Anest Iwata OFB-1 User manual

INSTRUCTION MANUAL
OIL-FREE PISTON BASE MOUNT AIR
COMPRESSOR
OFB-1/2/3/5/7.5/10/15
OFB-7.5H/10H/15H
Thank you for purchasing our oil-free scroll air compressor.
●Before operation, be sure to read this instruction manual thoroughly for safe
and efficient use for a long operating lifetime.
●After reading it, store in a convenient place for immediate and future
reading.
Before use, be sure to fill in the blank spaces below for future repair and after service.
MODEL
SERIAL No.
Purchased from
Date of purchase
Date of use

1
Important information-Safety precautions
▪Important information
Be sure to read and understand this instruction manual.
The operator shall be fully conversant with the requirements stated within this instruction manual including important
warnings, cautions and operation.
The marks and symbols have the following meanings.
•Indications of warnings and cautions
WARNING
Indicates a potentially hazardous situation which, if not avoided, will result in
serious injury or loss of life.
CAUTION
Indicates a potentially hazardous situation which, if not avoided, may result
in minor or moderate injury or property damage.
•Examples of warnings and cautions
Indicates「You must be careful」. We will explain briefly in or near the symbol.
（The example on the left is [Be careful about electric shock]）
Indicates「You must not do」. We will explain briefly in or near the symbol.
（The example on the left is [Do not touch]）.
Indicates 「You must do」. We will explain briefly in or near the symbol.
（The example on the left is [Be sure to ground it]）.
＊We shall not be responsible for any injury or damage caused by disregard of warnings, cautions or instruction.
Keep this booklet in an appropriate place for immediate reference.

2
Important information-Safety precautions
▪Safety precautions
WARNING
Install in a safe area.
Install in an area which is free of volatile, flammable gases or organic solvents.
They can cause explosion or fire.
Never install outdoors.
Do not install outdoors (This compressor is not water-proof)
If water splashes on electric equipment, it can cause electric shock or fire.
Turn off main electric source.
Be sure to turn off main electric source before inspection or wiring unit.
If not, it can cause electric shock or serious bodily injury.
Ask qualified electrician.
Ask qualified electrician to perform electric wiring job.
If not, it can cause electric shock or fire.
Be sure to ground.
Be sure to do the grounding job.
If not, it can cause electric shock or fire.
Never use to compress anything other than air.
If done, it can cause explosion, fire or damage.
Never use with respiratory equipment which
directly intakes compressed air.
If done, it can cause serious bodily injury.

3
Important information-Safety precautions
WARNING
Never use with equipment which is directly
concerned with human life.
If done, it can cause serious bodily injury.
Never touch
Never touch turning parts (fan, pulley and belts) while main electric source is turned on.
If done, it can cause serious injury including entanglement of fingers or hands.
Release pressure
Be sure to release pressure from air receiver and make sure there is no pressure inside before
conducting any maintenance or inspection.
If not, parts can scatter and can cause serious injury.
Conduct maintenance and inspection
Conduct maintenance and inspection according to maintenance standards.
If not, it can cause fire and failure.

4
Important information-Safety precautions
CAUTION
Use at ambient temperature of 36 degree F to 104
degree F
Drain will freeze at less than 36 degree F and cause failure.
More than 104 degree F will cause shorter lifetime or damage to unit.
Use in an area which is free of dirt or dust.
If done, it can cause failure.
Use at an area which is free of corrosive gas.
If done, it can cause failure.
Ask specialist to perform repairs.
If not, it can cause failure and shorter lifespan.
Never touch.
Never touch each section of compressor during operation or soon after operation.
If done, it can cause burns.
Never alter the compressor.
If done, it can cause damage or shorter lifespan.
Use genuine parts.
Be sure to use our genuine parts when replacing parts during maintenance.
If not, it can cause failure or shorter lifespan.

