Hitachi HISCREW 2000 Series User manual

What Marks Say:
INSTRUCTION MANUAL
●This manual expresses the matters that need your attention as below.
●Do not fail to observe “WARNING” and “CAUTION,” as they assume considerable
importance to safety.
: This is a warning.This assumes possible
death or severe injury to the operator if
handled wrongly.
: This is a caution.This assumes possible
injury to the operator and physical
damage, if handled wrongly.
: This means the things that need attention
other than WARNING and CAUTION.
MEMO
WARNING
: This means prohibition.
: This means convenient information
to know.
: This shows reference page number.
: This shows the information specific to
the models with a built-in air dryer.
IMPORTANT
☞
CAUTION
HITACHI ROTARY SCREW COMPRESSOR
Air-Cooled Type,
Before you start operating, be
sure to read this manual carefully
in order to operate the machine
safely and properly.
Also, prepare the manual near
the machine to make it available
at anytime, and refer to it as the
need arises.
Model : OSP-22S5AIOSP-22S5ARI
OSP-22S6AIOSP-22S6ARI
OSP-22
M 5AIOSP-22 M 5ARI
OSP-22
M 6AIOSP-22 M 6ARI
OSP-37S5AIOSP-37S5ARI
OSP-37S6AIOSP-37S6ARI
OSP-37
M 5AIOSP-37 M 5ARI
OSP-37
M 6AIOSP-37 M 6ARI
[Without a built-in air dryer] [With a built-in air dryer]
2000 Series

Characteristics of this Manual
●This manual serves daily operators and maintenance personnel of the compressor as an
instructive materials including its introduction, operation, daily control and periodic ser-
vicing.
●Before installation of the compressor, read the manual carefully and understand its con-
tent and follow the instructions given by it when in use.
Also, prepare the manual near the machine to make it available at anytime, and refer to it
as the need arises.
●If you have anything unclear or any question, please ask your dealer or your nearest
Hitachi regional office.
●It is convenient for ordering spare part, periodic maintenance and overhaul if type and
serial number of the compressor are filled into the back cover of the manual.
■International System of Units (SI):
For the unit of pressure the International System of Units (SI) is used throughout this
manual.To convert it into the conventional system of units, use the following conversion
formula:
7 kgf/cm2= 0.69 MPa or 1 kgf/cm2= 0.098 MPa
■Description of Type
Never remove a protective device from the air compressor or
modify the air compressor.
Never fail to install an earth leakage circuit breaker on the power
cable. It prevents a ground fault burning accident.
Never use the Aas a respiratory appliance by which a
person breathes the compressed air directly.
WARNING
OSP-22S5ARI
Type I(2000 Series)
With a built-in Air Dryer
Air Cooled Type
Frequency (5:50Hz, 6:60Hz)
S: I-Type Control, M: P-Type Control
Output (kW)
Oil Flooded Type
SCREW Type
Package Type
●Hitachi may make improvements and/or changes in the products described in this publication at any time without notice.

1
CONTENTS
1. TO USE IN SAFETY ······························ 2
2.
PARTS DESCRIPTION AND THEIR FUNCTIONS ··· 4
2.1 Appearance ········································ 4
2.2 Main Component Units
and their Functions ··························· 5
3. HOW TO OPERATE······························· 6
3.1 Air Compressor Instrumentation····· 6
3.2 How to Use the Digital Monitor
and its Controls ································· 8
3.3 Initial Start-Up ·································· 10
3.4
Setting of the Control Functions ······ 12
3.5 Daily Operation ································ 15
4. DAILY CHECK······································ 17
4.1 Daily Operation Management········· 17
4.2 Control of Condensate···················· 17
4.3 Lubricant Management ··················· 18
5. TROUBLESHOOTING ························· 20
5.1 When ALARM or SHUTDOWN
is Displayed······································ 20
5.2 Override Operation·························· 21
5.3
SHUTDOWN/ALARM Indications
on the Instrument Panel
····················· 23
5.4
A List of SHUTDOWNS
Not Displayed on Instrument Panel
······· 26
6. SYSTEM OF EACH COMPONENT ····· 28
6.1 Compressed Air/Lubricant System ····· 28
6.2 Capacity Control System················ 29
6.3 Dryer System ··································· 33
7. INSTRUCTIONS FOR INSTALLATION ···· 34
7.1 Verification of Components ··········· 34
7.2 Instructions When Conveying········ 34
7.3 Instructions When Installing ·········· 35
7.4 Instructions When Piping ··············· 36
7.5 Compressor Room Ventilation······· 37
7.6
Instructions on Electrical Wiring ········ 38
8. PERIODIC MAINTENANCE················· 44
8.1 Periodic Maintenance for Compressor ······ 44
8.2 Maintenance Standards (A) ············ 45
8.3 Maintenance Standards (B) ············ 46
8.4 Auto Drain Trap for Dryer ··············· 47
8.5
Performance Check of Relief Valve ······· 48
8.6 Performance Check of
Capacity Control System················ 48
8.7
Replacement of Oil Filter Element ········· 49
8.8 Cleaning and Replacement of
Air Intake Filter Element ················· 50
8.9 Cleaning of Cooler ·························· 51
8.10
Inspection and Replacement of
Minimum Pressure / Check Valve
······· 52
8.11
Replacement of Oil Separator Element ····· 53
8.12 Inspection of Belt ···························· 55
9. WHEN IT IS NOT USED FOR LONG TIME ····· 56
10. PARTS LIST ······································· 57
11. OPERATION RECORD LOGBOOK ··· 67
12. STANDARD SPECIFICATION ··········· 69
DAILY CHECK
INSTALLING ·PLUMBING ·
ELECTRICAL WIRING
PERIODIC MAINTENANCE

