BE AC255 User manual

HIGH CFM
AIR COMPRESSOR
AC255
USER MANUAL

23
table of contents
Introduction
4Using the Operator’s Manual
4Specifications
Product Identification
5Record Identification Numbers
Safety
6Receipt and Inspection
6Description
7Safety Instructions
7Hazard Symbols and Meanings
8Warnings
Installation
10 Mechanical
10 Electrical
10 Motor
10 Reset Switch
11 Pressure Switch
11 Air Pressure Regulator
11 Grounding
12 Extension
Lubrication
12 Oil Filling
12 Oil Change
Start Up
13 Procedure
Maintenance
14 Daily
14 Weekly
14 Quarterly or 300 Hours
Storage
14 Procedure
Troubleshooting
15 Troubleshooting Chart
Exploded View
17 Exploded View
Parts List
18 Parts List

45
Using the Operator’s manual
Thank you for purchasing a BE High CFM Air Compressor. Your
machine is designed for long life, dependability, and the top
performance you demand! Please take time now to read through
this manual so you better understand the machine’s operation,
maintenance, and safety precautions.
Everyone who operates this machine must read and understand
this manual. The time you take now will prolong your machine’s
life and prepare you for its safe operation. Enjoy the exceptional
performance of your BE High CFM Air Compressor, the industry leader!
The manufacturer reserves the right to make improvements in design
and/or changes in specifications at any time without incurring any
obligation to install them on units previously sold.
Attention: Read through the complete manual
prior to the initial use of your compressor.
Record Identification Numbers
Compressor
If you need to contact an Authorized Dealer or Customer Service line
(1-800-663-8331) for information on servicing, always provide the
product model and identification numbers.
You will need to locate the model and serial number for the machine
and record the information in the places provided below.
Date of Purchase:
Dealer Name:
Dealer Phone:
Product Identification Numbers
Model Number:
Serial Number:
introduction product indentification

67
The safety alert symbol ( ) is used with a signal word (DANGER,
CAUTION, WARNING), a pictorial and/or a safety message to alert
you to hazards.
DANGER WILL cause DEATH, SEVERE INJURY or substantial
property damage.
WARNING CAN cause DEATH, SEVERE INJURY or substantial
property damage.
CAUTION WILL or CAN cause MINOR INJURY or property damage.
NOTICE indicates a situation that could result in equipment
damage. Follow safety messages to avoid or reduce the risk of
injury or death.
Save these Instructions
SAFETY RULES
This is the safety alert symbol. It is used to alert
you to potential personal injury hazards. Obey
all safety messages that follow this symbol to
avoid possible injury or death.
RECEIPT AND INSPECTION
Each air compressor outfit is carefully tested and inspected before
shipment. Every attempt is made to ensure safe and complete shipment
of our products. It is the responsibility of the receiver of the goods to
ensure the product has been shipped in full and has arrived in suitable
condition. If there are any mechanical issues with your compressor,
please contact us for service.
It is your responsibility to ensure that the air compressor is properly
readied for use, as well as maintained and serviced on a regular basis.
Information has been included in this booklet outlining the suggested
air compressor maintenance schedules and a trouble shooting guide.
Be sure to follow the instructions in section 6.1 before turning your
compressor on. It is important that you read this information and keep
it in a safe place for future reference.
DESCRIPTION
The air compressor pump works with the up and down of a piston
in the cylinder. During the down-stroke of the piston, ambient air is
drawn in through the inlet valve, while the discharge valve remains
closed. During the up-stroke, the air is forced into the compressor
tank through the discharge valve and the check valve. Through this
controlled action, air is forced into the tank to a preset pressure.
The pressure is regulated by the pressure switch. Working air is not
available until the pressure in the air tank built up. The air inlet filter
openings must be kept clear of obstructions.
All tools require specific air pressure to operate properly. Consult your
air tool manual for those requirements and safety instructions. There
are a variety of air tools available that will operate eciently with this air
compressor. For best results, always compare the air tool requirements
to your compressor output specifications. A tool that requires a lot
of continuous air, such as a sander, will not operate eectively with
a small tank compressor. A tool that requires little air, such as a brad
nail gun, will operate with a small tank compressor very eectively.
Learn your air tool power requirements, match your air tools to your
compressor correctly and this compressor will perform eectively.
safety safety

