Electra DCR 25, Delta 25, DCR 35, Delta 35 Service Manual

Service Manual

DC Inverter Delta Series

REFRIGERANT

R410A

HEAT PUMP

MARCH 2005

Indoor Units Outdoor Units

Delta 25 DCR 25
Delta 35 DCR 35

A

LIST OF EFFECTIVE PAGES

Revision Y05-01 Service Manual - Delta DCI

LIST OF EFFECTIVE PAGES

Note: Changes in the pages are indicated by a “Revision#” in the footer of each effected page

(when none indicates no changes in the relevant page). All pages in the following list represent
effected/ non effected pages divided by chapters.

Dates of issue for original and changed pages are:

Original ....... 0 ........ 15 March 2005

Total number of pages in this publication is 54 consisting of the following:

Page
No.

Revision
No. #

Page
No.

Revision
No. #

Page
No.

Revision
No. #

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Appendix -A ...........0

• Zero in this column indicates an original page.

*Due to constant improvements please note that the data on this service manual can be modified
with out notice.
**Photos are not contractual

i

TABLE OF CONTENTS

Revision Y05-01Service Manual - Delta DCI

Table of Contents

1. INTRODUCTION ...................................................................................................1-1

2. PRODUCT DATA SHEET ......................................................................................2-1

3. RATING CONDITIONS ..........................................................................................3-1

4. OUTLINE DIMENSIONS .......................................................................................4-1

5. PERFORMANCE DATA & PRESSURE CURVES ...............................................5-1

6. SOUND LEVEL CHARACTERISTICS ..................................................................6-1

7. ELECTRICAL DATA ..............................................................................................7-1

8. WIRING DIAGRAMS .............................................................................................8-1

9. REFRIGERATION DIAGRAMS .............................................................................9-1

10. TUBING CONNECTIONS ......................................................................................10-1

11. CONTROL SYSTEM .............................................................................................11-1

12. TROUBLESHOOTING ..........................................................................................12-1

13.

EXPLODED VIEWS AND SPARE PARTS LISTS .................................................13-1

14. APPENDIX A .........................................................................................................14-1

1-1

INTRODUCTION

Revision Y05-01Service Manual - Delta DCI

1. INTRODUCTION

1.1 General

The new Delta DC Inverter split wall mounted series comprise RC (heat pump)
models, as follows:

● Delta 25

● Delta 35

The indoor Delta units are available as LED display types only, featuring esthetic
design, compact dimensions, and low noise operation.

1.2 Main Features

The Delta series benefits from the most advanced technological innovations, namely:

●

DC Inverter Technology

● R410A

● Microprocessor control.

● Infrared remote control with liquid crystal display.

● Indoor large diameter cross flow fan, allowing low noise level operation.

● Bended indoor coil with treated aluminum fins and coating for improved
efficiency.

● High COP.

● Pre-Charged units up to the max allowing tubing distance.

● Cooling operation at outdoor temperature down to 10ºC

● Heating operation at outdoor temperature down to -15ºC

● Advanced test and diagonstics mode.

● M2L diagnistics softwear cable port (for PC)

● Easy access to the interconnecting tubing and wiring connections, so that
during installation removing the front grill or casing is not necessary.

● Refrigerant pipes can be connected to the indoor unit from 5 different optional
directions.

● Automatic treated air sweep.

● Easy installation and service.

1-2

INTRODUCTION

Revision Y05-01 Service Manual - Delta DCI

1.3 Indoor Unit

The indoor unit is wall mounted, and can be easily fitted to many types of residential
and commercials applications.

It includes:

● Casing with air inlet and outlet grills.

● A large-diameter tangential fan.

● Bended coil with treated aluminum fins.

● Motorized flaps.

● Variable Speed motor (PG).

● Advanced electronic control box assembly.

● Interconnecting wiring terminal block.

● Mounting plate

.