2
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1. TO USE IN SAFETY
In order to operate the machine properly and safely, it is indispensable to read care-
fully and follow warnings and instructions hereunder mentioned prior to its use.
The warnings and instructions on labels are attached to the places shown in the figure
below.
WARNING
DETERIORARTED OR FLAMMABLE OIL!
●Replace the oil and the oil separator (element
and housing) regularly as scheduled by the
Instruction Manual. Failure to observe this may
deteriorate the oil and eventually cause a fire
and/or explosion.
●Replace the oil separator (element and
housing) whenever the housing is scratched,
deformed, or corroded. Otherwise, it may be
damaged, ruptured allowing the oil to gush
out, or exploded.
WARNING
CAUTION
WARNING
HOT OIL UNDER PRESSURE!
Do not open the oil-draining valve when the air
compressor is operating. Failure to observe this
may cause the hot pressurized oil to gush and
eventually you may be burnt or injured.
WARNING
WARNING
ROTATING PARTS UNDER
THE INCOMING-AIR LOUVERS!
Keep your hands and any objects away from the
incoming-air louvers because the cooling fan is
underneath.
HOT!
Do not loosen the housing when the air
compressor is operating or immediately after you
have stopped it (that is, the system is still
internally pressurized).Otherwise, the hot
pressurized air and/or oil may gush out and
eventually you may be burnt or injured.
Carefully read the Instruction Manual before
checking or replacing the oil separator.
●Replace the oil separator (element and
housing) whenever the housing is scratched,
deformed, or corroded. Otherwise, it may be
damaged, ruptured allowing the oil to gush
out, or exploded.
●Before checking or replacing the oil separator,
stop the air compressor, disconnect the power,
and make sure that the discharge air pressure
gauge reads 0 (zero) MPa.
●Do not touch the oil separator when it is still
hot. Otherwise, you may be burnt in your
hands.
●Do not use an ordinary filter wrench or pipe
wrench on the market for loosening and
fastening the housing, because such a wrench
may deform or rupture the housing and
eventually the oil may gush out.Instead, use
the Hitachi’s special tool. For further informa-
tion on the special tool, contact a Hitachi’s
distributor.
●Replace the element, housing, and square ring
at the same time.
For further details, read the Instruction Manual.
HOT OIL UNDER PRESSURE!
Do not touch the air compressor when the air
compressor is operating or immediately after you
have stopped it. Failure to observe this may
cause you to be burnt.

3
1. TO USE IN SAFETY
CAUTION
USETHE GENUINE SYNTHETIC OIL ONLY.
●Always use the “NEW AOIL 2000”
(Hitachi’s genuine synthetic oil) for the air
compressor. Do not mix it with any other
brands of oil.
●Replace the oil regularly as scheduled by the
Instruction Manual.
WARNING
WARNING
RESPIRATORY DISEASES!
●Do not use the air compressor for a direct-breath
application. Failure to observe this may cause
hazards (respiratory diseases etc.) as the com-
pressed air from the air compressor contains oil
particles.
●It may also cause hazards to operate the air com-
pressor in a badly ventilated room, tunnel, etc.
WARNING
WARNING
WARNING
WARNING
CAUTION
CAUTION
WARNING
ROTATING PARTS!
●Return any detached cover to its original
place before starting the air compressor.
●Keep your hands and any objects away from
the incoming-air louvers because the cooling
fan is underneath.
●Keep your hands/face and any objects away
from the outgoing-air louvers.
WARNING
ROTATING PARTS!
Keep your hands and any objects away from the
rotating parts (belts, pulleys, etc.).
Be careful on the stopped air compressor in an
automatic stop/restart control because it may
restart without pressing the START button.
HOT OIL OR AIR UNDER PRESSURE!
Before replacing the oil or servicing the air com-
pressor, stop the air compressor, disconnect the
power, and make sure that the discharge air pres-
sure gauge reads 0 (zero) MPa. Be careful on the
oil filling port plug, the relief valve, etc. because
the hot pressurized oil or air may gush from these
parts.
FLAMMABLES!
●Keep a container of the flammable hazards (sol-
vents etc.) away from the air compressor. Fail-
ure to observe this may cause it to explode.
●Do not use any brands of oil other than “NEW
AOIL 2000” (Hitachi’s genuine syn-
thetic oil). Replace the oil and the oil separator
(element and housing) regularly as scheduled
by the Instruction Manual. Failure to observe
these may deteriorate the oil and eventually
cause a fire and/or explosion.
ROTATING PARTS!
●Keep your hands and any objects away from the
rotating parts (pulleys, belts, cooling fans, etc.).
●Be careful on the stopped air compressor in an
automatic stop/restart control because it may
restart without pressing the START button.
LIVE CIRCUITRY!
●Before servicing or wiring the air compressor,
disconnect the power to avoid an electric shock.
Also, put a notice saying ‘Men at Maintenance
Work.Do not turn on the switches.’ on the power
supply, and thereby prevent someone from care-
lessly turning on the switches.
●Askaqualifiedelectrician forwiringand any other
electrical works.
●Ground the air compressor.
FIRE!
●Do not use fire around the air compressor.Oth-
erwise, the sparks from the fire may cause the
air compressor to be internally burnt.
●Do not remove any protective relays on the air
compressor. Also, do not make a modification
of the control circuit that will result in impairing
the protective relay’s function.Otherwise, a fire
may occur and/or the air end may be burnt.
●Install an earth leakage fuse free breaker on
the power supply.
●Check the oil level gauge and verify that the oil
level is between the upper and lower red lines.
HOT!
●Do not touch the air compressor when it is op-
erating or immediately after you have stopped
it, because its components and the oil are hot.
●Keep your hands/face away from the outgoing-
air louvers because the hot air is exhausted from
the louvers.
HOT OIL UNDER PRESSURE!
Before replacing the oil, stop the air compressor,
disconnect the power, and make sure that the
discharge pressure gauge reads 0 (zero) MPa.
Be careful on the stopped air compressor in an
automatic stop/restart control because it may
restart without pressing the START button.

