Mitsubishi Electric MUZ-GS30NA User manual

Models
MUZ-GS30NA -U1 MUZ-GS30NAH -U1
MUZ-GS36NA -U1 MUZ-GS36NAH -U1
MUY-GS30NA -U1
MUY-GS36NA -U1
PARTS CATALOG (OBB875)
CONTENTS
1. TECHNICAL CHANGES ······························2
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 ······························· 20
11. DISASSEMBLY INSTRUCTIONS················· 40
HFC
utilized
R410A
OUTDOOR UNIT
SERVICE MANUAL
No. OBH875
REVISED EDITION-A
Indoor unit service manual
MSZ-GS•NA, MSY-GS•NA Series (OBH874)
OBH875 is void.
Revision A:
• A warning when opening or closing the
valve has been added.

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.
MUZ-GS30NA MUZ-GS30NAH
MUZ-GS36NA MUZ-GS36NAH
MUY-GS30NA
MUY-GS36NA
1. New model
Revision A:
• 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.
OBH875A

3
MUZ-GS30NA MUZ-GS30NAH MUZ-GS36NA MUZ-GS36NAH MUY-GS30NA MUY-GS36NA
PART NAMES AND FUNCTIONS
2
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
(back and side)
OBH875A

4
3SPECIFICATION
Outdoor unit model
MUZ-GS30NA
MUZ-GS30NAH
MUY-GS30NA
MUZ-GS36NA
MUZ-GS36NAH
MUY-GS36NA
Capacity
Rated (Minimum~Maximum)
Cooling *1 Btu/h 30,700
(10,300 ~ 30,700)
32,000/33,200
(10,300 ~ 32,000)/(10,300 ~ 33,200)
Heating 47 *1,3 Btu/h 32,600
(9,800 ~ 34,000)
35,200
(9,800 ~ 36,000)
Capacity
Rated (Maximum) Heating 17 *2,3 Btu/h 20,000 (20,800) 21,600 (22,800)
Power consumption
Rated (Minimum~Maximum)
Cooling *1 W3,320
(650 ~ 3,320)
3,630/3,770
(650 ~ 3,630)/(650 ~ 3,770)
Heating 47 *1,3 W3,340
(590 ~ 3,580)
3,740
(590 ~ 4,000)
Power consumption
Rated (Maximum) Heating 17 *2,3 W 2,500 (2,600) 2,770 (2,920)
EER *1 [SEER] *4 Cooling 9.2 [18.1] 8.8 [16.2]
HSPF IV *5 Heating *3 NA: 9.6 NA: 10
NAH: 9.4 NAH: 9.8
COP Heating *1,3 2.86 2.76
Power supply V , phase , Hz 208/230, 1 , 60
Max. fuse size (time delay) A 20
Min. circuit ampacity A 19
Fan motor F.L.A A 0.93
Compressor
Model SNB220FQAM1T
R.L.A A 13.8
L.R.A A 17.3
Refrigeration oil  oz. (L)/(Model) 15.6 (0.46)/(FV50S)
Refrigerant control Linear expansion valve
Sound level *1Cooling dB(A) 55 56
Heating *3 dB(A) 57
Defrost method Reverse cycle
Dimensions
W in. 33-1/16
D in. 13
H in. 34-5/8
Weight Ib. NA: 121
NAH: 122
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)
Gas in. 5/8 (0.0394)
Connection meth-
od
Indoor Flared
Outdoor Flared
Between the indoor
& outdoor units
Height di󰀨erence ft. 50
Piping length ft. 100
Refrigerant charge (R410A) 4 lb.
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
*3: Only MUZ
OBH875A

