>

160

<6-5/16>

86 <3-3/8>

<3-3/16>

Air intake

Front piping cover

Rear piping cover

Side Air Intake

Rear Air Intake

Handle for

moving

Handle for

moving

{19.05 (3/4F)

{9.52(3/8F)

Example of Notes

1/2 inch Conduit

attachment

{

22.2<7/8>

{

34.5<1-23/64>

When installing the conduit.

Set the attachment to the

inner side of each panel.

1 inch Conduit

attachment

Scale 1:5

24.7 <31/32>

5<3/16>

60<2-3/8> 24 <15/16>

101.5 <4>

Right piping hole

(Knock-Out)

Conduit hole

(

{

24<15/16>Knock-Out)

Conduit hole

(

{

37<1-15/32>Knock-Out)

Right trunking hole

(Knock-Out)

92<3-5/8>

60<2-3/8>

5<3/16>

60<2-3/8>

55<2-3/16>

53<2-3/32>

<3-5/8>

26<1-1/32> 27 <1-1/16>

29<1-5/32>

73<2-7/8>

{

<3-5/8>

Conduit hole

(

{

37<1-15/32>Knock-Out)

Front trunking hole

(Knock-Out)

Front piping hole

(Knock-Out)

Conduit hole

(

{

24<15/16>Knock-Out)

55<2-3/16>27<1-1/16>

92<3-5/8>

75<2-15/16>

73<2-7/8>26 <1-1/32>

55<2-3/16>

<2-3/8>

<3/16>

60<2-3/8>

{

<3-5/8>

Conduit hole

(

{

24<15/16>Knock-Out)

Conduit hole

(

{

37<1-15/32>Knock-Out)

Rear trunking hole

(Knock-Out)

Rear piping hole

(Knock-Out)

75<2-15/16>

60<2-3/8>

92<3-5/8>

73<2-7/8>26<1-1/32>

27<1-1/16> 55 <2-3/16>

55<2-3/16>

5<3/16>

60<2-3/8>

{

<3-5/8>

Piping Knock-Out Hole Details

mm<inch>

Min. 150mm<5-29/32>Min. 1000mm<39-3/8>

FREE

Min. 15mm<19/32>

Piping and wiring connections

can be made from 4 directions:

FRONT, Right, Rear and Below.

4 PIPING-WIRING DIRECTIONS

3 FOUNDATION BOLTS

2 SERVICE SPACE

1 FREE SPACE (Around the unit)

Please secure the unit firmly

with 4 foundation (M10<W3/8>) bolts.

(Bolts and washers must be

purchased locally.)

Dimensions of space needed

for service access are

shown in the below diagram.

The diagram below shows a basic example.

Explantion of particular details are

given in the installation manuals etc.

Max.

FOUNDATION

Service space

Min.

15<19/32>

500

<19-11/16>

500

<19-11/16>

150

<5-29/32>

30<1-3/16>

Unit: mm <inch>

OCH573C

Page 39

Unit: mm <inch>

5-2. BRANCH BOX PAC-MKA50BC PAC-MKA51BC

PAC-MKA30BC PAC-MKA31BC

E D C B A

TO INDOOR UNIT

〈3-17/32〉

〈2-3/4〉

450〈17-23/32〉

67〈2-9/16〉

〈1〉

〈2-9/16〉

47〈1-27/32〉

170〈6-11/16〉

〈2-27/32〉

[

22〈7/8〉

(1:2)

When installing the conduit.

Set the attachment to the inner side of each panel.

1/2 inch Conduit attachment

129〈5-3/32〉

17〈21/32〉

48〈1-7/8〉 48〈1-7/8〉

〈15/16〉

66〈2-19/32〉

15〈19/32〉

12〈15/32〉

105

〈4-1/8〉

〈15/16〉

58〈2-9/32〉

〈25/32〉

〈1-3/32〉

SUSPENSION BOLT PITCH

320〈12-19/32〉

12〈1/2〉

24〈1〉

402〈15-13/16〉

5-ELECTRIC WIRE INLET

CONDUIT PLATE

CONTROL COVER

SERVICE PANEL (for LEV, THERMISTOR)

TO OUTDOOR UNIT

40〈1-17/32〉280〈11-1/32〉

〈3-9/32〉

〈3-25/32〉

112

〈4-3/8〉

〈2-3/4〉

〈3-7/16〉

EDCBA

LIQUID PIPE

TO OUTDOOR UNIT

5/8F1/2F3/8F3/8F

3/8F

3/8F1/4F1/4F1/4F1/4F1/4F

REFRIGERANT PIPE FLARED CONNECTION

GAS PIPE

SUSPENSION BOLT : W3/8(M10)

TB3B TB3D

TB3A TB3C TB3E

TB5

TB2B

TERMINAL BLOCK TO OUTDOOR UNIT

TERMINAL BLOCK TO INDOOR UNIT

TERMINAL BLOCK TO M-NET UNIT

Unit: inch

TO INDOOR UNIT

ABC

CAP

〈1〉

〈2-27/32〉

〈3-17/32〉

170〈6-11/16〉

47〈1-27/32〉

〈2-9/16〉

〈1〉

〈2-3/4〉

209〈8-7/32〉

450〈17-23/32〉

SUSPENSION BOLT PITCH

320〈12-19/32〉

402〈15-13/16〉

24〈1〉

12〈1/2〉

1/2 inch Conduit attachment

When installing the conduit. Set the attachment to the inner side of each panel.

(1:2)

5-{ 22〈7/8〉

〈1-3/32〉

〈25/32〉

58〈2-9/32〉

〈15/16〉

105

〈4-1/8〉

12〈15/32〉

15〈19/32〉

66〈2-19/32〉

〈15/16〉

48〈1-7/8〉48〈1-7/8〉

17〈21/32〉

129〈5-3/32〉

5-ELECTRIC WIRE INLET

CONDUIT PLATE

CONTROL COVER

TO OUTDOOR UNIT

SERV ICE PANEL

(for LEV, THERMISTOR)

40〈1-17/32〉

280〈11-1/32〉

〈3-7/16〉70〈2-3/4〉

〈3-9/32〉

〈3-25/32〉

112

〈4-3/8〉

TERMINAL BLOCK TO M-NET UNIT

TERMINAL BLOCK TO INDOOR UNIT

TERMINAL BLOCK TO OUTDOOR UNIT

TB2B

TB5

TB3B

TB3CTB3A

SUSPENSION BOLT : W3/8(M10)

GAS PIPE

REFRIGERANT PIPE FLARED CONNECTION

1/4F 1/4F 1/4F 3/8F 3/8F

3/8F

3/8F 5/8F

TO OUTDOOR UNIT

LIQUID PIPE

A B C

Unit: inch

OCH573C

Page 40

6 WIRING DIAGRAM

6-1. OUTDOOR UNIT MXZ-4C36NAHZ MXZ-5C42NAHZ MXZ-8C48NAHZ

MODELS

MXZ-4C36NAHZ

MXZ-5C42NAHZ

MXZ-8C48NAHZ

SW4

※1 MODEL SELECTION

The black square（）indicates a switch position.

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

SW2 SW8

OFF

1 2

OFF

1 2

OFF

1 2

OFF

5 6

OFF

5 6

OFF

5 6

SYMBOL NAME SYMBOL NAME SYMBOL NAME

TB1 Terminal Block 〈Power Supply〉 TB1B Terminal Block 〈Branch Box〉 TB3 Terminal Block

〈

Branch box/Outdoor Transmission Line

〉

Terminal Block

〈

Centralized Control Transmission Line

〉

TB7

FUSE1,FUSE2

Fuse 〈

T20AL250V

〉

MC Motor For Compressor MF1,MF2 Fan Motor 21S4 Solenoid Valve〈Four-Way Valve〉

SV1

Solenoid Valve〈Bypass Valve〉

SV2

Solenoid Valve〈Switching Valve〉

BH Base heater

TH3

Thermistor〈Outdoor Liquid Pipe〉

TH2

Thermistor〈Hic Pipe〉

TH4

Thermistor〈Compressor〉

TH6

Thermistor〈Suction Pipe〉

TH7 Thermistor〈Ambient〉

63H High Pressure Switch 63HS High Pressure Sensor 63LS Low Pressure Sensor

DCL P.B. Power Circuit Board

Connection Terminal〈Ground〉

Connection Terminal〈U/V/W-Phase〉

U/V/W

MULTI.B.

Fuse〈T6,3AL250V〉

F1,F2

Switch〈Display Selection〉

SW1

Switch〈Function Selection〉

SW2

Switch〈Test Run〉

SW3

Switch〈Model Selection〉

SW4

Switch〈Function Selection〉

SW5

Switch〈Function Selection〉

SW6

Switch〈Model Selection〉

SW8

Switch〈Function Selection〉

SW9

Switch〈Unit Address Selection, 1st digit〉

SWU1

Switch〈Unit Address Selection, 2nd digit〉

SWU2

LED〈Operation Inspection Display〉

LED1,LED2

LED〈Power Supply to Main Microcomputer〉

LED3

Controller Circuit Board

Connector〈Base heater〉

Connector〈Connection For Option〉

CN3D

Connector〈

Branch box/Outdoor Transmission Line

〉

CNS1

Connector〈

Centralized Control Transmission Line

〉

CNS2

Connector〈Connection For Option〉

CN3S

Connector〈Connection For Option〉

CN3N

Connector〈Connection For Option〉

CN51

Relay

X501〜505

M-NET P.B.

ConnectionTerminal〈Ground〉

M-NET Power Circuit Board

TB1

Connection Terminal〈L-Phase〉

Connection Terminal〈N-Phase〉

EI,E2,E3,E4

Power Module

IGBT

Connection Terminal〈Reactor〉

DCL1,DCL2

Reactor

LEV-A,LEV-B

Electronic Expansion Valve

Switch〈Function Selection〉

SW7

TH8 Thermistor〈Heat Sink〉

RED

YLW

P. B.

BLK

WHT

UVVWW

RED

MS 3〜

TB3

TO BRANCH BOX CONNECTING WIRES DC 30V(Non-polar)

TO BRANCH BOX

FOR CENTRALIZED CONTROL DC 30V(Non-polar)

TB7

GRN/YLW

BLU

RED

POWER SUPPLY 〜208 / 230V 60Hz

TB1

CN51

（WHT）

SW6

SW2SW8SW1

SW7SW3SW4

※1

※1 ※1

SW5

SWU2 SWU1

SW9

TRANS

LED1

CN2

（RED）

CN4

（WHT）

LED3

CN3D

（WHT）

CN3S

（RED）

CN3N

（BLU）

CN1

（WHT）

ＴB1

BLK

CNDC

（PNK）

t゜ t゜ t゜ t゜

MF1 MS

3〜

LEV-B

1 41

1 3 1 3 1 3

CN52C

（RED）

1 3

2 21 11 2

TH7 TH6 TH3 TH4

63HS

63H

CNF1

（WHT）

MF2 MS

3〜

CNF2

（WHT）

TH7/6

（RED）

CNLVB

（RED）

TH3

（WHT）

TH4

（WHT）

t゜

TH2

t゜

TH8

TH2

（BLK）

63HS

（WHT）

63LS

（BLU）

63H

（YLW）

MULTI. B.

