Mitsubishi Electric MUFZ-KJ09NAHZ Owner's manual

Indoor unit service manual

MFZ-KJ•NA Series (OBH752)

NOTE:

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

PARTS CATALOG (OBB753)

MUFZ-KJ09NAHZ

MUFZ-KJ12NAHZ

CONTENTS

1. TECHNICAL CHANGES ······························2

2. PART NAMES AND FUNCTIONS ··················3

3. SPECIFICATION ········································4

4. OUTLINES AND DIMENSIONS ·····················6

5. WIRING DIAGRAM ·····································8

6. REFRIGERANT SYSTEM DIAGRAM ···········10

7. DATA······················································12

8. ACTUATOR CONTROL ·····························20

9. SERVICE FUNCTIONS ······························21

10. TROUBLESHOOTING ·······························22

11. DISASSEMBLY INSTRUCTIONS ·················43

SERVICE MANUAL

No. OBH753

REVISED EDITION-B

Models

MUFZ-KJ09NAHZ

-

U1

MUFZ-KJ12NAHZ

-

U1

MUFZ-KJ15NAHZ

-

U1

MUFZ-KJ18NAHZ

-

U1

OBH753 REVISED EDITION-A is void.

Revision B:

• Capacity corrections have been corrected [7-1. 2), 3)].

OUTDOOR UNIT

2

1

TECHNICAL CHANGES

Use the speciﬁ ed refrigerant only

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.

MUFZ-KJ09NAHZ

MUFZ-KJ12NAHZ

MUFZ-KJ15NAHZ

MUFZ-KJ18NAHZ

1. New model

Revision A:

• 3. SPECIFICATION and 7-2. PERFORMANCE CURVE has been modified.

Revision B:

• Capacity corrections have been corrected [7-1. 2), 3)].

OBH753B

3

MUFZ-KJ09NAHZ

MUFZ-KJ12NAHZ

MUFZ-KJ15NAHZ

MUFZ-KJ18NAHZ

Piping

Air outlet

Drain outlet

Air inlet

(back and side)

Drain hose

PART NAMES AND FUNCTIONS

2

Air outlet

Drain outlet

Piping

Drain hose

Air inlet

(back and side)

OBH753B

4

3

SPECIFICATION

Outdoor unit model

MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ

Capacity

Rated (Minimum~Maximum)

Cooling 1

Btu/h

9,000

(2,300 - 14,000)

12,000

(2,300 - 15,000)

15,000

(5,300 - 19,000)

17,000

(5,300 - 22,500)

Heating 47 1

Btu/h

11,000

(2,900 - 19,000)

13,000

(2,900 - 22,800)

18,000

(5,700 - 25,000)

21,000

(5,700 - 29,000)

Capacity

Rated (Maximum)

Heating 17 2

Btu/h 7,500 (13,400) 8,800(14,800) 12,000 (20,500) 12,800 (23,000)

Power consumption

Rated (Minimum~Maximum)

Cooling 1

W

570

(180 - 1,250)

890

(180 - 1,380)

1,120

(420 - 1,850)

1,350

(420 - 2,320)

Heating 47 1

W

750

(270 - 2,370)

900

(270 - 2,390)

1,410

(480 - 3,410)

1,730

(480 - 3,430)

Power consumption

Rated (Maximum)

Heating 17 2

W 810 (1,860) 930 (1,890) 1,300 (3,190) 1,430 (3,210)

EER

1

[SEER]

3

Cooling 15.8 [28.2] 13.6 [25.5] 13.5 [21.8] 12.6 [21.0]

HSPF IV

4

Heating 13.0 12.0 11.6 11.3

COP Heating

1 4.3 4.2 3.7 3.5

Power supply V , phase , Hz 208/230, 1 , 60

Max. fuse size (time delay) A 15 20

Min. circuit ampacity A 11 16

Fan motor F.L.A 0.50 0.93

Compressor

Model SNB140FQUMT SNB172FQKMT

R.L.A 8.2 12.0

L.R.A 10.3 15.0

Refrigeration oil

ﬂ oz. (L) (Model)

11.8 (0.35)/(FV50S) 13.5 (0.40)/(FV50S)