1.4 Filtration

The Delta series presents several types of air filters:

● Easily accessible, and re-usable pre-filters (mesh)

● Pre-charged electrostatic filter (optional)

● Active carbon filter (optional)

1.5 Control

The microprocessor indoor controller, and an infrared remote control, supplied as
standard, provide complete operating function and programming. For further details
please refer to the Operation Manual, Appendix A.

1.6 Outdoor Unit

The Delta outdoor units can be installed as floor or wall mounted units by using a
wall supporting bracket. The metal sheets are protected by anti- corrosion paint work
allowing long life resistance. All outdoor units are pre-charged. For further information
please refer to the Product Data Sheet, Chapter 2.

It includes :

● Single DC Rotary Compressor mounted in a soundproofed compartment

● Axial fan.

● Outdoor coil with hydrophilic louver fins.

● Outlet air fan grill.

● Outdoor advanced contoler.

● 2 fan speed AC motor

1-3

INTRODUCTION

Revision Y05-01Service Manual - Delta DCI

1.7 Tubing Connections

Flare type interconnecting tubing to be produced on site.
For further details please refer to the Installation Manual, Appendix A

1.8 Inbox Documentation

Each unit is supplied with its own installation and operation manuals,

1.9 Matching Table

OUTDOOR UNITS

INDOOR UNITS

MODEL REFR” Delta 25 Delta 35

DCR 25 R410A √

DCR 35 R410A

√

2-1

PRODUCT DATA SHEET

Revision Y05-01Service Manual - Delta DCI

2. PRODUCT DATA SHEET

2.1 R410A

Model Indoor Unit DELTA 25
Model Outdoor Unit DCR 25
Installation Method of Pipe Flared

Characteristics Units Cooling Heating

Capacity

(1)

Btu/hr 8530(4440-10240) 9550(4774-11940)

kW 2.5(1.3-3.0) 2.8(1.4-3.5)

Power input

(1)

kW 0.75 0.82

EER (Cooling) or COP(Heating)

(1)

W/W 3.38 3.41
Energy efficiency class A B
Power supply V/Ph/Hz 220-240V/Single/50Hz
Rated current A 3.2 3.6
Starting current A 10
Circuit breaker rating A 12

INDOOR

Fan type & quantity Crossflow x 1
Fan speeds H/M/L RPM 1200/1050/850
Air flow

(2)

H/M/L m3/hr 420/350/270
External static pressure Min-Max Pa 0
Sound power level

(3)

H/M/L dB(A) 52/48/45
Sound pressure level

(4)

H/M/L dB(A) 39/35/32
Moisture removal l/hr 1
Condensate drain tube I.D mm 16
Dimensions WxHxD mm 680x200x250
Weight kg 7
Package dimensions WxHxD mm 740x265x320
Packaged weight kg 10
Units per pallet units 36 units per pallet
Stacking height units 9 levels

OUTDOOR

Refrigerant control EEV
Compressor type, model Rotary, Panasonic 5RS092XDJ01
Fan type & quantity Propeller(direct) x 1
Fan speeds H/L RPM 760
Air flow H/L m3/hr 1390
Sound power level H/L dB(A) 64
Sound pressure level

(4)

H/L dB(A) 54
Dimensions WxHxD mm 760x245x545
Weight kg 36
Package dimensions WxHxD mm 880x310x610
Packaged weight kg 39
Units per pallet Units 12 units per pallet
Stacking height units 3 levels
Refrigerant type R410A
Refrigerant chargless distance kg/m 0.85kg/7.5m
Additional charge per 1 meter g/m No need

Connections between

units

Liquid line In.(mm) 1/4”(6.35)
Suction line In.(mm) 3/8”(9.53)
Max.tubing length m. Max.15

Max.height
difference

m. Max. 10

Operation control type Remote control
Heating elements kW
Others

(1) Rating conditions in accordance with ISO 5151 and ISO 13253 (for ducted units) and EN 14511.
(2) Airflow in ducted units; at nominal external static pressure.
(3) Sound power in ducted units is measured at air discharge.
(4) Sound pressure level measured at 1 meter distance from unit.

