Mitsubishi Electric PUHZ-HRP71VHA User manual

SERVICE MANUAL No.OCH425
REVISED EDITION-B
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
R410A
December 2009
PUHZ-HRP71VHA
PUHZ-HRP100VHA
PUHZ-HRP100YHA
PUHZ-HRP125YHA
NOTE:
• This manual describes only
service data of the outdoor
units.
• RoHS compliant products
have <G> mark on the spec
name plate.
PARTS CATALOG (OCB425)
Outdoor unit
[model names]
PUHZ-HRP71VHA
PUHZ-HRP100VHA
PUHZ-HRP100YHA
PUHZ-HRP125YHA
PUHZ-HRP71VHA2
PUHZ-HRP100VHA2
PUHZ-HRP100YHA2
PUHZ-HRP125YHA2
[Service Ref.]
PUHZ-HRP71VHA
PUHZ-HRP100VHA
PUHZ-HRP100YHA
PUHZ-HRP125YHA
PUHZ-HRP71VHA2
PUHZ-HRP71VHA2R1
PUHZ-HRP100VHA2
PUHZ-HRP100VHA2R1
PUHZ-HRP100YHA2
PUHZ-HRP100YHA2R1
PUHZ-HRP125YHA2
PUHZ-HRP125YHA2R1
CONTENTS
1. TECHNICAL CHANGES·······························2
2. REFERENCE MANUAL································2
3. SAFETY PRECAUTION ·······························3
4. FEATURES ···················································7
5. SPECIFICATIONS ········································8
6. DATA·····························································9
7. OUTLINES AND DIMENSIONS··················12
8. WIRING DIAGRAM·····································14
9. WIRING SPECIFICATIONS························20
10. REFRIGERANT SYSTEM DIAGRAM········25
11. TROUBLESHOOTING································27
12. FUNCTION SETTING·································85
13. MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER ····92
14. EASY MAINTENANCE FUNCTION·········102
15. DISASSEMBLY PROCEDURE·················107
Revision:
• PUHZ-HRP71/100VHA2R1 and
PUHZ-HRP100/125YHA2R1
are added in REVISED
EDITION-B.
• Some descriptions have been
modified.
• Please void OCH425
REVISED EDITION-A.

2
1TECHNICAL CHANGES
2REFERENCE MANUAL
PUHZ-HRP 71VHA2 PUHZ-HRP 71VHA2R1
PUHZ-HRP100VHA2 PUHZ-HRP100VHA2R1
PUHZ-HRP100YHA2
PUHZ-HRP100YHA2R1
PUHZ-HRP125YHA2 PUHZ-HRP125YHA2R1
• Replace filter has been deleted.
• Outdoor controller board (C.B.) has been changed. (S/W version up)
1. DRAIN HOSE HEATER (option: PAC-SE60RA-E) is connectable.
2. The starting temperature of FLASH INJECTION is settable.
PUHZ-HRP 71VHA PUHZ-HRP 71VHA2
PUHZ-HRP100VHA PUHZ-HRP100VHA2
• Pressure sensor (63HS) has been added.
• Compressor (MC) has been changed.
ANB33FJCMT
ANB33FJEMT
• Thermistor (Discharge / TH4) has been changed.
• Fan motors (MF1,2) have been changed.
• Fan grilles have been changed.
• Electrical parts have been changed.
Controller circuit board (C.B.), Power circuit board (P.B.),
Noise filter circuit board (N.F.) and Active filter module (ACTM) (including P.B.)
PUHZ-HRP100YHA PUHZ-HRP100YHA2
PUHZ-HRP125YHA PUHZ-HRP125YHA2
• Pressure sensor (63HS) has been added.
• Compressor (MC) has been changed.
ANB33FJBMT
ANB33FJDMT
• Thermistor (Discharge / TH4) has been changed.
• Fan motors (MF1,2) have been changed.
• Fan grilles have been changed.
• Controller circuit board (C.B.) has been changed.
2-1. INDOOR UNIT SERVICE MANUAL
Model name Service Ref. Service
Manual No.
PLA-RP35/50/60/71/100/125BA
PLA-RP100/125/140BA2 PLA-RP35/50/60/71/100/125BA(1).UK/BA#2.UK
PLA-RP100/125/140BA2.UK OCH412 OCB412
PLA-RP100BA3 PLA-RP100BA3 OCH459
OCB459
PKA-RP60/100KAL PKA-RP60100KAL.TH OCH452
OCB452
PKA-RP60/100FAL PKA-RP50FAL2 PKA-RP60/100FAL PKA-RP50FAL2 OC331
PKA-RP50HAL PKA-RP50HAL OCH453
OCB453
PEAD-RP50/60/71/100/125/JA(L) PEAD-RP50/60/71/100/125/JA(L)(R1).UK HWE08130
BWE09220
PEAD-RP50/60/71/125EA
PEAD-RP100EA2 PEAD-RP50/60/71/125EA.UK PEAD-RP100EA2.UK HWE05210
PEA-RP60/71/100GA PEA-RP60/71/100GA.UK HWE05060
1-2. TECHNICAL DATABOOK
MANUAL NO. OCS11

