Mitsubishi Electric Mr.Slim MUZ-FE09NA User manual

HFC
utilized
R410A
MUZ-FE09NA
MUZ-FE12NA
MUZ-FE09NA - 1
MUZ-FE12NA1
MUZ-FE09NAH
MUZ-FE12NAH
TM
OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-FE09NA
MUZ-FE09NA - 1
MUZ-FE09NAH
MUZ-FE12NA
MUZ-FE12NA1
MUZ-FE12NAH
MUZ-FE18NA
No. OBH543
REVISED EDITION-G
OBH543 REVISED EDITION-F is void.
Revision G:
• A warning when opening or closing the
valve has been added.
Indoor unit service manual
MSZ-FE•NA Series (OBH542)
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 ·············9
7. DATA······················································ 11
8. ACTUATOR CONTROL ····························· 18
9. SERVICE FUNCTIONS······························ 19
10. TROUBLESHOOTING ······························· 19
11. DISASSEMBLY INSTRUCTIONS················· 38
PARTS CATALOG (OBB543)

2
Revision A:
• MUZ-FE18NA has been added.
Revision B:
• MUZ-FE09NA - 1and MUZ-FE12NA1 have been added.
Use the speci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.
Revision C:
• Specification has been corrected.
[Capacity Rated Capacity Rated (Maximum), Power consumption Rated Power consumption Rated (Maximum)]
Revision D:
• MUZ-FE09NAH and MUZ-FE12NAH have been added.
Revision E:
• The formula for calculating the additional refrigerant charge has been corrected.
Revision F:
• The descriptions of the expansion valve coil have been corrected. (10-4.)
• Some descriptions have been modified.
Revision G:
• A warning when opening or closing the valve has been added.
<Preparation before the repair service>
Prepare the proper tools.
Prepare the proper protectors.
Provide adequate ventilation.
After stopping the operation of the air conditioner, turn off the power-supply breaker and pull the power plug.
Discharge the capacitor before the work involving the electric parts.
<Precautions during the repair service>
Do not perform the work involving the electric parts with wet hands.
Do not pour water into the electric parts.
Do not touch the refrigerant.
Do not touch the hot or cold areas in the refrigeration cycle.
When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to
touch the live parts.
WARNING
• When the refrigeration circuit has a leak, do not execute pump down with the
compressor.
• When pumping down the refrigerant, stop the compressor before disconnecting the
refrigerant pipes. The compressor may burst if air etc. get into it.
• When opening or closing the valve below freezing temperatures, refrigerant may
spurt out from the gap between the valve stem and the valve body, resulting in injuries.
OBH543G

3
1TECHNICAL CHANGES
MUZ-FE09NA
MUZ-FE12NA
MUZ-FE18NA
1. New model
MUZ-FE09NA MUZ-FE09NAH MUZ-FE12NA MUZ-FE12NA1 MUZ-FE12NAH
Piping
Air outlet
Drain outlet
Air inlet
(back and side)
Drain hose
MUZ-FE18NA
Piping
Air outlet
Drain outlet
Air inlet
(back and side)
Drain hose
PART NAMES AND FUNCTIONS
2
MUZ-FE09NA MUZ-FE09NA - 1
MUZ-FE12NA MUZ-FE12NA1
1. Compressor has been changed.
2. Inverter P.C. board has been changed.
MUZ-FE09NA - 1MUZ-FE09NAH
MUZ-FE12NA1 MUZ-FE12NAH
1. Defrost heater has been added.
2. Inverter P.C. board has been changed.
OBH543G