5
Test condition
AHRI
210/240
Mode Test Indoor air condition (°F) Outdoor air condition (°F)
Dry bulb Wet bulb Dry bulb Wet bulb
SEER
(Cooling)
"A-Full" Cooling Steady State
at rated compressor speed 80 67 95 (75)
"B-Full" Cooling Steady State
at rated compressor speed 80 67 82 (65)
"B-Low" Cooling Steady State
at minimum compressor speed 80 67 82 (65)
"F-Low" Cooling Steady State
at minimum compressor speed 80 67 67 (53.5)
"E-Int" Cooling Steady State
at intermediate compressor speed *6 80 67 87 (69)
HSPF
(Heating)
"H1-Nom" Heating Steady State
at rated compressor speed 70 60 47 43
"H3-Full" Heating
at rated compressor speed 70 60 17 15
"H0-Low" Heating Steady State
at minimum compressor speed 70 60 62 56.5
"H1-Low" Heating Steady State
at minimum compressor speed 70 60 47 43
"H2-Int" Heating
at intermediate compressor speed *6 70 60 35 33
*6: At intermediate compressor speed
= ("Rated compressor speed" - "minimum compressor speed") / 3 + "minimum compressor speed".
*4, *5
(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 -4 -5
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
OBH875A

6
OUTLINES AND DIMENSIONS
4
MUZ-GS30NA MUZ-GS30NAH MUZ-GS36NA MUZ-GS36NAH MUY-GS30NA MUY-GS36NA
Unit: inch
13
2
16-7/16
1-9/16
13-3/4
14-5/8
15-3/8
11/16
OVAL HOLES 2×3/8× 13/16
→
AIR IN
↓
AIR IN
↓AIR OUT
BOLT PITCH FOR INSTALLATION
DRAIN HOLE ø1-21/32
13
34-5/8
17-25/32
5/16
6-7/8 19-11/16
33-1/16 3-3/16
HANDLE
3-29/32
6-1/2
43
35
7-11/16
19/32
GAS REFRIGERANT
PIPE JOINT
LIQUID
REFRIGERANT
PIPE JOINT
SERVICE PANEL
VALVE COVER
SERVICE PORT
4 in OR MORE.
BASICALLY OPEN 20 in OR MORE WITHOUT ANY OBSTRUCTION IN FRONT AND BOTH SIDES OF THE UNIT.
14 in OR MORE.
20 in OR MORE.
OPEN TWO SIDES OF RIGHT
OR REAR SIDE.
4 in OR MORE.
FLARED ø15.88 (5/8”)
FLARED ø6.35 (1/4”)
REQUIRED SPACE
OBH875A

7
5WIRING DIAGRAM
MUZ-GS30NA MUZ-GS36NA
MUZ-GS30NAH MUZ-GS36NAH
OBH875A

8
MUY-GS30NA MUY-GS36NA
OBH875A

9
6REFRIGERANT SYSTEM DIAGRAM
MUZ-GS30NA MUZ-GS30NAH MUZ-GS36NA MUZ-GS36NAH MUY-GS30NA MUY-GS36NA
Outdoor
heat
exchanger
Flared connection
(Only GS30/36NAH)
Defrost
thermistor
RT61
Discharge
temperature
thermistor
RT62
Flared connection
Stop valve
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
4-way valve
Refrigerant flow in heating (Only MUZ)
Refrigerant pipe
ø 5/8
(with heat insulator)
Refrigerant pipe ø 1/4
(with heat insulator)
LEV
(Only MUZ)
R.V. coil
heating ON
cooling OFF
Muffler
Strainer
#100
Outdoor heat
exchanger
temperature
thermistor
RT68
Ambient
temperature
thermistor
RT65
Strainer
#100
Service port
(low pressure)
ACC
Service port
(high pressure)
Capillary tube
O.D. 0.157 ×
I.D. 0.094× 3-15/16
(ø4.0×ø2.4×100)
Strainer
#100
Unit: inch (mm)
OBH875A

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-GS30NA
MUZ-GS30NAH
MUZ-GS36NA
MUZ-GS36NAH
MUY-GS30NA
MUY-GS36NA
100 50 5/8 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 70 80 90 100
MUZ-GS30NA
MUZ-GS30NAH
MUZ-GS36NA
MUZ-GS36NAH
MUY-GS30NA
MUY-GS36NA
4 lb. 0 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)
OBH875A