3
3SAFETY PRECAUTION
3-2. CAUTIONS RELATED TO NEW REFRIGERANT
Cautions for units utilizing refrigerant R410A
Use new refrigerant pipes.
Make sure that the inside and outside of refrige-
rant piping is clean and it has no contamination
such as sulfur hazardous for use, oxides, dirt,
shaving particles, etc.
In addition, use pipes with specified thickness.
Store the piping to be used indoors during
installation, and both ends of the piping sealed
until just before brazing. (Leave elbow joints, etc.
in their packaging.)
Use ester oil, ether oil or alkylbenzene oil (small
amount) as the refrigerant oil applied to flares
and flange connections.
In case of using the existing pipes for R22, be careful with
the followings.
· Be sure to perform replacement operation before test run.
· Change flare nut to the one provided with this product.
Use a newly flared pipe.
· Avoid using thin pipes.
Charge refrigerant from liquid phase of gas
cylinder.
If the refrigerant is charged from gas phase, composition change
may occur in refrigerant and the efficiency will be lowered.
Do not use refrigerant other than R410A.
If other refrigerant (R22 etc.) is used, chlorine in refrige-
rant can cause deterioration of refrigerant oil etc.
Use a vacuum pump with a reverse flow check
valve.
Vacuum pump oil may flow back into refrigerant cycle and
that can cause deterioration of refrigerant oil etc.
Use the following tools specifically designed for
use with R410A refrigerant.
The following tools are necessary to use R410A refrigerant.
Handle tools with care.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of refrigera-
nt will change and the efficiency will be lowered.
Flare tool
Electronic refrigerant
charging scale
Vacuum pump adaptor
Size adjustment gauge
Gauge manifold
Torque wrench
Gas leak detector
Charge hose
Tools for R410A
Contamination inside refrigerant piping can cause deterio-
ration of refrigerant oil etc.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of compressor.
If large amount of mineral oil enters, that can cause deterio-
ration of refrigerant oil etc.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
3-1. ALWAYS OBSERVE FOR SAFETY
Before obtaining access to terminal, all supply circuits must be disconnected.
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.
• Discharge the condenser 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 refrigerating 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.