LED2

M-NET P.B.

52C

（BLK）

X505

21S4

（GRN）

SV1

（GRY）

SV2

（BLU）

（WHT）

21S4

SV1

CNAC

（RED）

CNS1

（RED）

CNS2

（YLW）

X504

X503

X502

X501

CN102

（WHT）

CN2

（WHT）

411

CN40

（WHT）

5 3

CN41

（WHT）

SV2

CN2

（RED）

CN4

（WHT）

CNDC

（PNK）

3 1

TB1B

FUSE1

〜

DCL

DCL2 DCL1

IGBT

E I

E 4

CNAC1

（WHT）

L I

N I

BLK

CNAC2

（RED）

BLK

is the switch position.

LEV-A

CNLVA

（WHT）

CN52C

（RED）

52C

BLK

FUSE2

OCH573C

Page 41

MODELS

MXZ-8C48NA

SW4 SW8

※1 MODEL SELECTION

The black square（）indicates a switch position.

OFF

1 2 3 4 5 6

OFF

1 2

SW2

OFF

5 6

SYMBOL NAME SYMBOL NAME SYMBOL NAME

TB1 Terminal Block 〈Power Supply〉 TB1B Terminal Block 〈Branch Box〉

FUSE1,FUSE2

Fuse 〈

T20AL250V

〉

MC Motor For Compressor MF1,MF2 Fan Motor

LEV-A,LEV-B

Electronic Expansion Valve

21S4 Solenoid Valve〈Four-Way Valve〉

SV1 Solenoid Valve〈Bypass Valve〉

TH3

Thermistor〈Outdoor Liquid Pipe〉

TH2

Thermistor〈Hic Pipe〉

TH4 Thermistor〈Compressor〉 TH6 Thermistor〈Suction Pipe〉

TH7 TH8

Thermistor〈Ambient〉 Thermistor〈Heat Sink〉

63H High Pressure Switch 63HS High Pressure Sensor 63LS Low Pressure Sensor

DCL P.B. Power Circuit Board

Connection Terminal〈Ground〉

Connection Terminal〈U/V/W-Phase〉

U/V/W

MULTI.B.

Fuse〈T6,3AL250V〉

F1,F2

Switch〈Display Selection〉

SW1

Switch〈Function Selection〉

SW2

Switch〈Test Run〉

SW3

Switch〈Model Selection〉

SW4

Switch〈Function Selection〉

SW5

Switch〈Function Selection〉

SW6

Switch〈Model Selection〉

SW8

Switch〈Function Selection〉

SW9

Switch〈Unit Address Selection, 1st digit〉

SWU1

Switch〈Unit Address Selection, 2nd digit〉

SWU2

LED〈Operation Inspection Display〉

LED1,LED2

LED〈Power Supply to Main Microcomputer〉

LED3

Controller Circuit Board

Connector〈Connection For Option〉

CN3D

Connector〈

Branch box/Outdoor Transmission Line

〉

CNS1

Connector〈

Centralized Control Transmission Line

〉

CNS2

Connector〈Connection For Option〉

CN3S

Connector〈Connection For Option〉

CN3N

Connector〈Connection For Option〉

CN51

Relay

X501〜505

M-NET P.B.

ConnectionTerminal〈Ground〉

M-NET Power Circuit Board

TB1

Connection Terminal〈L-Phase〉

Connection Terminal〈N-Phase〉

EI,E2,E3,E4

Power Module

IGBT

Connection Terminal〈Reactor〉

DCL1,DCL2

Reactor

Switch〈Function Selection〉

SW7

TB3 Terminal Block

〈

Branch box/Outdoor Transmission Line

〉

Terminal Block

〈

Centralized Control Transmission Line

〉

TB7

RED

YLW

P. B.

BLK

WHT

UVVWW

RED

MS 3〜

TB3

TO BRANCH BOX CONNECTING WIRES DC 30V(Non-polar)

TO BRANCH BOX

FOR CENTRALIZED CONTROL DC 30V(Non-polar)

TB7

GRN/YLW

BLU

RED

POWER SUPPLY 〜 208 / 230V 60Hz

TB1

CN51

（WHT）

SW6

SW2SW8SW1

SW7SW3SW4

※1

※1 ※1

SW5

SWU2 SWU1

SW9

TRANS

LED1

CN2

（RED）

CN4

（WHT）

LED3

CN3D

（WHT）

CN3S

（RED）

CN3N

（BLU）

CN1

（WHT）

ＴB1

BLK

CNDC

（PNK）

t゜ t゜ t゜ t゜

MF1

3〜

LEV-B

1 41

1 3 1 3 1 3

CN52C

（RED）

1 3

2 21 11 2

TH7 TH6 TH3 TH4

63HS

63H

CNF1

（WHT）

MF2

3〜

CNF2

（WHT）

TH7/6

（RED）

CNLVB

（RED）

TH3

（WHT）

TH4

（WHT）

t゜

TH2

t゜

TH8

TH2

（BLK）

63HS

（WHT）

63LS

（BLU）

63H

（YLW）

MULTI. B.

LED2

M-NET P.B.

52C

（BLK）

X505

21S4

（GRN）

SV1

（GRY）

SV2

（BLU）

（WHT）

21S4

SV1

CNAC

（RED）

CNS1

（RED）

CNS2

（YLW）

X504

X503

X502

X501

CN102

（WHT）

CN2

（WHT）

411

CN40

（WHT）

5 3

CN41

（WHT）

CN2

（RED）

CN4

（WHT）

CNDC

（PNK）

3 1

TB1B

FUSE1

〜

DCL

DCL2 DCL1

IGBT

E I

E 4

CNAC1

（WHT）

L I

N I

BLK

CNAC2

（RED）

BLK

is the switch position.

LEV-A

CNLVA

（WHT）

CN52C

（RED）

52C

BLK

FUSE2

MXZ-8C48NA

OCH573C

Page 42

MXZ-4C36NAHZ-U1 MXZ-5C42NAHZ-U1 MXZ-8C48NAHZ-U1

OCH573C

Page 43

MXZ-8C48NA-U1

OCH573C

Page 44

MXZ-8C60NA-U1

OCH573C

Page 45

6-2. BRANCH BOX PAC-MKA50BC PAC-MKA30BC

10ths

DIGIT

OCH573C

Page 46

PAC-MKA51BC PAC-MKA31BC

<Note>

1. At servicing for outdoor unit,

always follow the wiring diagram

of outdoor unit.

2. Caution for electrical work.

• Use copper supply wires.

(Utilisez des fils d’alimentation en cuivre.)

3. When work to supply power

separately to Branch box and outdoor

units are applied, refer to Fig. 1.

4. For the connection method, please

refer to the Branch box Installation

Manual.

: Terminal block, : Connector

: Dip switch (■(black square) indicates

a switch position)

TO OUTDOOR UNIT

LEV-E

LEV-D

LEV-C

LEV-B

LEV-A

TH-E

tº

TH-DtºTH-CtºTH-B

tº

TH-A

tº

1 2 3 45 6

SW5

OFF

10s

DIGIT

INDOOR UNIT-E

INDOOR UNIT-D

INDOOR UNIT-C

INDOOR UNIT-B

INDOOR UNIT-A

S3S2S1

TO OUTDOOR UNIT

DC24-30V

TB3E

TB3C

TB3A

TB3D

TB3B

10A 250V

TB2B

TB1

TB5

(SHIELD)

CND

(BK)

6.3A 250V

–

M-NET

CN3M

(BU)

LEV-E

(GN)15

LEV-D

(BK)15

LEV-C

(BU)15

LEV-B

(RD)15

LEV-A

(WH)

2 TH-E

1 (GN)

2 TH-D

1 (BK)

2 TH-C

1 (BU)

2 TH-B

1 (RD)

2 TH-A

1 (WH)

(PAC-MKA51BC only)

SW12

SW11

OFF

1 2 3 4 5 6 7 89

SW4

1 2 3 45 6

SW1

OFF

LED1

LED2

CNM

(WH)

B.C.

(PAC-MKA51BC only)

TO ANOTHER

BRANCH BOX

TO ANOTHER

BRANCH BOX

POWER SUPPLY

208/230V AC 60Hz

TB2B

ANOTHER

BRANCH

BOX

CIRCUIT

BREAKER

Fig. 1

PULL

BOX

PULL

BOX

123

Indoor unit-D Indoor unit-E

Enter the location of combined indoor units with model name in each

blank below because it is necessary for service and maintenance.

SYMBOL

B.C.

LEV-A~E

TH-A~E

TB2B

TB5

Branch box controller board

Fuse <UL 6.3A 250V AC>

Fuse <UL 10A 250V AC>

Switch for indoor unit connection

Switch for function selection

Connector <Connection for service>

Light emitting diode

Terminal block <To Indoor unit-A~E>

Address Setting ones digit

Address Setting tens digit

Linear expansion valve

Thermistor <Gas pipe>

Terminal block <To Power Supply>

Transmission line

NAME

Indoor unit-A Indoor unit-B Indoor unit-C

3 LED on Branch box controller board for service

After each indoor unit is connected to the outdoor unit, turn on

the switch corresponding to each indoor unit. For example,

when the indoor units are connected to INDOOR UNIT-A

and C, turn SW1-1 and SW1-3 to on.

• start-up

Mark

LED 1

LED 2

Main power supply

Meaning

Main power supply (208/230V)

Power on → Lamps are lit

Function

Mark

LED 2 Total number of

indoor units

Meaning

Blink depend on the total number

<example> The total number is 2

1 Blink 2 times.

2 Turn off for 3 sec.

3 Repeat 1 to 2.

LED 1 Main power supply Lamp is lit

Function

• normal operating

4 D and E for PAC-MKA51BC only.

PAC-MKA

51BC only

INDOOR UNIT-A

INDOOR UNIT-B

INDOOR UNIT-C

INDOOR UNIT-D

INDOOR UNIT-E

NO USE

SW1-1

SW1-2

SW1-3

SW1-4

SW1-5

SW1-6

NOT CONNECT

CONNECT

OFF ON

1 F4 for PAC-MKA51BC only

2 SW1 setting

F2~F4

SW1

SW4

SW5

CNM

LED1,2

TB3A~E

SW11

SW12

OCH573C

Page 47

NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION

7-1. TRANSMISSION SYSTEM SETUP

Branch box

001

Branch box

006

Indoor unit

(001)

Indoor unit

(002)

Indoor unit

(003)

Indoor unit

(006)

Indoor unit

(007)

Indoor unit

(008)

Indoor unit

(004)

Indoor unit

(005)

M-NET cable

①

M-NET cable shielding wire must

be connected to each refrigerant

system (outdoor and branch box).

② Set addresses :

Outdoor unit ............ 051–100

Branch box ............... 001–046

③ MXZ-4C/5C/8Chas no 100s digit

switch. The address automatically

become "100" if it is set as "01–50".

