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