2-2

PRODUCT DATA SHEET

Revision Y05-01 Service Manual - Delta DCI

Model Indoor Unit DE LTA 35
Model Outdoor Unit DCR 35
Installation Method of Pipe Flared

Characteristics Units Cooling Heating

Capacity

(1)

Btu/hr 11940(4440-13990) 12280(5115-13990)

kW 3.5(1.3-4.1) 3.6(1.65-4.1)

Power input

(1)

kW 1.03 1.05

EER (Cooling) or COP(Heating)

(1)

W/W 3.39 3.43
Energy efficiency class A B
Power supply V/Ph/Hz 220-240V/Single/50Hz
Rated current A 4.9 4.8
Starting current A 10.5
Circuit breaker rating A 15

INDOOR

Fan type & quantity Crossflow x 1
Fan speeds H/M/L RPM 1200/1000/850
Air flow

(2)

H/M/L m3/hr 550/450/350
External static pressure Min-Max Pa 0
Sound power level

(3)

H/M/L dB(A) 52/46/42
Sound pressure leve

l

(4)

H/M/L dB(A) 39/33/29
Moisture removal l/hr 1.5
Condensate drain tube I.D mm 16
Dimensions WxHxD mm 840x200x250
Weight kg 8
Package dimensions WxHxD mm 930x265x320
Packaged weight kg 11
Units per pallet units 36 units per pallet
Stacking height units 9 levels

OUTDOOR

Refrigerant control EEV
Compressor type, model Rotary, Panasonic 5RS102XAB
Fan type & quantity Propeller(direct) x 1
Fan speeds H/L RPM 760
Air flow H/L m3/hr 1390
Sound power level H/L dB(A) 65
Sound pressure level

(4)

H/L dB(A) 55
Dimensions WxHxD mm 760x245x545
Weight kg 37
Package dimensions WxHxD mm 880x310x610
Packaged weight kg 40
Units per pallet Units 12 units per pallet
Stacking height units 3 levels
Refrigerant type R410A
Refrigerant chargless distance kg/m 1.0kg/7.5m
Additional charge per 1 meter g/m No need

Connections between units

Liquid line In.(mm) 1/4”(6.35)
Suction line In.(mm) 3/8”(9.53)
Max.tubing length m. Max.15

Max.height
difference

m. Max. 10

Operation control type Remote control
Heating elements kW No
Others

(1) Rating conditions in accordance with ISO 5151 and ISO 13253 (for ducted units) and EN 14511.
(2) Airflow in ducted units; at nominal external static pressure.
(3) Sound power in ducted units is measured at air discharge.
(4) Sound pressure level measured at 1 meter distance from unit.

3-1

RATING CONDITIONS

Revision Y05-01Service Manual - Delta DCI

3. RATING CONDITIONS

Rating conditions in accordance with ISO 5151 and ISO 13253 (for ducted units).

Cooling:

Indoor: 27

o

C DB 19oC WB

Outdoor: 35

o

C DB

Heating:

Indoor: 20

o

C DB

Outdoor: 7

o

C DB 6oC WB

3.1 Operating Limits

3.1.1 R410A

Indoor Outdoor

Cooling

Upper limit

32oC DB 23oC WB 46oC DB

Lower limit

21oC DB 15oC WB 10oC DB

Heating

Upper limit

27oC DB 24oC DB 18oC WB

Lower limit

10oC DB -15oC DB -16oC WB

Voltag e

198 – 264 V

4-1

OUTLINE DIMENSIONS

Revision Y05-01Service Manual - Delta DCI

4. OUTLINE DIMENSIONS

4.1 Indoor Unit: Delta 25 DCI

4.2

Indoor Unit: Delta 35 DCI

4-2

OUTLINE DIMENSIONS

Revision Y05-01 Service Manual - Delta DCI

4.3 Outdoor Unit: DCR 25/35 DCI

AI R OUTL E T

AI R I NTAKE

5-1

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - Delta DCI

5. PERFORMANCE DATA

5.1 Delta 25 DCI

5.1.1 Cooling Capacity (kW) - Run Mode (Unit A or B)

230[V] : Indoor Fan at High Speed.

