Jun-air 4000 series [no cabinet] User Manual download pdf (Page 12)

An hour meter is installed on all "BD" and "PD" models.

Observe after 1 month how many hours the compressor has

performed in order to obtain an impression of the maintenance

intervals - which are every 2000 working hours. However, at

least once every year.

Replace the air intake lters after each 2000 working hours

1. Switch off current.

2. Lift off the upper part of the cabinet (is locked with screws).

Be careful not to unplug the cable for the fan (this only

applies to model „P“) (g. 4).

3. Pull out the lters by means of inserting a screwdriver below

the rubber part. The new lters can then be pressed into

place (g. 5).

Compressors with adsorption dryer:

1. Test that the automatic dryer/lter works satisfactorily

by opening the manual control drain cock, which has an

internal tube leading to the bottom of the air receiver. If

water comes out, the dryer needs to be serviced. (See

"Adsorption Dryer Manual").

2. In order to avoid pressure loss due to saturated lter

element, the pre and after lters are equipped with a pop-

up indicator. When the lter element needs replacement,

the indicator turns red instead of green. Under normal

conditions the lter element must be replaced after

approx. 4000 working hours. If the environment is very

contaminated, intervals for changing lter element may be

2000 working hours. See "Adsorption Dryer Manual" for

further information.

3. After 2000 to 4000 working hours dependent on the working

conditions or when desiccant in inspection glass changes

color, the desiccant in the dryer system must be replaced,

see "Adsorption Dryer Manual".

Check the pumping time

The pumping time indicates the condition of the compressor

provided that there

are no leaks in the system where the compressed air may leak.

Test the compressor as follows:

1. Empty the air receiver of compressed air (the pressure

gauge shows 0 bar).

2. Close the outlet on the air receiver and check that the drain

cock is closed.

3. Start the compressor and note how long it takes until it

switches off.

Make sure that the pressure in the air receiver is 8 bar/120

psi as deviations may indicate the wrong results (see

technical details).

Important!

Always test the compressor when cold as the time

indicated refers to the pumping time of a cold

compressor. The pumping time of a warm compressor

is much longer and consequently, the result would be

misleading.

Automatic reset protector

The unit is equipped with a thermal protector that cuts of the

compressor motor if the temperature is too high or the amps

drawn by the unit exceeds a certain limit. The protector has a

automatic reset which means that when the temperature of the

motor drops under the cut-in value of the protector the motor

automatically will start operating.

Fault nding and repair

Important!

Switch off and isolate from electrical supply before

removing any parts from the compressor.

Empty air receiver of air before dismantling any parts

of compressor unit’s pressure system.

1. Compressor does not start (no sound):

a) No power from mains. Check fuses and plug.

b) Breakage or loose joints in electrical connections.

c) Pressure in the air receiver is too high for activation

of the pressure switch. The pressure switch makes

circuit only when pressure has dropped to preset start

pressure. Empty receiver.

d) Capacitor defective.

2. Compressor does not start, makes a buzzing sound

followed by clicking noise (cannot start against high

pressure):

a) Leaky non-return valve. Remove the exible pressure

pipe and clean to nd out whether air leaks from the

valve. If so, clean or replace.

3. Compressor works, but pressure does not increase in

tank (or increases too slowly):

a) Intake lter clogged. Replace.

b) Leaks in ttings, tubes or pneumatic equipment. Check

with soapy water. Pressure drop is not to exceed 1 bar

per hour.

c) Failure in non-return valve which is creating a ow

restriction.

d) Check the piston gaskets. Replace, if necessary.

e) Desiccant has been contaminated and/or lter elements

have been clogged (this only applies to model „D“).

Replace. See "Adsorption Dryer Manual".

4. Loud noise from compressor:

a) Dirt or failure in non-return valve. Clean or replace.

b) Defective fan (this only applies to model „P“).

5. Compressor gets very hot:

a) Leaks. See point 3b.

b) Intake lter clogged. See point 3a.

c) Too high ambient temperature. Do not enclose unit in a

cupboard unless adequately ventilated. The compressor

should be placed in coolest possible place.

d) The cooling fan at the top of the cabinet does not run

(this only applies to model „P“). Check pipes and fuses.

e) Overloaded. Ensure compressor is correct model for

work load.

6. Compressor starts when no air is being tapped:

a) Leaks. See point 3b.

7. Compressor starts and stops more frequently than

usually:

a) Large amount of condensate in air receiver (on units

without dryer). On units with dryer condensate may be

found if dryer is defective (this only applies to model

„D“).

b) Leaks. See point 3b.

8. Compressor does not switch on against pressure or

does not switch off at max. pressure:

a) Defective pressure switch. Replace.

Operating manual

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Jun-air 4000 series [no cabinet] User Manual Page 12

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