4
Air discharge
Intake air
2. PARTS DESCRIPTION AND THEIR FUNCTIONS
2.1 Appearance
Cooling Air Inlet 1
To suck the ventilating
air for the oil cooler and
aftercooler.
Enclosure
To lower the noise,
sound absorbing mate-
rial is fixed to the inner
surface of the cover.
Instrument Panel
To mount instruments
and switches for the op-
eration (See “3. HOW TO
OPERATE”provision).
Fork Slot
To be used when carry-
ing and installing the
unit. Put the attached
noise-proof covers on
them after installation.
Starter
To be located under the
front door.
Oil Filling Port
To be used when filling
oil into the oil case.
Power Cable Conduit Hole
and External Wiring Port
Be sure to connect the
power cable with care
for the power source
electricity specification
(voltage and frequency).
Discharge Air Outlet
(left hand side)
Compressed air outlet.
A nameplate is attached on the right enclosure panel. It
indicates the Atype (model number), motor out-
put and frequency, working pressure, and manufacturing
number.Inform the Hitachi distributor of such information
whenever asking it to service your A.
IMPORTANT
Cooling Air Outlet
(from air dryer)
To discharge the ventilat-
ingair thathas been heat-
exchanged by the con-
denser.
Cooling Air Outlet
(from air compressor)
To discharge the ventilat-
ingair thathas been heat-
exchanged by the oil
cooler and aftercooler.
Oil Level Gauge
To indicate oil level in
the oil case.
Cooling Air Inlet 2
To suck the ventilating
air for the motor.
Oil Draining Port
To be used when drain-
ing oil from the oil case.
Automatic
Condensate Trap
To automatically drain the
separated condensate.
Note:This illustrates the model with a built-in air dryer.

5
2.2 Main Component Units and their Functions
2. PARTS DESCRIPTION AND THEIR FUNCTIONS [Main Component Units and their Functions]
Air Dryer
This removes the mois-
ture in the compressed
air.
Cooling Fan Motor
Totally enclosed 4-pole
motor is used.
Cooling Fan
Squirrel cage fan is used
for cooling.
Oil Filter
This filtrates impurities
from lubricant.
Oil Separator
This separates lubricant
content from the com-
pressed air.
Minimum Pressure
/ Check Valve
This is found at the oil
separator's outlet and
regulate the minimum
pressure as 0.44 MPa or
over. By this action, the
valve prevent lubricant
from carryover due to in-
creased flow speed at low
pressure.
Air Intake Filter
This prevents foreign
bodies in the air from
being taken in the com-
pressor.
Relief Valve
This unlocks and re-
leases compressed air
when the inner pressure
of the separator abnor-
mally increases.
Oil Level GaugeOil Temperature
Control Valve
This retains the oil tem-
perature at the appropri-
ate level.
Suction Throttle Valve
This controls capacity of
air intake against load
fluctuation.
Driving Unit
This increases the revo-
lution of the main motor
with the help of a pulley
and a V-belt.
Air Discharge Duct
Oil cooler/Aftercooler
Assembly
Oil cooler and Aftercooler
are integrated into an as-
sembled unit, however,
the first cools lubricant
while the second cools
compressed air.
Main Motor
Totally enclosed, exter-
nal-fan cooled 4-pole
motor is used.
Starter
Oil Case
This makes primary
separation of lubricant
content from the com-
pressed air, and its lower
part serves an oil sump.
Note: The figure shows the structure of 22 kW type.

6
ECOMODE
AUTOSTART
運 転
POWER
吐出圧力
電 源
ＳＥＬＥＣＴ
REMOTE
停 止
START
DISCHARGEAIRPRESSURE
警報
SHUTDOWNALARM
ＲＥＳＥＴ
表示切替
１０ｈ ×
リセット
LOAD
故障
Ｃ：温度TEMP
RUNNINGMODE 運転状況 
STOP
RUNNINGCONTROL 運転管理 
ECOMODE
ＥＣＯＭＯＤＥ
起動待ち
遠 方負 荷
エコモード
エコモード
Ｅ：故障コードERRORCODE
ECOMODE
ＤＲＹＥＲ
AUTOSTART
運 転
POWER
電 源
ＳＥＬＥＣＴ
REMOTE
停 止
START
警報
SHUTDOWNALARM
ドライヤー
ＲＥＳＥＴ
表示切替
１０ｈ ×
リセット
LOAD
故障
Ｃ：温度TEMP
RUNNINGMODE 運転状況 
STOP
RUNNINGCONTROL 運転管理 
ECOMODE
ＥＣＯＭＯＤＥ
起動待ち
遠 方負 荷
エコモード
エコモード
Ｅ：故障コードERRORCODE
ＤＲＹＥＲ
ドライヤー
MPa
01.5
0.5 1
Available only to the models
with a built-in air dryer
Digital Monitor
The screen displays the running hours,
discharge air temperatures, loading data,
and shutdown/alarm codes. The ALARM
and SHUTDOWN lights indicate that a
problem has happened.
AUTO START Light (green)
・For the M-type Awith ‘A’mode capacity control (☞p.29):
Becomes on (non-flashing) when in an automatic stop state and on
(flashing) when in an automatic restart state. It also becomes on
(flashing) when the instantaneously interrupted power is recovered.
・For the models with a built-in air dryer: Flashes for 3 minutes after
the air dryer prestarts.
START Light (Red)
glows when the unit is in oper-
ation as well as in automatic
restart status.
POWER Light (Yellow)
glows when main power is
supplied.
START Button
press this button when
to start the unit.
STOP Button
press this button when
to stop the unit.
Discharge Air Pressure Gauge
indicates the pressure of discharge air.
Running Mode Lights
The LOAD, REMOTE,
ECOMODE, and AUTO
START lights indicate an
operation mode.
3. HOW TO OPERATE
3.1 Air Compressor Instrumentation
Buttons/Lights
for Operation