Refrigerant control Linear expansion valve

Sound level

1

Cooling dB(A) 48 48 51 51

Heating dB(A) 50 50 55 55

Defrost method Reverse cycle

Dimensions

W in. 31-1/2 33-1/16

D in. 11-1/4 13

H in. 21-5/8 34-5/8

Weight Ib. 83 124

External ﬁ nish Munsell 3Y 7.8/1.1

Remote controller Wireless type

Control voltage (by built-in transformer)

VDC 12 - 24

Refrigerant piping Not supplied

Refrigerant pipe size

(Min. wall thickness)

Liquid in. 1/4 (0.0315)

Gas in. 3/8 (0.0315) 1/2 (0.0315)

Connection meth-

od

Indoor Flared

Outdoor Flared

Between the indoor

& outdoor units

Height difference

ft. 40 50

Piping length ft. 65 100

Refrigerant charge (R410A) 2 lb. 10 oz. 3 lb. 5 oz.

NOTE: Test conditions are based on AHRI 210/240.

1: Rating conditions (Cooling) — Indoor: 80˚FDB, 67˚FWB, Outdoor: 95˚FDB, (75˚FWB)

(Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 47˚FDB, 43˚FWB

2: (Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 17˚FDB, 15˚FWB

OBH753B

5

Test condition

ARI

Mode Test

Indoor air condition (°F) Outdoor air condition (°F)

Dry bulb Wet bulb Dry bulb Wet bulb

SEER

(Cooling)

"A-2" Cooling Steady State

at rated compressor Speed

80 67 95 (75)

"B-2" Cooling Steady State

at rated compressor Speed

80 67 82 (65)

"B-1" Cooling Steady State

at minimum compressor Speed

80 67 82 (65)

"F-1" Cooling Steady State

at minimum compressor Speed

80 67 67 (53.5)

"E-V" Cooling Steady State

at Intermediate compressor Speed

5

80 67 87 (69)

HSPF

(Heating)

"H1-2" Heating Steady State

at rated compressor Speed

70 60 47 43

"H3-2" Heating

at rated compressor Speed

70 60 17 15

"H0-1" Heating Steady State

at minimum compressor Speed

70 60 62 56.5

"H1-1" Heating Steady State

at minimum compressor Speed

70 60 47 43

"H2-V" Heating

at Intermediate compressor Speed

5

70 60 35 33

5

: At Intermediate compressor Speed

= ("Rated compressor speed" - "minimum compressor speed") / 3 + "minimum compressor speed".

3, 4

(2) OPERATION

Mode Condition

Intake air temperature (°F)

Indoor Outdoor

DB WB DB WB

Cooling

Standard temperature 80 67 95 —

Maximum temperature 90 73 115 —

Minimum temperature 67 57 14 —

Maximum humidity 78 % —

Heating

Standard temperature 70 60 47 43

Maximum temperature 80 67 75 65

Minimum temperature 70 60 -13 -14

OPERATING RANGE

(1) POWER SUPPLY

Rated voltage Guaranteed voltage (V)

Outdoor unit

208/230 V

1 phase

60 Hz

Min. 187

208 230 Max. 253

OBH753B

6

clear *1

*1

4 in. (100 mm) or more when

front and sides of the unit are clear

*2

When any 2 sides of left, right

and rear of the unit are clear

2 x hole 3/8 x 13/16

REQUIRED SPACE

Liquid refrigerant pipe joint

Refrigerant pipe (flared) Ø 1/4

Gas refrigerant pipe joint

Refrigerant pipe (flared)

Ø 3/8

4 in. (100 mm)

or more

14 in. (350 mm)

or more

8 in. (200 mm)

or more *2

4 in. (100 mm)

or more

OUTLINES AND DIMENSIONS

4

Unit: inch

MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ

OBH753B

7

MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ

Unit: inch

16-7/16

1-9/16

1-5/8

Drain hole

6-7/8

19-11/16

13

2

Air in

Air out

2 x hole 13/32 x 13/16

14-3/16

33-1/16

4-5/16

3-3/16

34-5/8

17-25/32

Service panel

3-29/32

6-1/2

7-11/16

35

44

Liquid refrigerant pipe joint

Refrigerant pipe (flared)

Ø 1/4

Gas refrigerant pipe joint

Refrigerant pipe (flared)