11
MUZ-GS30NA MUZ-GS30NAH MUZ-GS36NA MUZ-GS36NAH MUY-GS30NA MUY-GS36NA
7-1. PERFORMANCE DATA
1) COOLING CAPACITY
Model
Indoor air Outdoor intake air DB temperature (˚F)
IWB (˚F) 75 85 95
TC SHC SHF TPC TC SHC SHF TPC TC SHC SHF TPC
MUZ-GS30NA
MUZ-GS30NAH
MUY-GS30NA
71 37.6 22.1 0.59 2.95 35.2 20.6 0.59 3.24 33.0 19.4 0.59 3.49
67 35.6 25.6 0.72 2.79 33.2 23.9 0.72 3.07 30.7 22.1 0.72 3.32
63 33.5 28.6 0.85 2.66 31.0 26.5 0.85 2.94 28.9 24.6 0.85 3.17
MUZ-GS36NA
MUZ-GS36NAH
MUY-GS36NA
(208V)
71 39.2 21.8 0.56 3.23 36.6 20.4 0.56 3.54 34.4 19.1 0.56 3.81
67 37.1 25.6 0.69 3.05 34.6 23.8 0.69 3.36 32.0 22.1 0.69 3.63
63 34.9 28.7 0.82 2.90 32.3 26.6 0.82 3.21 30.1 24.8 0.82 3.47
MUZ-GS36NA
MUZ-GS36NAH
MUY-GS36NA
(230V)
71 40.7 22.6 0.56 3.36 38.0 21.2 0.56 3.68 35.7 19.9 0.56 3.96
67 38.5 26.6 0.69 3.17 35.9 24.7 0.69 3.49 33.2 22.9 0.69 3.77
63 36.2 29.8 0.82 3.02 33.5 27.6 0.82 3.34 31.2 25.7 0.82 3.60
Model
Indoor air Outdoor intake air DB temperature (˚F)
IWB (˚F) 105 115
TC SHC SHF TPC TC SHC SHF TPC
MUZ-GS30NA
MUZ-GS30NAH
MUY-GS30NA
71 30.7 18.0 0.59 3.67 28.2 16.6 0.59 3.82
67 28.6 20.6 0.72 3.52 26.2 18.9 0.72 3.69
63 26.2 22.4 0.85 3.39 23.9 20.4 0.85 3.52
MUZ-GS36NA
MUZ-GS36NAH
MUY-GS36NA
(208V)
71 32.0 17.8 0.56 4.01 29.4 16.4 0.56 4.17
67 29.8 20.5 0.69 3.85 27.4 18.9 0.69 4.03
63 27.4 22.5 0.82 3.70 25.0 20.6 0.82 3.85
MUZ-GS36NA
MUZ-GS36NAH
MUY-GS36NA
(230V)
71 33.2 18.5 0.56 4.17 30.5 17.0 0.56 4.34
67 30.9 21.3 0.69 4.00 28.4 19.6 0.69 4.18
63 28.4 23.4 0.82 3.85 25.9 21.3 0.82 4.00
NOTE:1. IWB : Intake air wet-bulb temperature TC : Total Capacity (x103Btu/h)
SHC : Sensible Heat Capacity (x103Btu/h) SHF : Sensible Heat Factor
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
MUZ-GS30NA
MUZ-GS30NAH
MUY-GS30NA
1.0 0.976 0.937 0.887
MUZ-GS36NA
MUZ-GS36NAH
MUY-GS36NA
1.0 0.974 0.932 0.878
3) HEATING CAPACITY CORRECTIONS
Refrigerant piping length (one way: ft.)
25 (std.) 40 65 100
MUZ-GS30NA
MUZ-GS30NAH
MUZ-GS36NA
MUZ-GS36NAH
1.0 0.997 0.993 0.987
DATA7
OBH875A

