Mitsubishi Electric MUZ-WR09NA User manual

Models
MUZ-WR09NA -U1 , U2
MUZ-WR12NA -U1 , U2
MUZ-WR18NA -U1 , U2
MUZ-WR24NA -U1
HFC
utilized
R410A
MUZ-WR24NA
PARTS CATALOG (OBB819)
SERVICE MANUAL
No. OBH819
REVISED EDITION-B
Indoor unit service manual
MSZ-WR•NA Series (OBH818)
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 ··········· 12
7. DATA······················································ 15
8. ACTUATOR CONTROL ····························· 25
9. SERVICE FUNCTIONS······························ 26
10. TROUBLESHOOTING ······························· 27
11. DISASSEMBLY INSTRUCTIONS················· 52
OUTDOOR UNIT
OBH819 REVISED EDITION-A is void.
Revision B:
• MUZ-WR09/12/18NA- U2 have been added.
• 10-4. The resistant value of the defrost
heater has been corrected.

2
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.
1TECHNICAL CHANGES
MUZ-WR09NA - U1
MUZ-WR12NA - U1
MUZ-WR18NA - U1
MUZ-WR24NA - U1
1. New model
MUZ-WR09NA - U1 MUZ-WR09NA - U2
MUZ-WR12NA - U1 MUZ-WR12NA - U2
1. Fan motor has been changed.
2. Inverter P.C. board has been changed.
3. R.V. coil has been changed.
4. LEV has been changed.
5. Outdoor heat exchanger has been changed.
6. 4-way valve has been changed.
7. Compressor has been changed.
MUZ-WR18NA - U1 MUZ-WR18NA - U2
1. Fan motor has been changed.
2. Inverter P.C. board has been changed.
3. LEV has been changed.
Revision B:
• MUZ-WR09/12/18NA- U2 have been added.
OBH819B

3
MUZ-WR24NA
Piping
Air outlet
Drain outlet
Air inlet
(back and side)
Drain hose
PART NAMES AND FUNCTIONS
2
MUZ-WR09NA MUZ-WR12NA MUZ-WR18NA
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
(back and side)
OBH819B

4
3SPECIFICATION
Outdoor unit model MUZ-WR09NA
-U1
MUZ-WR09NA
-U2
MUZ-WR12NA
-U1
MUZ-WR12NA
- U2
Capacity
Rated (Minimum~Maximum)
Cooling 1 Btu/h 9,000 ( 3,800 - 10,000 ) 12,000 ( 3,800 - 12,200 )
Heating 47 1 Btu/h 10,900 ( 4,500 - 11,800 ) 12,200 ( 4,500 - 14,500 )
Capacity
Rated (Maximum) Heating 17 2 Btu/h 6,700 (7,200) 7,600 (9,000)
Power consumption
Rated (Minimum~Maximum)
Cooling 1 W 820 (240 - 930) 1,330 (240 - 1,400)
Heating 47 1 W 980 (240 - 1,090) 1,090 (240 - 1,340)
Power consumption
Rated (Maximum) Heating 17 2 W 760 (850) 880 (1,090)
EER 1 [SEER] 3Cooling 11.0 [ 16.0 ] 9.0 [ 16.0 ]
HSPF IV 4Heating 8.5
COP Heating 13.25 3.28
Power factor Cooling (208/230) % 87/87 95/95
Heating (208/230) % 90/90 93/93
Power supply V , phase , Hz 208/230 , 1 , 60
Max. fuse size (time delay) A 15
Min. circuit ampacity A 9
Fan motor F.L.A A 0.50
Compressor
Model KNB073FRVMC KNB073FRXMC KNB073FRVMC KNB073FRXMC
R.L.A A 6.2
L.R.A A 7.7
Refrigeration oil
 oz. (L) (Model) 9.1 (0.27) (FV50S)
Refrigerant control Linear expansion valve
Sound level 1Cooling dB(A) 48 51
Heating dB(A) 50 51
Airow
High - Med. - Low
Cooling CFM 1,063 - 1,063 - 1,063
Heating CFM 1,282 - 1,105 - 1,105
Fan speed
High - Med. - Low
Cooling rpm 740 - 740 - 740
Heating rpm 890 - 770- 770
Defrost method Reverse cycle
Dimensions
W in. 31-1/2
D in. 11-1/4
H in. 21-5/8
Weight Ib. 73
External nish Munsell 3Y 7.8/1.1
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 difference ft. 40
Piping length ft. 65
Refrigerant charge (R410A) 1 lb. 12 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
3: Test condition (Refer to 3-1.)
4: Test condition (Refer to 3-1.)
OBH819B