Ø 1/2

*1 20 in. (500 mm) or more when front

and sides of the unit are clear

14in. (350 mm)

or more

4 in. (100 mm)

or more

REQUIRED SPACE

Clear *1

4 in. (100 mm)

or more

20 in. (500 mm)

or more *2

*2 When any 2 sides of left, right

and rear of the unit are clear

OBH753B

8

5

WIRING DIAGRAM

MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ

OBH753B

9

MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ

OBH753B

10

6

REFRIGERANT SYSTEM DIAGRAM

Unit: inch (mm)

Outdoor

heat

exchanger

Flared connection

Defrost

thermistor

RT61

Discharge

temperature

thermistor

RT62

Flared connection

Stop valve

(with #100 mesh strainar)

Refrigerant flow in cooling

Compressor

4-way valve

Refrigerant flow in heating

Refrigerant pipe ø3/8 (ø9.52)

(with heat insulator)

Refrigerant pipe ø1/4 (ø6.35)

(with heat insulator)

R.V. coil

heating ON

cooling OFF

Strainer

#100

LEV

Ambient

temperature

thermistor

RT65

Muffler

Capillary tube

O.D. 0.157 ×

I.D. 0.094 × 9-7/16

(ø4.0 × ø2.4 × 240)

Outdoor heat

exchanger

temperature

thermistor

RT68

Capillary tube

O.D. 0.118 ×

I.D. 0.079 × 8-9/32

(ø3.0 × ø2.0 × 210)

Service

port

Service

port

Stop valve

(with service port)

Muffler

Outdoor

heat

exchanger

Flared connection

Defrost

thermistor

RT61

Discharge

temperature

thermistor

RT62

Flared connection

Stop valve

Capillary tube

O.D. 0.157 ×

I.D. 0.094× 3-15/16

(ø4.0×ø2.4×100)

Refrigerant flow in cooling

Compressor

Service port

4-way valve

Refrigerant flow in heating

Refrigerant pipe

ø

1/2 (ø12.7)

(with heat insulator)

Refrigerant pipe

ø

1/4 (

ø6.35)

(with heat insulator)

LEV

Muffler

R.V. coil

heating ON

cooling OFF

Muffler

with #100 mesh strainer

Strainer

#100

Ambient

temperature

thermistor

RT65

Strainer

#100

Service

port

Outdoor heat

exchanger

temperature

thermistor

RT68

Stop valve

(with service port)

MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ

MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ

OBH753B

11

Max. Length

A

Max. Height

difference

B

Indoor

unit

Outdoor unit

MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE

Model

Refrigerant piping: ft. Piping size O.D: in.

Max. Length

A

Max. Height difference

B

Gas Liquid

MUFZ-KJ09NAHZ

MUFZ-KJ12NAHZ

65 40 3/8 1/4

MUFZ-KJ15NAHZ

MUFZ-KJ18NAHZ

100 50 1/2 1/4

ADDITIONAL REFRIGERANT CHARGE (R410A: oz.)

NOTE: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation.

Model

Outdoor unit

precharged

Refrigerant piping length (one way): ft.

25 30 40 50 60 65

MUFZ-KJ09NAHZ

MUFZ-KJ12NAHZ

2 lb. 10 oz. 0 1.08 3.24 5.40 7.56 8.64

Calculation: X oz. = 1.08/5 oz./ft. × (Refrigerant piping length (ft.) - 25)

NOTE: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation.

Model

Outdoor unit

precharged

Refrigerant piping length (one way): ft.

25 30 40 50 60 70 80 90 100

MUFZ-KJ15NAHZ

MUFZ-KJ18NAHZ

3 lb. 5 oz. 0 1.62 4.86 8.10 11.34 14.58 17.82 21.06 24.30

Calculation: X oz. = 1.62/5 oz./ft. × (Refrigerant piping length (ft.) - 25)

OBH753B

12

DATA7

MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ

7-1. PERFORMANCE DATA

1) COOLING CAPACITY

Model

Indoor air Outdoor intake air DB temperature (˚F)

IWB (˚F)