12
4) HEATING CAPACITY
Model
Indoor air Outdoor intake air WB temperature (˚F)
IDB (˚F) 5 15 25 35 43 45 55
TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC
MUZ-GS30NA
75 14.3 1.97 18.9 2.49 23.6 2.92 28.2 3.26 31.8 3.42 32.8 3.47 37.2 3.61
70 15.5 1.89 20.0 2.40 24.5 2.86 28.9 3.17 32.6 3.34 33.6 3.41 38.0 3.54
65 16.3 1.80 20.5 2.30 25.6 2.76 29.8 3.09 33.6 3.26 34.6 3.31 38.8 3.47
MUZ-GS30NAH
75 14.3 2.09 18.9 2.61 23.6 3.04 28.2 3.26 31.8 3.42 32.8 3.47 37.2 3.61
70 15.5 2.01 20.0 2.52 24.5 2.98 28.9 3.17 32.6 3.34 33.6 3.41 38.0 3.54
65 16.3 1.92 20.5 2.42 25.6 2.88 29.8 3.09 33.6 3.26 34.6 3.31 38.8 3.47
MUZ-GS36NA
75 15.5 2.21 20.4 2.79 25.5 3.27 30.4 3.65 34.3 3.83 35.4 3.89 40.1 4.04
70 16.7 2.11 21.6 2.69 26.4 3.20 31.2 3.55 35.2 3.74 36.3 3.81 41.0 3.96
65 17.6 2.02 22.2 2.58 27.6 3.09 32.2 3.46 36.3 3.65 37.3 3.70 41.9 3.89
MUZ-GS36NAH
75 15.5 2.33 20.4 2.91 25.5 3.39 30.4 3.65 34.3 3.83 35.4 3.89 40.1 4.04
70 16.7 2.23 21.6 2.81 26.4 3.32 31.2 3.55 35.2 3.74 36.3 3.81 41.0 3.96
65 17.6 2.14 22.2 2.70 27.6 3.21 32.2 3.46 36.3 3.65 37.3 3.70 41.9 3.89
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.
7-2. PERFORMANCE CURVE
Cooling
MUZ-GS30NA MUZ-GS30NAH MUY-GS30NA
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
79
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
0.2
1.2
2.2
3.2
4.2
Indoor intake air WB temperature (°F)
SHF at rating condition = 0.72
= 823 CFM
Airflow
Outdoor intake air DB temperature (°F)
Total power consumption
(kW)
MUZ-GS36NA MUZ-GS36NAH MUY-GS36NA (208V)
71
67
63
65 75 85 95 105 115
0.2
1.2
2.2
3.2
4.2
5.2
Indoor intake air WB temperature (°F)
SHF at rating condition = 0.69
= 823 CFM
Airflow
Outdoor intake air DB temperature (°F)
Total power consumption
(kW)
OBH875A

13
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.
Heating
MUZ-GS30NA
Indoor air Dry-bulb temperature
difference (°F)
Outdoor intake air WB temperature (°F)
-4 5 14 23 32 41 50 59
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
Heating capacity
( at Rated frequency)
Capacity correction factor
59
68
79
Indoor intake air Dry-bulb temperature ( F)
65
70
75
-5 5 15 25 35 45 55 65
0.2
1.2
2.2
3.2
4.2
Indoor intake air DB temperature (°F)
= 803 CFM
Airflow
Outdoor intake air WB temperature (°F)
Total power consumption
(kW)
MUZ-GS30NAH
65
70
75
-5 5 15 25 35 45 55 65
0.3
1.3
2.3
3.3
4.3
Indoor intake air DB temperature (°F)
= 803 CFM
Airflow
Outdoor intake air WB temperature (°F)
Total power consumption
(kW)
MUZ-GS36NA
65
70
75
-5 5 15 25 35 45 55 65
0.2
1.2
2.2
3.2
4.2
5.2
Indoor intake air DB temperature (°F)
= 803 CFM
Airflow
Outdoor intake air WB temperature (°F)
Total power consumption
(kW)
MUZ-GS36NAH
65
70
75
-5 5 15 25 35 45 55 65
0.3
1.3
2.3
3.3
4.3
Indoor intake air DB temperature (°F)
= 803 CFM
Airflow
Outdoor intake air WB temperature (°F)
Total power consumption
(kW)
MUZ-GS36NA MUZ-GS36NAH MUY-GS36NA (230V)
71
67
63
65 75 85 95 105 115
0.2
1.2
2.2
3.2
4.2
5.2
Indoor intake air WB temperature (°F)
SHF at rating condition = 0.69
= 823 CFM
Airflow
Outdoor intake air DB temperature (°F)
Total power consumption
(kW)
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.
OBH875A

14
7-3. CONDENSING PRESSURE
Cooling
Data are based on the condition of indoor humidity 50 %.
Air flow should be set to High speed.
MUZ-GS36NA MUZ-GS36NAH MUY-GS36NA
65 70 75 80 85 90 95 100 105 110 115
200
240
280
320
360
400
440
480
520
560
600
(°F) (°F)
65 70 75 80 85 90 95 100 105 110 115
80
100
120
140
160
(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
MUZ-GS30NA MUZ-GS30NAH MUY-GS30NA
65 70 75 80 85 90 95 100 105 110 115
200
240
280
320
360
400
440
480
520
560
600
(°F) (°F)
65 70 75 80 85 90 95 100 105 110 115
80
100
120
140
160
(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
OBH875A