Piping

Signal line

④ Make sure that the wiring between the

branch box and indoor unit is properly

done, matching with the piping connection.

A B C D E A B C

MA remote

controller

MA remote

controller

MA remote

controller

MA remote

controller

RC RC RC RC

For centralized

management

051

Outdoor unit

Piping

For Branch box

Address SW

SW1

1 2 3 4 5 6

SW1

1 2 3 4 5 6

⑤

M-NET remote controller cannot be connected

with refrigerant system including branch box.

⑥

Refrigerant systems including branch box cannot be

grouped with using M-NET remote controller or

system controller.

OCH573C

Page 48

Distributor

Service port

Ball valve

Strainer

4-Way Valve (21S4)

Accumulator

High pressure

switch(63H)

Compressor

LEV-A

LEV-B

HIC

Oil separator

Solenoid valve(SV1)

Stop valve

Service port

Low pressure sensor(63LS)

Capillary

tube1

Thermistor(TH4)

Thermistor(TH6)

Thermistor(TH2)

Refrigerant flow in cooling

Room temperature thermistor (TH1or RT11)

Condenser / evaporator temperature thermistor

Pipe temperature thermistor (TH2 or RT13)

LEV-A~E (Linear expansion)

Thermistor(TH-A–E) <Gas pipe temperature>

Service port

Strainer

StrainerStrainer

Solenoid valve(SV2)

Strainer

Service port

High

pressure

sensor(63HS)

Thermistor(TH7)

Thermistor(TH3)

Thermistor(TH8)

Refrigerant flow in cooling Refrigerant flow in heating

Branch box

Strainer

Capillary tube2

Indoor

Outdoor unit

PAC-MKA30BC PAC-MKA31BC

Outdoor unit

MXZ-4C36NAHZ(-U1) MXZ-5C42NAHZ(-U1) MXZ-8C48NAHZ(-U1)

PAC-MKA50BC PAC-MKA51BC

Branch box

Capillary tube 1

(For return of oil from oil separator)

Capillary tube 2 behind LEV

(in cooling mode)

[0.098 o [0.031 o L(39-1/2)

([2.5 o [0.8 o L1000)

([0.157 o [0.117 o L(5-1/8)) o 5

(([4 o [3.0 o L130) o 5)

([0.157 o [0.117 o L(5-1/8)) o 3

(([4 o [3.0 o L130) o 3)

Unit: inch (mm)

MXZ-4C36NAHZ MXZ-5C42NAHZ MXZ-8C48NAHZ MXZ-4C36NAHZ-U1 MXZ-5C42NAHZ-U1 MXZ-8C48NAHZ-U1

MXZ-8C48NA MXZ-8C48NA-U1

Distributor

Service port

Ball valve

Strainer

4-Way Valve (21S4)

Accumulator

High pressure

switch(63H)

Compressor

LEV-A

LEV-B

HIC

Oil separator

Solenoid valve(SV1)

Stop valve

Service port

Low pressure sensor(63LS)

Capillary

tube1

Thermistor(TH4)

Thermistor(TH6)

Thermistor(TH2)

Refrigerant flow in cooling

Room temperature thermistor (TH1 or RT11)

Condenser / evaporator temperature thermistor

Pipe temperature thermistor (TH2 or RT13)

LEV-A~E (Linear expansion)

Thermistor(TH-A–E) <Gas pipe temperature>

Service port

Strainer

StrainerStrainer

Strainer

Service port

High

pressure

sensor(63HS)

Thermistor(TH7)

Thermistor(TH3)

Thermistor(TH8)

Refrigerant flow in cooling Refrigerant flow in heating

Branch box

Strainer

Capillary tube2

Indoor

Outdoor unit

MXZ-8C48NA(-U1)

PAC-MKA50BC PAC-MKA51BC

PAC-MKA30BC PAC-MKA31BC

Branch box

Capillary tube 1

(For return of oil from oil separator)

Capillary tube 2 behind LEV

(in cooling mode)

[0.098 o [0.031 o L(39-1/2)

([2.5 o [0.8 o L1000)

([0.157 o [0.117 o L(5-1/8)) o 5

(([4 o [3.0 o L130) o 5)

([0.157 o [0.117 o L(5-1/8)) o 3

(([4 o [3.0 o L130) o 3)

Unit: inch (mm)

7-2. REFRIGERANT SYSTEM DIAGRAM

OCH573C

Page 49

MXZ-8C60NA-U1

Distributor

Service port

Ball valve

Strainer

4-Way Valve (21S4)

Accumulator

High pressure

switch(63H)

Compressor

LEV-A

LEV-B

HIC

Oil separator

Solenoid valve(SV1)

Stop valve

Service port

Low pressure sensor(63LS)

Capillary

tube1

Capillary

tube2

Thermistor(TH4)

Thermistor(TH6)

Thermistor(TH2)

Refrigerant flow in cooling

Room temperature thermistor (TH1 or RT11)

Condenser / evaporator temperature thermistor

Pipe temperature thermistor (TH2 or RT13)

LEV-A~E (Linear expansion)

Thermistor(TH-A–E) <Gas pipe temperature>

Service port

Strainer

StrainerStrainer

Strainer

Service port

High

pressure

sensor(63HS)

Thermistor(TH7)

Thermistor(TH3)

Thermistor(TH8)

Refrigerant flow in cooling Refrigerant flow in heating

Branch box

Strainer

Capillary tube3

Indoor

Outdoor unit

MXZ-8C60NA-U1

PAC-MKA50BC PAC-MKA51BC

PAC-MKA30BC PAC-MKA31BC

Branch box

Capillary tube 1

(For return of oil from oil separator)

Capillary tube 3 behind LEV

(in cooling mode)

[0.098 o [0.031 o L(39-1/2)

([2.5 o [0.8 o L800)

([0.157 o [0.117 o L(5-1/8)) o 5

(([4 o [3.0 o L130) o 5)

([0.157 o [0.117 o L(5-1/8)) o 3

(([4 o [3.0 o L130) o 3)

Capillary tube 2

(For solenoid valve (SV1))

[4.0 o [3.0 o L500

Unit: inch (mm)

OCH573C

Page 50

TB7

TB3

(51)

TB7

(53)

Power Supply

Unit

System controller

M1M2

TB3

M1M2

TB3A

A-IC (01)

A-IC (02)

A-IC (03)

A-IC (04)

A-IC

MA-RC

WL-RC

(05)

A-IC (06)

A-IC

(07)

A-IC

(08)

TB5/TB15

12A

TB5/TB15

TB3B

TB3C

TB3D

TB3E

TB3A

TB3B

TB3C

TB5

(01)

(06)

Branch Box

IMPORTANT: Make sure that the current leakage breaker is one compatible with higher harmonics. Always use a current leakage breaker that is compatible with higher harmonics as this unit is equipped with an inverter. The use of an inadequate breaker can cause the incorrect operation of inverter.

Longest length via outdoor units: L1 + L2 + L3 + L4 + L5

500 m (1640 ft.) (1.25 mm2 or more) Longest transmission cable length L1 + L2, L3 + L4, L5

200 m (656 ft.) (1.25 mm2 or more)

7-3. TYPICAL CONTROL SYSTEM

Note: M-NET remote controller cannot be connected with a refrigerant system which includes branch box.

(1) Difference between display and operation

When operating the system using the system controller, details of those operations will not appear on the display of the

wireless remote controller.

The set temperature range is different in the wireless remote controller that comes with room air conditioner and the system

controller. The room air conditioner has a wider range. If the target temperature is set to below 63-F [17:] or less, or 86-F [30:] or more by the wireless remote controller that comes with room air conditioner, the temperature displayed on the system controller may be converted to their maximum/minimum set temperature. For instance, when HEAT operation at 61-F[16:] is set at the room air conditioner, the system controller may display 63-F [17:].

When the DRY mode is set with the wireless remote controller, the room air conditioner automatically set the optimum

target temperature. The system controller will display the target temperature as a set temperature.

When the DRY mode is set with the system controller, the room air conditioner performs the DRY mode control operation

according to the temperature set with the system controller.

(2) Timer operation

Timer operation should be set using only one controller from the remote controller that comes with the room air conditioner,

the system controller or the MA remote controller. If more than one controller is used to set the timer at the same time, the timer will not function properly.

When the timer is set with the wireless remote controller; the system controller will not show the timer display.

The timer set with the system controller will not be cancelled with the wireless remote controller.

(3) Manual operation prohibition

When the manual operation (ON/OFF, set temperature, or operation mode) is prohibited with the system controller, the

command to perform the prohibited operation will not be accepted from the wireless remote controller that comes with the room air conditioner. The operation partially enabled by the system controller can be operated with the wireless remote controller. Regardless of whether the operation is disabled or enabled, 3 short beeps will sound when the signal is sent from the wireless remote controller.

(4) Trouble

If the MA remote controller or the system controller shows the abnormal indication, clear it by stopping the operation with

one of the following: the MA remote controller, the system controller, or the wireless remote controller. (Abnormal indication of the air conditioner could be recovered automatically, but that of the MA remote controller or the system controller cannot be recovered unless the operation is stopped.)

OCH573C

Page 51

(

5) Group setting

MA group or M-NET group setting cannot be set.

(6) Restricted functions

The following functions of system controller cannot be used.

• DIDO controller (Interlock with the air conditioner)

• Fan control of energy saving control or peak cut control function

• Air conditioning charge [TG-2000A]

• Set temperature range limiting function

• Operation mode changeover limit (season changing) [PAC-SF44SRA]

• Dual set point function

• Setback mode

• Hold function

OCH573C

Page 52

8 TROUBLESHOOTING

Present and past check codes are logged, and they can be displayed on the wired remote controller and multi controller circuit board of outdoor unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field, are summarized in the table below. Check the contents below before investigating details.

8-1. TROUBLESHOOTING

Unit conditions at service

Check code

Actions to be taken for service (summary)

The trouble has reoccurred.

Displayed

Not displayed

Judge what is wrong and take a corrective action according to “8-3 SELF-DIAGNOSIS ACTION BY FLOWCHART”.

Conduct troubleshooting and ascertain the cause of the trouble according to “8-4. TROUBLESHOOTING BY INFERIOR PHENOMENA”.

The trouble is not reoccurring.

Logged

Not logged

1Consider the temporary defects such as the work of protection devices in the refrigerant circuit including compressor, poor connection of wiring, noise, etc. Re-check the symptom, and check the installation environment, refrigerant amount, weather when the trouble occurred, matters related to wiring, etc.

Reset check code logs and restart the unit after finishing

service. 3There is no abnormality concerning of parts such as

electrical component, controller board, remote controller,

etc.

1Re-check the abnormal symptom. 2Conduct troubleshooting and ascertain the cause of the

trouble

according to “8-4. TROUBLESHOOTING

BY INFERIOR PHENOMENA

”.

3Continue to operate unit for the time being if the cause is not ascertained.

There is no abnormality concerning of parts such as electrical component, controller board, remote controller, etc.