7
DRYER
ドライヤー
エコモード
AUTOSTART
起動待ち
SELECT
REMOTE
警報
SHUTDOWNALARM
RESET
表示切替
遠 方
10h×
リセット
LOAD
負 荷
故障
C：温度 TEMP
運転状況 RUNNINGMODE
RUNNINGCONTROL 運転管理
ECOMODE
ECOMODE
エコモード
Ｅ：故障コード ERRORCODE
DRYER
ドライヤー
エコモード
AUTOSTART
起動待ち
SELECT
REMOTE
警報
SHUTDOWNALARM
RESET
表示切替
遠 方
10h×
リセット
LOAD
負 荷
故障
C：温度 TEMP
運転状況 RUNNINGMODE
RUNNINGCONTROL 運転管理
ECOMODE
ECOMODE
エコモード
Ｅ：故障コード ERRORCODE
RESET+ECOMODE Buttons
Hold down the RESET button and press
the ECOMODE button to toggle between a
remote operation and a local operation
(
☞
p.13). Refer to the IMPORTANT (1).
LOAD Light (yellow)
Becomes on (non-flashing)
when the Ais load-
ing under the standard I type
capacity control. Refer to the
IMPORTANT (3).
SELECT Button
Press the SELECT button to
display some operating data
and shutdown/alarm codes
on the digital monitor (
☞
p.
8).
ALARM Light (red)
Becomes on (flashing) when an alarming prob-
lem arises. At the same time the digital monitor
displays a corresponding alarm code. Refer to
the IMPORTANT (1).
SHUTDOWN Light (red)
Becomes on (flashing) when a shutdown
problem arises. At the same time the digi-
tal monitor displays a corresponding shut-
down code. Refer to the IMPORTANT (1).
RESET Button
Releases a self-hold circuit made
when an alarm/shutdown problem
arose (
☞
pp. 23-24).
Digital Monitor
Displays an alarm/shutdown code
when a corresponding light becomes
on (flashing) (
☞
pp. 23-24). Refer to
the IMPORTANT (2).
DRYER Button & Light (red)
Under manual operation mode for the built-in
air dryer, press the DRYER button to manual-
ly start and stop it. Under any operation
modes for the built-in air dryer, the DRYER
light becomes on (non-flashing and flashing)
when it is operating respectively normally and
abnormally. Refer to the IMPORTANT (2).
REMOTE Light (green)
Becomes on (flashing or non-
flashing) when a remote oper-
ation is enabled.
ECOMODE Button and Light (yellow)
Press the ECOMODE button to enable an
ECOMODE function that temporarily reduces the
cutout pressures. The ECOMODE light becomes
on (non-flashing and flashing) when this function is
respectively enabled and activated.
3. HOW TO OPERATE [Air Compressor Instrumentation]
Buttons/Lights
for Control
Buttons/Lights for
Shutdown and
Alarm Indication
(1) If you want to permanently enable a
remote operation with the REMOTE
light on (non-flashing), place the DIP
switch SW1 No. 4 in an on position. If
you want to use an external setting
switch for enabling/disabling a remote
operation with the REMOTE light on
(flashing), connect the wires between
the external setting switch and the
starter/control box. For more informa-
tion, see page 13.
(2) Before shipping the models with a
built-in air dryer, Hitachi presets its op-
eration mode to automatic.If you want
to enable manual operation mode,
change the settings of the DIP switch
SW2 No.1 & 2.For more information,
see page 14.
Before disconnecting the power from
the Aunder manual opera-
tion mode, press the DRYER button
to manually stop the built-in air dryer.
If you disconnect the power before
manually stopping the built-in air dryer,
it restarts as soon as you reconnect
the power, that is, you cannot manu-
ally prestart it before starting the air
compressor.
(3) The LOAD light becomes on (flashing)
when the Ais loading under
the alternative Itype capacity control.
For more information, see page 32.
(1) The digital monitor displays a dis-
charge air temperature, instead of
the alarm/shutdown code, when
the alarm/shutdown light be-
comes on (flashing) due to high
or abnormally high discharge air
temperature.
(2) At the same time the DRYER light
becomes on (flashing) when the
built-in air dryer causes an alarm/
shutdown problem (☞p.
25).
IMPORTANT
IMPORTANT
Remote and local operation means starting
and stopping the Arespectively:
with external control signals from other than
the built-in starter/control box and
with the START and STOP buttons on the
built-in instrument panel.

8
DRYER
ドライヤー
エコモード
SELECT
警報
SHUTDOWNALARM
RESET
表示切替
10h×
リセット
故障
C：温度 TEMP
RUNNINGCONTROL 運転管理
ECOMODE
Ｅ：故障コード ERRORCODE
OperatingHours(×10h)
Dot:Indicatesupdatingoftheoperatinghours.
P:PressureinMPa(Unused.)
C:DischargeairtemperatureinCelsius
L:Loadingrateinpercent
U:Totalloadingtime(×10,000)
E:Alarm/shutdowncode
Holddownformore
than3seconds.
Holddownformore
than7seconds.
Holddownformore
than3seconds.
Holddownformore
than3seconds.
Pressto
return.
SELECT
表示切替
SELECT
表示切替
Pressforeachnewscreen.
SELECT
表示切替
Press
SELECT
表示切替
SELECT
表示切替
SELECT
表示切替
RESET
リセット
押す
(Availableonlywhenanalarm/shutdown
problemhashappened.)
DigitalMonitor
Newestshutdown
Secondnewest
shutdown
Oldestshutdown
XX:Shutdowncode
Nottobeused
bytheusers.
F3andthefurthernumbers
3.2 How to Use the Digital Monitor and its Controls
(1) Displaying the Operating Hours, Pressure, Discharge Air Temperature,
Loading Rate, Total Loading Time, and Alarm or Shutdown Code
3. HOW TO OPERATE [How to Use Digital Monitor and its Controls]
When you connect the power, the digital monitor displays the
total operating hours. To display other data, do as follows:
qPress the SELECT button. The screen displays “P0.00.”
This screen is unused.
wPress the SELECT button. The screen displays “C”
together with the discharge air temperature.
ePress the SELECT button. The screen displays “L”
together with the loading rate. The system flushes
figures when in calculation.
rPress the SELECT button. The screen displays “U”
together with the total loading time (×10,000).
Refer to the IMPORTANT.
tPress the SELECT button. When the alarm/shutdown
light is:
・on (flashing), the screen displays “E” (flashing)
together with the alarm/shutdown code (☞pp.
23-24). Press the SELECT button to return to the
original screen of total operating hours.
・off, you directly return to the original screen of
total operating hours.
To display other data, do as follows:
qHold down the SELECT button. The screen displays
“F0” together with the shutdown code (☞pp. 23-24).
The “0” indicates the newest shutdown.
wPress the SELECT button. The screen displays “F1”
together with the shutdown code. The “1” indicates the
second newest shutdown.
ePress the SELECT button. The screen displays “F2”
together with the shutdown code. The “2” indicates the
oldest shutdown.
rPress the RESET button. The screen returns to what
you have left with the action qabove. If you press the
SELECT button instead, the screen displays “F3” (and
the further numbers) which are not to be used by the
users.
Displaying the “”in the action qindicates that no shut-
downs are stored in the memory.
IMPORTANT
(2) Displaying the Shutdown History
If you want to display the exact total loading
time (×10), hold down the SELECT button
and press the RESET button.
IMPORTANT

