Mitsubishi Electric Mr.Slim MUZ-FD09NA-U1 User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS····················· 3
3. SPECIFICATION················································ 4
4. OUTLINES AND DIMENSIONS ························ 6
5. WIRING DIAGRAM············································ 7
6. REFRIGERANT SYSTEM DIAGRAM··············· 8
7. DATA·································································· 9
8. ACTUATOR CONTROL··································· 15
9. SERVICE FUNCTIONS ··································· 16
10. TROUBLESHOOTING····································· 16
11. DISASSEMBLY INSTRUCTIONS···················· 32
Wireless type
Models
MUZ-FD09NA
MUZ-FD09NA- U1
MUZ-FD12NA
MUZ-FD12NA- U1
OUTDOOR UNIT
Indoor unit service manual
MSZ-FD•NA Series (OBH497)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
TM
HFC
utilized
R410A
No. OBH498
PARTS CATALOG (OBB498)

2

33
1TECHNICAL CHANGES
MUZ-FD09NA
MUZ-FD12NA
MUZ-FD09NA - U1
1. New model
PART NAMES AND FUNCTIONS
2
MUZ-FD09NA
MUZ-FD12NA
MUZ-FD12NA - U1
Air outlet
Drain outlet
Piping
Drain hose
Air inlet

44
3SPECIFICATION
Outdoor unit model MUZ-FD09NA MUZ-FD12NA
Capacity
Rated (Minimum~Maximum) Cooling 1 Btu/h 9,000 (2,800~9,000) 12,000 (2,800~12,000)
Heating 47 1 Btu/h 10,900 (3,000~18,000) 13,600 (3,000~21,000)
Capacity Rated Heating 17 2 Btu/h 12,500 13,600
Power consumption
Rated (Minimum~Maximum) Cooling 1 W
650 (160~650) 960 (160~960)
Heating 47 1 W
750 (150~2,400) 980 (150~2,400)
Power consumption Rated Heating 17 2 W 1,730 1,780
EER 1 [SEER] 3 Cooling 13.8 [23.0] 12.5 [22.0]
HSPF IV(V) 4 Heating 10.55 (7.4) 10.55 (7.4)
COP Heating 1 4.30 4.10
External finish Munsell 3Y 7.8/1.1
Power supply V , phase , Hz 208/230 , 1 , 60
Max. fuse size (time delay) A 15
Min. circuit ampacity A 12
Fan motor F.L.A 0.56
Compressor Model SNB130FQAH R.L.A 8.6
L.R.A 10.8
Refrigerant control Liner expansion valve
Sound level 1Cooling dB(A) 48 48
Heating dB(A) 49 49
Defrost method Reverse cycle
Dimensions W in. 31-1/2 D in. 11-1/4
H in. 21-5/8
Weight Ib. 80
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)
Connection method Indoor Flared
Outdoor Flared
Between the indoor &
outdoor units Height differ-
ence ft. 40
Piping length ft. 65
Refrigerant charge (R410A) 2 lb. 9 oz.
Refrigeration oil (Model) NE022
NOTE : Test conditions are based on ARI 210/240.
1 : Rating conditions(Cooling) — Indoor : 80 ˚FDB, 67 ˚FWB, Outdoor : 95 ˚FDB, (75 ˚FWB)Rated frequency
(Heating) — Indoor : 70 ˚FDB, 60 ˚FWB, Outdoor : 47 ˚FDB, 43 ˚FWB Rated frequency
2 : (Heating) — Indoor : 70 ˚FDB, 60 ˚FWB, Outdoor : 17 ˚FDB, 15 ˚FWBMaximum frequency

55
Test condition
ARI Mode Test Indoor air condition Outdoor air condition
Dry bulb (°F) Wet bulb (°F) Dry bulb (°F) Wet bulb (°F)
SEER
(Cooling)
"A" 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)
Low ambient Cooling Steady State
at minimum compressor Speed 80 67 67 (53.5)
Intermediate Cooling Steady State
at Intermediate compressor Speed 5 80 67 87 (69)
HSPF
(Heating)
Standard Rating-Heating
at rated compressor Speed 70 60 47 43
Low temperature Heating
at rated compressor Speed 70 60 17 15
Max temperature Heating
at minimum compressor Speed 70 60 62 56.5
High temperature Heating
at minimum compressor Speed 70 60 47 43
Frost Accumulation
at rated compressor Speed 70 60 35 33
Frost Accumulation
at Intermediate compressor Speed 5 70 60 35 33
5: At Intermediate compressor Speed
=("Cooling rated compressor speed" - "minimum compressor speed") / 3 + "minimum compressor speed".
3, 4
OPERATING RANGE
(1) POWER SUPPLY
(2) OPERATION
Mode Condition
Intake air temperature (°F)
lndoor 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 14 13
Rated voltage Guaranteed Voltage
Outdoor unit
208/230 V
1 phase
60 Hz
Min.187 V 208 V 230 V Max.253 V

66
OUTLINES AND DIMENSIONS
4
Unit: inch
MUZ-FD09NA
MUZ-FD12NA
Liquid pipe :1/4 (flared)
Gas pipe :3/8 (flared)
6-23/32
2
5-7/8
2-23/32
1-3/4
15-3/4
12 ~ 12-3/4
13-9/16
11/16
1-9/16
7/8
21-5/8
11-1/32
13/32
31-1/2
19-11/16
5-15/16
11-29/32
17/3229/32 11-1/4
Air in
handle
Air in
Air out
2- 3/8 13/16 Oval hole
Drain hole 1-5/8
REQUIRED SPACE Basically open 4 inch or more
without any obstruction in front
and on both sides of the unit.
14 in. or more
8 in. or more
4 in. or more
4 in. or more
Open two sides of left,
right, or rear side.