OCH573C

Page 53

8-2. CHECK POINTS FOR TEST RUN

8-2-1. 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 and electrical wiring are 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 side for full 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 settled.

(2) Safety check :

With the insulation tester of 500V, 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 under 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: Turn the power supply switch of the outdoor unit to on for compressor protection. For a test run, wait at least 12 hours from this point. (4) More than 12 hours later from power supply to the outdoor unit, turn all power switch to on for the test run. Perform test run according to the “Operation procedure” table of the bottom of this page. While test running, make test run reports .

OCH573C

Page 54

F1 F2 F3 F4

unem ecivreS

rosruC

:unem niaM

Test run Input maintenance info. Function setting Check Self check

F1 F2 F3 F4

Test run menu

Cursor

Service menu:

Test run Drain pump test run

Select "Service" from the Main menu, and press the button.

Select "Test run" with the F1 or F2 button, and press the button.

Select "Test run" with the F1

or F2 button, and press the button.

F1 F2 F3 F4

Cool

Pipe

Auto

Switch disp.

Mode Fan

RemainTest run

F1 F2 F3 F4

Remain

Vane

Cool mode: Check the cold air blow out. Heat mode: Check the heat blow out.

Press the F1

button to go through the operation modes in the order of

"Cool and Heat".

Check the auto vane with the F1

F2 buttons.

Check the operation of the outdoor unit fan, also.

Press the

button to return to “Test run operation”.

Press the

button.

When the test run is completed, the “Test run menu” screen will appear. The test run will automatically stop after 2 hours. *The function is available only for the model with vanes.

Test run operation

Auto vane check*

Press the button and open the Vane setting screen.

Function buttons

F1 F2 F3 F4

MENU RETURN SELECT ON/OFF

8-2-2. Test run for wired remote controller <PAR-31MAA>

OCH573C

Page 55

• Be sure to perform the test run individually for each indoor unit. Make sure each indoor unit operates properly following the

installation manual attached to the unit. If you perform the test run for indoor units connected all at once, faulty connections of the refrigerant pipes and cables cannot be detected.

• The compressor operation is not available for 3 minutes at least after the power is supplied.

• The compressor can emit noise just after turn on the power supply or in case of low outside air temperature.

About the restart protective mechanism

Once the compressor stops, the restart preventive device operates so the compressor will not operate for 3 minutes to protect the air conditioner.

8-2-3. Test run (1) Using remote controller

Refer to the indoor unit installation manual.

OCH573C

Page 56

● Setting procedure

The setting of test run (ON/OFF) and its operation mode (cooling/heating) can be set by SW3 on the multi controller circuit board of outdoor unit.

1 Set operation mode (cooling or heating) by SW3-2. 2 Start test run by setting SW3-1 to ON (

) with the indicated operation mode of SW3-2.

3 Finish test run by setting SW3-1 to OFF ( ).

• Operation mode cannot be changed by SW3-2 during test run.

• To change the test run operation mode, stop the test run by 3-1, and restart test run by SW3-1 after the mode is changed by SW3-2.

• Test run automatically stops 2 hours later by 2-hour OFF timer function.

• Test run can be performed by the remote controller.

• The remote controller display of test run by outdoor unit is the same as that of test run by remote controller.

• If test run is set with the outdoor unit, the test run is performed for all indoor units.

• The remote controller operation becomes unavailable once the test run is set with the outdoor unit.

SW3

1 2

A Stop B Cooling C Operation D Heating

C D

(Initial setting)

In case of the test run from outdoor unit, all indoor units operate. Therefore, you cannot detect any erroneous connection of refrigerant pipes and the connecting wires. If it aims at detection of any erroneous connection, be sure to carry out the test run from remote controller with reference to "(1) Using remote controller."

SW3-1 SW3-2 SW3-1 SW3-2

ON OFF ON ON

Cooling operation

Heating operation

Note: After performing the test run, set SW3-1 to OFF.

• A few seconds after the compressor starts, a clanging noise may be heard from the inside of the outdoor unit. The noise is coming from the service port due to the small difference in pressure in the pipes. The unit is not faulty.

• After power is supplied or after an operation stops for a while, a small clicking noise may be heard from the

inside of the branch box. The electronic expansion valve is opening and closing. The unit is not faulty.

When a test run is started by “Using SW3 in outdoor unit”, even if it carries out stop instructions by remote controller, outdoor unit does not stop. A test run is not ended. In this case, please set SW3 in outdoor unit to off.

Note: Be sure to wait at least 3 minutes after turning on the power supply before setting SW3-1 and SW3-2. If the DIP switches are set before 3 minutes has elapsed, the test run may not start.

(2) Using SW3 in outdoor unit

OCH573C

Page 57

8-2-4. 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.

1 2 3 4 5 6 7 8

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

Bit

Indication

Compressor operated

52C321S44SV15SV2*

—

Alw

ays lit

● Self-diagnosis function The indoor and outdoor units can be diagnosed automatically using the self-diagnosis switch (SW1) and LED indication (LED1, LED2) 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.

*SV2 is not equipped to MXZ-8C48/60NA.

Check

code

(2 digits)

Check

code

(4 digits)

Trouble

Detected Unit

Remarks

Indoor Outdoor

Remote

Controller

Ed 0403 Serial communication error

Outdoor unit Multi controller board–Power board communication trouble

U2 1102 Compressor temperature trouble

Check delay code 1202

UE 1302 High pressure trouble

Check delay code 1402

U7 1500 Superheat due to low discharge temperature trouble

Check delay code 1600

U2 1501

Refrigerant shortage trouble

Check delay code 1601

Closed valve in cooling mode

Check delay code 1501

EF 1508 4-way valve trouble in heating mode

Check delay code 1608

UF 4100 Compressor current interruption (locked compressor)

Check delay code 4350

UP 4210 Compressor overcurrent interruption

U9 4220

Voltage shortage/overvoltage/PAM error/L1open phase/primary current sensor error/power synchronization signal error

Check delay code 4320

U5 4230 Heat sink temperature trouble

Check delay code 4330

U6 4250 Power module trouble

Check delay code 4350

U8 4400 Fan trouble (Outdoor)

Check delay code 4500 U3 5101 Compressor temperature thermistor (TH4) open / short U4 5102 Suction pipe temperature thermistor (TH6) open / short U4 5105 Outdoor liquid pipe temperature thermistor (TH3) open/short Check delay code 1205 U4 5106 Ambient temperature thermistor (TH7) open/short

Check delay code 1221 U4 5109 HIC pipe temperature thermistor (TH2) open/short

Check delay code 1222 U4 5110 Heat sink temperature thermistor (TH8) open/short

Check delay code 1214 F5 5201 High pressure sensor (63HS) trouble

Check delay code 1402 F3 5202 Low pressure sensor (63LS) trouble

Check delay code 1400

UH 5300 Current sensor trouble/Primary current error

Check delay code 4310 A0 6600 Duplex address error

Only M-NET Remote controller is detected. A2 6602 Transmission processor hardware error

Only M-NET Remote controller is detected. A3 6603 Transmission bus BUSY error

Only M-NET Remote controller is detected. A6 6606 Signal communication error with transmission processor

Only M-NET Remote controller is detected. A7 6607 No ACK error

Only M-NET Remote controller is detected. A8 6608 No response frame error

Only M-NET Remote controller is detected.

E0/E4 6831 MA communication receive error

Only MA Remote controller is detected.

E3/E5 6832 MA communication send error

Only MA Remote controller is detected.

E3/E5 6833 MA communication send error

Only MA Remote controller is detected.

E0/E4 6834

MA communication receive error

Only MA Remote controller is detected. 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

NOTES:

1. When the outdoor unit detects No ACK error/No response error, an object indoor unit is treated as a stop, and not assumed to be abnormal.

2. The check codes displayed on the units may be different between the error source and others. In that case, please refer to the check code of error source by displayed attribute and address.

3. Refer to the service manual of indoor unit or remote controller for the detail of error detected in indoor unit or remote controller.

OCH573C

Page 58

Check code

Abnormal points and detection methods Causes and check points

Abnormal if serial communication between the outdoor controller board and outdoor power board is defective.

Wire breakage or contact failure of connector CN2 or

CN4

Malfunction of power board communication circuit on

outdoor controller board

Malfunction of communication circuit on outdoor

power board

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

0403

(Ed)

Serial communication error

Yes

Are they connected normally?

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

Connect the CN2 and CN4 properly.

Replace them in case of a breakage.

The communication circuit of either the outdoor controller board or power board is defective. If unable to identify the defective circuit;

Replace the outdoor controller board if it does not recover, Replace the outdoor power board.

8-3. SELF-DIAGNOSIS ACTION BY FLOWCHART

OCH573C

Page 59

Check code

Abnormal points and detection methods Causes and check points

(1) Abnormal if TH4 falls into following temperature conditions;

●exceeds 230°F [110

] continuously for 5 minutes

●exceeds 257°F [125 ]

(2) Abnormal if a pressure detected by the high pressure sensor and

converted to saturation temperature exceeds 104°F [40

] during

defrosting, and TH4 exceeds 230°F [110 ].

TH4: Thermistor <Compressor> LEV: Electronic expansion valve

Malfunction of stop valve

Over-heated compressor operation caused by

shortage of refrigerant

Defective thermistor

Defective outdoor controller board

LEV performance failure

Defective indoor controller board

Clogged refrigerant system caused by foreign

object

Refrigerant shortage while in heating operation

(Refrigerant liquid accumulation in compressor while indoor unit is OFF/thermo-OFF.)

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

1102

(U2)

Compressor temperature trouble

Yes

Is 5101 displayed when restarted?

Is the outdoor stop valve (liquid/

gas) fully open?

Is there a refrigerant leak?

Is there any abnormality on

connectors/wires such as a disconnection,

half-disconnection or breakage?

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

Refer to the diagnosis of check code 5101.

Open the stop valve (liquid/ gas) fully.

Repair the refrigerant leakage.

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

(5101)

(1102)

(no leak)

Continue to the next page

Chart 1 of 2

OCH573C

Page 60

Check code

1102

(U2)

Compressor temperature trouble

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

Yes

Continued from the previous page

Is the voltage normal value?

Is it free from any trace of over-

heating or burning?

Is there a resistance detected?

Check the voltage and appearance of the outdoor controller board.

Disconnect the thermistor wiring to check the resistance.

Disconnect the indoor LEV wiring and check the resistance.

Replace the outdoor controller board.

Replace the thermistor.

Replace the indoor LEV.

Replace the indoor controller board.

Chart 2 of 2

OCH573C

Page 61

Check code

1302

(UE)

High pressure trouble

Abnormal points and detection methods Causes and check points

(1) High pressure abnormality (63H operation)

Abnormal if 63H operates(*) during compressor operation. (*602 PSIG [4.15 MPaG])

(2) High pressure abnormality (63HS detected)

1. Abnormal if a pressure detected by 63HS exceeds 625 PSIG [4.31 MPaG] or more during compressor operation.

2. Abnormal if a pressure detected by 63HS exceeds 600 PSIG [4.14 MPaG] or more for 3 minutes during compressor operation.