9
X Flashing:
Changeable
Cutoff Pressure Screen
(an example)
No.0: Capacity Control Mode
L: I-type control
No.1: Cutoff Pressure
069: 0.69 MPa
Hold down the RESET button
and press the SELECT button
more than 3 times.
Hold down the SELECT button
and press the RESET button.
No.2: Cutin Pressure
059: 0.59 MPa
No.3: Pressure Differential
008: 0.08 MPa (unused)
No.4: Reference Time for
Shifting to ECOMODE Function
030: 30 seconds
No.5: Alternative Cutoff
Pressure
069: 0.69 MPa
No.6: Alternative Cutin
Pressure
059: 0.59 MPa
SELECT
表示切替
RESET
リセット
RESET
リセット
SELECT
表示切替
RESET
リセット
SELECT
表示切替
SELECT
表示切替
RESET
リセット
Press.
Press for
each new screen.
SELECT
表示切替
Press to return.
Press.
Go to the
section (4)
Changing
the
Capacity
Control
Settings.
DigitalMonitor
5 seconds later, a
changeable decimal
place automatically
shifts.
Move to
the cutin
pressure
screen.
Press the SELECT
button to change
the cutoff pressure
setting.
3. HOW TO OPERATE [How to Use Digital Monitor and its Controls]
(3) Displaying the Capacity Control Settings
(4) Changing the Capacity Control Settings
To change the capacity control settings, do as follows:
qDisplay the cutoff pressure screen.
wHold down the SELECT button and press the RESET
button.The first decimal place of the current cutoff pres-
sure setting flashes to indicate that it is changeable.
ePress the SELECT button as many times as required
until a desired number is displayed.
rFive seconds later, the first decimal place stops flash-
ing and the second decimal place flashes. Press the
SELECT button as many times as required until a
desired number is displayed.
tPress the RESET button to return to the cutoff pres-
sure screen.
yPress the SELECT button to move to the cutin pres-
sure screen. Repeat the above actions wthrough r
to change the cutin pressure setting. Press the RE-
SET button. The screen returns to what you have left
with the action qabove.
To display the capacity control settings, do as
follows:
qHold down the RESET button and press the
SELECT button more than 3 times. The screen
displays “0.L＊＊”as an example (see the IMPOR-
TANT below).
wPress for each new screen to display the standard
and alternative cutoff and cutin pressures and the
reference time for shifting to ECOMODE control.
ePress the RESET button. The screen returns to
what you have left with the action qabove.
The first screen displays the capacity control mode
symbols: A, L, or U. Each mode consists of the capac-
ity control types as follows:
A: U+I+P Type
L: U+IType
U: U Type
The first screen also displays the “＊＊”that may vary
depending on the specifications.
IMPORTANT
1. Do not change the reference time for shifting to
ECOMODE control. See page 31.
2. To enable the alternative cutoff/cutin pressure func-
tion, turn on the external switch that you installed
to enable/disable this function.
IMPORTANT
Follow the section (3) Displaying the Capacity Control Settings
to display the screen where you want to change the setting.
ASpecifications 0.69MPa 0.83MPa 0.92MPa Remark
StandardCutoffPressure １． 069 083 092
StandardCutinPressure ２． 059 074 082
PressureDifferential ３． 008 008 008
４． 030 030 030
AlternativeCutoffPressure ５． 069 083 092
AlternativeCutinPressure ６． 059 074 082
Standard Factory Settings (in MPa without decimal point)
Unused.
Donot
change.
Available
asan
option.
ReferenceTimeforShifting
toECOMODEControl
Hitachi presets the standard cutoff pressure to the cor-
responding specification pressure.Always set the cut-
off and cutin pressures to between 050 and the speci-
fication pressure 069, 083, or 092.
IMPORTANT

10
qBe sure the power is OFF.
wBe sure that grounding is firmly connected.
eBe sure the discharge pressure gauge indicates 0.
rDetach the door (for the 22 kW models) or the
front enclosure panel (for the 37 kW models)
and remove the starter/control box cover.
Make sure that the DIP switches SW1 and
SW2 on the printed circuit board are correctly
set. (☞pp.
12-14)
tCheck if oil level is kept around the upper red
line on the oil level gauge.
(Oil level lowers while operation)
3.3 Initial Start-Up
3. HOW TO OPERATE [Initial Start-Up]
3.3.1 Before power on
Every button such as START, STOP and RESET will
not function unless the switch held down more than 0.3
second.
After the installation, or after long unused time (over a week),
run the machine by way of initial start-up.
Capacity control of S-type is preset to I-type control,
and M-type is to P-type (AUTO) control.
Refer to page 12 for the setting of control function when
the control type is changed.
Compressor shifts repeatedly between full-load and no-
load operation within the range of its discharge pres-
sure between 0.69 MPa and 0.59 MPa.
Before turn the power ON, make sure if
zinstallation, xpiping and celectrical wir-
ing have been properly completed.
CAUTION
Oil has been filled in the oil case by the
factory before delibery.
CAUTION
qConnect the power.
wSee if POWER light glows on the compressor’s
instrument panel.
eDigital monitor displays run hour in 10 hours
as a unit.
rFully open the valve on discharge side.
For safety, the unit will not operate for 5 seconds after
the power is ON, even START button is pressed.
3.3.2 Power on
IMPORTANT
IMPORTANT
IMPORTANT
⑤
②
④
③ ①
Power
Supply
③② ①
④ Power
Supply

11
qPress the START button.
wSTART light glows and the compressor starts.
eGradually closing the discharge side valve,
and keep running-in of the machine at the dis-
charge pressure of 0.49-0.59 MPa for an hour.
rBe sure that the oil level is kept between two
red lines during operation.
tPress the SELECT button on the instrument
panel to display the discharge air tempera-
ture. Make sure that it is stable between 65°C
and 100°C.
yMake sure that, 5 to 10 minutes after starting,
the refrigerant pressure gauge reads 0.41 to
0.73 MPa.
uMake sure that, about 20 minutes after start-
ing, the automatic condensate trap starts drain-
ing the condensate.
3. HOW TO OPERATE [Initial Start-Up]
3.3.3 Operation
3.3.4 Stop
qPress the STOP button.
The compressor stops.
wBe sure that the pressure at DISCHARGE AIR
PRESSURE GAUGE indicates 0 (It returns to
0 for about 1 or 2 minutes after stop.)
eFully close the valve on discharge side.
rDisconnect the power.
⑤ ①②
⑦
⑥
③
④
②① ④
③ Power
Supply

12
3.4.1 Setting of Capacity Control Mode
As listed in the table below:
・The S- and M-type As provide two ca-
pacity control modes each.
・You can select either one of them by setting the
No. 3 & 4 pins of the DIP switch SW2 located
on the printed circuit board.
3. HOW TO OPERATE [Setting of the Control Functions]
3.4 Setting of the Control Functions
When you use an external air dryer under the ‘A’mode
of capacity control (U-type + I-type + P-type), enable it
to keep operating even when the Aautomati-
cally stops.Thus protect the external air dryer from stop-
ping and restating frequently.
For more information on the capacity control sys-
tem, see pages 29 through 30.
IMPORTANT
Do not select the U-type when your Aspecifies
the discharge of 0.92 MPa.
IMPORTANT
NOTES:
1. The shaded cells indicate a standard factory setting.
2. The + mark indicates that the CPU automatically selects
either of the 2 or 3 capacity control types whichever is
appropriate.
3. Do not set the SW2 No.3 & 4 to other than the above.
3.4.2 How to Set Capacity Control Type
to U
qDisconnect the power.
wRemove the starter/control box cover.
ePlace the No. 4 pin of the DIP switch SW2 in
an off position.
rReturn the starter/control box cover to its origi-
nal place.
tReconnect the power.
yDisplay the capacity control setting screen on
the digital monitor (☞p. 9). Make sure that
the Uas 0.U** is displayed.
UMode LMode AMode LMode
(U Type) (U+IType)
(U+I+P Type) (U+IType)
No.3 ON ON ON ON
No.4 OFF ON OFF ON
0.U＊＊ 0.L＊＊ 0.A＊＊ 0.L＊＊
AType S-type M-type
Settings of
DIP Switch
SW2
Capacity Control
System
Display on Digital Monitor
②
④
⑥ ①⑤
Power
Supply
16
CN16
51
CN17
41
CN8
21
CN2
19
CN1
17
CN15
17
Y3 Y1Y1
CPU
Y52C
Y2D
Y52
CN13
13
CN3
15
CN5
17
CN4
17
CN6
15
CN14
41
Y42
Y6
C38
C4D
C39
ICO
GND
CN11 CN12
14
CN18
13
CN19
13
CN22
14
CN21
15 12
CN10
1
18
2
CN9
SW1
14
SW2
CN7
HC30CPU−
SW2
14
ON
OFF
DIPSwitch
PrintedCircuitBoard
DRYER
ドライヤー
エコモード
SELECT
警報
SHUTDOWNALARM
RESET
表示切替
10h×
リセット
故障
C：温度 TEMP
RUNNINGCONTROL 運転管理
ECOMODE
Ｅ：故障コード ERRORCODE
⑥


13
・When you disable a remote operation, always use
the method used when in enabling. If you enabled it
with the method (2) or (3), for example, you cannot
disable it with the method (1).
・You can stop the remotely started Aeven
by pressing the STOP button on the A’s in-
strument panel.
・As an optional function, you can externally output the
remote operation setting signal.
3. HOW TO OPERATE [Setting of the Control Functions]
IMPORTANT
3.4.3 Enabling the Remote Operation
The following 3 methods (1), (2), and (3) are avail-
able to enable the remote operation. Usually em-
ploy the method (1).
Method (1): On the A’s Instrument Panel
aConnect the power.
bHold down the RESET button and press the
ECOMODE button.
cMake sure that the REMOTE light is on to indi-
cate a remote operation enabled.
dTo disable the remote operation, hold down the
RESET button and press the ECOMODE button.
Make sure that the REMOTE light is off to indi-
cate a remote operation disabled or a local opera-
tion enabled.
Method (2): On the Starter
qDisconnect the power.
wRemove the starter/control box cover.
eConnect the wires between the A’s starter/
control box and an external control panel. For in-
formation on a wiring diagram, see pages 40
through 43.
rPlace the No. 4 pin of the DIP switch SW1 (on the
printed circuit board) in an on position.
tReturn the starter/control box cover to its original
place.
yReconnect the power.
uMake sure that the REMOTE light is on to indi-
cate a remote operation enabled.
With this method, usually, you may intend to permanently
use a remote operation.If you want to disable it for some
reason, you need to place the No.4 pin of the DIP switch
SW1 in an off position.
Method (3): On an External Setting Switch
qDisconnect the power.
wRemove the starter/control box cover.
eConnect the wires:
between the A’s starter/control box and an
external control panel, and
between the A’s starter/control box and the
external setting switch.
For information on a wiring diagram, see pages 40
through 43.
rMake sure that the No. 4 pin of the DIP switch
SW1 (on the printed circuit board) is in an off posi-
tion.
tReturn the starter/control box cover to its original
place.
yReconnect the power.
uTurn on the external setting switch.
iMake sure that the REMOTE light flashes to indi-
cate a remote operation enabled.
oTo disable the remote operation, turn off the ex-
ternal setting switch. Make sure that the REMOTE
light is off to indicate a remote operation disabled
or a local operation enabled.
IMPORTANT
AUTOSTART
起動待ち
REMOTE
遠 方
RUNNINGMODE
(1) To enable the remote operation
on the A’s instrument panel:
Hold down the RESET button
and press the ECOMODE button.
ECOMODE
エコモード
RESET
リセット
b
Action of
REMOTE Light
ON (not flashing)
ON (not flashing)
ON (flashing)
OFF
Enabled
Disabled
Method (1):
on the instrument panel
Method (2):
on the starter
Method (3):
with an external setting switch
Remote Operation
cd （2）⑦ （3）⑧⑨
②③
⑤
①
⑥
a
Power
Supply
16
CN16
51
CN17
41
CN8
21
CN2
19
CN1
17
CN15
17
Y3 Y1Y1
CPU
Y52C
Y2D
Y52
CN13
13
CN3
15
CN5
17
CN4
17
CN6
15
CN14
41
Y42
Y6
C38
C4D
C39
ICO
GND
CN11 CN12
14
CN18
13
CN19
13
CN22
14
CN21
15 12
CN10
1
18
2
CN9
SW1
14
SW2
CN7
HC30CPU−
SW1
ON
OFF
ON
OFF
DIPSwitch
PrintedCircuitBoard
（2）④
（3）④
Settingof
RemoteOperation
1234
4
5〜8
CAUTION
SettingofRemote
Operationwiththe
ExternalSettingSwitch
Except when you proceed to
an override operation, do not
change the standard factory
settings for the No.5 to 8 pins.
Otherwise, a proper control al-
gorithm is lost.

14
3. HOW TO OPERATE [Setting of the Control Functions]
When the power is instantaneously interrupted and then
uninterrupted, the air compressor and the air dryer start
simultaneously.
IMPORTANT
When you use an external automatic control
panel
(multiple-unit controller, two-unit controller, etc.) :
・Set the DIP switch SW2 No.1 & 2 to ON & ON
respectively (to enable the manual mode), and
the DIP switch SW1 No.1 to OFF (to disable
the air dryer prestart function).
Thus you can protect the air dryer from stopping
and restating frequently.
CAUTION
3.4.4 Setting of Air Dryer
(1) Operation Modes
As listed in the table left, the models with a built-in
air dryer provide 3 operation modes. You can select
either one of them by setting the No. 1 & 2 pins of the
DIP switch SW2 located on the printed circuit board.
If you want to enable an air dryer prestart function,
always select the automatic mode.
If you want to start and stop the built-in air dryer with
the DRYER button, always select the manual mode.
The settings are saved in the memory when you have
stopped the A.
(2) Air Dryer Prestarting
To enable the air dryer prestart function, set:
DIP switch SW2 No.1 & 2 to ON & OFF respec-
tively, and
DIP switch SW1 No.1 to ON.
When you press the START button under the air dryer
prestart function,
・The START light and DRYER light become on (non-
flashing),
・The AUTO START light becomes on (flashing), and
・The air dryer prestarts.
Three minutes later,
・The AUTO START light becomes off, and
・The air compressor automatically starts.
This chills the built-in air dryer sufficiently in advance,
and thus enables to discharge the dry compressed air
from the beginning.
NOTE:The shaded cells indicate a standard factory setting.
This page describes for the models with a
built-in air dryer.
No.1 OFF OFF ON ON
No.2 OFF ON OFF ON
–
Independent Automatic Manual
DRYER Light OFF
Without
Built-in
Air Dryer With Built-in Air Dryer
DIP Switch
SW2
Air Dryer
Operation Mode
(by connecting
& disconnect-
ing the power)
(by START
and STOP
buttons)
(by DRYER
button)
ON (non-flashing) for normal operation
ON (flashing) for abnormal operation
AModels
16
CN16
51
CN17
41
CN8
21
CN2
19
CN1
17
CN15
17
Y3 Y1Y1
CPU
Y52C
Y2D
Y52
CN13
13
CN3
15
CN5
17
CN4
17
CN6
15
CN14
41
Y42
Y6
C38
C4D
C39
ICO
GND
CN11 CN12
14
CN18
13
CN19
13
CN22
14
CN21
15 12
CN10
1
18
2
CN9
SW1
14
SW2
CN7
HC30CPU−
SW1
ON
OFF
DIPSwitch
③
12
2
AirDryerAlarming
AirDryerShutdown
OperationMode
(indicatestheautomaticmode
.)
ON
OFF
AirDryerPrestarting
SW2
14
ON
OFF
DIPSwitch
PrintedCircuitBoard
②
④
①
Power
Supply
(3) Air Dryer Warning (Shutdown/Alarm)
To enable the air dryer warning function, set the DIP
switch SW1 No.2 to:
ON for an alarm, and
OFF for a shutdown.
When the air dryer fails,
・The SHUTDOWN or ALARM light becomes on
(flashing),
・The DRYER light begins flashing, and
・The digital monitor displays the shutdown or alarm
code.
When the SHUTDOWN light flashes, the air compres-
sor is automatically shut down.When the ALARM light
flashes, the air compressor is not shut down but keeps
operating. In either case, usually, the air dryer is shut
down.
(4) Setting Procedure
When setting the DIP switches SW1 and SW2:
qDisconnect the power.
wDetach the door (for the 22 kW models) or the front
enclosure panel (for the 37 kW models), and then
remove the starter/control box cover.
eSet the DIP switches SW1 and SW2 as required.
rReturn the door or front enclosure panel and the
starter/control box cover to their original places.

15
qCheck if oil level is kept within the range be-
tween upper and lower red lines. However,
since the oil level may lower a little while op-
eration of the unit, check again the level when
the unit is in operation.
3. HOW TO OPERATE [Daily Operation]
3.5 Daily Operation
3.5.1 Before power on
3.5.2 Power on qConnect the power.
wPOWER light on the instrument panel glows.
eFully open the valve on discharge side.
rFully open the valve for the condensate drain
trap.
●Do not operate the machine with the pressure excess of its rated pressure. Excessive pressure gives
overload to the motor and may damage some parts or even cause SHUTDOWN of the compressor.
●Investigate the cause and take necessary measures when the Relief Valve functions or the compres-
sor stops by other safety device. Ask your dealer or your nearest Hitachi Service Station if there is
any question.
●When the Aautomatically stops and restarts frequently, or the ambient temperature and
humidity are high, open the oil/condensate drain valve of the oil case to drain the condensate from
time to time. If you do not observe this instruction, the air end (rotors, bearings, etc.) and the compo-
nents rust internally to cause a failure and/or the oil deteriorates. For more information, see page 17.
CAUTION
Oil Level Gauge
Upper
red line
Lower
level line
Oil Filling
Port
Front
Door
④
② ①
③
Power
Supply

16
qPress the START button.
Make sure that the air compressor starts.
・
For the air dryer prestarting (
☞
p. 14) disabled:
Make sure that the built-in air dryer starts
simultaneously.
・For the air dryer prestarting enabled:
Make sure that the built-in air dryer prestarts,
the AUTO START light flashes for 3 minutes,
and then the air compressor starts.
wMake sure that the oil level during operation
is kept within the range between the red lines.
eIf it is below the lower line, follow the proce-
dure on page 18 and replenish the genuine
synthetic oil (NEW AOIL 2000).
rDigital monitor displays run hour in 10 hours
as a unit.
Press the SELECT button on the instrument
panel and check if the discharge temperature
is within the range between 65°C and 100°C.
(After temperature stabled)
tMake sure that, 5 to 10 minutes after starting,
the refrigerant pressure gauge reads 0.41 to
0.73 MPa.
yMake sure that, about 20 minutes after start-
ing, the automatic condensate trap starts drain-
ing the condensate.
3. HOW TO OPERATE [Daily Operation]
3.5.3 Operation
3.5.4 Stop
qPress the STOP button.
The compressor stops.
wBe sure that the pressure at DISCHARGE AIR
PRESSURE GAUGE indicates 0 (It returns to
0 for about 1 or 2 minutes after stop.)
eFully close the valve on discharge side.
rDisconnect the power.
④ ①
⑥
⑤
②
②① ④
③ Power
Supply

17
4. DAILY CHECK
Record the operation status of the day in OPERA-
TION RECORD LOGBOOK (☞p.
67). Mainte-
nance must be carried out if checked values show
excess over allowable criteria.
4.2 Control of Condensate
The oil temperature control valve controls the oil
temperature and thus prevents the condensate
from being produced in the oil case under the nor-
mal operating conditions.
Under the following operating conditions, however,
the condensate may be produced in the oil case.
1. The ambient temperature and relative humidity is
as high as:
30°C and more than 80%, and
40°C and more than 50%.
2. The Astops and restarts repeatedly.
3. The oil cooler cools the oil excessively.
If this is the case, open the oil draining valve and
check if the condensate comes out. Drain the con-
densate as required.
Draining the Condensate before Starting
the A
qMake sure that the Ais not operating
and the discharge pressure gauge reads 0 MPa.
wClose, and then unplug, the oil-draining valve
on the pipe extended from the oil case.
ePlace the oil pan under the oil-draining valve.
rOpen the oil-draining valve.
tThe oil comes out and the condensate follows.
yWhen the oil starts to come out again, close and
plug the oil-draining valve.
If the condensate is not discriminable from the lubricant,
check its viscosity by your finger tips while draining. Be
sure the condensate is well cooled before touching it. If
the condensate sticks to your fingers, the lubricant is
coming out.
4.1 Daily Operation Management
●Running the compressor for long time
without draining may cause not only
troubles to the Rotor and Bearings in its
air end, but other majour troubles like
rusting inside equipments.
●In case of multiple unit operation, it is rec-
ommended to attach an oil cleaner to the
unit. Ask your dealer or Hitachi’s service
station for this information.
●Do not open the oil-draining valve when
the Ais operating. Otherwise the
hot oil gushes out and you may be injured
or burnt.
CAUTION
1. Before check and maintenance of the compressor, carefully read “TO USE IN SAFETY” (☞p. 2)
again.
2. Be sure to turn OFF the POWER when check or maintenance is carried out.
3. Never touch rotating parts of the compressor (Motor Shaft, M-Sheave, V-Pulley, V-Belt and Cooling
Fan).
WARNING
IMPORTANT
Take this
plug out.
Saucer
(
Furnished b
y
user
)

18
4.3 Lubricant Management
4. DAILY CHECK [Lubricant Management]
1. When deteriorated lubricant is used without replacement, some of it adhere to the Oil Separator Ele-
ment and accumulate heat caused by its oxidization. This may bring even fire in the worst case.
2. Change lubricant and Oil Separator Element constantly according to the standard given by the Main-
tenance Standard (☞pp.
45-46). Deteriorated Lubricant may result fire to the Oil Separator.
3. Use genuine synthetic oil (NEW AOIL 2000) for lubricant. Avoid use of other brand or mix use
with it.
WARNING
4.3.1 Oil level check
Check lubricant level by the oil level gauge on the
oil case while the unit is working (loaded opera-
tion).
It is normal if the level is kept between two red
lines.
The level over the upper line is too much. Stop
the compressor and after check of no residual
pressure is left inside, discharge off the surplus
from the valve at oil case drain port.
If the level is lower than the lower red line, it is in
short. Stop the compressor and after check of no
residual pressure left inside, turn OFF the power
and replenish some more of lubricant.
Ask your dealer or Hitachi’s service station for replace-
ment of the genuine synthetic oil (
NEW AOIL 2000 ).
4 liters oil can: Part No. 330
20 liters oil can: Part No. 332
The genuine synthetic oil may get darkened due to its
chemical additives soon after start of use, but it is not
abnormal.
CAUTION
●Replenish the oil (genuine synthetic oil) periodically to
maintain the proper oil level. Long time operation without
the oil replenishment at low oil level, can cause the shorter
oil life or oil deterioration.
●Oil replenishment shall be carried out every 1500 to 2000
operating hours. Replenish amount might be;
2 to 3 liters for 22 kW, and 3 to 4 liters for 37 kW.
(Actual replenish amount shall be determined by the oil
level, as it is varied by the load rate of the compressor.)
●Sampling analysis of the oil at every 3000 hours interval is
recommended. Earlier oil replacement might be neces-
sary, depending on the result of the analysis.
Consult HITACHI dealer for the sampling analysis.
1.7 liters
(0.34 liters / 1cm)
8 liters
2.6 liters
(0.51 liters / 1cm)
13 liters
OSP-22SA(R)I
OSP-22MA(R)IOSP-37SA(R)I OSP-37MA(R)I
Type
Item
Oil level
between
red lines
Oil replacement
quantity
IMPORTANT
Oil Level Gauge
Upper
red line
Lower
level line