5
Outdoor unit model MUZ-WR18NA MUZ-WR24NA
Capacity
Rated (Minimum~Maximum)
Cooling 1 Btu/h 17,200 (5,800 - 18,000) 22,500 (5,800 - 22,500)
Heating 47 1 Btu/h 18,000 (5,400 - 20,900) 26,000 (5,400 - 26,000)
Capacity
Rated (Maximum) Heating 17 2 Btu/h 11,500 (15,000) 18,500 (18,500)
Power consumption
Rated (Minimum~Maximum)
Cooling 1 W 1,720 (350 - 2,170) 2,810 (330 - 2,810)
Heating 47 1 W 1,670 (330 - 2,360) 2,680 (320 - 2,680)
Power consumption
Rated (Maximum) Heating 17 2 W 1,360 (2,040) 2,460 (2,460)
EER 1 [SEER] 3Cooling 10.0 [16.0] 8.0 [16.0]
HSPF IV 4Heating 8.5 8.5
COP Heating 13.16 2.84
Power factor Cooling (208/230) % 98/98 99/99
Heating (208/230) % 97/97 99/99
Power supply V , phase , Hz 208/230, 1, 60
Max. fuse size (time delay) A 15
Min. circuit ampacity A 10 14
Fan motor F.L.A A 0.50 0.93
Compressor
Model SNB130FQBMT
R.L.A A 7.4 10
L.R.A A 9.3 12.5
Refrigeration oil
 oz. (L) (Model) 11.8 (0.35) (FV50S)
Refrigerant control Linear expansion valve
Sound level 1Cooling dB(A) 53 57
Heating dB(A) 51 55
Airow
High - Med. - Low
Cooling CFM 1,102 - 1,102 - 639 1,742 - 1,742 - 922
Heating CFM 1,186 - 1,045 - 1,045 1,691 - 1,691 - 1,372
Fan speed
High - Med. - Low
Cooling rpm 810 - 810 - 490 840 - 840 - 450
Heating rpm 870 - 770 - 770 810 - 810 - 650
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. 81 121
External nish Munsell 3Y 7.8/1.1 Munsell 3Y 7.8/1.1
Refrigerant piping Not supplied Not supplied
Refrigerant pipe size
(Min. wall thickness)
Liquid in. 1/4 (0.0315) 3/8 (0.0315)
Gas in. 1/2 (0.0315) 5/8 (0.0315)
Connection method 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. 9 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
3: Test condition (Refer to 3-1.)
4: Test condition (Refer to 3-1.)
OBH819B

6
3-1. 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 32 —
Maximum humidity 78 % —
Heating
Standard temperature 70 60 47 43
Maximum temperature 80 67 75 65
Minimum temperature 70 60 5 4
3-2. 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
OBH819B

7
OUTLINES AND DIMENSIONS
4
Unit: inch
MUZ-WR09NA MUZ-WR12NA MUZ-WR18NA
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
Liquid refrigerant pipe joint
Refrigerant pipe (flared) Ø 1/4
Gas refrigerant pipe joint
Refrigerant pipe (flared) Ø 3/8 (WR09/12)
Ø
1/2 (WR18)
REQUIRED SPACE
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
holes
OBH819B

8
MUZ-WR24NA 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 3/8
Gas refrigerant pipe joint
Refrigerant pipe (flared) Ø 5/8
*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
OBH819B

9
5WIRING DIAGRAM
MUZ-WR09NA-U2 MUZ-WR12NA-U2
MUZ-WR09NA-U1 MUZ-WR12NA-U1
OBH819B

10
MUZ-WR18NA-U1
MUZ-WR18NA-U2
OBH819B

11
MUZ-WR24NA
OBH819B

12
6REFRIGERANT SYSTEM DIAGRAM
Unit: Inch (mm)
Flared connection
Discharge
temperature
thermistor
RT62
Flared connection
Stop valve
(with strainer)
Stop valve
(with service port)
Compressor
4-way valve
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
Muffler
Capillary tube
O.D. 0.118 × I.D. 0.055
× 10-1/4
(ø3.0 × ø1.4
× 260)
Muffler
Service port
Service port
Outdoor
heat
exchanger
Defrost
thermistor
RT61
Ambient
temperature
thermistor
RT65
Outdoor heat
exchanger
temperature
thermistor
RT68
Refrigerant flow in cooling
Refrigerant flow in Heating
MUZ-WR09NA MUZ-WR12NA
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT61
Discharge
temperature
thermistor
RT62
Flared connection
Stop valve
(with strainer)
Compressor
4-way valve
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
Refrigerant pipe ø1/2 (ø12.7)
(with heat insulator)
Stop valve
(with service port)
Muffler
Refrigerant flow in cooling
Refrigerant flow in Heating
MUZ-WR18NA
OBH819B

13
Unit: Inch (mm)
MUZ-WR24NA
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
(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
Refrigerant pipe
ø5/8 ( ø 15.88)
(with heat insulator)
Refrigerant pipe ø3/8 ( ø 9.52)
(with heat insulator)
LEV
R.V. coil
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
Ambient
temperature
thermistor
RT65
OBH819B

14
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-WR09NA
MUZ-WR12NA
65 40
3/8
1/4
MUZ-WR18NA 1/2
MUZ-WR24NA 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-WR09NA
MUZ-WR12NA 1 lb. 12 oz.
0 1.08 3.24 5.40 7.56 8.64
MUZ-WR18NA 2 lb. 10 oz.
Calculation: X oz. = 1.08/5 oz./ft. × (Refrigerant piping length (ft.) - 25)
Model Outdoor unit
precharged
Refrigerant piping length (one way): ft.
25 30 40 50 60 70 80 90 100
MUZ-WR24NA 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)
OBH819B

15
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-WR09NA
71 11.0 7.6 0.73 10.3 7.1 0.80 9.7 6.6 0.86 9.0 6.2 0.91 8.3 5.7 0.94
67 10.4 8.6 0.69 9.7 8.0 0.76 9.0 7.4 0.82 8.4 6.9 0.87 7.7 6.3 0.91
63 9.8 9.4 0.66 9.1 8.7 0.73 8.5 8.1 0.78 7.7 7.3 0.84 7.0 6.7 0.87
MUZ-WR12NA
71 14.7 9.4 1.18 13.7 8.7 1.30 12.9 8.2 1.40 12.0 7.6 1.47 11.0 7.0 1.53
67 13.9 10.7 1.12 13.0 10.0 1.23 12.0 9.2 1.33 11.2 8.6 1.41 10.3 7.9 1.48
63 13.1 11.8 1.06 12.1 10.9 1.18 11.3 10.2 1.27 10.3 9.3 1.36 9.4 8.5 1.41
MUZ-WR18NA
71 21.1 15.3 1.53 19.7 14.3 1.68 18.5 13.4 1.81 17.2 12.5 1.90 15.8 11.5 1.98
67 20.0 17.2 1.44 18.6 16.0 1.59 17.2 14.8 1.72 16.0 13.8 1.82 14.7 12.6 1.91
63 18.7 18.6 1.38 17.4 17.3 1.52 16.2 16.1 1.64 14.7 14.6 1.75 13.4 13.3 1.82
MUZ-WR24NA
71 27.6 20.0 2.50 25.8 18.7 2.74 24.2 17.6 2.95 22.5 16.4 3.11 20.7 15.0 3.23
67 26.1 22.4 2.36 24.3 20.9 2.60 22.5 19.4 2.81 20.9 18.0 2.98 19.2 16.5 3.12
63 24.5 24.4 2.25 22.7 22.6 2.49 21.2 21.0 2.68 19.2 19.1 2.87 17.6 17.4 2.98
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-WR09NA MUZ-WR12NA MUZ-WR18NA MUZ-WR24NA
2) COOLING CAPACITY CORRECTIONS
Model Refrigerant piping length (one way: ft.)
25 (std.) 40 65 100
MUZ-WR09NA
MUZ-WR12NA 1.0 0.988 0.967 —
MUZ-WR18NA 1.0 0.985 0.963 —
MUZ-WR24NA 1.0 0.983 0.956 0.921
OBH819B

16
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-WR09NA
75 4.8 0.58 6.3 0.73 7.9 0.86 9.4 0.96 10.6 1.00 11.0 1.02 12.4 1.06
70 5.2 0.55 6.7 0.71 8.2 0.84 9.6 0.93 10.9 0.98 11.2 1.00 12.7 1.04
65 5.5 0.53 6.9 0.68 8.6 0.81 10.0 0.91 11.2 0.96 11.6 0.97 13.0 1.02
MUZ-WR12NA
75 5.4 0.64 7.1 0.81 8.8 0.95 10.6 1.06 11.9 1.12 12.3 1.13 13.9 1.18
70 5.8 0.62 7.5 0.78 9.2 0.93 10.8 1.04 12.2 1.09 12.6 1.11 14.2 1.16
65 6.1 0.59 7.7 0.75 9.6 0.90 11.2 1.01 12.6 1.06 12.9 1.08 14.5 1.13
MUZ-WR18NA
75 7.9 0.99 10.4 1.24 13.1 1.46 15.6 1.63 17.6 1.71 18.1 1.74 20.5 1.80
70 8.6 0.94 11.1 1.20 13.5 1.43 15.9 1.59 18.0 1.67 18.5 1.70 21.0 1.77
65 9.0 0.90 11.3 1.15 14.1 1.38 16.5 1.54 18.5 1.63 19.1 1.65 21.4 1.74
MUZ-WR24NA
75 11.4 1.58 15.1 2.00 18.9 2.35 22.5 2.61 25.4 2.75 26.1 2.79 29.6 2.89
70 12.4 1.51 16.0 1.93 19.5 2.29 23.0 2.55 26.0 2.68 26.8 2.73 30.3 2.84
65 13.0 1.45 16.4 1.85 20.4 2.21 23.8 2.48 26.8 2.61 27.6 2.65 30.9 2.79
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 or press any button on the remote con-
troller.
3) HEATING CAPACITY CORRECTIONS
Model Refrigerant piping length (one way: ft.)
25 (std.) 40 65 100
MUZ-WR09NA
MUZ-WR12NA
MUZ-WR18NA
1.0 0.997 0.993 —
MUZ-WR24NA 1.0 0.997 0.993 0.987
OBH819B

17
7-2. PERFORMANCE CURVE
Cooling
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)
MUZ-WR09NA MUZ-WR12NA
MUZ-WR24NAMUZ-WR18NA
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
65 75 85 95 105 115
1.2
1.4
1.6
1.8
2.0
71
67
63
65 75 85 95 105 115
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Indoor intake air WB temperature (°F)
Indoor intake air WB temperature (°F)
SHF at rating condition = 0.82
= 399 CFM
Airflow
Outdoor intake air DB temperature (°F)
Total power consumption
(kW)
65 75 85 95 105 115
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
SHF at rating condition = 0.86
= 625 CFM
Airflow
Outdoor intake air DB temperature (°F)
Total power consumption
(kW)
71
67
63
65 75 85 95 105 115
0.9
1.0
1.1
1.2
1.3
1.4
1.5
Indoor intake air WB temperature (°F)
SHF at rating condition = 0.77
= 399 CFM
Airflow
Outdoor intake air DB temperature (°F)
Total power consumption
(kW)
71
67
63
SHF at rating condition = 0.89
= 702 CFM
Airflow
Outdoor intake air DB temperature (°F)
Total power consumption
(kW)
Indoor intake air WB temperature (°F)
OBH819B

18
Heating
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)
MUZ-WR24NA
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.
MUZ-WR09NA MUZ-WR12NA
MUZ-WR18NA
0 10 20 30 40 50 60 70
0.3
0.5
0.7
0.9
1.1
Indoor intake air DB temperature (°F)
= 406 CFM
Airflow
Outdoor intake air WB temperature (°F)
Total power consumption
(kW)
75
70
65
75
70
65
0 10 20 30 40 50 60 70
0.4
0.6
0.8
1.0
1.2
Indoor intake air DB temperature (°F)
= 406 CFM
Airflow
Outdoor intake air WB temperature (°F)
Total power consumption
(kW)
75
70
65
0 10 20 30 40 50 60 70
0.5
0.8
1.1
1.4
1.7
2.0
Indoor intake air DB temperature (°F)
= 625 CFM
Airflow
Outdoor intake air WB temperature (°F)
Total power consumption
(kW)
75
70
65
0 10 20 30 40 50 60 70
0.8
1.4
2.0
2.6
3.2
Indoor intake air DB temperature (°F)
= 702 CFM
Airflow
Outdoor intake air WB temperature (°F)
Total power consumption
(kW)
OBH819B

19
70 75 80 85 90 95 100 105
100
120
140
160
180
(PSIG)(PSIG)
70 75 80 85 90 95 100 105
280
335
390
445
500
Condensing pressure
445
Condensing pressure
445
86
80
75
70
Suction pressure
Outdoor ambient temperature
Indoor DB temperature (°F)
Indoor DB temperature (°F)
Indoor DB temperature (°F)
Indoor DB temperature (°F)
Indoor DB temperature (°F)
Indoor DB temperature (°F)
Indoor DB temperature (°F)
Indoor DB temperature (°F)
Indoor DB temperature (°F)
Indoor DB temperature (°F)
Outdoor ambient temperature
Indoor DB temperature (°F)
86
80
75
70
(PSIG)
70 75 80 85 90 95 100 105
280
320
360
400
440
Condensing pressure
86
80
75
70
Indoor DB temperature (°F)
120
140
160
180
200
(PSIG)
Suction pressure
Outdoor ambient temperature
Indoor DB temperature (°F)
86
80
75
70
70 75 80 85 90 95 100 105
7-3. CONDENSING PRESSURE
Cooling
Data is based on the condition of indoor humidity 50 %.
Air flow should be set to High speed.
MUZ-WR09NA
MUZ-WR12NA
OBH819B

20
Heating
Data is based on the condition of outdoor humidity 75%.
Air flow should be set to High speed.
Data is for heating operation without any frost.
MUZ-WR24NA
MUZ-WR18NA
80
100
120
140
160
180
200
Suction pressure
70 75 80 85 90 95 100 105
70 75 80 85 90 95 100 105
250
300
350
400
450
500
550
(°F) (°F)
(PSIG) (PSIG)
Condensing pressure
Indoor DB temperature (°F)
Outdoor ambient temperature Outdoor ambient temperature
86
80
75
70
86
80
75
70
Indoor DB temperature (°F)
70 75 80 85 90 95 100 105
270
310
350
390
430
470
510
(°F) (°F)
70 75 80 85 90 95 100 105
90
105
120
135
150
165
180
(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
OBH819B