63H : High pressure switch 63HS : High pressure sensor LEV : Electronic expansion valve SV1 : Solenoid valve TH7 : Thermistor <Ambient>

Defective 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 controller board connector

Defective outdoor controller board

Short-cycle of indoor unit

Decreased airow, clogged lter, or dirt on indoor unit.

Malfunction or locked indoor fan motor

Decreased airow caused by defective inspection

of outdoor 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 controller board

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

Chart 1 of 4

Yes

Is 5201 displayed when restarted?

Is the outdoor stop valve (liquid/ gas) fully open?

Does the outdoor fan rotate while the operation?

Is the indoor unit short-cycled?

Does the indoor fan rotate while the operation?

Refer to the diagnosis of check 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.

Solve the short-cycle.

Check the indoor fan motor. Refer to "How to check the parts" on the indoor unit service manual.

(5201)

(short-cycled)

(no short-cycle)

(1302)

Continue to the next page

OCH573C

Page 62

Check code

1302

(UE)

High pressure trouble

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

Chart 2 of 4

Yes

Is the indoor unit lter clogged? Clean the lter.

(Clogged lter)

(No clog)

Continued from the previous page

Is there dirt on the indoor heat exchanger?

Is the outdoor unit short-cycled?

Is there dirt on the outdoor heat exchanger?

Are the pipes clogged or broken?

Wash the indoor heat exchanger.

Solve the short cycle.

Wash the outdoor heat exchanger.

Defective pipes

(dirty)

(short-cycled)

(no dirt)

(no short-cycle)

Continue to the next page

Disconnect the TH7 wiring and check the resistance.

OCH573C

Page 63

Check code

1302

(UE)

High pressure trouble

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

Is the voltage normal? Is it free from any trace of overheating or burning?

Replace the indoor controller board.

Check the voltage and appearance of the indoor controller board.

Check the resistance of SV1.

Chart 3 of 4

Yes

Continued from the previous page

Is there a resistance detected?

Replace the TH7.

Replace the indoor LEV.

Disconnect the indoor LEV wiring to check the resistance.

Continue to the next page

OCH573C

Page 64

Check code

1302

(UE)

High pressure trouble

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

Chart 4 of 4

Yes

Continued from the previous page

Is there a voltage(*) detected?

Replace the SV1.

Replace the 63HS.

Replace the outdoor controller board.

Yes

Is the connector for outdoor controller board 63H disconnected or loose?

Reconnect the connector or connect it tightly.

Check the 63HS voltage.

Is there a resistance detected?

Yes

*For the voltage, refer to "8-7.HOW TO

CHECK THE COMPONENTS".

OCH573C

Page 65

Check code

1500

(U7)

Superheat due to low discharge temperature trouble

Abnormal points and detection methods Causes and check points

Abnormal if the discharge superheat is continuously detected -27°F [−15 ](*)

or less for 5 minutes even though the indoor LEV has minimum open pulse after the compressor starts operating for 10 minutes.

LEV : Electronic expansion valve TH4 : Thermistor <Compressor> 63HS : High pressure sensor

*At this temperature, conditions for the abnormality detection will not be satised if no abnormality is detected on either TH4 or 63HS.

Disconnection or loose connection of TH4

Defective holder of TH4

Disconnection of LEV coil

Disconnection of LEV connector

LEV performance failure

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

Chart 1 of 2

32-F [0 ]·······700k" 50-F [10 ]···410k" 68-F [20

] ····250k" 86-F [30 ]···160k"

104-F [40

]···104k"

Yes

Is the TH4 wiring disconnected?

Is the resistance normal?

Is there any abnormality such as a half-disconnection or breakage?

Connect the wiring properly.

Replace the

TH4.

Connect the connector properly, or replace the LEV.

Check the resistance of TH4

Check the connector contact and wiring of the indoor LEV.

Disconnect the indoor LEV wiring to check the resistance.

(disconnected)

(connected properly)

Continue to the next page

OCH573C

Page 66

Check code

1500

(U7)

Superheat due to low discharge temperature trouble

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

Chart 2 of 2

Is there a resistance detected?

Replace the indoor LEV.

Yes

Continued from the previous page

Is the voltage normal? Is it free from any trace of overheating or burning?

Is there a voltage(*) detected?

Replace the indoor controller board.

Replace the 63HS.

Replace the outdoor controller board.

Check the voltage and appearance of the indoor controller board.

Check the 63HS voltage.

*For the voltage, refer to "8-7.HOW TO

CHECK THE COMPONENTS".

OCH573C

Page 67

Check code

1501

(U2)

Refrigerant shortage trouble

Abnormal points and detection methods Causes and check points

(1) Abnormal when all of the following conditions are satised for 15 consecutive minutes:

1. The compressor is operating in HEAT mode.

2. Discharge super heat is 144°F [80 ] or more.

3. Difference between TH7 and the TH3 applies to the formula of (TH7−TH3 < 9°F [5 ]).

4.The saturation temperature converted from a high pressure sensor detects below 95°F [35 ].

(2) Abnormal when all of the following conditions are satised:

1.The compressor is in operation.

2.When cooling, discharge superheat is 144°F [80 ] or more, and the saturation temperature converted from a high pressure sensor is over

−40°F [−40 ].

3. When heating, discharge superheat is 162°F [90 ] or more.

Defective operation of stop valve (not fully open)

Defective thermistor

Defective outdoor controller board

Indoor LEV performance failure

Gas leakage or shortage

Defective 63HS

TH3 : Thermistor <Outdoor liquid pipe> TH7 : Thermistor <Ambient> LEV : Electronic expansion valve 63HS : High pressure sensor

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

Chart 1 of 2

Yes

Is the outdoor stop valve (ball valve) fully open?

Is there a refrigerant leak?

Is 5104 displayed when restarted?

Is there any abnormality on connectors such as a disconnection, half-disconnection or breakage?

Refer to the diagnosis of check code 5104.

Check relevant thermistor wirings and connector contacts of the controller boards.

Disconnect the thermistor wiring and check the resistance.

Open the stop valve (ball valve) fully.

Repair the refrigerant leak.

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

(leaking)

(5104)

(no leaking)

(1501)

Continue to the next page

OCH573C

Page 68

Check code

1501

(U2)

Refrigerant shortage trouble

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

Chart 2 of 2

*For the voltage, refer to

"8-7.HOW TO CHECK THE COMPONENTS".

Yes

Continued from the previous page

Is there a voltage(*) detected?

Is the voltage normal value?

Is it free from any trace of over-

heating or burning?

Is there a resistance detected?

Replace the outdoor controller board.

Replace the 63HS.

Replace the indoor LEV.

Replace the indoor controller board.

Check the 63HS voltage.

Check the voltage and appearance of the outdoor controller board.

Disconnect the indoor LEV wiring and check the resistance.

Is there a resistance detected? Replace the thermistor.

OCH573C

Page 69

Check code

1501

(U2)

Closed valve in cooling mode

Abnormal points and detection methods Causes and check points

Abnormal if stop valve is closed during cooling operation.

Abnormal when both of the following temperature conditions are satised for 20 minutes or more during cooling operation.

1. TH22j − TH21j ] -3.6°F [−2°C]

2. TH23j − TH21j ] -3.6°F [−2°C]

Note: For indoor unit, the abnormality is detected if an operating unit satises the condition.

Outdoor liquid/gas valve is closed.

Mulfunction of outdoor LEV (LEV-A) (blockage)

TH21:

Indoor intake temperature thermistor (RT11 or TH1)

TH22:

Indoor liquid pipe temperature thermistor (RT13 or TH2)

TH23:

Branch box gas pipe temperature thermistor (TH-A to E

)

LEV: Electronic expansion valve

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

Is the

outdoor stop valve

(liquid/gas)

fully open?

Open the

outdoor stop valve

(liquid/gas) fully

Yes

Disconnect the outdoor LEV wiring to check the resistance.

Yes

Replace the outdoor LEV.

Replace the outdoor controller board.

Is there a resistance detected?

OCH573C

Page 70

Check code

1508

(EF)

4-way valve trouble in heating mode

Abnormal points and detection methods Causes and check points

Abnormal if 4-way valve does not operate during heating operation.

Abnormal when any of the following temperature conditions is satised for 3 minutes or more during heating operation

1. TH22j − TH21j [ -18°F [−10°C]

2. TH23j − TH21j [ -18°F [−10°C]

3. TH22j [ 37.4°F [3:]

4. TH23j [ 37.4°F [3:]

Note: For indoor unit, the abnormality is detected if an operating unit satises the condition.

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

TH21:

Indoor intake temperature thermistor (RT11 or TH1)

TH22:

Indoor liquid pipe temperature thermistor (RT13 or TH2)

TH23:

Branch box gas pipe temperature thermistor (TH-A to E)

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

Is the connector for outdoor multi

controller circuit board or 4-way

valve coil disconnected or loose?

Reconnect the connector or connect it tightly.

Yes

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

Replace the 4-way valve.

Replace the outdoor multi

controller circuit board.

Is the detected voltage normal?

Is it free from any trace of over-

heating or burning?

Is there a resistance detected?

Check the voltage and appearance of the outdoor multi controller circuit board.

Replace the outdoor power circuit board.

Yes

OCH573C

Page 71

Check code

Abnormal points and detection methods Causes and check points

Abnormal if overcurrent of DC bus or compressor is detected before 30 seconds after the compressor starts operating.

Closed stop valve

Decrease of power supply voltage

Looseness, disconnection, or wrong phase of

compressor wiring connection

Model selection error on indoor controller board or

outdoor multi controller circuit board

Defective compressor

Defective outdoor power circuit board

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

4100

(UF)

Compressor current interruption (Locked compressor)

Chart 1 of 2

Yes

Is the stop valve

(liquid/gas)

fully

open?

Is the power supply voltage normal?

Are they set properly?

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 switch correctly, then restart.

Check the stop valve.

Check the power supply voltage.

Check if the model selection switch is set correctly on the indoor controller board or outdoor multi controller circuit board.

Turn the power OFF to check for looseness, disconnection, or wrong phase

of compressor wiring connection.

Continue to the next page

OCH573C

Page 72

Check code

4100

(UF)

Compressor current interruption (Locked compressor)

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

Chart 2 of 2

Yes

Are they connected properly?

Is the compressor faulty grounded?

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

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

Replace the compressor (Defective compressor).

Check whether the compressor is faulty grounded or not.

Continued from the previous page

OCH573C

Page 73

Check code

Abnormal points and detection methods Causes and check points

Abnormal if overcurrent of DC or the compressor is detected after 30 seconds since the compressor starts operating.

Closed outdoor stop valve

Decrease of power supply voltage

Looseness, disconnection or reverse phase of

compressor wiring connection

Malfunction of indoor/outdoor fan

Short-cycle of indoor/outdoor unit

Model selection error upon replacement of outdoor

multi controller circuit board

Malfunction of input circuit on outdoor multi controller

circuit board

Defective compressor

Defective outdoor power circuit board

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

4210

(UP)

Compressor overcurrent interruption

Chart 1 of 2

Yes

Is the stop valve

(liquid/gas)

fully

open?