4
Gravimeter
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
[4] Refrigerant leakage detection function
This air conditioner can detect refrigerant leakage which may happen during a long period of use. In order to enable the
leakage detection, settings are required to let the unit memorize the initial conditions (initial learning).
Refer to 14-3. INITIAL SETTINGS FOR REFRIGERANT LEAKAGE DETECTION FUNCTION.
[1] Cautions for service
(1) Perform service after recovering the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.
[2] Additional refrigerant charge
When charging directly from cylinder
· Check that cylinder for R410A on the market is syphon type.
· Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
No. Tool name Specifications
1Gauge manifold · Only for R410A
· Use the existing fitting specifications. (UNF1/2)
· Use high-tension side pressure of 5.3 MPa·G or over.
2Charge hose · Only for R410A
· Use pressure performance of 5.09 MPa·G or over.
3Electronic scale —
4Gas leak detector · Use the detector for R134a, R407C or R410A.
5Adaptor for reverse flow check · Attach on vacuum pump.
6Refrigerant charge base —
7Refrigerant cylinder · Only for R410A · Top of cylinder (Pink)
· Cylinder with syphon
8Refrigerant recovery equipment —

5
3-3. PRECAUTIONS WHEN REUSING EXISTING R22 REFRIGERANT PIPES
(1) Flowchart
Connecting a new air conditioner
Flaring work should be done so that flare meets the dimension for R410A.
Use flare nut provided with indoor and outdoor unit.
When using gas piping of :19.05mm for HRP100, 125.
Make sure that DIP SW8-1 on outdoor unit controller board is set to ON.
This is to keep the pressure on pipes within permissible range.
●Use different diameter joint or adjust the piping size by brazing.
When using pipes larger than specified size for HRP71.
Make sure that DIP SW8-1 on outdoor unit controller board is set to ON.

This is to prevent oil flow ratio from lowering due to the decrease in flowing refrigerant.
●Use different diameter joint or adjust the piping size by brazing.
When existing pipes are specified size.
The pipes can be reused referring to TECHNICAL DATA BOOK (OCS11).
●Use different diameter joint or adjust the piping size by brazing.
* When using existing pipes for HRP71, 100, 125HA(2).
Make sure that DIP SW8-2 on outdoor unit controller board is set to ON and perform
replacement operation.
+Chemical compounds containing chlorine left in existing pipes are collected by replace filter.
●The air conditioner automatically performs cooling operation through replace filter for about 2 hours.
HRP·HA(2) HRP·HA2R1
Measure the existing pipe thickness and check for damage.
Check if existing air conditioner can operate.
Existing air conditioner can
operate.
Disconnect existing air con-
ditioner from piping.
Existing pipes can be reused.
In case the unit is HRP·HA2R1 In case the unit is HRP·HA(2)
Perform cooling operation
for about 30 minutes and
then do a pump down work.
Use a refrigerant recovery
equipment to recover the
refrigerant.
Existing air conditioner
cannot operate.
The existing pipe thickness meets speci-
fications and the pipes are not damaged.
The existing pipe thickness does not meet
specifications or the pipes are damaged.
Connect a new air conditioner. Connect a new air conditioner.
Perform replacement operation.
·When performing replacement operation, make sure that DIP SW8-2 on outdoor unit controller board is
set to ON.
+Chemical compounds containing chlorine left in existing pipes are collected by replace filter.
●The air conditioner automatically performs cooling operation through replace filter for about 2 hours.
Existing pipes cannot be
reused. Use new pipes.
+In case existing pipes were used
for gas or oil heat pump system,
be sure to clean the pipes.