ID COIL ENTERING AIR DB/WB TEMPERATURE [

0

C]

OD COIL

ENTERING AIR DB

TEMPERATURE

[0C]

DATA

22/15 24/17 27/19 29/21 32/23

-10 - 20

(protection range)

TC 80 - 110 % of nominal
SC 80 - 105 % of nominal

PI 25 - 50 % of nominal

25

TC 2.41 2.57 2.73 2.89 3.05
SC 1.67 1.71 1.74 1.77 1.81

PI 0.57 0.58 0.60 0.61 0.62

30

TC 2.30 2.46 2.62 2.77 2.93
SC 1.63 1.67 1.70 1.76 1.77

PI 0.64 0.65

0.66

0.67 0.68

35

TC 2.18 2.34

2.50

2.66 2.82

SC 1.59 1.63 1.66 1.69 1.73

PI 0.71 0.72

0.73

0.74 0.75

40

TC 2.07 2.23

2.39

2.54 2.70

SC 1.55 1.59 1.62 1.65 1.69

PI 0.78 0.79 0.80 0.81 0.82

46

TC 1.93 2.09 2.25 2.41 2.56
SC 1.50 1.54 1.57 1.61 1.64

PI 0.86 0.87 0.88 0.89 0.90

LEGEND

TC – Total Cooling Capacity, kW
SC – Sensible Capacity, kW
PI – Power Input, kW
WB – Wet Bulb Temp., (

o

C)

DB – Dry Bulb Temp., (

o

C)
ID – Indoor
OD – Outdoor

5.1.2 Capacity Correction Factors

Cooling Capacity Ratio Vs. Outdoor Temperature

0.50

0.60

0.70

0.80

0.90

1.00

1.10

1.20

20 25 30 35 40 45

Outdoor Temperature [deg C]

Capacity Ratio

5-2

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - Delta DCI

5.1.3 Heating Capacity (kW) - Run Mode(Unit A or B)

230[V] : Indoor Fan at High Speed.

ID COIL ENTERING AIR DB TEMPERATURE [0C]

OD COIL

ENTERING

AIR DB/WB

TEMPERATURE

[

0

C]

DATA 15 20 25

-15/-16

TC 1.78 1.66 1.53

PI 0.49 0.54 0.59

-10/-12

TC 1.98 1.86 1.73

PI 0.59 0.64 0.69

-7/-8

TC 2.14 2.01 1.89

PI 0.67 0.72 0.77

-1/-2

TC 2.21 2.09 1.96

PI 0.71 0.76 0.81

2/1

TC 2.26 2.14 2.01

PI 0.73

0.78

0.83

7/6

TC 32.92

2.80

2.68

PI 0.77

0.82

0.87

10/9

TC 3.09

2.96

2.84

PI 0.82 0.87 0.92

15/12

TC 3.25 3.12 3.00

PI 0.86 0.91 0.96

15-24

TC 85 - 105 % of nominal

(Protection Range)

PI 80 - 120 % of nominal

LEGEND

TC – Total Cooling Capacity, kW
PI – Power Input, kW
WB – Wet Bulb Temp., (

o

C)

DB – Dry Bulb Temp., (

o

C)
ID – Indoor
OD – Outdoor

5.1.4 Capacity Correction Factors

Hea ting Cap acity Ra tio V s. Outdoo r Te mperature

0.50

0.60

0.70

0.80

0.90

1.00

1.10

1.20

-15 -10 -5 0 5 10 15

Outdoor WB Temperature [deg C]

Capacit y Ration

5-3

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - Delta DCI

5.2 Delta 35 DCI

5.2.1 Cooling Capacity (kW) - Run Mode (Unit A or B)

230[V] : Indoor Fan at High Speed.