89
WARNING
• Do not spray combustible or flammable liquid or
paint within a confined area. Spray area must be
well ventilated.
• Do not smoke while spraying or spray where spark
or flame is present.
• Keep compressor at least 12 ~ 18 feet away from
spraying area and all explosive vapors.
WARNING
• Hot surface can cause serious injury. Never touch
any exposed metal parts on compressor during or
immediately after operation. Touching these areas
may cause severe burns.
•Do not reach around protective shrounds or
attempt maintenance until unit has been allowed to
cool.
WARNING
• Do not use compressored air for breathing. When
spraying use respiratory protection in a well
ventiled area.
• Compressor air from the unit may contain
poisonous vapours which is not suitable for
inhaleing and could be harmful to your health.
• Work in an area with good ventilation.
WARNING
• Unit starts automatically. Do not operate with
guards or covers removed or broken.
• Any repair required on the product should be
performed by authorized service center personnel.
• Do not touch moving parts.
WARNING
• Always wear ansi z87.1 Approved safety glasses
with side shields when use the air compressor.
Always wear proper safety equipment while using
compressored air.
• Do not direct air stream toward any parts of the
body or at other people.
• Unplug power cord and drain all air pressure from
tank before servicing and after each use.
WARNING
• Always place compressor on a protective mat when transporting
to protect against damage to vehicle from leaks.
• Never operate compressor on a roof or other elevated positions.
• Always operate compressor in a stable position to prevent
accidental movement of the unit.
WARNING
• Disconnect compressor from electrical supply
circuit before servicing.
• Do not expose compressor to rain or operate in a
wet area.
• Never use the air compressor without connection
to a properly grounded outlet with the specified
voltage and fuse protection.
• Improper grounding can result in electrical shock.
WARNING
• Drain tank daily. Condensed water will cause
rusting and risk of tank rupture or explosion.
• Do not repair, modify or weld tank. Return to
authorized service center if replacement is required.
• Do not adjust regulator to result in output pressure
greater than marked max. Pressure of attachment.
• Pressure switch is set at the factory for optimum
performance of your particular model. Never
bypass or remove pressure switch as serious
damage to equipment or personal injury could
result from too high of pressure.
• Before starting compressor, pull safety valve ring to
make sure the valve moves freely. The safety valve
is factory installed to prevent the air receiver from
damage should malfunction occur in the pressure
switch. It is factory set at a specific limit for your
particular model, and should never be tampered
with. Adjustment by user will automatically void
warranty.
safety safety
WARNINGS