6
(2) Cautions for refrigerant piping work
New refrigerant R410A is adopted for replacement inverter series. Although the refrigerant piping work for R410A is same
as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the working
pressure of R410A is 1.6 time higher than that of R22, their sizes of flared sections and flare nuts are different.
1Thickness of pipes
Because the working pressure of R410A is higher compared to R22, be sure to use refrigerant piping with thickness
shown below. (Never use pipes of 0.7 mm or below.)
2Dimensions of flare cutting and flare nut
The component molecules in HFC refrigerant are smaller compared to conventional refrigerants. In addition to that,
R410A is a refrigerant, which has higher risk of leakage because its working pressure is higher than that of other refrig-
erants. Therefore, to enhance airtightness and intensity, flare cutting dimension of copper pipe for R410A have been
specified separately from the dimensions for other refrigerants as shown below. The dimension B of flare nut for R410A
also has partly been changed to increase intensity as shown below. Set copper pipe correctly referring to copper pipe
flaring dimensions for R410A below. For 1/2 and 5/8 inch, the dimension B changes.
Use torque wrench corresponding to each dimension.
3Tools for R410A (The following table shows whether conventional tools can be used or not.)
1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
0.8
0.8
0.8
1.0
—
0.8
0.8
0.8
1.0
1.0
Nominal
dimensions(inch)
Diagram below: Piping diameter and thickness
Outside
diameter (mm)
Thickness (mm)
R410A R22
1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
9.1
13.2
16.6
19.7
—
9.0
13.0
16.2
19.4
23.3
Nominal
dimensions(inch)
Flare cutting dimensions
Outside
diameter
Dimension A ( )
+0
-0.4
(mm)
R410A R22
1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
17.0
22.0
26.0
29.0
-
17.0
22.0
24.0
27.0
36.0
Nominal
dimensions(inch)
Flare nut dimensions
Outside
diameter
Dimension B
(mm)
R410A
+
+36.0mm for
indoor unit
of RP100,
125 and 140
R22
Gauge manifold
Charge hose
Gas leak detector
Refrigerant recovery equipment
Refrigerant cylinder
Applied oil
Safety charger
Charge valve
Vacuum pump
Flare tool
Bender
Pipe cutter
Welder and nitrogen gas cylinder
Refrigerant charging scale
Vacuum gauge or thermis-
tor vacuum gauge and
vacuum valve
Charging cylinder
Air purge, refrigerant charge
and operation check
Gas leak check
Refrigerant recovery
Refrigerant charge
Apply to flared section
Prevent compressor malfunction
when charging refrigerant by
spraying liquid refrigerant
Prevent gas from blowing out
when detaching charge hose
Vacuum drying and air
purge
Flaring work of piping
Bend the pipes
Cut the pipes
Weld the pipes
Charge refrigerant
Check the degree of vacuum. (Vacuum
valve prevents back flow of oil and refri-
gerant to thermistor vacuum gauge)
Refrigerant charge
Tool exclusive for R410A
Tool exclusive for R410A
Tool for HFC refrigerant
Tool exclusive for R410A
Tool exclusive for R410A
Ester oil, ether oil and alky-
lbenzene oil (minimum amount)
Tool exclusive for R410A
Tool exclusive for R410A
Tools for other refrigerants can
be used if equipped with adop-
ter for reverse flow check
Tools for other refrigerants
can be used by adjusting
flaring dimension
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants
can be used
Tool exclusive for R410A
Tools and materials Use R410A tools Can R22 tools be used?
(Usable if equipped
with adopter for rever-
se flow)
(Usable by adjusting
flaring dimension)
Can R407C tools be used?
Ester oil, ether oil:
Alkylbenzene oil: minimum amount
(Usable if equipped
with adopter for rever-
se flow)
(Usable by adjusting
flaring dimension)
: Prepare a new tool. (Use the new tool as the tool exclusive for R410A.)
: Tools for other refrigerants can be used under certain conditions.
: Tools for other refrigerants can be used.
Dimension A
Dimension B