4
3SPECIFICATION
Outdoor unit model MUZ-FE09NA
MUZ-FE09NAH
MUZ-FE12NA
MUZ-FE12NA1
MUZ-FE12NAH
MUZ-FE18NA
Capacity
Rated (Minimum~Maximum)
Cooling *1 Btu/h 9,000 (2,800~9,000) 12,000 (2,800~12,000) 18,000 (8,200~25,200)
Heating 47 *1 Btu/h 10,900 (3,000~18,000) 13,600 (3,000~21,000) 21,600 (7,500~29,700)
Capacity
Rated (Maximum) Heating 17 *2 Btu/h 6,700 (12,500) 12NA 8,300(13,600) 11,700 (21,600)
12NA1 7,900(13,600)
Power consumption
Rated (Minimum~Maximum)
Cooling *1 W
580 (160~650) 930 (160~960) 1,270 (570~2,280)
Heating 47 *1 W
710 (150~2,250) 950 (150~2,250) 1,540 (520~2,420)
Power consumption
Rated (Maximum) Heating 17 *2 W 650 (1,730) 12NA 800(1,780) 1,240 (2,620)
12NA1 750(1,780)
EER *1 [SEER] *3 Cooling 15.5 [26.0] 12.9 [23.0] 14.2 [20.2]
HSPF IV *4Heating 10.0
12NA 10.6 10.3
12NA1 10.5
12NAH 10.1
COP Heating *1 4.50 4.20 4.11
Power supply V , phase , Hz 208/230, 1 , 60
Max. fuse size (time delay) A 15 20
Min. circuit ampacity A 12 17.1
Fan motor F.L.A 0.56 0.93
Compressor
Model
09NA
12NA SNB130FQAH
SNB172FQKMT
09NA -
1
,
09NAH
12NA1, 12NAH
SNB130FQBHT
R.L.A 8.6 12.9
L.R.A 10.8 16.1
Refrigeration oil L (Model) 0.45 (NEO22) 0.40 (FV50S)
Refrigerant control Linear expansion valve
Sound level *1Cooling dB(A) 48 48 55
Heating dB(A) 49 49 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. 80 119
External nish Munsell 3Y 7.8/1.1
Remote controller Wireless type
Control voltage
(by built-in transformer) V DC 12 - 24
Refrigerant piping Not supplied
Refrigerant pipe size
(Min. wall thickness)
Liquid in. 1/4 (0.0315) 3/8 (0.0315)
Gas in. 3/8 (0.0315) 5/8 (0.0315)
Connection method Indoor Flared Flared
Outdoor Flared Flared
Between the indoor
& outdoor units
Height di󰀨erence ft. 40 50
Piping length ft. 65 100
Refrigerant charge (R410A) 2 lb. 9 oz. 4 lb. 3 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: Rating conditions (Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 17˚FDB, 15˚FWB
OBH543G

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
= ("Cooling 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 -15
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
OBH543G

6
OUTLINES AND DIMENSIONS
4
Unit: inch
MUZ-FE09NA MUZ-FE09NAH MUZ-FE12NA MUZ-FE12NA1 MUZ-FE12NAH
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
29/32 11-1/4
Air in
handle
Air in
Air out
2- 3/8 13/16 Oval hole
Drain hole 1-5/8 (FE09/12NA)
Drain hole 1-5/16 (FE09/12NAH)
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.
MUZ-FE18NA
16-7/16
1-9/16
1-5/8
Drain hole
6-7/8 19-11/16
13
2
Air in
Air out
2-holes 13/32 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 3/8
Gas refrigerant
pipe joint
Refrigerant pipe
(flared) Ø 5/8
14 in. or more
4 in. or more
REQUIRED SPACE
20 in. or more
4 in. or more
20 in. or more
OBH543G

7
5WIRING DIAGRAM
MUZ-FE09NA MUZ-FE12NA
MUZ-FE09NA - 1MUZ-FE12NA1
OBH543G

8
MUZ-FE18NA
MUZ-FE09NAH MUZ-FE12NAH
OBH543G

9
6REFRIGERANT SYSTEM DIAGRAM
Unit: inch
MUZ-FE09NA MUZ-FE09NAH MUZ-FE12NA MUZ-FE12NA1 MUZ-FE12NAH
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 ø1/4
(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
MUZ-FE18NA
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT61
Discharge
temperature
thermistor
RT62
Flared connection
Stop valve
Stop valve
(with service port)
Capillary tube
O.D. 0.157 × I.D. 0.094× 3-15/16
(ø4.0×ø2.4×100)
Compressor
4-way valve
Refrigerant pipe
ø 5/8
(with heat insulator)
Refrigerant pipe ø 3/8
(with heat insulator)
LEV
R.V. coil
heating ON
cooling OFF
Muffler
#100
Strainer
#100
Outdoor heat
exchanger
temperature
thermistor
RT68
Ambient
temperature
thermistor
RT65
Strainer
#100
Refrigerant flow in cooling
Refrigerant flow in heating
Service
port
Service
port
OBH543G

10
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 di󰀨erence
B Gas Liquid
MUZ-FE09NA
MUZ-FE09NAH
MUZ-FE12NA
MUZ-FE12NA1
MUZ-FE12NAH
65 40 3/8 1/4
MUZ-FE18NA 100 50 5/8 3/8
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-FE09NA
MUZ-FE09NAH
MUZ-FE12NA
MUZ-FE12NA1
MUZ-FE12NAH
2 lb. 9 oz. 0 1.62 4.86 8.10 11.34 12.96
Calculation: X oz. = 1.62/5 oz./ft. × (Refrigerant piping length (ft.) - 25)
NOTE: Refrigerant piping exceeding 33 ft. requires additional refrigerant charge according to the calculation.
Model Outdoor unit
precharged
Refrigerant piping length (one way): ft.
33 40 50 60 70 80 90 100
MUZ-FE18NA 4 lb. 3 oz. 0 4.14 10.06 15.98 21.90 27.82 33.74 39.66
Calculation: X oz. = 2.96/5 oz./ft. × (Refrigerant piping length (ft.) - 33)
OBH543G