Is the power supply voltage normal?

Are they set properly?

Open the stop valve

(liquid/gas)

fully.

Check the power supply facility (check for power supply open phase).

Set the model selection correctly.

Check the outdoor stop valve.

Check whether the power supply voltage is normal or not.

Check whether the model selection switch is set correctly on the outdoor multi controller circuit board or not.

Turn the power OFF to check for looseness, disconnection or converse phases of the compressor

wiring

Continue to the next page

OCH573C

Page 74

Check code

4210

(UP)

Compressor overcurrent interruption

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

Chart 2 of 2

Yes

Are they connected properly?

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

Continued from the previous page

Does it operate normally?

Are those units short-cycled?

Are the voltage among the phases U-V, V-W and W-U different?

Does it operate normally?

Check the DC fan motor.

Remove factor(s) causing the short-cycle.

Replace the compressor.

Replace the outdoor power board.

Complete

Check the operation of indoor/outdoor fan motors.

Check for indoor/outdoor short-cycle.

Disconnect the compressor wiring from the outdoor power 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.

Replace the outdoor controller board.

(short-cycled)

(no short-cycled)

OCH573C

Page 75

Check code

Abnormal points and detection methods Causes and check points

Abnormal if any of following symptoms are detected;

●Decrease of DC bus voltage to 200V

●Increase of DC bus voltage to 400V

●DC bus voltage stays at 310V or less for consecutive 30 seconds when the operational frequency is over 20 Hz.

●When any of following conditions is satisfied while the detections value of primary current is 0.1A or less.

1. The operational frequency is 40Hz or more.

2. The compressor current is 6A or more.

Decrease/increase of power supply voltage

Primary current sensor failure

Disconnection of compressor wiring

Malfunction of 52C

Disconnection or contact failure of CN52C

Defective outdoor power circuit board

Malfunction of 52C driving circuit on outdoor multi

controller circuit board

Disconnection of CN5

Disconnection of CN2

Malfunction of primary current detecting circuit on

outdoor power circuit board

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

vzv

4220

(U9)

Voltage shortage /Overvoltage/PAM error/L1 open phase/

Primary current sensor error/Power synchronization signal error

The black square (■) indicates a switch position.

Chart 1 of 2

Yes

7,8

Is there any abnormality on wirings?

Which sub code is displayed?

Does a DC bus voltage raise to approx. 350 V at PAM driving?

Is there any abnormality on PAM wirings?

Is there any abnormality at the PAM circuit on the outdoor power circuit board?*

Is there any abnormality at the PAM power supply circuit or 52C relay drive signal circuit on

the outdoor multi controller?*

a. Disconnection of compressor wiring b. Disconnection of CN52C c. Disconnection of CN5 d. Disconnection of CN2

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

Check the power supply facility.

Correct the wiring.

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

Replace the outdoor multi controller circiut board.Breakage of wiring for PAM controlling power supply, and such.

Replace the outdoor power circuit board

(Defective outdoor power circuit board)

OFF

1 2 3 4 5 6 7 8

SW1 Setting

Display on LED1,2

2 3 4 5 6 7 8

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

Continue to the next page

*Refer to "8-6. HOW TO CHECK THE PARTS".

OCH573C

Page 76

Check code

4220

(U9)

Voltage shortage /Overvoltage/PAM error/L1 open phase/

Primary current sensor error/Power synchronization signal error

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

The black square (■) indicates a switch position.

Chart 2 of 2

Yes

7,8 6

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

Correct the CN5 wiring.

Continued from the previous page

Is the power supply normal?

Is the bus voltage normal?

The difference of the voltage between

the one read by the LED1 and 2, and the

one at the testpoints listed above is large.

Decrease of power supply voltage. L1 open-phase.

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

Replace the outdoor power circuit board (Trouble of an input current detection circuit is suspected.).

Check the power supply facility (Check if a receiving electricity is lowered).

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

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

OFF

1 2 3 4 5 6 7 8

SW1 Setting

Display on LED1,2

Unit

0–999.9 V

OCH573C

Page 77

Check code

Abnormal points and detection methods Causes and check points

Abnormal if TH8 detects a temperature outside the specied range during compressor operation.

TH8:

Thermistor <Heat sink>

Blocked outdoor fan

Malfunction of outdoor fan motor

Blocked airow path

Rise of ambient temperature

Characteristic defect of thermistor

Malfunction of input circuit on outdoor power board

Malfunction of outdoor fan driving circuit

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

Is 5110 displayed when restart?

4230

(U5)

Heat sink temperature trouble

32-F [0 ]·······180kΩ 77-F [25 ]····50kΩ 122-F [50

]····17kΩ 158-F [70 ]····8kΩ

194-F [90

]·······4kΩ

Yes

Is 5110 displayed when restarted?

Does the fan rotate during compressor operation?

Is there any obstacle which

blocks an airow around the

heat

sink

Is there any abnormality such as a disconnection, looseness or breakage?

Is the resistance normal?

Refer to the diagnosis of check code 5110.

Refer to the diagnosis of check code 4400.

Replace the thermistor (Defective thermistor).

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

Improve the airow path.

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

Check the wiring and connector connection TH8.

Check the resistance of TH8.

(air path blocked)

(no obstacle)

TH8 temp. - resistance characteristic

OCH573C

Page 78

Check code

Abnormal points and detection methods Causes and check points

Abnormal if both of the following conditions are satised:

1. Overcurrent of DC bus or compressor is detected during compressor operation.

2. Inverter power module is determined to be defected.

Short-circuit caused by looseness or disconnection

of compressor wiring

Defective compressor

Defective outdoor power circuit board

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

4250

(U6)

Power module trouble or overcurrent trouble

Yes

Are they connected properly?

Is the check code <4250> still

displayed?

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

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

Replace the compressor (Defective compressor).

Turn the power OFF to check for looseness

or disconnection of the compressor wiring.

Disconnect the compressor wiring

(U-V-W phase).

Turn ON the SW7-1(*) on the outdoor

multi controller circuit board.

Operate the unit.

* SW7-1 ON: Ignore 5300(UH) error.

OCH573C

Page 79

Check code

Abnormal points and detection methods Causes and check points

Abnormal if no rotational frequency is detected, or detected a value outside the specied range during fan motor operation.

Malfunction of fan motor

Disconnection of CNF connector

Defective outdoor multi controller circuit board

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

4400

(U8)

Fan trouble

*For the detail, refer to "Check method of

DC fan motor (fan motor/outdoor multi controller circuit board" in chapter 8-6.

Yes

Is the fuse melting?

Is there any abnormality such as a disconnection, looseness or breakage?

Is the voltage normal?

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

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

Replace the outdoor multi controller circuit board.

Replace the fan motor.

Check the fuse on the outdoor multi controller circuit board.

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

Remove the fan motor by disconnecting the fan motor connector CNF1 and CNF2, then check the voltage of outdoor multi controller circuit board "Test points are;

VDC approx. 280 to 380 V DC (fan connector 1–4) VCC approx. 15 V DC (fan connector 5–4)"

(Melting)

(Not melting)

OCH573C

Page 80

Check code

Abnormal points and detection methods Causes and check points

Abnormal if TH4 detects 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.) Open: 37.4°F [3 ] or less Short: 422.6°F [217 ] or more TH4: Thermistor <Compressor>

Disconnection or contact failure of connectors

Characteristic defect of thermistor

Defective outdoor multi controller circuit board

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

5101

(U3)

Compressor temperature thermistor (TH4) open/short

The black square (■) indicates a switch position.

Yes

Is there any abnormality such as a disconnection, looseness or breakage?

Is the detected resistance normal?

Is the detected temperature normal?

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

Replace the thermistor.

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

No abnormality ( A connector contact failure is suspected).

Check the wiring and connector connection of TH4

Disconnect the connector to check the resistance of TH4 using a tester.

Check a temperature of TH4.

The detected temperature of TH4 can be displayed by an operation of SW1 on the outdoor controller board.

SW1 Setting

OFF

Display on LED1, 2

Unit

−99.9–999.9

°F

41 2 5 6 7 83

OCH573C

Page 81

Check code

Abnormal points and detection methods Causes and check points

Abnormal if TH6 detects to be open/short. (The open/short detection is disabled during 10 seconds to 10 minutes. after compressor starts, during defrosting operation, or for 10 minutes after returning from the defrosting operation.) Open:−40°F [−40 ] or less Short: 194°F [90 ] or more TH6: Thermistor <Suction pipe>

Disconnection or contact failure of connectors

Characteristic defect of thermistor

Defective outdoor multi controller circuit board

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

Suction pipe temperature thermistor (TH6) open/short

The black square (■) indicates a switch position.

5102

(U4)

Yes

Is there any abnormality such as a disconnection, looseness or breakage?

Is the detected resistance normal?

Is the detected temperature normal?

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

Replace the thermistor.

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

No abnormality ( A connector contact failure is suspected).

Check the wiring and connector connection of TH6.

Disconnect the connector to check the resistance of TH6 using a tester.

Check a temperature of TH6.

OFF

1 2 3 4 5 6 7 8

SW1 Setting

Display on LED1,2

Unit

−99.9–999.9

°F

The detected temperature of TH6 can be displayed by an operation of SW1 on the outdoor controller board.

OCH573C

Page 82

Check code

Abnormal points and detection methods Causes and check points

Abnormal if TH3 detects to be open/short. (The open/short detection is disabled during 10 seconds to 10 minutes. after compressor starts, during defrosting operation, or for 10 minutes after returning from the defrosting operation.) Open: −40°F [−40 ] or less Short: 194°F [90 ] or more TH3: Thermistor <Outdoor liquid pipe>

Disconnection or contact failure of connectors

Characteristic defect of thermistor

Defective outdoor multi controller circuit board

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

5105

(U4)

Outdoor liquid pipe temperature thermistor (TH3) open/short

The black square (■) indicates a switch position.

SW1 Setting

OFF

Display on LED1, 2

Unit

−99.9–999.9

41 2 5 6 7 83

°F

Yes

Is there any abnormality such as a disconnection, looseness or breakage?

Is the detected resistance normal?

Is the detected temperature normal?

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

Replace the thermistor.

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

No abnormality ( A connector contact failure is suspected).

Check the wiring and connector connection of TH3.

Disconnect the connector to check the resistance of TH3 using a tester.

Check a temperature of TH3.

The detected temperature of TH3 can be displayed by an operation of SW1 on the outdoor controller board.

OCH573C

Page 83

Check code

5106

(U4)

Ambient temperature thermistor (TH7) open/short

Abnormal points and detection methods Causes and check points

Abnormal if TH7 detects to be open/short Open: −40°F [-40 ] or less Short: 194°F [90 ] or more TH7: Thermistor <Ambient>

Disconnection or contact failure of connectors

Characteristic defect of thermistor

Defective outdoor multi controller circuit board

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

The black square (■) indicates a switch position.