75 85 95 105 115

TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC

MUFZ-KJ09NAHZ

71 11.0 7.2 0.51 10.3 6.8 0.56 9.7 6.4 0.60 9.0 5.9 0.63 8.3 5.4 0.66

67 10.4 8.2 0.48 9.7 7.7 0.53 9.0 7.1 0.57 8.4 6.6 0.60 7.7 6.1 0.63

63 9.8 9.1 0.46 9.1 8.4 0.50 8.5 7.8 0.54 7.7 7.1 0.58 7.0 6.5 0.60

MUFZ-KJ12NAHZ

71 14.7 8.3 0.79 13.7 7.8 0.87 12.9 7.3 0.93 12.0 6.8 0.98 11.0 6.3 1.02

67 13.9 9.7 0.75 13.0 9.1 0.82 12.0 8.4 0.89 11.2 7.8 0.94 10.3 7.2 0.99

63 13.1 10.9 0.71 12.1 10.1 0.79 11.3 9.4 0.85 10.3 8.6 0.91 9.4 7.8 0.94

MUFZ-KJ15NAHZ

71 18.4 9.7 1.00 17.2 9.0 1.09 16.1 8.5 1.18 15.0 7.9 1.24 13.8 7.3 1.29

67 17.4 11.5 0.94 16.2 10.7 1.04 15.0 9.9 1.12 14.0 9.2 1.19 12.8 8.5 1.24

63 16.4 13.0 0.90 15.2 12.0 0.99 14.1 11.2 1.07 12.8 10.2 1.14 11.7 9.3 1.19

MUFZ-KJ18NAHZ

71 20.8 10.8 1.20 19.5 10.1 1.32 18.3 9.4 1.42 17.0 8.8 1.49 15.6 8.1 1.55

67 19.7 12.8 1.13 18.4 11.9 1.25 17.0 11.1 1.35 15.8 10.3 1.43 14.5 9.4 1.50

63

18.5 14.5 1.08 17.2 13.4 1.19 16.0 12.5 1.29 14.5 11.4 1.38 13.3 10.4 1.43

NOTE: 1. IWB : Intake air wet-bulb temperature TC : Total Capacity (x10

3

Btu/h)

SHC : Sensible Heat Capacity (x10

3

Btu/h) TPC : Total Power Consumption (kW)

2. SHC is based on 80˚F of indoor Intake air DB temperature.

2) COOLING CAPACITY CORRECTIONS

Refrigerant piping length (one way: ft.)

25 (std.) 40 65 100

MUFZ-KJ09NAHZ

MUFZ-KJ12NAHZ

1.0 0.988 0.967 -

MUFZ-KJ15NAHZ

MUFZ-KJ18NAHZ

1.0 0.985 0.963 0.933

3) HEATING CAPACITY CORRECTIONS

Refrigerant piping length (one way: ft.)

25 (std.) 40 65 100

MUFZ-KJ09NAHZ

MUFZ-KJ12NAHZ

1.0 0.977 0.993 -

MUFZ-KJ15NAHZ

MUFZ-KJ18NAHZ

1.0 0.977 0.993 0.987

OBH753B

13

4) HEATING CAPACITY

Model

Indoor air Outdoor intake air WB temperature (˚F)

IDB (˚F)

5 152535434555

TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC

MUFZ-KJ09NAHZ

75 4.8 0.57 6.4 0.69 8.0 0.79 9.5 0.73 10.7 0.77 11.1 0.78 12.5 0.81

70 5.2 0.55 6.8 0.67 8.3 0.77 9.7 0.71 11.0 0.75 11.3 0.77 12.8 0.80

65 5.5 0.54 6.9 0.65 8.6 0.75 10.1 0.69 11.3 0.73 11.7 0.74 13.1 0.78

MUFZ-KJ12NAHZ

75 5.7 0.66 7.5 0.80 9.4 0.92 11.2 0.88 12.7 0.92 13.1 0.94 14.8 0.97

70 6.2 0.64 8.0 0.78 9.8 0.90 11.5 0.86 13.0 0.90 13.4 0.92 15.1 0.95

65 6.5 0.62 8.2 0.75 10.2 0.87 11.9 0.83 13.4 0.88 13.8 0.89 15.5 0.94

MUFZ-KJ15NAHZ

75 7.9 0.95 10.4 1.17 13.1 1.35 15.6 1.37 17.6 1.45 18.1 1.47 20.5 1.52

70 8.6 0.92 11.1 1.14 13.5 1.33 15.9 1.34 18.0 1.41 18.5 1.44 21.0 1.49

65 9.0 0.88 11.3 1.09 14.1 1.28 16.5 1.30 18.5 1.37 19.1 1.40 21.4 1.47

MUFZ-KJ18NAHZ

75 9.2 1.14 12.2 1.41 15.2 1.63 18.2 1.69 20.5 1.77 21.1 1.80 23.9 1.87

70 10.0 1.10 12.9 1.37 15.8 1.60 18.6 1.64 21.0 1.73 21.6 1.76 24.5 1.83

65 10.5 1.05 13.2 1.31 16.5 1.55 19.2 1.60 21.6 1.69 22.3 1.71 25.0 1.80

NOTE: 1. IDB : Intake air dry-bulb temperature

TC : Total Capacity (x10

3

Btu/h) TPC : Total Power Consumption (kW)

2. Above data is for heating operation without any frost.

How to operate with fixed operational frequency of the compressor.

1. Press the EMERGENCY OPERATION switch on the front of the indoor unit, and select either EMERGENCY COOL

mode or EMERGENCY HEAT mode before starting to operate the air conditioner.

2. The compressor starts with operational frequency.

3. The fan speed of the indoor unit is High.

4. This operation continues for 30 minutes.

5. In order to release this operation, press the EMERGENCY OPERATION switch twice or once, or press any button on

the remote controller.

OBH753B

14

7-2. PERFORMANCE CURVE

Cooling

This value of frequency is not the same as the actual frequency in operating. Refer to 7-5 and 7-6 for the relationships

between frequency and capacity.

71

67

63

65 75 85 95 105 115

0.6

0.7

0.8

0.9

1.0

1.1

Indoor intake air WB temperature (°F)

SHF at rating condition = 0.70

= 417 CFM

Airflow

Outdoor intake air DB temperature (°F)

Total power consumption

(kW)

MUFZ-KJ12NAHZ

MUFZ-KJ15NAHZ

Cooling capacity (

at Rated frequency)

0.9

1.0

1.1

1.2

1.3

1.4

1.5

14 23 32 41 50 59 68 77 86 95 104 113

Outdoor intake air DB temperature(°F)

Capacity correction factors

76

75

68

64

72

Indoor intake air Wet-bulb

temperature( F)

Indoor air Wet-bulb temperature

difference (°F)

71

67

63

65 75 85 95 105 115

0.8

0.9

1.0

1.1

1.2

1.3

1.4

Indoor intake air WB temperature (°F)

SHF at rating condition = 0.66

= 431 CFM

Airflow

Outdoor intake air DB temperature (°F)

Total power consumption

(kW)

71

67

63

65 75 85 95 105 115

0.9

1.0

1.1

1.2

1.3

1.4

1.5

1.6

Indoor intake air WB temperature (°F)

SHF at rating condition = 0.65

= 491 CFM

Airflow

Outdoor intake air DB temperature (°F)

Total power consumption

(kW)

71

67

63

65 75 85 95 105 115

0.4

0.5

0.6

0.7

0.8

Indoor intake air WB temperature (°F)

SHF at rating condition = 0.79

= 417 CFM

Airflow

Outdoor intake air DB temperature (°F)

Total power consumption

(kW)

MUFZ-KJ09NAHZ

MUFZ-KJ18NAHZ

OBH753B

15

Heating

MUFZ-KJ09NAHZ

MUFZ-KJ15NAHZ

MUFZ-KJ12NAHZ

MUFZ-KJ18NAHZ

This value of frequency is not the same as the actual frequency in operating. Refer to 7-5 and 7-6 for the relationships

between frequency and capacity.

0%

20%

40%

60%

80%

100%

120%

% Heating Capacity

HEATING CAPACITY

Outdoor Temperature Degrees (°F)

-13.0 -4.0 5.0 14.0 23.0 32.0 41.0 50.0 69.8 75.0

%001%001%001%001%001%001%001%001%38%66

% Heating Capacity

-13

Outdoor Temperature Degrees (°F)

-5 5 15253545556575

0.00

0.50

1.00

1.50

2.00

2.50

-5 5 15253545556575-13

Heating Max Input (kW)

Dry-bulb temperature difference (ÛF)

0%

20%

40%

60%

80%

100%

120%

% Heating Capacity

HEATING CAPACITY

Outdoor Temperature Degrees (°F)

-13.0 -4.0 5.0 14.0 23.0 32.0 41.0 50.0 69.8 75.0

%001%001%001%001%001%001%001%001%88%77

% Heating Capacity

-13

Outdoor Temperature Degrees (°F)

-5 5 15253545556575

0.00

0.50

1.00

1.50

2.00

2.50

3.00

3.50

4.00

-13

-5 5 15253545556575

Heating Max Capacity (Btu/h)

Dry-bulb temperature difference (°F)

0%

20%

40%

60%

80%

100%

120%

% Heating Capacity

HEATING CAPACITY

Outdoor Temperature Degrees (°F)

-13.0 -4.0 5.0 14.0 23.0 32.0 41.0 50.0 69.8 75.0

%001%001%001%001%001%001%001%001%38%56

% Heating Capacity

-13

Outdoor Temperature Degrees (°F)

-5 5 15253545556575

0.00

0.50

1.00

1.50

2.00

2.50

3.00

-13

-5 5 15253545556575

Heating Max Input (kW)

Dry-bulb temperature difference (°F)

0%

20%

40%

60%

80%

100%

120%

-13

% Heating Capacity

HEATING CAPACITY

Outdoor Temperature Degrees (°F)

-13.0 -4.0 5.0 14.0 23.0 32.0 41.0 50.0 69.8 75.0

%001%001%001%001%001%001%001%001%88%77

% Heating Capacity

Outdoor Temperature Degrees (°F)

-5 5 15253545556575

0.00

0.50

1.00

1.50

2.00

2.50

3.00

3.50

4.00

-13

-5 5 15253545556575

Heating Max Capacity (Btu/h)

Dry-bulb temperature difference (°F)

OBH753B

16

7-3. CONDENSING PRESSURE

Cooling

Data are based on the condition of indoor humidity 50 %.

Air flow should be set to High speed.

65 70 75 80 85 90 95 100 105

250

300

350

400

450

(°F) (°F)

65 70 75 80 85 90 95 100 105

120

130

140

150

160

170

180

190

200

(PSIG)

Condensing pressure

Suction pressure

Outdoor ambient temperature

Indoor DB temperature (°F)

(PSIG)

Indoor DB temperature (°F)

Outdoor ambient temperature

86

80

75

70

86

80

75

70

MUFZ-KJ09NAHZ

MUFZ-KJ12NAHZ

65 70 75 80 85 90 95 100 105

250

300

350

400

450

500

(°F) (°F)

65 70 75 80 85 90 95 100 105

100

120

140

160

180

200

(PSIG)

Condensing pressure

Suction pressure

Outdoor ambient temperature

Indoor DB temperature (°F)

(PSIG)

Indoor DB temperature (°F)

Outdoor ambient temperature

86

80

75

70

86

80

75

70

65 70 75 80 85 90 95 100 105

250

290

330

370

410

450

(°F) (°F)

65 70 75 80 85 90 95 100 105

120

130

140

150

160

170

180

(PSIG)

Condensing pressure

Suction pressure

Outdoor ambient temperature

Indoor DB temperature (°F)

(PSIG)

Indoor DB temperature (°F)

Outdoor ambient temperature

86

80

75

70

86

80

75

70

MUFZ-KJ15NAHZ

65 70 75 80 85 90 95 100 105

250

290

330

370

410

450

(°F) (°F)

65 70 75 80 85 90 95 100 105

120

130

140

150

160

170

180

(PSIG)

Condensing pressure

Suction pressure

Outdoor ambient temperature

Indoor DB temperature (°F)

(PSIG)

Indoor DB temperature (°F)

Outdoor ambient temperature

86

80

75

70

86

80

75

70

MUFZ-KJ18NAHZ

OBH753B

17

75

70

65

75

70

65

(PSIG)

Condensing pressure

Outdoor ambient temperature

(°F) (°F)

(PSIG)

Suction pressure

Outdoor ambient temperature

5 15253545556575

250

300

350

400

450

500

Indoor DB temperature (°F)

5 15253545556575

60

85

110

135

160

185

210

Indoor DB temperature (°F)

MUFZ-KJ15NAHZ

75

70

65

75

70

65

(PSIG)

Condensing pressure

Outdoor ambient temperature

(°F) (°F)

(PSIG)

Suction pressure

Outdoor ambient temperature

5 15253545556575

300

350

400

450

500

550

600

Indoor DB temperature (°F)

5 15253545556575

60

85

110

135

160

185

210

Indoor DB temperature (°F)

MUFZ-KJ12NAHZ

75

70

65

75

70

65

(PSIG)

Condensing pressure

Outdoor ambient temperature

(°F) (°F)

(PSIG)

Suction pressure

Outdoor ambient temperature

5 15253545556575

250

290

330

370

410

450

Indoor DB temperature (°F)

5 15253545556575

50

70

90

110

130

150

170

190

210

Indoor DB temperature (°F)

MUFZ-KJ09NAHZ

Heating

Data are based on the condition of outdoor humidity 75%.

Air flow should be set to High speed.

Data are for heating operation without any frost.

75

70

65

75

70

65

(PSIG)

Condensing pressure

Outdoor ambient temperature

(°F) (°F)

(PSIG)

Suction pressure

Outdoor ambient temperature

5 15253545556575

300

370

440

510

580

650

Indoor DB temperature (°F)

5 15253545556575

60

85

110

135

160

185

210

Indoor DB temperature (°F)

MUFZ-KJ18NAHZ

OBH753B

18

7-4. STANDARD OPERATION DATA

Model MFZ-KJ09NA MFZ-KJ12NA MFZ-KJ15NA MFZ-KJ18NA

Item Unit Cooling Heating Cooling Heating Cooling Heating Cooling Heating

Total

Capacity Btu/h 9,000 11,000 12,000 13,000 15,000 18,000 17,000 21,000

SHF — 0.79 — 0.70 — 0.66 — 0.65 —

Input kW 0.570 0.750 0.890 0.900 1.120 1.140 1.350 1.730

Rated frequency Hz 33 45 46 53 48 57 56 62

Electrical circuit

Indoor unit MFZ-KJ09NA MFZ-KJ12NA MFZ-KJ15NA MFZ-KJ18NA

Power supply

V,

phase,

Hz

208/230, 1, 60

Input kW 0.025 0.025 0.027 0.047

Fan motor current A 0.26/0.23 0.26/0.23 0.28/0.35 0.48/0.43

Outdoor unit MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ

Power supply

V,

phase,

Hz

208/230, 1, 60

Input kW 0.545 0.725 0.865 0.875 1.093 1.376 1.303 1.687

Comp. current A 2.21/2.00 3.09/2.79 3.75/3.39 3.81/3.45 4.05/3.63 5.38/4.86 5.05/4.54 6.87/6.22

Fan motor current A 0.41/0.37 0.40/0.36 0.41/0.37 0.40/0.36 1.21/1.09 1.24/1.12 1.21/1.09 1.24/1.12

Refrigerant circuit

Condensing

pressure

PSIG 377 331 401 360 382 414 388 441

Suction

pressure

PSIG 172 126 159 121 158 127 154 124

Discharge

temperature

˚F 141 117 150 142 149 166 150 178

Condensing

temperature

˚F 109 98 113 104 110 112 111 117

Suction

temperature

˚F6037523655385141

Comp. shell bottom

temperature

˚F 131 109 141 132 140 156 143 168

Ref. pipe length ft. 25

Refrigerant charge (R410A) 2 lb. 10oz 3 lb 5 oz.

Indoor unit

Intake air

temperature

DB ˚F8070807080708070

WB ˚F6760676067606760

Discharge air

temperature

DB ˚F 61 95 58 101 56 110 56 115

WB ˚F 60 — 57 — 55 — 55 —

Fan speed (High) rpm 1,080 1,080 1,080 1,080 1,110 1,200 1,240 1,200

Airﬂ ow (High) CFM 354 (Wet) 417 354 (Wet) 417 366 (Wet) 470 417 (Wet) 470

Outdoor unit

Intake air

temperature

DB ˚F9547954795479547

WB ˚F — 43 — 43 — 43 — 43

Fan speed rpm 810 900 810 900 820 860 820 860

Airﬂ ow CFM 1,074 1,202 1,074 1,202 1,653 1,730 1,653 1,730

OBH753B

19

7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY

Capacity correction factors

Input correction factors

Capacity correction factors

Correction of Cooling capacity

The operational frequency of compressor

Correction of Cooling total input

The operational frequency of compressor

Correction of Heating total input

The operational frequency of compressor

Correction of Heating capacity

The operational frequency of compressor

MUFZ-KJ09NAHZ

(Hz) (Hz)

MUFZ-KJ12NAHZ

Capacity correction factors

Input correction factors

Capacity correction factors

Correction of Cooling capacity

The operational frequency of compressor

Correction of Cooling total input

The operational frequency of compressor

Correction of Heating total input

The operational frequency of compressor

Correction of Heating capacity

The operational frequency of compressor

(Hz) (Hz)

MUFZ-KJ15NAHZ

Capacity correction factors

Input correction factors

Capacity correction factors

Correction of Cooling capacity

The operational frequency of compressor

Correction of Cooling total input

The operational frequency of compressor

Correction of Heating total input

The operational frequency of compressor

Correction of Heating capacity

The operational frequency of compressor

(Hz) (Hz)

0 255075100

0.5

1.0

1.5

2.0

0 25 50 75 100

0.5

1.0

1.5

2.0

2.5

0 255075100

0.5

1.0

1.5

2.0

0 255075100

0.7

1.4

2.1

2.8

3.5

0 255075100

0.5

1.0

1.5

2.0

0 25 50 75 100

0.5

1.0

1.5

2.0

0 255075100

0.5

1.0

1.5

2.0

0 255075100

0.5

1.0

1.5

2.0

2.5

3.0

0 255075100

0.5

1.0

1.5

2.0

0 25 50 75 100

0.5

1.0

1.5

2.0

0 255075100

0.0

0.5

1.0

1.5

2.0

0 255075100

0.5

1.0

1.5

2.0

2.5

3.0

MUFZ-KJ18NAHZ

Capacity correction factors

Input correction factors

Capacity correction factors

Correction of Cooling capacity

The operational frequency of compressor

Correction of Cooling total input

The operational frequency of compressor

Correction of Heating total input

The operational frequency of compressor

Correction of Heating capacity

The operational frequency of compressor

(Hz) (Hz)

0 255075100

0.5

1.0

1.5

2.0

0 25 50 75 100

0.5

1.0

1.5

2.0

0 255075100

0.5

1.0

1.5

2.0

0 255075100

0.5

1.0

1.5

2.0

2.5

7-6. HOW TO OPERATE FIXED-FREQUENCY OPERATION (Test run operation)

1. Press EMERGENCY OPERATION switch to start COOL or HEAT mode (COOL: Press once, HEAT: Press twice).

2. Test run operation starts and continues to operate for 30 minutes.

3. Compressor operates at rated frequency in COOL mode or 58 Hz in HEAT mode. (Refer to 7-4.)

4. Indoor fan operates at High speed.

5.

After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts (operation frequency of compressor varies).

6. To cancel test run operation (EMERGENCY OPERATION), press EMERGENCY OPERATION switch or any button on

remote controller.

OBH753B

20

8

ACTUATOR CONTROL

8-2. R.V. COIL CONTROL

Heating

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

ON

Cooling

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

OFF

Dry

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

OFF

NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor.

ON

OFF

ON

OFF

Outdoor fan

motor

Compressor

5 seconds 15 seconds

8-1. OUTDOOR FAN MOTOR CONTROL

The fan motor turns ON/OFF, interlocking with the compressor.

[ON] The fan motor turns ON 5 seconds before the compressor starts up.

[OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running.

8-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR

Sensor Purpose

Actuator

Compressor

LEV

Outdoor fan

motor

R.V.coil

Indoor fan

motor

Defrost

heater

Discharge temperature

thermistor

Protection

○○

Indoor coil temperature

thermistor

Cooling: Coil frost prevention

○

Heating: High pressure protec-

tion

○○

Defrost thermistor Heating: Defrosting

○○○○○

Fin temperature thermistor Protection

○○

Ambient temperature

thermistor

Cooling: Low ambient tempera-

ture operation

○○○

Heating: Defrosting (Heater)

○

Outdoor heat exchanger tem-

perature thermistor

Cooling: Low ambient tempera-

ture operation

○○○

Cooling: High pressure protec-

tion

○○○

ON

OFF

Compressor

Outdoor fan

motor

R.V.coil

ON

OFF

ON

OFF

<COOL>

5 seconds

<HEAT>

5 seconds

MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ

OBH753B

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Mitsubishi Electric MUFZ-KJ09NAHZ Owner's manual

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