Mitsubishi Electric MUZ-GL09NA-U8 User manual

HFC
utilized
R410A
INDOOR UNIT
SERVICE MANUAL
No. OBH733
REVISED EDITION-G
Indoor unit service manual
MSZ-GL•NA, MSY-GL•NA Series (OBH732)
MUZ-GL18/24NA
MUZ-GL18/24NAH
MUY-GL18/24NA
PARTS CATALOG (OBB733)
OBH733 REVISED EDITION-F is void.
Revision G:
• MUZ-GL09/12/15NA(H)- U2 and
MUY-GL09/12/15NA- U2 have been added.
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS····················· 3
3. SPECIFICATION················································ 4
4. OUTLINES AND DIMENSIONS ························ 7
5. WIRING DIAGRAM············································ 9
6. REFRIGERANT SYSTEM DIAGRAM ············· 21
7. DATA································································ 24
8. ACTUATOR CONTROL··································· 39
9. SERVICE FUNCTIONS ··································· 40
10. TROUBLESHOOTING····································· 41
11. DISASSEMBLY INSTRUCTIONS ···················· 65
OUTDOOR UNIT
Models
MUZ-GL09NA -
U1
,
U2
,
U8
MUZ-GL09NAH -
U1
,
U2
,
U8
MUY-GL09NA -
U1
,
U2
MUZ-GL12NA -
U1
,
U2
MUZ-GL12NAH -
U1
,
U2
MUY-GL12NA -
U1
,
U2
MUZ-GL15NA -
U1
,
U2
MUZ-GL15NAH -
U1
,
U2
MUY-GL15NA -
U1
,
U2
MUZ-GL18NA -
U1
MUZ-GL18NAH -
U1
MUY-GL18NA -
U1
MUZ-GL24NA -
U1
,
U2
MUZ-GL24NAH -
U1
MUY-GL24NA -
U1

2
1TECHNICAL CHANGES
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 A:
• MUZ-GL12/15NA-U1 , MUZ-GL12/15NAH-U1 and MUY-GL09/12/15NA-U1 have been added.
MUZ-GL09NA - U1 MUZ-GL09NAH - U1 MUY-GL09NA - U1
MUZ-GL09NA - U8 MUZ-GL09NAH - U8
MUZ-GL12NA - U1 MUZ-GL12NAH - U1 MUY-GL12NA - U1
MUZ-GL15NA - U1 MUZ-GL15NAH - U1 MUY-GL15NA - U1
MUZ-GL18NA - U1 MUZ-GL18NAH - U1 MUY-GL18NA - U1
MUZ-GL24NA - U1 ,U2 MUZ-GL24NAH - U1 MUY-GL24NA - U1
1. New model
Revision B:
• MUZ-GL09NA- U8 and MUZ-GL09NAH- U8 have been added.
Revision C:
• MUZ-GL09NA- U1 and MUZ-GL09NAH- U1 have been added.
Revision D:
• MUZ-GL24NAH- U1 has been added.
Revision E:
• Capacity corrections have been corrected [7-1. 2), 3)].
Revision F:
• MUZ-GL24NA- U2 has been added.
Revision G:
• MUZ-GL09/12/15NA(H)- U2 and MUY-GL09/12/15NA- U2 have been added.
MUZ-GL09NA - U1 MUZ-GL09NA - U2
MUZ-GL09NAH - U1 MUZ-GL09NAH - U2
1. Fan motor has been changed.
2. INVERTER P.C.BOARD has been changed.
3. EXPANSION VALVE has been changed.
4. 4-WAY VALVE has been changed.
5. R.V. COIL has been changed.
6. Compressor has been changed.
MUZ-GL12NA - U1 MUZ-GL12NA - U2
MUZ-GL12NAH - U1 MUZ-GL12NAH - U2
1. Fan motor has been changed.
2. INVERTER P.C.BOARD has been changed.
3. EXPANSION VALVE has been changed.
4. 4-WAY VALVE has been changed.
5. R.V. COIL has been changed.
MUY-GL09NA - U1 MUY-GL09NA - U2
1. Fan motor has been changed.
2. INVERTER P.C.BOARD has been changed.
3. EXPANSION VALVE has been changed.
4. 4-WAY VALVE has been changed.
5. Compressor has been changed.
6. Refrigerant charge has been changed.
MUY-GL12NA - U1 MUY-GL12NA - U2
1. Fan motor has been changed.
2. INVERTER P.C.BOARD has been changed.
3. EXPANSION VALVE has been changed.
4. 4-WAY VALVE has been changed.
MUZ-GL15NA - U1 MUZ-GL15NA - U2
MUZ-GL15NAH - U1 MUZ-GL15NAH - U2
MUY-GL15NA - U1 MUY-GL15NA - U2
1. Fan motor has been changed.
2. INVERTER P.C.BOARD has been changed.
3. EXPANSION VALVE has been changed.
OBH733G