7
4FEATURES
HIGH HEATING CAPACITY
Industry-first flash injection circuit is equipped, which enables to
keep the equal capacity with the rating even when outside tem-
perature is -15:.
HIGH SPEED HEATING START UP
The performance of heating start up is improved. Compared to
RP type, Zubadan reduced the time for heating start up by about
half. After starting operation, the airflow temperature goes up to
45:quickly in 10 minutes. With industry-first shorter and less
frequent defrost, defrosting time is cut down by 15% compared
to RP type and heating operation can continuously run for maxi-
mum 150 minutes.
WIDE HEATING RANGE
The heating range is expanded to -25:compared to RP type
which is up to -20:.
CHARGELESS SYSTEM
PRE-CHARGED REFRIGERANT IS SUPPLIED FOR PIPING LENGTH AT SHIPMENT.
Max.30m (PUHZ-HRP71/100/125)
The refrigerant circuit with LEV (Linear Expansion Valve) and power receiver always control the optimal refrigerant level
regardless of the length (30 m max. and 5 m min.) of piping. The additional refrigerant charging work during installation
often causes problems. It is completely eliminated by chargelss system. This unique system improves the quality and reli-
ability of the work done. It also helps to speed up the installation time.
REFRIGERANT LEAKAGE DETECTION FUNCTION
PUHZ-HRP·HA(2) can detect refrigerant leakage which may happen during a long period of use.
PUHZ-HRP71/100VHA
PUHZ-HRP100/125YHA
Outdoor W.B. temp.
Heating capacity
-25-20-15-10-50
RP71
RP125
RP100
HRP125
HRP100
HRP71
(kW)
0
Performance
about 30%UP
15
10
13kW
(Outlet air temp. 45)
About 10min.
Stable
About 50% CUT
Elapsed time(min.)
Heating capacity(Peak)
About 19 min.
When stabled,
hot air of 50
RP type:
Outlet air temp. 45
HRP100
Outlet air temp.45+1
15
(kW)
10
5101520
0
It doesn’t reach 50
when outside air temp.
is too low,
+1 Condition
Room temp. 20(D.B.) Outdoor temp. 2(D.B.)/1(W.B.) : Unit HRP100, Hi notch
(Indoor PKA type)
0
Expanded
Up to -25

Outdoor wet-bulb temperature
RP type
HRP type
- 25 
- 11~
- 20 
-25-20-15-10-50
PUHZ-HRP71/100VHA2
PUHZ-HRP100/125YHA2
PUHZ-HRP71/100VHA2R1
PUHZ-HRP100/125YHA2R1

8
A
kW
W
kW
*
/min(CFM )
dB
dB
mm(in.)
mm(in.)
mm(in.)
kg(lbs)
kg(lbs)
L
mm(in.)
mm(in.)
Power supply (phase, cycle, voltage)
Max. current
External finish
Refrigerant control
Compressor
Model
Motor output
Starter type
Protection devices
Crankcase heater
Heat exchanger
Fan Fan(drive) %No.
Fan motor output
Airflow
Defrost method
Noise level
Dimensions
Weight
Refrigerant
Charge
Oil (Model)
Pipe size O.D.
Connection method
Between the indoor &
outdoor unit
Mode
Cooling
Heating
W
D
H
Liquid
Gas
Indoor side
Outdoor side
Height difference
Piping length
Service Ref. PUHZ-HRP71/100VHA2
PUHZ-HRP71/100VHA2R1
PUHZ-HRP71/100VHA
Cooling
52
53
28
Munsell 3Y 7.8/1.1
Linear Expansion Valve
Hermetic
ANB33FJCMT ANB33FJEMT
Inverter
—
Plate fin coil
Propeller fan %2
0.086+0.086 0.074+0.074
100(3,530)
Reverse cycle
950(37-3/8)
330+30(13+1-3/16)
1,350(53-1/8)
120(265)
R410A
5.5(12.1)
1.40(FV50S)
9.52(3/8)
15.88(5/8)
Flared
Flared
Max. 30m
Max. 75m
HeatingCooling Heating
HP switch
LP switch
Discharge thermo
Single 50Hz, 230V
OUTDOOR UNIT
REFRIGERANT PIPING
2.5
51
52
A
kW
W
kW
*
/min(CFM )
dB
dB
mm(in.)
mm(in.)
mm(in.)
kg(lbs)
kg(lbs)
L
mm(in.)
mm(in.)
Power supply (phase, cycle, voltage)
Max. current
External finish
Refrigerant control
Compressor
Model
Motor output
Starter type
Protection devices
Crankcase heater
Heat exchanger
Fan Fan(drive) %No.
Fan motor output
Airflow
Defrost method
Noise level
Dimensions
Weight
Refrigerant
Charge
Oil (Model)
Pipe size O.D.
Connection method
Between the indoor &
outdoor unit
Mode
Cooling
Heating
W
D
H
Liquid
Gas
Indoor side
Outdoor side
Height difference
Piping length
Service Ref. PUHZ-HRP100/125YHA2
PUHZ-HRP100/125YHA2R1
PUHZ-HRP100/125YHA
Cooling
52
53
14
Munsell 3Y 7.8/1.1
Linear Expansion Valve
Hermetic
ANB33FJBMT ANB33FJDMT
2.5
Inverter
—
Plate fin coil
Propeller fan %2
0.086+0.086 0.074+0.074
100(3,530)
Reverse cycle
950(37-3/8)
330+30(13+1-3/16)
1,350(53-1/8)
134(295)
R410A
5.5(12.1)
1.40(FV50S)
9.52(3/8)
15.88(5/8)
Flared
Flared
Max. 30m
Max. 75m
HeatingCooling Heating
HP switch
LP switch
Discharge thermo
3phase, 50Hz, 400V
OUTDOOR UNIT
REFRIGERANT PIPING
51
52
5SPECIFICATIONS