15
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.
MUZ-GS30NA MUZ-GS30NAH
75
70
65 75
70
65
(PSIG)
Condensing pressure
Outdoor ambient temperature
(°F) (°F)
(PSIG)
Suction pressure
Outdoor ambient temperature
5 15 25 35 45 55 65 75
200
240
280
320
360
400
440
480
520
560
600
Indoor DB temperature (°F)
5 15 25 35 45 55 65 75
20
60
100
140
180
220
Indoor DB temperature (°F)
MUZ-GS36NA MUZ-GS36NAH
75
70
65
75
70
65
(PSIG)
Condensing pressure
Outdoor ambient temperature
(°F) (°F)
(PSIG)
Suction pressure
Outdoor ambient temperature
5 15 25 35 45 55 65 75
200
240
280
320
360
400
440
480
520
560
600
Indoor DB temperature (°F)
5 15 25 35 45 55 65 75
20
60
100
140
180
220
Indoor DB temperature (°F)
OBH875A

16
7-4. STANDARD OPERATION DATA
Model MSZ-GS30NA
MSY-GS30NA
MSZ-GS36NA
MSY-GS36NA
Item Unit Cooling Heating Cooling Heating
Total
Capacity Btu/h 30,700 32,600 32,000/33,200 35,200
SHF — 0.72 — 0.69 —
Input kW 3.32 3.34 3.63/3.77 3.74
Rated frequency Hz 78 82 92 89
Electrical circuit
Indoor unit MSZ-GS30NA
MSY-GS30NA
MSZ-GS36NA
MSY-GS36NA
Power supply
V,
phase,
Hz
208/230,
1,
60
Input kW Cooling: 0.078
Heating: 0.055
Fan motor current A Cooling: 0.70/0.63
Heating: 0.52/0.47
Outdoor unit
MUZ-GS30NA
MUZ-GS30NAH
MUY-GS30NA
MUZ-GS36NA
MUZ-GS36NAH
MUY-GS36NA
Power supply
V,
phase,
Hz
208/230,
1,
60
Input kW 3.242 3.285 3.552/3.692 3.685
Comp. current A 12.61/11.41 13.25/11.98 14.42/15.18 15.68/14.18
Fan motor current A 0.84/0.76 0.83/0.75 0.98/0.89 0.83/0.75
Refrigerant circuit
Condensing
pressure PSIG 423 430 426 452
Suction
pressure PSIG 125 97 114 95
Discharge
temperature ˚F 175 180 182 185
Condensing
temperature ˚F 121 122 121 126
Suction
temperature ˚F 49 30 44 29
Comp. shell bottom
temperature ˚F 164 169 170 172
Ref. pipe length ft. 25
Refrigerant charge (R410A) 4 lb.
Indoor unit
Intake air
temperature
DB ˚F 80 70 80 70
WB ˚F 67 60 67 60
Discharge air
temperature
DB ˚F 54 116 53 119
WB ˚F 53 — 52 —
Fan speed (High) rpm 1,230 1,100 1,230 1,100
Airow (High) CFM 823 (Wet) 803 823 (Wet) 803
Outdoor unit
Intake air
temperature
DB ˚F 95 47 95 47
WB ˚F — 43 — 43
Fan speed rpm 810 800 900 800
Airow CFM 1,974 1,950 2,191 1,950
OBH875A