77
5WIRING DIAGRAM
MUZ-FD09NA MUZ-FD12NA

8
6REFRIGERANT SYSTEM DIAGRAM
Unit:inch
MUZ-FD09NA
MUZ-FD12NA
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT61
Discharge
temperature
thermistor
RT62
Service
port
Service
port
Flared connection Stop valve
(with strainer)
Stop valve
(with service port)
Refrigerant flow in cooling
Compressor
4-way valve
Refrigerant flow in heating
Refrigerant pipe ø 3/8
(with heat insulator)
Refrigerant pipe 1/4
(with heat insulator)
R.V. coil
heating ON
cooling OFF
Strainer
#100
Capillary tube
Expansion
valve
Ambient
temperature
thermistor
RT65
Muffler
O.D. 0.118 × I.D. 0.071
× 23-5/8
(ø
3.0 × ø 1.8 × 600 )
Capillary tube
O.D. 0.118 ×I.D. 0.079
×9-7/16
(ø3.0 × ø2.0 ×240)
Outdoor heat
exchanger
temperature
thermistor
RT68
Muffler
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
MUZ-FD09NA
MUZ-FD12NA 65 40 3/8 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
MUZ-FD09NA
MUZ-FD12NA 2 lb. 9 oz. 0 1.62 4.86 8.10 11.34 12.96
Calculation : X oz. = 1.62/ 5 oz./ ft x (Refrigerant piping length (ft) - 25)
NOTE : Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation.

9
DATA7
MUZ-FD09NA MUZ-FD12NA
7-1. PERFORMANCE DATA
1) COOLING CAPACITY
Model
Indoor air Outdoor intake air DB temperature (˚F)
IWB 75 85 95 105 115
(˚F) TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC
MUZ-FD09NA 71 11.0 6.9 0.58 10.3 6.5 0.63 9.7 6.1 0.68 9.0 5.6 0.72 8.3 5.2 0.75 67 10.4 7.9 0.55 9.7 7.4 0.60 9.0 6.8 0.65 8.4 6.4 0.69 7.7 5.8 0.72
63 9.8 8.8 0.52 9.1 8.1 0.58 8.5 7.6 0.62 7.7 6.9 0.66 7.0 6.3 0.69
MUZ-FD12NA
71 14.7 8.8 0.85 13.7 8.2 0.94 12.9 7.7 1.01 12.0 7.2 1.06 11.0 6.6 1.10
67 13.9 10.2 0.81 13.0 9.5 0.89 12.0 8.8 0.96 11.2 8.1 1.02 10.3 7.5 1.07
63 13.1 11.3 0.77 12.1 10.5 0.85 11.3 9.7 0.92 10.3 8.9 0.98 9.4 8.1 1.02
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
MUZ-FD09NA
MUY-FD12NA 1.0 0.954 0.878
3) HEATING CAPACITY
Model
Indoor air Outdoor intake air WB temperature (˚F)
IDB 15 25 35 43 45 55
(˚F) TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC
MUZ-FD09NA 75 6.3 0.56 7.9 0.66 9.4 0.73 10.6 0.77 11.0 0.78 12.4 0.81 70 6.7 0.54 8.2 0.64 9.6 0.71 10.9 0.75 11.2 0.77 12.7 0.80
65 6.9 0.52 8.6 0.62 10.0 0.69 11.2 0.73 11.6 0.74 13.0 0.78
MUZ-FD12NA 75 7.9 0.73 9.9 0.86 11.8 0.96 13.3 1.00 13.7 1.02 15.5 1.06 70 8.4 0.71 10.2 0.84 12.0 0.93 13.6 0.98 14.0 1.00 15.8 1.04
65 8.6 0.68 10.7 0.81 12.4 0.91 14.0 0.96 14.4 0.97 16.2 1.02
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.

1010
7-2. PERFORMANCE CURVE
6570 75
75
70
65
12
10
6
8
Indoor intake air DB temperature (°F)
= 381 CFM
Airflow
15 25 35 45 55
Outdoor intake air WB temperature (°F)
0.4
0.6
0.8
Indoor intake air DB temperature (°F)
Total power consumption
(kW) Total capacity
(10
3Btu/h)
65
70
75
75
70
65
20
18
16
14
8
6
12
10
1.1
0.6
Indoor intake air DB temperature (°F)
= 420 CFM
Airflow
15 25 35 45 55
Outdoor intake air WB temperature (°F)
0.7
0.8
0.9
1.0
Indoor intake air DB temperature (°F)
Total power consumption
(kW) Total capacity
(10
3Btu/h)
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
71
67
63
13
12
11
10
7
9
8
0.7
0.6
0.5
Indoor intake air WB temperature (°F)
Indoor intake air WB temperature (°F)
SHF at rating condition = 0.76
= 307 CFM
Airflow
65 75 85 95 105 115
Outdoor intake air DB temperature (°F)
Total power consumption
(kW) Total capacity
(10
3Btu/h)
71
63
67
71
63
67
14
15
12
10
13
11
9
1.2
1.1
1.0
0.9
0.8
0.7
Indoor intake air WB temperature (°F)
Indoor intake air WB temperature (°F)
SHF at rating condition = 0.73
= 350 CFM
Airflow
65 75 85 95 105 115
Outdoor intake air DB temperature (°F)
Total power consumption
(kW) Total capacity
(10
3Btu/h)
MUZ-FD09NA MUZ-FD12NA
Heating
MUZ-FD09NA MUZ-FD12NA