9
6DATA
6-1. REFILLING REFRIGERANT CHARGE (R410A : kg)
6-2. COMPRESSOR TECHNICAL DATA
Piping length (one way)
10m 20m 30m 40m 50m
Factory
charged
5.1
5.1
5.1
5.3
5.3
5.3
5.5
5.5
5.5
6.1
6.1
6.1
6.7
6.7
6.7
60m
7.3
7.3
7.3
75m
7.9
7.9
7.9
5.5
5.5
5.5
Service Ref.
PUHZ-HRP71VHA
PUHZ-HRP71VHA2
PUHZ-HRP71VHA2R1
PUHZ-HRP100VHA(2)
PUHZ-HRP100YHA(2)
PUHZ-HRP100VHA2R1
PUHZ-HRP100YHA2R1
PUHZ-HRP125YHA
PUHZ-HRP125YHA2
PUHZ-HRP125YHA2R1
U-V
U-W
W-V
Service Ref.
Compressor model
Winding
Resistance
()
ANB33FJBMT
(at 20)
0.302
0.302
0.302
PUHZ-HRP100YHA
PUHZ-HRP125YHA
ANB33FJCMT
0.188
0.188
0.188
PUHZ-HRP71VHA
PUHZ-HRP100VHA
U-V
U-W
W-V
Service Ref.
Compressor model
Winding
Resistance
()
ANB33FJDMT
(at 20)
0.302
0.302
0.302
PUHZ-HRP100YHA2
PUHZ-HRP125YHA2
PUHZ-HRP100YHA2R1
PUHZ-HRP125YHA2R1
ANB33FJEMT
0.188
0.188
0.188
PUHZ-HRP71VHA2
PUHZ-HRP100VHA2
PUHZ-HRP71VHA2R1
PUHZ-HRP100VHA2R1
For pipe longer than 30m, additional charge
is required.

10
6-3. NOISE CRITERION CURVES
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)
BAND CENTER FREQUENCIES, Hz
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
PUHZ-HRP71VHA
PUHZ-HRP100VHA
PUHZ-HRP100YHA
PUHZ-HRP125YHA
COOLING
MODE
HEATING
52
SPL(dB)
53
LINE
PUHZ-HRP71VHA2(R1)
PUHZ-HRP100VHA2(R1)
PUHZ-HRP100YHA2(R1)
PUHZ-HRP125YHA2(R1)
1.5m
1m
MICROPHONE
UNIT
GROUND
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
90
80
70
60
50
40
30
20
10
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
BAND CENTER FREQUENCIES, Hz
COOLING
MODE
HEATING
51
SPL(dB)
52
LINE