3
MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA
MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA
Piping
Air outlet
Drain outlet
Air inlet
(back and side)
Drain hose
PART NAMES AND FUNCTIONS
2
MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA
MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA
MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
(back and side)
OBH733G

8
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-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 1/4 (GL18)
Refrigerant pipe (flared) Ø 3/8 (GL24)
Gas refrigerant pipe joint
Refrigerant pipe (flared) Ø 1/2 (GL18)
Refrigerant pipe (flared) Ø 5/8 (GL24)
*1 20 in. (500 mm) or more when front
and sides of the unit are clear
14 in. (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
MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA
MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA
OBH733G

15
MUZ-GL18NA
OBH733G

16
MUZ-GL18NAH
OBH733G

21
6REFRIGERANT SYSTEM DIAGRAM
Unit: Inch (mm)
MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT61
(MUZ)
Discharge
temperature
thermistor
RT62
Flared connection
Stop valve
Capillary tube
O.D. 0.157×
I.D. 0.094×
3-15/16
(ø 4.0 × ø 2.4 × 100)
Capillary tube
O.D. 0.157×
I.D. 0.094×7-7/8
(ø 4.0 × ø 2.4 × 200)
Refrigerant flow in cooling
Compressor
4-way
valve
Refrigerant flow in heating (MUZ)
Refrigerant pipe
ø1/2 ( ø 12.7)
(with heat insulator)
Refrigerant pipe ø1/4 ( ø 6.35)
(with heat insulator)
LEV
R.V. coil (MUZ)
heating ON
cooling OFF
Muffler
with #100 mesh strainer
Strainer
#100
Outdoor heat
exchanger
temperature
thermistor
RT68
Strainer
#100
Muffler
Capillary tube
O.D. 0.118×
I.D. 0.079× 7-7/8
(ø3.0×ø2.0×200(×4))
Stop valve
(with service port)
Service
port
Service port
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT61
(MUZ)
Discharge
temperature
thermistor
RT62
Flared connection
Stop valve
(with strainar)
Refrigerant flow in cooling
Compressor
4-way valve
Refrigerant flow in heating
(MUZ)
Refrigerant pipe ø1/4 (ø6.35)
(with heat insulator)
R.V. coil (MUZ)
heating ON
cooling OFF
Strainer
#100
LEV
Ambient
temperature
thermistor
RT65
Muffler
Capillary tube
O.D. 0.118 ×
I.D. 0.079 × 9-7/16
(
ø3.0 × ø2.0 × 240 )
(MUZ-GL09NA(H)- U1 , U2
MUY-GL09NA- U2 )
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
Refrigerant pipe ø3/8 (ø9.52) (GL09/12)
(with heat insulator)
ø1/2 (ø12.7) (GL15)
Stop valve
(with service port)
Capillary tube
O.D. 0.157 ×
I.D. 0.094 × 9-7/16
(
ø4.0 × ø2.4 × 240 )
(Other models )
Muffler
MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA
MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA
MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA
OBH733G

23
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-GL09NA
MUZ-GL09NAH
MUY-GL09NA
MUZ-GL12NA
MUZ-GL12NAH
MUY-GL12NA
65 40 3/8 1/4
MUZ-GL15NA
MUZ-GL15NAH
MUY-GL15NA
65 40 1/2 1/4
MUZ-GL18NA
MUZ-GL18NAH
MUY-GL18NA
100 50 1/2 1/4
MUZ-GL24NA
MUZ-GL24NAH
MUY-GL24NA
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-GL09NA
-
U1
MUZ-GL09NA -
U2
MUZ-GL09NAH -
U1
MUZ-GL09NAH -
U2
MUY-GL09NA -
U2
2 lb. 5 oz.
0 1.08 3.24 5.40 7.56 8.64
MUZ-GL09NA
-
U8
MUZ-GL09NAH -
U8
MUY-GL09NA -
U1
MUZ-GL12NA
MUZ-GL12NAH
MUY-GL12NA
MUZ-GL15NA
MUZ-GL15NAH
MUY-GL15NA
2 lb. 9 oz.
Calculation: X oz. = 1.08/5 oz./ft. × (Refrigerant piping length (ft.) - 25)
OBH733G

24
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
MUZ-GL18NA
MUZ-GL18NAH
MUY-GL18NA
3 lb. 9 oz. 0 1.08 3.24 5.40 7.56 9.72 11.88 14.04 16.20
Calculation: X oz. = 1.08/5 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-GL24NA
MUZ-GL24NAH
MUY-GL24NA
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)
DATA7
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
MUZ-GL09NA
MUZ-GL09NAH
MUY-GL09NA
71 11.0 7.6 0.52 10.3 7.1 0.57 9.7 6.6 0.61 9.0 6.2 0.65 8.3 5.7 0.67
67 10.4 8.6 0.49 9.7 8.0 0.54 9.0 7.4 0.59 8.4 6.9 0.62 7.7 6.3 0.65
63 9.8 9.4 0.47 9.1 8.7 0.52 8.5 8.1 0.56 7.7 7.3 0.60 7.0 6.7 0.62
MUZ-GL12NA
MUZ-GL12NAH
MUY-GL12NA
71 14.7 9.4 0.82 13.7 8.7 0.90 12.9 8.2 0.97 12.0 7.6 1.02 11.0 7.0 1.06
67 13.9 10.7 0.77 13.0 10.0 0.85 12.0 9.2 0.92 11.2 8.6 0.98 10.3 7.9 1.02
63 13.1 11.8 0.74 12.1 10.9 0.81 11.3 10.2 0.88 10.3 9.3 0.94 9.4 8.5 0.98
MUZ-GL15NA
MUZ-GL15NAH
MUY-GL15NA
71 17.2 9.7 0.96 16.0 9.1 1.05 15.1 8.5 1.13 14.0 7.9 1.19 12.9 7.3 1.24
67 16.2 11.4 0.91 15.1 10.6 1.00 14.0 9.8 1.08 13.0 9.1 1.14 12.0 8.4 1.20
63 15.3 12.7 0.86 14.1 11.8 0.96 13.2 11.0 1.03 12.0 10.0 1.10 10.9 9.1 1.14
MUZ-GL18NA
MUZ-GL18NAH
MUY-GL18NA
71 22.1 16.2 1.19 20.6 15.2 1.31 19.4 14.3 1.41 18.0 13.3 1.48 16.6 12.2 1.54
67 20.9 18.2 1.13 19.4 16.9 1.24 18.0 15.7 1.34 16.7 14.6 1.42 15.4 13.4 1.49
63 19.6 19.7 1.07 18.2 18.2 1.19 16.9 17.0 1.28 15.4 15.4 1.37 14.0 14.1 1.42
MUZ-GL24NA
MUZ-GL24NAH
MUY-GL24NA
71 27.6 17.0 1.60 25.8 15.9 1.76 24.2 14.9 1.89 22.5 13.9 1.99 20.7 12.8 2.07
67 26.1 19.6 1.51 24.3 18.2 1.67 22.5 16.9 1.80 20.9 15.7 1.91 19.2 14.4 2.00
63 24.5 21.7 1.44 22.7 20.1 1.59 21.2 18.7 1.72 19.2 17.0 1.84 17.6 15.5 1.91
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.
MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA
MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA
MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA
MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA
MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA
OBH733G

25
2) COOLING CAPACITY CORRECTIONS
Refrigerant piping length (one way: ft.)
25 (std.) 40 65 100
MUZ-GL09NA
MUZ-GL09NAH
MUY-GL09NA
MUZ-GL12NA
MUZ-GL12NAH
MUY-GL12NA
MUZ-GL15NA
MUZ-GL15NAH
MUY-GL15NA
1.0 0.988 0.967 -
MUZ-GL18NA
MUZ-GL18NAH
MUY-GL18NA
1.0 0.985 0.963 0.933
MUZ-GL24NA
MUZ-GL24NAH
MUY-GL24NA
1.0 0.983 0.956 0.921
3) HEATING CAPACITY CORRECTIONS
Refrigerant piping length (one way: ft.)
25 (std.) 40 65 100
MUZ-GL09NA
MUZ-GL09NAH
MUZ-GL12NA
MUZ-GL12NAH
MUZ-GL15NA
MUZ-GL15NAH
1.0 0.997 0.993 -
MUZ-GL18NA
MUZ-GL18NAH
MUZ-GL24NA
MUZ-GL24NAH
1.0 0.997 0.993 0.987
OBH733G