10 11
installation installation
Installation
MECHANICAL
Use the compressor in a clean, dry and well ventilated area. The
compressor should be located 12 ~ 18 inches from a wall or any
other obstruction that would interfere with the air flow cooling
function. Place the air compressor on a firm and level surface. The
air compressor is designed with heat dissipation fins that allow for
proper cooling. Keep the fins and other parts that collect dust or dirt
clean. A clean compressor runs cooler and promotes longer life. Allow
room for easy access to the air compressor for maintenance and
service work.air tool power requirements, match your air tools to your
compressor correctly and this compressor will perform eectively.
ELECTRICAL
It is your responsibility to ensure that the air compressor is connected
to power source in a safe and correct manner. Any electrical work
should be carried out by a licensed electrician and installed in a way
that meets all applicable codes and regulations. Failure to connect
the air compressor correctly to power source may result in serious
personal injury or damage to the equipment.
Please note that under normal conditions, the air compressor will
operate intermittently. Should it be necessary to service your air
compressor, ensure the power source has been shut down. This must
be done to prevent personal injury or damage to the unit.
If the supply cord is damaged, it must be replaced by your dealer or
all warranties and liabilities are void.
MOTOR
Wiring must be completed in a manner that the full voltage
nameplate ±10% is available at the motor terminals during startup.
Use of an incorrect power source will result in premature motor
failure and is not covered by this compressor or motor manufacture’s
warranty.
RESET SWITCH
Ensure that all guards and shrouds are in place before pressing reset
switch to restart the motor. If the motor shuts
down because of overload, wait 10-15 minutes
for the motor to cool down, then press the
reset switch to restart motor. The reset switch
button is located on the motor housing.
PRESSURE SWITCH
The pressure switch acts as a pilot device activating the motor. The
pressure switch cut in/cut out has been preset at the factory, do not
tamper with the settings. Never bypass or remove this switch, as serious
damage to equipment or personal injury could result from improper
pressure setting. Consult your local distributor or service center if the
switch malfunctions.
This pressure switch houses the “AUTO”, or “ON” switch as well as the
“OFF” switch. The term “AUTO” is used because it activates the motor
and allows the pump to operate until the compressor reaches the preset
pressure. Once up to the preset pressure, the motor stops and switches
to standby mode. After air is bleed o through use of otherwise,
the pressure switch then will kick the motor back into operation so
the proper air pressure will always be
maintained. Thus, the compressor does
have current readily available to operate
the pump, and will draw on the electrical
supply automatically upon need.
Always set this switch to “OFF” when
the compressor is not in use and before
unplugging compressor.
AIR PRESSURE REGULATOR
The air pressure regulator enables you to adjust outlet pressure to the
tool in use. Never exceed maximum working pressure of the tool. To
adjust, turn clockwise to increase pressure, or turn counterclockwise
to decrease pressure to the tool. Turn the thread nut against knob to
lock in place.
GROUNDING
Do not modify the plug that has been provided. If it does not fit the
available outlet, the correct outlet should be installed by a qualified
electrician. The plug must be plugged into an outlet that is properly
installed and grounded in accordance with all local cades. If these
grounding instructions are not completely understood, or if in doubt as
to whether the compressor is properly grounded, have the installation
checked by a qualified electrician.
This product is for use on a nominal 115 or 230 volt circuit, as
applicable. A cord with a grounding plug as shown here must be used.
Make sure that the product is connected to an outlet having the same
configuration as the plug. No adapter should be used with this product.

12 13
EXTENSION CORDS
The use of any extension cord will cause some drop in voltage and loss
of power. Do not use an extension cord unless absolutely necessary.
It is better to use a long air hose to reach area where work is being
performed. If use of an extension cord can not be avoided, refer to the
following guidelines before using.
Use only 3-wire extension cord that has a 3-blade grounding plug.
Make sure your extension cord is in good condition. Be sure gauge is
sucient to carry the current the unit will draw. Note that the smaller
the gauge the heavier the cord. Example: Gauge 10 is heavier than
gauge 12. Do not use 14 or 16 AWG for extension cord.
Lubrication
OIL FILLING
1. Remove the oil filler plug.
2. Slowly pour the proper oil into the pump crankcase.
3. Always keep oil level between the marks “High” and “Low” level on
the oil dipstick (or on the red circle of the sight glass).
OIL CHANGE
Change oil after the first 8 hours of compressor operation, then
change oil after every 300 working hours or 3 months whichever
comes first.
1. Remove the oil drain plug and allow oil to drain out. Used oil should
be handled by recycle agents.
2. Replace the oil drain plug. The use of a sealing compound or Teflon
tape to avoid leakage is recommended.
3. Refill with the recommended oil to the proper level.
Start Up
PROCEDURE
Do not attempt to operate the air compressor without first checking
the oil level in the pump.
Add oil as required. Serious damage may result from running without
oil.
1. Check to see that nuts and bolts are all snug.
2. Check that compressor is on a stable level surface.
3. Check that air filter is clean.
4. Do not place any materials on or against the compressor.
5. Open the drain valve at the bottom of the tank.
6. Turn the pressure switch lever to “AUTO”.
7. Ensure air is escaping from the drain valve. Allow the unit to op-
erate for a minimum of twenty minutes in this no load condition.
8. After running the compressor for twenty minutes, close the drain
valve and allow the unit to reach maximum operating pressure.
Ensure that the compressor shuts down at the preset maximum
pressure. Notice that the head pressure is released through the
unloading valve of the pressure switch.
9. Check the air compressor and piping systems for leakages.
10. Recheck the oil level in the crankcase. Add oil as required.
11. Your compressor is ready for use.
WARNING
• Before doing any maintenance or adjustments to your air
compressor, the following safety precautions should be taken.
A. Disconnect electrical power.
B. Drain air tank to release air pressure.
lubrication start up

14 15
Maintenance
DAILY
1. Check oil level.
2. Drain condensation from air tank.
3. Check for any unusual noise or vibration.
4. Be sure all nuts and bolts are tight.
WEEKLY
1. Clean air filter. Replace air filter if necessary.
QUARTERLY OR 300 HOUR
1. Change compressor oil and air filter element.
2. Check safety valve.
3. Check pressure switch unloads to ensure compressor head unloads
whenever motor shuts down.
4. Clean and blow o pump fins and motor.
5. Inspect air system for leaks by applying soapy water to all joints.
Storage
PROCEDURE
1. Set the “AUTO/OFF” switch to “OFF” and unplug the compressor.
2. Be sure to drain the water from the air tank.
3. Protect the electrical cord and air hose from damage.
4. Store the air compressor in a clean and dry location.
Troubleshooting
TROUBLESHOOTING CHART
CONDITION CAUSE CORRECTIVE
Compressor won’t start 1. Loose electrical
connection
2. Motor overheated
1. Check wiring connection
2. Press reset button or
wait for automatic reset
Low pressure 1. Air leak in safety valve
2. Loose tube or fittings
3. Restricted air filter
4. Defective check valve
5. Worn out rings
1. Release safety valve
manually by pulling
outward on ring. If
condition persists
replace valve
2. Tighten fittings
3. Clean or replace
4. Replace check valve
5. Replace piston rings
Air is releasing from safety
valve continuously
1. Defect pressure switch or
improper adjustment
2. Defective safety valve
1. Check for proper
adjustment and if
problem persists replace
pressure switch
2. Replace safety valve
Oil discharge and excessive
carbon formation or
appearance of water and
oil in the air lines
1. Improper oil viscosity
2. Overfilling the crankcase
with oil
3. Restricted air intake filter
4. Carbon on exhaust
valves
5. Worn valves
6. Worn piston rings
7. High ambient
temperature and/or
humidity
8. High percentage of
running time
1. Replace oil with SAE 30
Weight non-detergent
compressor oil
2. Drain oil and fill to
proper level
3. Clean or replace filter
4. Replace
5. Replace
6. Replace piston rings
7. Install a moisture
separator and/or oil
filter
8. Check for air leakage. If
no leaks are found , you
may need an additional
compressor as your air
demand is too much for
the existing unit
Excessive noise 1. Loose valve
2. Noisy only during start
up, Check for loose belts
3. Piping loose
4. Unit operates on unlevel
surface
5. Improper grade of oil in
crankcase
6. Carbon or foreign
material on piston
7. Worn bearings
1. Inspect valve
2. Adjust for proper tension
3. Tighten bolts and nuts as
required
4. Ensure that unit is on
level surface
5. Replace oil with SAE 30
Weight non- detergent
compressor oil
6. Clean piston. Check
cylinder walls for scoring
7. Replace main bearings
maintenance troubleshooting

16 17
CONDITION CAUSE CORRECTIVE
Compressor over heating 1. Undersized unit for air
requirements
2. Compressor location
3. Air leaks in the system
4. Restricted air filter
5. Improper grade or level
of oil
6. Worn, damage, or carbon
build up on valve
7. Carbon build up at after-
cooler tube or check
valve
1. Contact your dealer /
distributor
2. See installation section
3. Fix leaks
4. Clean or replace filter
5. Replace with SAE 30
Weight non-detergent
compressor oil
6. Clean, repair or replace
valves
7. Clean or replace
Pressure switch unloading
valve does not function
or leak air when unit is
operating or not operating
1. Pressure switch
unloading valve may be
dirty or faulty
2. Check valve may be dirty
or faulty
1. Clean, or replace
unloading valve
2. Clean, or replace check
valve
Water in air tank 1. Condensation in the air
tank during normal usage 1. Drain daily or install an automatic drain
Oil leaks or appearance of
oil on the compressor 1. Spillage of oil when filling 2. Overfilling the crankcase
3. Improper grade of oil
4. Leak at oil filler plug
5. Oil leak at gasket,
cylinder or crankcase
6. Loose plug
7. Loose side or end plate
8. Oil seal leak
1. Wipe unit clean
2. Drain oil and fill to proper
level
3. Replace with proper
SAE 30 non-detergent
compressor oil
4. Tighten or replace oil
filler plug
5. Replace gaskets as
required
6. Tighten plug
7. Tighten plates
8. Replace oil seal
troubleshooting exploded view

18 19
parts list
No. Description QTY
1 bolt 4
2 spring washer 8
3 plain washer 4
4 easy start valve 1
5 elbow 1
6 cylinder head 1
7 gasket 1
8 valve plate 2
9 air filter 1
10 valve reed 2
11 gasket 1
12 cylinder 1
13 bolt 2
14 spring washer 2
15 seal gasket 1
16 compression ring 2
17 oil control ring 1
18 piston 1
19 piston pin 1
20 circlip 2
21 connecting rod 1
22 crankshaft 1
23 nut 3
24 bolt 1
25 plain washer 10
26 bolt 10
27 spring washer 1
28 nut 1
29 oil plug 1
30 o ring 1
31 rear cover 1
32 bolt 4
33 sightglass 1
34 bolt 1
35 o ring 1
36 seal gasket 1
37 crankcase 1
38 running capacitor 1
39 seal 1
40 bearing 1
41 rotator assembly 1
42 bearing 1
43 thermal protector 1
44 stator assembly 1
45 support 1
46 front cover 1
47 fan 1
48 circlip 1
49 plain washer 4
50 spring washer 4
51 bolt 4
parts list
52 shroud 1
53 3-cord power wire 0.68
54 hand grip 3
55 handle 1
56 bracket sheath 6
57 cushion 2
58 bolt 2
59 tool box lock 1
60 torsion spring 1
61 bolt 6
62 tool box 1
63 power plug wire 1
64 outlet hose 1
65 elbow 1
66 end cap 3
67 pressure switch 1
68 gauge 2
69 safety valve 1
70 quick coupler 2
71 regulator 1
72 drain valve 1
73 tank assembly 1
74 rubber foot 2
75 plain washer 2
76 bolt 2
77 wheel 2
78 wheel cushion 2
79 washer 2
80 bolt 2
81 spring washer 2
82 inlet assembly 1
83 seal gasket 2
84 straight joint 1
85 check valve 1
86 elbow 1
87 ferrule 2
88 nut 1
89 alumium tube 1
90 nut 1
91 bolt 4
92 spring washer 4
93 plain washer 4
94 lock pin 1
95 lock pin spring 1
96 nut 2
97 pull-tab 1
98 set screw 1
99 spring 1
100 steel ball 1
101 cotton cushion 1