Mitsubishi Electric MUFZ-KJ09NAHZ User manual

SERVICE MANUAL
Models
OUTDOOR UNIT
Indoor unit service manual
MFZ-KJ•NA Series (OBH752)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
HFC
utilized
R410A
PARTS CATALOG (OBB753)
MUFZ-KJ09NAHZ
MUFZ-KJ12NAHZ
MUFZ-KJ09NAHZ -U1
MUFZ-KJ12NAHZ -U1
MUFZ-KJ15NAHZ -U1
MUFZ-KJ18NAHZ -U1
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
No. OBH753
REVISED EDITION-A
Revision A:
• 3. SPECIFICATION and 7-2. PERFORMANCE
CURVE has been modified.
Please void OBH753.

2
1TECHNICAL CHANGES
Use the specified 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.
OBH753A

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)
OBH753A

4
3SPECIFICATION
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 W570
(180 - 1,250)
890
(180 - 1,380)
1,120
(420 - 1,850)
1,350
(420 - 2,320)
Heating 47 1 W750
(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 4Heating 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 floz. (L) (Model) 11.8 (0.35)/(FV50S) 13.5 (0.40)/(FV50S)
Refrigerant control Linear expansion valve
Sound level 1Cooling 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 finish 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
OBH753A

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
OBH753A

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
OBH753A

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 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
OBH753A

8
5WIRING DIAGRAM
MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ
OBH753A

9
MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ
OBH753A

10
6REFRIGERANT 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
OBH753A

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)
OBH753A

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 (x103Btu/h)
SHC : Sensible Heat Capacity (x103Btu/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 0.954 0.878 -
MUFZ-KJ15NAHZ
MUFZ-KJ18NAHZ 1.0 0.954 0.878 0.771
OBH753A

13
3) 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 (x103Btu/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.
OBH753A

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
OBH753A

15
Heating
MUFZ-KJ09NAHZ
MUFZ-KJ09NAHZ
MUFZ-KJ15NAHZ
MUFZ-KJ15NAHZ
MUFZ-KJ12NAHZ
MUFZ-KJ12NAHZ
MUFZ-KJ18NAHZ
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)
OBH753A

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
OBH753A

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
OBH753A

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
Airflow (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
Airflow CFM 1,074 1,202 1,074 1,202 1,653 1,730 1,653 1,730
OBH753A

19
7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY
Capacity correction factors
Input 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) (Hz) (Hz)
MUFZ-KJ12NAHZ
Capacity correction factors
Input 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) (Hz) (Hz)
MUFZ-KJ15NAHZ
Capacity correction factors
Input 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) (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
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) (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.
OBH753A

20
8ACTUATOR 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
OBH753A