SW1 Setting

OFF

Display on LED1, 2

Unit

−99.9–999.9

41 2 5 6 7 83

°F

Yes

Is there any abnormality such as a disconnection, looseness or breakage?

Is the detected resistance normal?

Is the detected temperature normal?

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

Replace the thermistor.

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

No abnormality ( A connector contact failure is suspected).

Check the wiring and connector connection of TH7.

Disconnect the connector to check the resistance of TH7 using a tester.

Check a temperature of TH7.

The detected temperature of thermistor (TH7) can be displayed by an operation of SW1 on the outdoor controller board.

The detected temperature of TH7 can be displayed by an operation of SW1 on the outdoor controller board.

OCH573C

Page 84

Check code

5109

(U4)

HIC pipe temperature thermistor (TH2) open/short

Abnormal points and detection methods Causes and check points

Abnormal if TH2 detects to be open/short. Open: –40°F [–40 ] or less Short: 194°F [90 ] or more TH2: Thermistor <

HIC pipe>

Disconnection or contact failure of connectors

Characteristic defect of thermistor

Defective outdoor multi controller circuit board

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

The black square (■) indicates a switch position.

Yes

Is there any abnormality such as a disconnection, looseness or breakage?

Is the detected resistance normal?

Is the detected temperature normal?

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

Replace the thermistor.

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

No abnormality ( A connector contact failure is suspected.)

Check the wiring and connector connection of TH2.

Disconnect the connector to check the resistance of TH2 using a tester.

Check a temperature of TH2.

OFF

1 2 3 4 5 6 7 8

SW1 Setting

Display on LED1,2

Unit

−99.9–999.9 °F

The detected temperature of TH2 can be displayed by an operation of SW1 on the outdoor controller board.

OCH573C

Page 85

Check code

5110

(U4)

Heat sink temperature thermistor (TH8) open/short

Abnormal points and detection methods Causes and check points

Abnormal if TH8 detects to be open/short. Open: −31.2°F [−35.1 ] or less

Short: 338.5°F [170.3 ] or more

TH8: Thermistor <Heat sink>

Disconnection or contact failure of connectors

Characteristic defect of thermistor

Defective outdoor multi controller circuit board

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

outdoor

The black square (■) indicates a switch position.

SW1 Setting

OFF

Display on LED1, 2

Unit

41 2 5 6 7 83

°F

−99.9–999.9

Yes

Is there any abnormality such

as a disconnection, looseness or

breakage?

Is the detected resistance normal?

Is the detected temperature normal?

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

Replace the thermistor.

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

No abnormality ( A connector contact failure is suspected.)

Check the wiring and connector connection of TH8.

Disconnect the connector to check the resistance of TH8 using a tester.

Check a temperature of TH8.

The detected temperature of thermistor (TH8) can be displayed by an operation of SW1 on the outdoor controller board.

The detected temperature of TH8 can be displayed by an operation of SW1 on the outdoor controller board.

Is it a model with internal

thermistor?

OCH573C

Page 86

Check code

5201

(F5)

High pressure sensor (63HS) trouble

Abnormal points and detection methods Causes and check points

When the detected pressure in the high pressure sensor is 14.2 PSIG

[1 kgf/F] or less during operation, the compressor stops operation and enters into an anti-restart mode for 3 minutes.

When the detected pressure is 14.2 PSIG [1 kgf/F] or less immediately

before restarting, the compressor falls into an abnormal stop with a check code <5201>.

For 3 minutes after compressor restarting, during defrosting operation,

and for 3 minutes after returning from defrosting operation, above mentioned symptoms are not determined as abnormal.

Defective high pressure sensor

Decrease of internal pressure caused by gas

leakage

Disconnection or contact failure of connector

Malfunction of input circuit on outdoor multi controller

circuit board

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

The black square (■) indicates a switch position.

63HS: High pressure sensor

SW1 Setting

OFF

Display on LED1, 2

Unit

−99.9–999.9

PSIG [kgf/F]

41 2 5 6 7 83

Yes

Is there any abnormality such as a disconnection, looseness or breakage?

Is the detected internal pressure normal?

Is the detected pressure normal?

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

Check the refrigerant circuit, and rell refrigerant after repairing the leakage.

Replace the 63HS.

Replace the outdoor multi

controller circuit board.

Check the wiring and connector connection.

Check an internal pressure of the refrigerant circuit.

Check the detected pressure in 63HS, then compare it with the internal pressure.

The detected pressure in 63HS can be displayed by an operation of SW1 on the outdoor controller board.

OCH573C

Page 87

Check code

5202

(F3)

Low pressure sensor (63LS) trouble

Abnormal points and detection methods Causes and check points

When the detected pressure in the low pressure sensor is −32.7

PSIG [−2.3kgf/F] or less, or 328.6 PSIG [23.1kgf/F] or more during operation, the compressor stops operation with a check code <5202>.

For 3 minutes after compressor restarting, during defrosting operation,

and for 3 minutes after returning from defrosting operation, above mentioned symptoms are not determined as abnormal.

Defective low pressure sensor

Decrease of internal pressure caused by gas

leakage

Disconnection or contact failure of connector

Malfunction of input circuit on outdoor multi controller

circuit board

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

The black square (■) indicates a switch position.

63LS: Low pressure sensor

Yes

Is there any abnormality such as a disconnection, looseness or breakage?

Is the detected internal pressure normal?

Is the detected pressure normal?

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

Check the refrigerant circuit, and rell refrigerant after repairing the leakage.

Replace the 63LS.

Replace the outdoor multi

controller circuit board.

Check the wiring and connector connection.

Check an internal pressure of the refrigerant circuit.

Check the detected pressure in 63LS, then compare it with the internal pressure.

OFF

1 2 3 4 5 6 7 8

SW1 Setting

Display on LED1,2

Unit

−99.9–999.9

[kgf/cm²]

PSIG

The detected pressure in 63LS can be displayed by an operation of SW1 on the outdoor controller board.

OCH573C

Page 88

Check code

5300

(UH)

Current sensor trouble/Primary current error

Abnormal points and detection methods Causes and check points

Abnormal if any of the following conditions is detected:

Primary current sensor detects any of the following conditions (single

phase unit only):

Secondary current sensor detects 25 A or more.

Secondary current sensor detects 1.0 A or less.

Decrease/trouble of power supply voltage

Disconnection of compressor wiring

Current sensor trouble on outdoor power circuit

board

Wiring through current sensor (penetration type) is

not done.

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

The black square (■) indicates a switch position.

Ambient

temperature

10 consecutive-

second detection

One-time detection

TH7 > 3: 37 A 40 A TH7 [ 3: 40 A 43A

Yes

Is the power supply single phase?

Is there any abnormality

such as a disconnection,

looseness, or breakage?

The power supply voltage might be decreased or abnormal. Check the power supply facility.

Connect the compressor wiring properly.

Replace the outdoor power circuit board (Malfunction of current sensor circuit).

Check the power specication of the outdoor unit.

Check the value on the secondary current sensor during the error.

(Single-phase)

Does it satisfy the condition 1?

Does it satisfy the condition 2 or 3?

Check the compressor wiring.

(Three-phase)

SW1 Setting

OFF

Display on LED1, 2

Unit

0–999.9

Arms

41 2 5 6 7 83

The secondary current sensor value during the error can be displayed by an operation of SW1 on the outdoor multi controller circuit board.

OCH573C

Page 89

Check code

Abnormal points and detection methods Causes and check points

Abnormal if 2 or more units with the same address are existing. There are 2 units or more with the same address

in their controller among outdoor unit, indoor unit, Fresh Master, Lossnay or remote controller

Noise interference on indoor/outdoor connectors

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

6600

(A0)

Duplex address error

Yes

Is there any unit with the same address?

Does it operate normally?

Correct the address, and turn the power OFF of indoor/outdoor unit, Fresh Master or Lossnay simultaneously for 2 minutes or more, then turn the power back ON.

Malfunction of sending/receiving circuit on indoor/outdoor unit is suspected.

There is no abnormality on the AC unit It might be caused by an external noise, so check the transmission line to remove the factor(s).

Search for a unit with the same address as the source of abnormality.

Turn the power back ON.

OCH573C

Page 90

Check code

Abnormal points and detection methods Causes and check points

Abnormal if the transmission line shows "1" although the transmission processor transmitted "0".

A transmitting data collision occurred because of a

wiring work or polarity change has performed while the power is ON on either of the indoor/outdoor unit, Fresh Master or Lossnay

Malfunction of transmitting circuit on transmission

processor

Noise interference on indoor/outdoor connectors

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

6602

(A2)

Transmission processor hardware error

Yes

A wiring work was performed while the power OFF.

Does it operate normally?

If the wiring work was performed while the power ON, turn the power OFF of indoor/ outdoor unit, Fresh Master or Lossnay simultaneously for 2 minutes or more, then turn the power back ON.

Replace the indoor/outdoor controller board.

There is no abnormality on the AC unit. It might be caused by an external noise, so check the transmission line to remove the factor(s).

Turn the power back ON.

OCH573C

Page 91

Check code

Abnormal points and detection methods Causes and check points

Over error by collision

Abnormal if no-transmission status caused by a transmitting data collision is consecutive for 8 to 10minutes.

Abnormal if a status, that data is not allowed on the transmission line

because of noise and such, is consecutive for 8 to 10 minutes

The transmission processor is unable to transmit due

to a short-cycle voltage such as noise is mixed on the transmission line

The transmission processor is unable to transmit due

to an increase of transmission data amount caused by a miswiring of the terminal block (transmission line) (TB3) and the terminal block (centralized control line) (TB7) on the outdoor unit.

The share on transmission line becomes high due

to a mixed transmission caused by a malfunction of repeater on the outdoor unit, which is a function to connect/disconnect transmission from/to control system and centralized control system.

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

6603

(A3)

Transmission bus BUSY error

Yes

Is the transmission line miswired?

Does it operate normally?

Correct the wiring, then turn the power back ON.

Replace the indoor/outdoor controller board.

There is no abnormality on the AC unit. It might be caused by an external noise, so check the transmission line to remove the factor(s).

Check whether the transmission line to the indoor unit, Fresh Master, Lossnay or remote controller is miswired to the terminal block (TB7) on outdoor unit or not.

Check whether the transmission line with the other refrigerant system of the indoor unit, Fresh Master or Lossnay is miswired to the terminal block (TB3) on outdoor unit or not.

Turn the power back ON.

(miswired)

(wired correctly)

OCH573C

Page 92

Check code

Abnormal points and detection methods Causes and check points

Abnormal if the data of unit/transmission processor were not normally

transmitted.

Abnormal if the address transmission from the unit processor was not

normally transmitted.

Accidental disturbance such as noise or lightning

surge

Hardware malfunction of transmission processor

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

6606

(A6)

Signal communication error with transmission processor

Yes

Does it operate normally?

Replace the controller (Defect of error source controller).

There is no abnormality on the AC unit. It might be caused by an external noise, so check the transmission line to remove the factor(s).

Turn the power OFF of indoor/outdoor unit, Fresh Master, Lossnay and remote controller simultaneously for 2 minutes or more, then turn the power back ON.