17
7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY
7-6. HOW TO OPERATE FIXED-FREQUENCY OPERATION (Test run operation)
1. Press the 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.
4. Indoor fan operates at High speed.
5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts (operation frequency of compressor var-
ies).
6. To cancel test run operation (EMERGENCY OPERATION), press the emergency operation switch or any button on remote
controller.
MUZ-GS30NA MUZ-GS30NAH MUY-GS30NA
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 25 50 75 100
0.0
0.5
1.0
1.5
2.0
0 25 50 75 100
0.0
0.5
1.0
1.5
2.0
0 25 50 75 100
0.0
0.5
1.0
1.5
2.0
0 25 50 75 100
0.0
0.5
1.0
1.5
2.0
MUZ-GS36NA MUZ-GS36NAH MUY-GS36NA (208V)
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 25 50 75 100
0.0
0.5
1.0
1.5
2.0
0 25 50 75 100
0.0
0.5
1.0
1.5
2.0
0 25 50 75 100
0.0
0.5
1.0
1.5
2.0
0 25 50 75 100
0.0
0.5
1.0
1.5
2.0
MUZ-GS36NA MUZ-GS36NAH MUY-GS36NA (230V)
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 25 50 75 100
0.0
0.5
1.0
1.5
2.0
0 25 50 75 100
0.0
0.5
1.0
1.5
2.0
0 25 50 75 100
0.0
0.5
1.0
1.5
2.0
0 25 50 75 100
0.0
0.5
1.0
1.5
2.0
OBH875A

18
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 ○○○
* MUZ-GS•NAH only.
ON
OFF
Compressor
Outdoor fan
motor
R.V.coil ON
OFF
ON
OFF
<COOL>
5 seconds
<HEAT>
5 seconds
MUZ-GS30NA MUZ-GS30NAH MUZ-GS36NA MUZ-GS36NAH MUY-GS30NA MUY-GS36NA
OBH875A

19
SERVICE FUNCTIONS
9
9-1. CHANGE IN DEFROST SETTING
Changing defrost finish temperature
<JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board (Refer to 10-6.1.).
Jumper
Defrost nish temperature
MUZ-GS30/36NA
MUZ-GS30/36NAH
MUY-GS30/36NA
JS
Soldered
(Initial setting) 50°F (10°C)
None
(Cut) 64°F (18°C)
9-2. PRE-HEAT CONTROL SETTING
Prolonged low load operation, in which the thermostat is OFF for a long time, at low outside temperature [32°F (0°C) or
less] may cause the following troubles. To prevent those troubles, activate the pre-heat control.
1) If moisture gets into the refrigerant cycle and freezes, it may interfer the start-up of the compressor.
2) If liquid refrigerant collects in the compressor, a failure in the compressor may occur.
The pre-heat control turns ON when the compressor temperature is 68°F (20°C) or below. When the pre-heat control
turns ON, the compressor is energized. (About 70 W)
Pre-heat control setting
<JK>
ON: To activate the pre-heat control, cut JK wire of the inverter P.C. board.
OFF: To deactivate the pre-heat control, solder JK wire of the inverter P.C. board.
(Refer to 10-6.1)
Jumper
Pre-heat control setting
MUZ-GS30/36NA
MUZ-GS30/36NAH
MUY-GS30/36NA
JK
Soldered Deactivated
(Initial setting)
Cut Activated
NOTE: When the inverter P.C. board is replaced, check the jumper wires, and cut/solder them if necessary.
MUZ-GS30NA MUZ-GS30NAH MUZ-GS36NA MUZ-GS36NAH MUY-GS30NA MUY-GS36NA
OBH875A

20
10 TROUBLESHOOTING
10-1. CAUTIONS ON TROUBLESHOOTING
1. Before troubleshooting, check the following
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for miswiring.
2. Take care of the following during servicing
1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, then after con-
firming the horizontal vane is closed, turn off the breaker and/or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic
control P.C. board.
3) When removing the electrical parts, be careful of the residual voltage of smoothing capacitor.
4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the
components.
5) When connecting or disconnecting the connectors, hold the connector housing. DO NOT pull the lead wires.
3. Troubleshooting procedure
1)
Check if the OPERATION INDICATOR lamp on the indoor unit is blinking on and off to indicate an abnormality. To make
sure, check how many times the OPERATION INDICATOR lamp is blinking on and off before starting service work.
2) Before servicing, verify that all connectors and terminals are connected properly.
3) When the electronic control P.C. board seems to be defective, check for disconnection of the copper foil pattern and
burnt or discolored components.
4) Refer to 10-2 and 10-3.
Lead wiring
<Incorrect>
Connector housing
<Correct>
MUZ-GS30NA MUZ-GS30NAH MUZ-GS36NA MUZ-GS36NAH MUY-GS30NA MUY-GS36NA
OBH875A