5
Contents
Important information-Safety precautions
Appendix
▪Important information ------------------------------1
▪Safety precautions------------------------------------2
▪Outer dimensions ------------------------------------------ 17
▪Circuit diagram -----------------------------------------------19
Contents
Warranty
▪Contents ------------------------------------------------5
▪Warranty and remedies -----------------------------------20
Before use
▪Inspect the product ----------------------------------6
Installation
▪Precautions about installation ----------------------7
▪Piping ----------------------------------------------------8
▪Electrical wiring ---------------------------------------9
Operation
▪Before start up ----------------------------------------11
▪Start-up and operation -----------------------------11
Maintenance
▪Maintenance standards --------------------------------13
▪How to carry out maintenance ----------------------14
Troubleshooting guide
▪Compressor ------------------------------------------------15
▪Auto drainer (Option) -----------------------------------15
Specifications
▪Compressor specifications -----------------------------16

6
Before use
▪Inspect the product
•Check that model name of the product is as you ordered.
Model name description;
•Check that there is no deformity or damage which occurred during shipment. Any shipping damage must be
immediately filed with the freight carrier.
•Check that the following accessories are included.
oCompressor instruction manual
oPiston pump instruction manual

7
Installation
▪Precautions about installation
WARNING
Do not use in an area which is exposed to rain, steam or high humidity.
High Humidity can cause electric shock or fire.
Do not install in an area with corrosive gas (ammonia, acid, salinity, ozone gas and sulfur dioxide).
If done, it can cause shorter lifespan.
湿度が高 と感電・発火の原因になります。
WARNING
Install in an area which is free of explosive, flammable gases or organic solvents.
If done, it can cause explosion and fire.
Ambient temperature
Use at ambient temperature of 36 degree F to 104 degree F.
Less than 36 degree F will cause failure or freezing.
４０℃および年平均 30℃以上では故障の原因になります。
CAUTION
Install this product on a flat floor.
If not, it may cause vibration and noise and shorten lifespan.
CAUTION
Install in an area which is free of dust.
Dust can cause increase temperature and wear, resulting in shorter lifespan and failure.

8
Installation
•Installation space
Secure the space around compressor for safe, inspection and maintenance.
Installation space
(inch)
Above
24
Each Side
20
•Ventilation
When using in totally closed room, install fan for ventilation.
Model
British Thermal Unit
(BTU)
OFB-1
2560
OFB-2
5120
OFB-3
7680
OFB-5
12800
OFB-7.5*
19200
OFB-10*
25600
OFB-15*
38400
▪Piping
•Do not use any steel pipe and a smaller size than the compressor outlet connection.
•Connect the auto drain as an accessary to the drain plumbing underneath the tank properly.
•When there is any riser piping, be sure to install drain collector or drain valve.
WARNING
Be sure to install the safety valve on the downstream piping from the compressor outlet.
The pressure setting of the safety valve must be no higher than the maximum working pressure of
the tank and maximum designed pressure of the compressor.
If not, it can cause serious failure.

9
Installation
▪Electrical wiring
•Precautions about wiring
Turn off main electric source.
Be sure to turn off main electric source before inspection or wiring job.
If not, it can cause electric shock or serious bodily injury.
Ask qualified electrician.
Ask qualified electrician to perform electric wiring job.
If not, it can cause electric shock or fire.
Be careful about wiring.
Do not use cable of less than designated size.
If done, overheat of cable can cause fire.
Be sure to ground.
Be sure to do the grounding on the wiring job.
If not, it can cause electric shock or fire.

10
Installation
•Wiring
Be sure to use the fork, pin or blade terminal to firmly connect the electric source to the designated place of the
magnet switch or terminal in the control box. Please refer to the circuit diagram shown in Appendix.
o208V-230V/460V, 3PH, 60Hz
Motor
Size
(HP)
Power
(V/PH)
Motor
Load
(FLA)
Non-time
Delay Fuse
(A)
Time Delay
Fuse
(A)
Inverse-time
circuit breaker
(A)
1
208/3
4.6
15
15
15
230/3
4.2
15
15
15
460/3
2.1
15
15
15
2
208/3
7.5
20
15
20
230/3
6.8
20
15
20
460/3
3.4
15
15
15
3
208/3
10.6
30
20
30
230/3
9.6
25
20
25
460/3
4.8
15
15
15
5
208/3
16.7
45
30
45
230/3
15.2
40
30
40
460/3
7.6
20
15
20
7.5
208/3
24.2
70
45
70
230/3
22
60
40
60
460/3
11
30
20
30
10
208/3
30.8
80
60
80
230/3
28
70
50
70
460/3
14
35
25
35
15
208/3
46.2
125
90
125
230/3
42
110
80
110
460/3
21
60
40
60

11
Operation
▪Before start up
•Make sure all safety warnings, labels, and instructions have been read and understood before continuing.
•Make sure any shipping materials, brackets, etc. are removed.
•Check that the electric power source and ground have been firmly connected.
•Make sure all pressure connections are tight.
•Check to be certain all safety relief valves, etc., are correctly installed.
•Check that all fuses, circuit breakers, etc., are the proper size.
•Make sure the inlet filter is correctly installed.
•Check that the drain valve is closed.
▪Start-up and operation
•Switch the electric source breaker on.
•Open the discharge valve completely.
•Turn the pressure switch on.
•Check that the compressor operates without excessive vibration, unusual noises or leaks.
•Close the discharge valve completely.
•If the pressure does not rise on a three phase unit, stop the unit and turn the electric source breaker off and
exchange the L1 and L3 connections inside the control box.
CAUTION
In case of reverse rotation, the pressure does not rise and abnormal sound is heard.
Immediately, turn the pressure switch off and turn the main electric source breaker off.
And, exchange the L1 and L3 connections inside the control box.

12
Operation
•Check the discharge pressure. Also make sure the compressor stops at the setting pressure as below.
Model
Cut-out pressure (psi)
OFB-1, 2, 3, 5, 7.5, 10 and 15
120
OFB-7.5H, 10H and 15H (Option)
145
•Check the discharge pressure. Also make sure the compressor starts at the setting pressure as below.
Model
Cut-in pressure (psi)
OFB-1, 2, 3, 5, 7.5, 10 and 15
90
OFB-7.5H, 10H and 15H (Option)
115

13
Maintenance
Following maintenance is required at certain interval. These intervals are based on condition where ambient
temperature is around 86 degree F. If your location is warmer or running condition is more sever, maintain within a
shorter period. If warmer shorten the period approx. 30% from our recommendation at every 9 degree F.
Standard maintenance period is not our warranty period.
▪Standard maintenance period
•A; OFB-7.5, 10 and 15, B; OFB-1,2; OFB-3, 5
Maintenance is to be done according to operating hours or period whichever comes first.
Item
Details
Maintenance period (every hours or periods)
Remarks
Daily
Every
400
/2 months
Every
2,500
/yearly
Every
5,000
/2 years
Every
7,500
/3 years
Every
10,000
/4 years
Every
15,000
/6 years
Drain
Air receiver
○
○☆
Noise, vibration
Check
○
Air intake filter
Clean
○
●
Whenever it is
dirty
Safety valve
Check function
○
V belt
Tension/replace
○
●☆
No slack or
loose
Pressure gauge
Check
○
Magnetic switch
Check/replace
○☆
●☆
Motor, insulation
Check resistance
○☆
Change as
necessary
Motor bearing
Check/replace
●☆
Pulley
Check
○☆
Change as
necessary
Pressure switch
Check function
○☆
Change as
necessary
Valve set
Cylinder cover
A
Check/replace
●☆
Use genuine
Parts
B
Check/replace
●☆
Use genuine
Parts
Piston ring
Piston set
Cylinder
A
Check/replace
●☆
Use genuine
Parts
B
Check/replace
●☆
Use genuine
Parts
Connecting rod
Piston pin
Bearing
A
Check/replace
●☆
Use genuine
Grease
B
Check/replace
●☆
Use genuine
Parts
○ Inspect ● Replace ☆Consult with distributor who sold it to you
＊Air intake filter is a wear part, and it is not free of charge even during warranty period. We suggest you keep it on hand.

14
Maintenance
▪How to carry out maintenance
•Intake filter
Blow dust off of it with air gun and replace if it is too dirty.
•Safety valve
Lift up stem of safety valve at around max pressure and check if air blows out.
•Belt tension
Check if V belt makes slipping sound at the startup due to decrease of V belt tension.
If so, you must readjust belt tension or replace belt.
Push the center point of span softly and adjust the tension with sliding the motor so that belt is deflected
about 0.4 to 0.6 Inch. Please refer to the drawing as below.
0.4 – 0.6 inch

15
Troubleshooting guide
If you have any problems, please refer to the below chart.
As * marked items are difficult for you to remedy, please contact the shop you have purchased it from.
▪Compressor
Problem
Cause
Corrective action
Compressor unit does
not start
Electric source is not ON.
Turn on electric source
Electric source is not connected
correctly.
Connect it correctly
Pressure switch is in OPEN position
Reduce pressure in air receiver
Power is at supply
connection and
compressor does not
start
Over load relay has tripped
See last entry of Troubleshooting guide
Wrong or low voltage
Inspect incoming power supply and unit power rating.
Starter has failed
Inspect, repair or replace contactor assembly *
Pressure switch has failed
Inspect, repair or replace pressure switch assembly *
Motor has failed
Inspect, repair or replace motor *
Compressor is running
but will not make
pressure
Drive belts came off or too loose
Inspect, tighten or replace drive belts *
Clogged intake filter element
Clean or replace intake filter element
Discharge air is leaking
Inspect and repair
Pump has failed
Inspect, repair or replace pump *
Pump running in the wrong direction
Correct power connections
Excessive noise or
vibration
Drive belt has flipped or slipped
Inspect, repair or replace drive belt *
Motor has failed
Inspect, repair or replace motor*
Pump has failed
Inspect, repair or replace pump
Compressor running hot
Ambient temperature is high
Be sure not to exceed above 104 degree F
Pump running at high pressure
Check tank pressure and pump outlet are not obstructed
After cooler fins clogged
Clean after cooler
Clogged intake filter element
Clean or replace intake filter element
Compressor turns
on/off rapidly
Receiver tank has high level of water
Drain condensation
Check valve has failed
Inspect, repair or replace check valve *
Pressure switch has failed
Inspect, repair or replace pressure switch *
Safety valve blows off
Motor starter contacts welded shut
Inspect, repair or replace motor starter *
Pressure switch has failed
Inspect, repair or replace pressure switch *
Motor overload has
tripped
Pump has failed
Inspect, repair or replace pump *
Motor has failed
Inspect, repair or replace motor*
Improper wiring
Inspect and rewire *
Wrong overload setting
Check setting of overload relay *
Low voltage
Check incoming power supply

16
Specifications
▪Compressor specifications
•1HP and 2HP
Item
OFB-1
OFB-2
Max. discharge pressure
psi
120
Air delivery (*1)
cfm
3.2
5.7
Air outlet
NPT 1/2”
Operating voltage
3Phase, 208-230/460V, 60Hz
Dimensions (L×W×H) (*2)
In.
32 x 21 x 17
32 x 21 x 17
Approx. mass
Lbs.
85
90
*1. Air delivery means average discharge air volume at the Maximum operating pressure converted into
atmospheric pressure. It is not a warranted figure.
*2. Dimensions are outer dimensions excluding extruding parts.
•5HP and 7.5HP
Item
OFB-3
OFB-5
OFB-7.5
Max. discharge pressure
psi
120
Air delivery (*1)
cfm
9.5
15.0
24.0
Air outlet
NPT 3/4”
Operating voltage
3Phase, 208-230/460V, 60Hz
Dimensions (L×W×H) (*2)
In.
44 x 25 x 25
44 x 25 x 27
47 x 24 x 25
Approx. mass
Lbs.
180
270
400
*1. Air delivery means average discharge air volume at the Maximum operating pressure converted into
atmospheric pressure. It is not a warranted figure.
*2. Dimensions are outer dimensions excluding extruding parts.
•10HP and 15HP
Item
OFB-10
OFB-15
Max. discharge pressure
psi
120
Air delivery (*1)
cfm
30.0
41.0
Air outlet
NPT 3/4”
Operating voltage
3Phase, 208-230/460V, 60Hz
Dimensions (L×W×H) (*2)
In.
47 x 24 x 25
47 x 27 x 25
Approx. mass
Lbs.
425
540
*1. Air delivery means average discharge air volume at the Maximum operating pressure converted into
atmospheric pressure. It is not a warranted figure.
*2. Dimensions are outer dimensions excluding extruding parts.

17
Appendix
▪Outer dimensions
▪OFB-1/2

18
Appendix
▪OFB-3

19
Appendix
▪OFB-5