OCH573C

Page 93

Check code

Abnormal points and detection methods Causes and check points

Represents a common error detection

An abnormality detected by the sending side controller when receiving no ACK from the receiving side, though signal was once sent. The sending side searches the error in 30 seconds interval for 6 times continuously.

The previous address unit does not exist since

the address switch was changed while in electric continuity status.

Decline of transmission voltage/signal caused by

tolerance over on transmission line

·At the furthest end: 656 ft [200 m]

·On remote controller line: 39 ft [12 m]

Decline of transmission voltage/ signal due to

unmatched transmission line types

·Types for shield line: CVVS, CPEVS

·Line diameter: AWG16 [1.25 E] or more

Decline of transmission voltage/ signal due to

excessive number of connected units

Malfunction due to accidental disturbance such as

noise or lightning surge

Defect of error source controller

The cause of displayed address and attribute is on the outdoor unit side

An abnormality detected by the indoor unit if receiving no ACK when transmitting signal from the indoor unit to the outdoor unit.

Contact failure of indoor/outdoor unit transmission

line

Disconnection of transmission connector (CN2M) on

indoor unit

Malfunction of sending/receiving circuit on indoor/

outdoor unit

The cause of displayed address and attribute is on the indoor unit side

An abnormality detected by the remote controller if receiving no ACK when sending data from the remote controller to the indoor unit.

While operating with multi refrigerant system indoor

units, an abnormality is detected when the indoor unit transmit signal to the remote controller during the other refrigerant-system outdoor unit is turned OFF, or within 2 minutes after it turned back ON.

Contact failure of indoor unit or remote controller

transmission line

Disconnection of transmission connector (CN2M) on

indoor unit

Malfunction of sending/receiving circuit on indoor

unit or remote controller

The cause of the displayed address and attribute is on the remote

controller side An abnormality detected by the indoor unit if receiving no ACK when transmitting signal from the indoor unit to the remote controller.

While operating with multi refrigerant system indoor

Contact failure of indoor unit or remote controller

transmission line

Disconnection of transmission connector (CN2M) on

indoor unit

Malfunction of sending/receiving circuit on indoor

unit or remote controller

6607

(A7)

No ACK error

Chart 1 of 4

OCH573C

Page 94

Check code

6607

(A7)

No ACK error

Abnormal points and detection methods Causes and check points

The cause of displayed address and attribute is on the Fresh Master

side An abnormality detected by the indoor unit if receiving no ACK when transmitting signal from the indoor unit to the Fresh Master.

While the indoor unit is operating with multi

refrigerant system Fresh Master, an abnormality is detected when the indoor unit transmits signal to the remote controller while the outdoor unit with the same refrigerant system as the Fresh Master is turned OFF, or within 2 minutes after it turned back ON.

Contact failure of indoor unit or Fresh Master

transmission line

Disconnection of transmission connector (CN2M) on

indoor unit or Fresh Master

Malfunction of sending/receiving circuit on indoor

unit or Fresh Master

The cause of displayed address and attribute is on Lossnay side

An abnormality detected by the indoor unit if receiving no ACK when the indoor unit transmit signal to the Lossnay.

An abnormality is detected when the indoor unit

transmits signal to Lossnay while the Lossnay is turned OFF.

While the indoor unit is operating with the other

refrigerant Lossnay, an abnormality is detected when the indoor unit transmits signal to the Lossnay while the outdoor unit with the same refrigerant system as the Lossnay is turned OFF, or within 2 minutes after it turned back ON.

Contact failure of indoor unit or Lossnay transmission

line

Disconnection of transmission connector (CN2M) on

indoor unit

Malfunction of sending/receiving circuit on indoor

unit or Lossnay

The controller of displayed address and attribute is not recognized. The previous address unit does not exist since

the address switch was changed while in electric continuity status.

An abnormality detected at transmitting from the

indoor unit since the Fresh Master/Lossnay address are changed after synchronized setting of Fresh Master/Lossnay by the remote controller.

Chart 2 of 4

OCH573C

Page 95

Check code

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

6607

(A7)

No ACK error

Chart 3 of 4

Yes

The transmission line is connected properly.

It is not exceeding the tolerance.

Check the transmission line whether it exceeds the tolerance or not.

Check whether the correct kind of transmission line is used or not.

Correct it within the tolerance, then perform the procedure 1.

Connect the transmission line properly, then perform the procedure 1.

Is the abnormality reproduced?

Is it set properly?

There is no abnormality on the AC unit. It might be caused by an external noise, so check the transmission line to remove the factor(s).

Set the address properly, then perform the procedure 1.

Check the address switch on the source of abnormality.

Check the transmission line for a disconnection and looseness (on the terminal board and connector).

Turn the power OFF of indoor/outdoor unit, Fresh Master, Lossnay and remote controller simultaneously for 2 minutes or more, then turn the power back ON.

Procedure 1:

Continue to the next page

OCH573C

Page 96

Check code

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

6607

(A7)

No ACK error

Diagnosis Remedy

Chart 4 of 4

Yes

Is the correct kind of transmission line used?

Is it operating in multi refrigerant system?

Is the address information correct?

Does it operate normally?

When operating in a multi refrigerant system (2 or more outdoor units), check if any of the indoor unit stores non-existing address information.

Replace the controller board which the displayed address/attribute belongs to.

Continued from the previous page

Defective outdoor controller board (repeater circuit) on the outdoor unit is suspected. Replace the outdoor controller board one by one, then check for normal operation.

Delete the unnecessary address using a manual setting function on the remote controller (Only for operating in a system with the Fresh Master/Lossnay is connected, or in a multi refrigerant system with group setting is set).

When operating in a single refrigerant system (single indoor unit), the controller of the displayed address/attribute is defective.

Apply the correct kind of transmission line, then perform the procedure 1.

Complete

OCH573C

Page 97

Check code

6608

(A8)

Abnormal points and detection methods Causes and check points

Abnormal if receiving no response command while already received ACK. The sending side searches the error in 30 seconds interval for 6 times continuously.

Continuous failure of transmission due to noise etc

Decline of transmission voltage/signal caused by

tolerance over on transmission line

·At the furthest end: 656 ft [200 m]

·On remote controller line: 39 ft [12 m]

Decline of transmission voltage/ signal due to

unmatched transmission line types

·Types for shield line: CVVS, CPEVS

·Line diameter: AWG16 [1.25 E] or more

Accidental malfunction of error source controller

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.

Diagnosis Remedy

No response frame error

Yes

Does it operate normally?

The transmission line is connected properly.

It is not exceeding the tolerance.

Is correct kind of transmission line used?

Replace the controller board (Defect of the controller which the displayed address/attribute belong to).

Connect the transmission line properly.

Correct it within the tolerance.

Replace it with the correct kind of transmission line.

There is no abnormality on the AC unit. Check the transmission line for transmission wave and noise.

Turn the power OFF of indoor/outdoor unit, Fresh Master, Lossnay and remote controller simultaneously for 2 minutes or more, then turn the power back ON.

Check the transmission line for a disconnection and looseness (on the terminal board and connector).

Check the transmission line whether it exceeds the tolerance or not.

Check whether the correct kind of transmission line is used or not.

OCH573C

Page 98

Check code

6831(E0/E4) 6834(E0/E4)

MA communication receive error

Abnormal points and detection methods Causes and check points

Detected in remote controller or indoor unit:

When the main or sub remote controller cannot receive signal from

indoor unit which has the "0" address.

When the sub remote controller cannot receive signal. When the indoor controller board cannot receive signal from remote

controller or another indoor unit.

When the indoor controller board cannot receive signal.

Contact failure of remote controller wirings Irregular Wiring

(A wiring length, number of connecting remote controllers or indoor units, or a wiring thickness does not meet the conditions specied in the chapter "Electrical Work" in the indoor unit Installation Manual.)

Malfunction of the remote controller sending/

receiving circuit on indoor unit with the LED2 is blinking.

Malfunction of the remote controller sending/

receiving circuit

Remote controller transmitting error caused by noise

interference

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards

Diagnosis Remedy

Check the remote controller for

main-sub setting.

Conduct the Remote Controller

Diagnosis 2 or more times.

Is "RC NG"

displayed?

Turn the power back ON.

Is "RC 6832" or

"ERC01"–"ERC66"

displayed?

No abnormality It might be caused by an external noise, so check the transmission line.

Yes

Chart 1 of 2

Yes

Is the check code

<6831> or <6834>still

displayed?

Is there only 1 remote controller

set as the main controller?

Does "HO"or "Please

wait" disappear within

6 minutes?

Is "RC OK" displayed on all remote controllers?

Set one remote controller to main remote controller, and the other to sub.

Disconnect and reconnect the

connector CN3A, then turn the

power back ON.

Note:

It takes 6 seconds at maximum until the result is displayed.

Continue to the next page

No abnormality A connector or wiring contact failure is suspected.

Replace the remote controller.

Replace the indoor controller board with the LED2 is blinking.

OCH573C

Page 99

Check code

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards

Diagnosis Remedy

6831(E0/E4) 6834(E0/E4)

MA communication receive error

Chart 2 of 2

No abnormality It might be caused by an external noise, so check the transmission line to remove the factor(s).

Yes

Is the wiring connected

properly, meeting the condition?

Connect the wiring properly as specied in the chapter "Electrical Work" in the indoor unit Installation Manual.

Refer to the chapter "Electrical Work".

Continued from the previous page

OCH573C

Page 100

Check code

Chart 1 of 2

6832(E3/E5) 6833(E3/E5)

MA communication send error

Abnormal points and detection methods Causes and check points

Detected in remote controller or indoor unit. There are 2 remote controllers set as main.

Malfunction of remote controller sending/receiving

circuit

Malfunction of sending/receiving circuit on indoor

controller board

Remote controller transmitting error caused by noise

interference

●Diagnosis of defectives

Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards

Diagnosis Remedy

Check the remote controller for main-sub setting.

Conduct the Remote Controller Diagnosis more than 2 times.

Is the check code

<6832> or <6833> still

displayed?

Is there only 1 remote controller

set as the main controller?

Set one remote controller to main remote controller, and the other to sub.

Disconnect and reconnect the connector CN3A, then turn the power back ON.

Note:

It takes 6 seconds at maximum until the result is displayed.

No abnormality A connector or wiring contact failure is suspected.

Yes

Continue to the next page

Is "RC NG"

displayed?

Turn the power back ON

Is "RC 6832" or

"ERC01"–"ERC66"

displayed?

No abnormality It might be caused by an external noise, so check the transmission line.

Yes

Does "HO"or "Please

wait" disappear within

6 minutes?

Is "RC OK" displayed on all remote controllers?

Replace the remote controller.

Replace the indoor controller board with the LED2 is blinking.

Yes

100

OCH573C

Mitsubishi MXZ-4C36NAHZ-U1, MXZ-8C48NAHZ-U1, MXZ-5C42NAHZ-U1, MXZ-8C48NAHZ, MXZ-8C48NA Technical & Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual