Daikin FF-C User manual

TECHNICAL MANUAL
Split Unit Air Conditioner
Ceiling Cassette C & E Series
FF-C, FHC-E, FFY-C, FHYC-E
— Cooling only & Heatpump [50Hz] —
R22
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Table of Contents
Table of Contents
Nomenclature......................................................................................................................1
Indoor ............................................................................................................................1
Outdoor..........................................................................................................................1
Product Line-Up.............................................................................................................2
Application Information .....................................................................................................4
Operating Range ...........................................................................................................4
Refrigerant Circuit Diagrams (C Series) ........................................................................5
Refrigerant Circuit Diagrams (E Series) ........................................................................7
Installation Guideline ................................................................................................... 11
Sound Data........................................................................................................................16
Sound Pressure Level .................................................................................................16
NC Curve.....................................................................................................................17
Engineering & Physical Data...........................................................................................21
Performance Data.............................................................................................................26
Calculation Steps.........................................................................................................26
Performance Tables.....................................................................................................28
Outline & Dimension ........................................................................................................49
Wiring Diagram .................................................................................................................52
Service & Maintenance ....................................................................................................63
Troubleshooting ...............................................................................................................65
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Nomenclature
1
Nomenclature
Indoor
FF(Y) 10 C X V1
Power Supply
V1: 1 phase 50 Hz 220-240V
Production
X: OYLM
Product Series
C: C Series
E: E Series
Capacity
10: 10000 Btu/hr
Model
FF: Ceiling Cassette 2"x2" (Cooling Only)
FHC: Ceiling Cassette 3"x3" (Cooling Only)
FFY: Ceiling Cassette 2"x2" (Heatpump)
FHYC: Ceiling Cassette 3"x3" (Heatpump)
Outdoor
R(Y) 10 C X V1
Power Supply
V1: 1 phase 50 Hz 220-240V
Y1: 3 phase 50 Hz 380-415V
Production
X: OYLM
Product Series
C: C Series
D: D Series
Capacity
10: 10000 Btu/hr
Model
R: Single Split Condensing Unit (Cooling Only)
RY: Single Split Condensing Unit (Heatpump)
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Nomenclature
2
Product Line-Up
Indoor Unit
FF(Y)/FH(Y)C
Nomenclature
Classification
Panel (Handset) PCB Fin Refrigerant Control
BC20CXW (BRC52A62) BYC20CXW (BRC52A61) BC50EXW (BRC52A62) BYC50EXW (BRC52A61) L208A EC L208A AP L2CKE EC L2CKE AP Hydrophilic (Blue) Cap Tube w/o Cap Tube
COOLING
FF10CXV1 X X X X
FF15CXV1 X X X X
FF20CXV1 X X X X
FHC20EXV1 X X X X
FHC25EXV1 X X X X
FHC28EXV1 X X X X
FHC40EXV1 X X X X
FHC50EXV1 X X X X
HEATPUMP
FFY10CXV1 X X X X
FFY15CXV1 X X X X
FFY20CXV1 X X X X
FHYC20EXV1 X X X X
FHYC25EXV1 X X X X
FHYC28EXV1 X X X X
FHYC40EXV1 X X X X
FHYC50EXV1 X X X X
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Nomenclature
3
Outdoor Unit
R(Y)
Nomenclature
Classification
Refrigerant Control Fin Safety Devices Compressor Others
Cap Tube TXV w/o Cap Tube Hydrophilic (Blue) Hydrophilic (Gold) Bare Aluminium Contactor HP LP Rotary Scroll Drain Elbow
COOLING
R10CXV1 X X X
R10CGXV1 X X X
R15CXV1 X X X
R15CGXV1 X X X
R20CXV1 X X X
R20CGXV1 X X X
R25CXV1 X X X
R25CGXV1 X X X
R28CXV1 X X X
R28CGXV1 X X X
R35DXV1 X X X X X X
R35DGXV1 X X X X X X
R40DXV1 X X X X X X
R40DGXV1 X X X X X X
R40DXY1 X X X X X X
R40DGXY1 X X X X X X
R50DXY1 X X X X X X
R50DGXY1 X X X X X X
HEATPUMP
RY10CXV1 X X X X
RY10CGXV1 X X X X
RY15CXV1 X X X X
RY15CGXV1 X X X X
RY18CXV1 X X X X
RY18CGXV1 X X X X
RY20CXV1 X X X X
RY20CGXV1 X X X X
RY25CXV1 X X X X
RY25CGXV1 X X X X
RY28CXV1 X X X X
RY28CGXV1 X X X X
RY35DXV1 X X X X X X X
RY35DGXV1 X X X X X X X
RY40DXV1 X X X X X X
RY40DGXV1 X X X X X X
RY40DXY1 X X X X X X
RY40DGXY1 X X X X X X
RY50DXY1 X X X X X X
RY50DGXY1 X X X X X X
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4
Application Information
Application Information
Operating Range
Ensure the operating temperature is in allowance range.
Cooling
The use of your air conditioner
outside the range of working
temperature and humidity can
result in serious failure.
Outdoor
DB (°C)
46
43
19
14 19 23 Indoor WB (°C)
Heating
The use of your air conditioner
outside the range of working
temperature and humidity can
result in serious failure.
Outdoor
WB (°C)
18
15 20 27 Indoor DB (°C)
10
-9
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5
Application Information
Refrigerant Circuit Diagrams (C Series)
Model: FF10CXV1 – R10CXV1 / FF15CXV1 – R15CXV1 / FF20CXV1 – R20CXV1
COOLING OPERATION
3 WAY
VALVE
DISCHARGE
ACCUMULATOR
COMPRESSOR
RETURN
AIR SENSOR
HEAT EXCHANGER
(INDOOR UNIT)
PIPE TEMPERATURE
SENSOR
2 WAY
VALVE
COOLING
CAP TUBE
STRAINER
HEAT EXCHANGER
(OUTDOOR UNIT)
INDOOR UNIT OUTDOOR UNIT
Model: FFY10CXV1 – RY10CXV1 / FFY20CXV1 – RY18CXV1
COOLING OPERATION
HEATING OPERATION
OUTDOOR UNITINDOOR UNIT
PIPE TEMPERATURE
SENSOR
COOLING & HEATING
CAP TUBE
STRAINER STRAINER
HEAT EXCHANGER
(OUTDOOR UNIT)
RETURN
AIR SENSOR
HEAT EXCHANGER
(INDOOR UNIT)
PIPE TEMPERATURE
SENSOR
3 WAY
VALVE
PIPING
GAS
PIPING
LIQUID
2 WAY
VALVE
DISCHARGE
4 WAY VALVE
ACCUMULATOR
COMPRESSOR
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6
Application Information
Model: FFY15CXV1 – RY15CXV1 / FFY20CXV1 – RY20CXV1
COOLING OPERATION
HEATING OPERATION
OUTDOOR UNITINDOOR UNIT
PIPE TEMPERATURE
SENSOR
COOLING & HEATING
CAP TUBE
HEATING CAP
TUBE
STRAINER STRAINER
CHECK
VALVE
HEAT EXCHANGER
(OUTDOOR UNIT)
RETURN
AIR SENSOR
HEAT EXCHANGER
(INDOOR UNIT)
PIPE TEMPERATURE
SENSOR
3 WAY
VALVE
PIPING
GAS
PIPING
LIQUID
2 WAY
VALVE
DISCHARGE
4 WAY VALVE
ACCUMULATOR
COMPRESSOR
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7
Application Information
Refrigerant Circuit Diagrams (E Series)
Model: FHC20EXV1 – R20CXV1
STRAINER
COOLING OPERATION
3 WAY
VALVE
DISCHARGE
ACCUMULATOR
COMPRESSOR
RETURN
AIR SENSOR
HEAT EXCHANGER
(INDOOR UNIT)
PIPE TEMPERATURE
SENSOR
2 WAY
VALVE
COOLING
CAP TUBE
HEAT EXCHANGER
(OUTDOOR UNIT)
INDOOR UNIT OUTDOOR UNIT
Model: FHC25EXV1 – R25CXV1
STRAINER
COOLING OPERATION
3 WAY
VALVE
DISCHARGE
ACCUMULATOR
COMPRESSOR
RETURN
AIR SENSOR
HEAT EXCHANGER
(INDOOR UNIT)
PIPE TEMPERATURE
SENSOR
3 WAY
VALVE
COOLING
CAP TUBE
HEAT EXCHANGER
(OUTDOOR UNIT)
INDOOR UNIT OUTDOOR UNIT
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8
Application Information
Model: FHC28EXV1 – R28CXV1
STRAINER
COOLING OPERATION
3 WAY
VALVE
DISCHARGE
ACCUMULATOR
COMPRESSOR
RETURN
AIR SENSOR
HEAT EXCHANGER
(INDOOR UNIT)
PIPE TEMPERATURE
SENSOR
3 WAY
VALVE
COOLING
CAP TUBE
HEAT EXCHANGER
(OUTDOOR UNIT)
INDOOR UNIT OUTDOOR UNIT
Model: FHC40EXV1 – R35DXV1 / FHC40EXV1 – R40DXV1 / FHC40EXV1 – R40DXY1 /
FHC50EXV1 – R50DXY1
STRAINER
COOLING OPERATION
3 WAY
VALVE
DISCHARGE
LOW
PRESSURE
SWITCH
ACCUMULATOR
RETURN
AIR SENSOR
HEAT EXCHANGER
(INDOOR UNIT)
PIPE TEMPERATURE
SENSOR
3 WAY
VALVE
CAP TUBE
HEAT EXCHANGER
(OUTDOOR UNIT)
INDOOR UNIT OUTDOOR UNIT
COMPRESSOR
HIGH
PRESSURE
SWITCH
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9
Application Information
Model: FHYC20EXV1 – RY20CXV1
COOLING OPERATION
HEATING OPERATION
OUTDOOR UNITINDOOR UNIT
PIPE TEMPERATURE
SENSOR
COOLING & HEATING
CAP TUBE
HEATING CAP
TUBE
STRAINER STRAINER
CHECK
VALVE
HEAT EXCHANGER
(OUTDOOR UNIT)
RETURN
AIR SENSOR
HEAT EXCHANGER
(INDOOR UNIT)
PIPE TEMPERATURE
SENSOR
3 WAY
VALVE
PIPING
GAS
PIPING
LIQUID
2 WAY
VALVE
DISCHARGE
4 WAY VALVE
ACCUMULATOR
COMPRESSOR
Model: FHYC25EXV1 – RY25CXV1 / FHYC28EXV1 – RY28CXV1
COOLING OPERATION
HEATING OPERATION
OUTDOOR UNITINDOOR UNIT
PIPE TEMPERATURE
SENSOR
COOLING & HEATING
CAP TUBE
STRAINER STRAINER
HEAT EXCHANGER
(OUTDOOR UNIT)
RETURN
AIR SENSOR
HEAT EXCHANGER
(INDOOR UNIT)
PIPE TEMPERATURE
SENSOR
3 WAY
VALVE
PIPING
GAS
PIPING
LIQUID
3 WAY
VALVE
DISCHARGE
4 WAY VALVE
ACCUMULATOR
COMPRESSOR
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Application Information
Model: FHYC40EXV1 – RY35DXV1
COOLING OPERATION
HEATING OPERATION
OUTDOOR UNITINDOOR UNIT
PIPE TEMPERATURE
SENSOR
COOLING & HEATING
CAP TUBE
STRAINER
BIFLOW
TXV
STRAINER
HEAT EXCHANGER
(OUTDOOR UNIT)
RETURN
AIR SENSOR
HEAT EXCHANGER
(INDOOR UNIT)
PIPE TEMPERATURE
SENSOR
3 WAY
VALVE
PIPING
GAS
PIPING
LIQUID
3 WAY
VALVE
DISCHARGE
4 WAY VALVE
HIGH
PRESSURE
SWITCH
ACCUMULATOR
COMPRESSOR
Model: FHYC40EXV1 – RY40DXV1 / FHYC40EXV1 – RY40DXY1 / FHYC50EXV1 – RY50DXY1
COOLING OPERATION
HEATING OPERATION
OUTDOOR UNITINDOOR UNIT
PIPE TEMPERATURE
SENSOR
HEATING CAP. TUBE
ACCESS
VALVE
STRAINER
COOLING
CAP. TUBE
CHECK
VALVE
STRAINER
HEAT EXCHANGER
(OUTDOOR UNIT)
RETURN
AIR SENSOR
HEAT EXCHANGER
(INDOOR UNIT)
PIPE TEMPERATURE
SENSOR
3 WAY
VALVE
PIPING
GAS
PIPING
LIQUID
3 WAY
VALVE
DISCHARGE
4 WAY VALVE
HIGH
PRESSURE
SWITCH
ACCUMULATOR
COMPRESSOR
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11
Application Information
Installation Guideline
Safety Precautions
Installation and maintenance should be performed
by qualified persons who are familiar with local code
and regulation, and experienced with this type of
appliance.
All field wiring must be installed in accordance with
the national wiring regulation.
Ensure that the rated voltage of the unit corresponds
to that of the name plate before commencing wiring
work according to the wiring diagram.
The unit must be GROUNDED to prevent possible
hazard due to insulation failure.
All electrical wiring must not touch the refrigerant
piping or any moving parts of the fan motors.
Confirm that the unit has been switched OFF before
installing or servicing the unit.
Disconnect from the main power supply before
servicing the air conditioner unit.
DO NOT pull out the power cord when the power is
ON. This may cause serious electrical shocks which
may result in fire hazards.
Keep the indoor and outdoor units, power cable and
transmission wiring, at least 1m from TVs and radios,
to prevent distorted pictures and static. {Depending
on the type and source of the electrical waves, static
may be heard even when more than 1m away}.
•
•
•
•
•
•
•
•
•
Please take note of the following important points
when installing.
Do not install the unit where leakage of flammable
gas may occur.
If gas leaks and accumulates around the unit, it
may cause fire ignition.
Ensure that drainage piping is connected properly.
If the drainage piping is not connected properly,
it may cause water leakage which will dampen
the furniture.
Do not overcharge the unit.
This unit is factory pre-charged. Overcharge will
cause over-current or damage to the compressor.
Ensure that the unit’s panel is closed after service
or installation.
Unsecured panels will cause the unit to operate
noisily.
Sharp edges and coil surfaces are potential
locations which may cause injury hazards. Avoid
from being in contact with these places.
Before turning off the power supply, set the remote
controller’s ON/OFF switch to the “OFF” position
to prevent the nuisance tripping of the unit. If this is
not done, the unit’s fans will start turning automatically
when power resumes, posing a hazard to service
personnel or the user.
Do not operate any heating apparatus too close to the
air conditioner unit. This may cause the plastic panel to
melt or deform as a result of the excessive heat.
Ensure the color of wires of the outdoor unit and
the terminal markings are same to the indoors
respectively.
IMPORTANT : DO NOT INSTALL OR USE THE AIR
CONDITIONER UNIT IN A LAUNDRY ROOM.
Do not use joined and twisted wires for incoming
power supply.
•
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•
•
•
•
•
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NOTICE
Disposal requirements
Your air conditioning product is marked with this symbol. This means that electrical and electronic products
shall not be mixed with unsorted household waste.
Do not try to dismantle the system yourself: the dismantling of the air conditioning system, treatment of the
refrigerant, of oil and of other parts must be done by a qualified installer in accordance with relevant local and
national legislation. Air conditioners must be treated at a specialized treatment facility for re-use, recycling
and recovery. By ensuring this product is disposed of correctly, you will help to prevent potential negative
consequences for the environment and human health. Please contact the installer or local authority for more
information.
Batteries must be removed from the remote controller and disposed of separately in accordance with relevant
local and national legislation.
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12
Application Information
1) Indoor Installation Clearance
Clearance must be provided for the indoor unit from wall and obstacles as shown in figure below.
Beam
Max. 0.3 m
Min 0.5 m
Min 0.5 m
Max. 3.0 m
Min 0.5 m
Floor
Obstacles
The installation place (handling ceiling surface) must be level and the height in the ceiling is 350mm or more.
2) Outdoor Installation Clearance
Outdoor unit must be installed such that there is no short circuit of the hot discharge air or obstruction to smooth
air flow. Select the coolest possible place where intake air should not hotter than the outside temperature
(Max. 45°C).
ALL MODELS A B C D
Minimum Distance 300 mm 1000 mm 300 mm 500 mm
If the condensing unit is operated in an atmosphere containing oils (including machine
oils), salt (coastal area), sulphide gas (near hot spring, oil refinery plant), such substances
may lead to failure the unit.
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13
Application Information
3) Cable Size
Cooling only
Model Unit FF10/15CXV1 FF20CXV1 FHC20EXV1
R10/15CXV1 R20CXV1 R20CXV1
Power supply cable size
Number of wire mm² 1.5 3
2.5
3
2.5
3
Interconnection cable size
Number of wire mm² 1.5 3
2.5
3
2.5
3
Recommended fuse A 15 20 13
Model Unit FHC25EXV1 FHC28EXV1 FHC40EXV1
R25CXV1 R28CXV1 R35DXV1
Power supply cable size
Number of wire mm22.5 3
4.0
3
4.0
3
Interconnection cable size
Number of wire mm22.5 3
2.5
3
2.5
4
Recommended fuse A 18 25 25
Model Unit FHC40EXV1 FHC40EXV1 FHC50EXV1
R40DXV1 R40DXY1 R50DXY1
Power supply cable size
Number of wire mm24.0 3
2.5
5
2.5
5
Interconnection cable size
Number of wire mm22.5 4
1.5
4
1.5
4
Recommended fuse A 30 13 18
Heatpump
Model Unit FFY10/15CXV1 FFY20CXV1 FHYC20EXV1
RY10/15CXV1 RY18/20CXV1 RY20CXV1
Power supply cable size
Number of wire mm21.5 3
2.5
3
2.5
3
Interconnection cable size
Number of wire mm21.5 3
2.5
5
2.5
5
Recommended fuse A 15 20 13
Model Unit FHYC25EXV1 FHYC28EXV1 FHYC40EXV1
RY25CXV1 RY28CXV1 RY35DXV1
Power supply cable size
Number of wire mm22.5 3
4.0
3
4.0
3
Interconnection cable size
Number of wire mm22.5 5
2.5
5
2.5
3 & 4
Recommended fuse A 18 18 25
Model Unit FHYC40EXV1 FHYC40EXV1 FHYC50EXV1
RY40DXV1 RY40DXY1 RY50DXY1
Power supply cable size
Number of wire mm24.0 3
2.5
5
2.5
5
Interconnection cable size
Number of wire mm22.5 3 & 4
1.5
3 & 4
1.5
3 & 4
Recommended fuse A 30 13 13
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14
Application Information
4) Refrigerant Piping
Maximum Piping Length and Maximum Number of Bends
When the pipe length becomes too long, both the capacity and reliability drop. As the number of bends increases,
system piping resistance to the refrigerant flow increases, thus lowering the cooling capacity, and as the result
the compressor may become defective. Always choose the shortest path and follow the recommendation as
tabulated below:
Model Indoor FF(Y)10CXV1 FF(Y)15CXV1 FF(Y)20CXV1
Outdoor R(Y)10CXV1 R(Y)15CXV1 R(Y)18/20CXV1
Max. Length, m 12 12 15
Max. Elevation, m 5 5 8
Max. No. of Bends 10 10 10
Model Indoor FH(Y)C20EXV1 FH(Y)C25EXV1 FH(Y)C28EXV1
Outdoor R(Y)20CXV1 R(Y)25CXV1 R(Y)28CXV1
Max. Length, m 15 15 15
Max. Elevation, m 8 8 8
Max. No. of Bends 10 10 10
Model Indoor FH(Y)C40EXV1 FH(Y)C50EXV1
Outdoor R(Y)35/40DXV1 R(Y)40DXY1 R(Y)50DXY1
Max. Length, m 45 45
Max. Elevation, m 25 25
Max. No. of Bends 10 10
Piping sizes (flare connection type) are as follows:
Model R(Y)10CXV1 R(Y)15CXV1 R(Y)18/20CXV1 R(Y)20CXV1
Liquid, mm / in 6.35 / 1/4 6.35 / 1/4 6.35 / 1/4 6.35 / 1/4
Suction, mm / in 9.52 / 3/8 12.70 / 1/2 15.88 / 5/8 15.88 / 5/8
Model R(Y)25CXV1 R(Y)28CXV1 R(Y)35DXV1
Liquid, mm / in 9.52 / 3/8 9.52 / 3/8 9.52 / 3/8
Suction, mm / in 15.88 / 5/8 15.88 / 5/8 19.05 / 3/4
Model R(Y)40DXV1 R(Y)40DXY1 R(Y)50DXY1
Liquid, mm / in 9.52 / 3/8
Suction, mm / in 19.05 / 3/4
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15
Application Information
5) Additional Charge
The refrigerant charge has already charged into the outdoor unit. For the piping length of 7.6m, additional
refrigerant charge after vacuuming is not necessary.
When the piping length is more than 7.6m, please use the table below (unit in gram).
Cooling Only
Indoor FF10CXV1 FF15CXV1 FF20CXV1
Outdoor R10CXV1 R15CXV1 R20CXV1
Add. Charge, g/m 16 16 16
Indoor FHC20EXV1 FHC25EXV1 FHC28EXV1
Outdoor R20CXV1 R25CXV1 R28CXV1
Add. Charge, g/m 38 38 55
Indoor FHC40EXV1 FHC50EXV1
Outdoor R35DXV1 R40DXV1 R40DXY1 R50DXY1
Add. Charge, g/m 56 55 56 55
Heatpump
Indoor FFY10CXV1 FFY15CXV1 FFY20CXV1
Outdoor RY10CXV1 RY15CXV1 RY18/20CXV1
Add. Charge, g/m 23 23 22
Indoor FHYC20EXV1 FHYC25EXV1 FHYC28EXV1
Outdoor RY20CXV1 RY25CXV1 RY28CXV1
Add. Charge, g/m 22 57 58
Indoor FHYC40EXV1 FHYC50EXV1
Outdoor RY35DXV1 RY40DXV1 RY40DXY1 RY50DXY1
Add. Charge, g/m 57 56 56 64
Example: FHC25EXV1 & R25CXV1 with 13m piping length, additional piping length is 5.5m. Thus,
Additional Charge = 5.5m x 38g/m
= 209g
•
•
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16
Sound Data
Sound Data
Sound Pressure Level
Model Speed 1/1 Octave Sound Pressure (dB, ref 20μPa) Overall
(dBA)
Noise
Criteria
125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 8kHz
FF(Y)10CXV1
High 42 45 40 35 27 20 10 41 35
Med 40 42 37 32 24 15 7 38 32
Low 38 40 34 28 20 10 5 35 29
FF(Y)15CXV1
High 45 45 40 35 27 20 11 41 35
Med 41 42 37 32 23 15 9 38 32
Low 38 38 33 28 18 9 8 34 28
FF(Y)20CXV1
High 48 47 43 38 30 24 14 44 38
Med 46 45 40 35 26 19 9 41 35
Low 44 40 36 31 21 12 5 37 31
FH(Y)C20EXV1
High 37 38 35 26 17 8 6 34 30
Med 35 35 34 22 12 6 6 32 29
Low 34 31 31 18 9 6 6 30 25
Quiet 32 28 29 16 7 4 5 28 23
FH(Y)C25EXV1
High 39 40 37 29 22 12 6 37 32
Med 37 37 34 25 17 8 4 34 29
Low 37 37 34 23 15 7 7 33 29
Quiet 36 36 33 22 12 7 8 32 28
FH(Y)C28EXV1
High 46 44 43 36 30 23 12 42 38
Med 39 40 38 30 23 15 7 38 37
Low 38 38 35 26 19 9 5 35 34
Quiet 36 36 33 24 15 6 5 33 30
FH(Y)C40EXV1
High 51 48 47 41 33 31 18 47 43
Med 52 44 44 37 28 24 11 44 39
Low 50 41 40 33 23 15 8 40 35
Quiet 46 36 37 26 15 6 6 36 32
FH(Y)C50EXV1
High 52 50 48 44 35 34 22 49 44
Med 53 45 44 39 29 28 14 45 39
Low 53 43 42 37 27 24 10 43 37
Quiet 51 41 39 32 23 16 6 39 34
Model Measuring Location
FF(Y)10/15/20CXV1
FH(Y)C20/25/28EXV1
Microphone
1.4m
Standard : JIS C 9612
FH(Y)C40EXV1
FH(Y)C50EXV1
Microphone
1.5m
Standard: JIS B 8616
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17
Sound Data
NC Curve
0
10
20
30
40
50
60
70
125 250 500 1000 2000 4000 8000
Octave-band frequency (Hz)
Sound pressure level (dB, ref 20μPa)
NC-20
NC-25
NC-35
NC-40
NC-45
NC-50
NC-55
H
M
L
FF(Y)10CXV1
NC-30
FF(Y)10CXV1
NC-30
FF(Y)15CXV1
0
10
20
30
40
50
60
70
125 250 500 1000 2000 4000 8000
Octave-band frequency (Hz)
Sound pressure level (dB, ref 20μPa)
NC-20
NC-30
NC-25
NC-35
NC-40
NC-45
NC-50
NC-55
H
M
L
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