ID COIL ENTERING AIR DB/WB TEMPERATURE [0C]

OD COIL

ENTERING AIR DB

TEMPERATURE [

0

C]

DATA

22/15 24/17 27/19 29/21 32/23

-10 - 20

(protection range)

TC 80 - 110 % of nominal
SC 80 - 105 % of nominal

PI 25 - 50 % of nominal

25

TC 3.38 3.60 3.82 4.04 4.26
SC 2.54 2.59 2.64 2.69 2.74

PI 0.79 0.81 0.82 0.84 0.85

30

TC 3.22 3.44 3.66 3.88 4.10
SC 2.48 2.53 2.58 2.63 2.68

PI 0.89 0.90

0.92

0.93 0.95

35

TC 3.06 3.28

3.50

3.72 3.94

SC 2.42 2.47 2.52 2.57 2.62

PI 0.98 0.99

1.01

1.03 1.04

40

(Protection Range)

TC 2.90 3.12

3.34

3.56 3.78

SC 2.36 2.41 2.46 2.51 2.56

PI 1.07 1.09 1.10 1.12 1.13

46

(Protection Range)

TC 2.70 2.92 3.15 3.37 3.59
SC 2.28 2.34 2.39 2.44 2.49

PI 1.18 1.20 1.21 1.23 1.24

LEGEND

TC – Total Cooling Capacity, kW
SC – Sensible Capacity, kW
PI – Power Input, kW
WB – Wet Bulb Temp., (

o

C)

DB – Dry Bulb Temp., (

o

C)
ID – Indoor
OD – Outdoor

5.2.2 Capacity Correction Factors

Cooling Capacity Ratio Vs. Outdoor Temperature

0.50

0.60

0.70

0.80

0.90

1.00

1.10

1.20

20 25 30 35 40 45

Outdoor Temperature [deg C]

Capacity Ratio

5-4

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - Delta DCI

5.2.3 Heating Capacity (kW) - Run Mode(Unit A or B)

230[V] : Indoor Fan at High Speed.

ID COIL ENTERING AIR DB TEMPERATURE [0C]

OD COIL

ENTERING

AIR DB/WB

TEMPERATURE

[

0

C]

DATA 15 20 25

-15/-16

TC 2.29 2.13 1.97

PI 0.61 0.67 0.73

-10/-12

TC 2.55 2.39 2.23

PI 0.73 0.79 0.85

-7/-8

TC 2.75 2.58 2.42

PI 0.82 0.89 0.95

-1/-2

TC 2.84 2.68 2.52

PI 0.87 0.93 0.99

2/1

TC 2.91 2.75 2.59

PI 0.90

0.96

1.02

7/6

TC 3.76

3.60

3.44

PI 0.95

1.01

1.07

10/9

TC 3.97

3.81

3.65

PI 1.01 1.07 1.13

15/12

TC 4.17 4.01 3.85

PI 1.06 1.12 1.18

15-24

TC 85 - 105 % of nominal

(Protection Range)

PI 80 - 120 % of nominal

LEGEND

TC – Total Cooling Capacity, kW
PI – Power Input, kW
WB – Wet Bulb Temp., (

o

C)

DB – Dry Bulb Temp., (

o

C)
ID – Indoor
OD – Outdoor

5.2.4 Capacity Correction Factors

Hea ting Cap acity Ra tio V s. Outdoo r Te mperature

0.50

0.60

0.70

0.80

0.90

1.00

1.10

1.20

-15 -10 -5 0 5 10 15

Outdoor WB Temperature [deg C]

Capacit y Ration

5-5

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - Delta DCI

5.3 Capacity Correction Factor Due to Tnbing Length

5.3.1 Delta 25 DCI: Cooling

5.3.2 Heating

0.90

0.91

0.92

0.93

0.94

0.95

0.96

0.97

0.98

0.99

1.00

1.01

3579111315

Tubing Length [m]

Capacity Ratio

0.84

0.86

0.88

0.90

0.92

0.94

0.96

0.98

1.00

1.02

3579111315

Tubing Length [m]

Capacity Ratio

5-6

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - Delta DCI

5.3.3 Delta 35 DCI: Cooling

5.3.4 Heating

0.94

0.95

0.96

0.97

0.98

0.99

1.00

1.01

3 5 7 9 11 13 15

Tubing Length [m]

Capacity Ratio

0.97

0.98

0.98

0.99

0.99

1.00

1.00

1.01

3 5 7 9 11 13 15

Tubing Length [m]

Capacity Ratio

5-7

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - Delta DCI

5.4 Pressure Curves

5.4.1. Model: Delta 25 DCI Cooling — Test Mode

Suction Pressure VS.Outdoor Temp.

500

600

700

800

900

1000

1100

10 15 20 25 30 35 40 45

Outdoor DB Temperature [ºC]

Suction Pressure [kPa]

22/15 D B/WB
24/17 D B/WB
27/19 D B/WB
29/21 D B/WB

32/23 D B/WB

Discharge Pressure VS. Outdoor Temp.

1000

1250

1500

1750

2000

2250

2500

2750

3000

3250

3500

3750

4000

10 15 20 25 30 35 40 45

Outdoor DB Temperature [ºC]

Discharge Pressure [kPa]

22/15 D B/WB
24/17 D B/WB
27/19 D B/WB
29/21 D B/WB
32/23 D B/WB

5-8

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - Delta DCI

5.4.2 Heating — Test Mode.

Suction Pressure VS. Outdoor Temp.

300

400

500

600

700

800

900

1000

-15 -10 -5 0 5 10 15

Outdoor WB Temperature [ºC]

Suction Pressure [kPa]

15 DB

20 DB

25 DB

Discharge Pressure VS. Outdoor Temp.

1500

1750

2000

2250

2500

2750

3000

3250

3500

3750

4000

-15 -10 -5 0 5 10 15

Outdoor WB Temperature [ºC]

Discharge Pressure [kPa]

15 DB

20 DB

25 DB

5-9

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - Delta DCI

5.5 Model: Delta 35 DCI Cooling — Test Mode

Suction Pressure VS. Outdoor Temp.

400

500

600

700

800

900

1000

1100

1200

10 15 20 25 30 35 40 45

Outdoor DB Temperature [ºC]

Suction Pressure [kPa]

22/15 D B/WB
24/17 D B/WB
27/19 D B/WB
29/21 D B/WB
32/23 D B/WB

Discharge Pressure VS. Outdoor Temp.

1000

1250

1500

1750

2000

2250

2500

2750

3000

3250

3500

3750

4000

10 15 20 25 30 35 40 45

Outdoor DB Temperature [ºC]

Discharge Pressure [kPa]

22/15 DB /WB
24/17 DB /WB
27/19 DB /WB
29/21 DB /WB

32/23 DB /WB

5-10

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - Delta DCI

5.6 Heating — Test Mode

Suction Pressure VS. Outdoor Temp.

300

400

500

600

700

800

900

1000

-15 -10 -5 0 5 10 15

Outdoor WB Tempera ture [ºC]

Suction Pressure [kPa]

15 DB

20 DB

25 DB

Discharge Pressure VS. Outdoor Temp.

1500

1750

2000

2250

2500

2750

3000

3250

3500

3750

4000

-15 -10 -5 0 5 10 15
Outdoor WB Temperature[ºC]

Discharge Pressure [kPa]

15 DB

20 DB

25 DB

6-1

SOUND LEVEL CHARACTERISTICS

Revision Y05-01Service Manual - Delta DCI

6. SOUND LEVEL CHARACTERISTICS

6.1 Sound Pressure Level

Figure 1. Wall Mounted Figure 2. Floor Mounted

Figure 3. Ducted Figure 4. Cassette

6.2 Soud Pressure Level Spectrum (Measured as Figure 1)

Delta 25 Delta 35

BAND CENTER FREQUENCIES, Hz

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR

FAN SPEED LINE

HI

ME

LO

6-2

SOUND LEVEL CHARACTERISTICS

Revision Y05-01 Service Manual - Delta DCI

6.3 Outdoor units

6.4 Sound Pressure Level Spectrum (Measured as Figure 5)

DCR 25 Cooling DCR 25 Heating

DCR 35 Cooling DCR 35 Heating

Microphone Distance from Unit

BAND CENTER FREQUENCIES, Hz

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR