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TANDEM COMPRESSORS WITH TIMED CONTROL UNIT (fig. 21)
Fit the plug in the power socket and turn the pressure switch to
position "I" (ON). Turn the master power switch "A" on the control unit
to position I – power On is signalled by white indicator-light "E" going
on. Turn switch "B" to start the compressor. Pos. 1 pumping element
no.1 only is operating Pos.2 pumping element no.2 only is operating
Pos. 3 both pumping elements are operating simultaneously, at
staggered starting times. The compressor is fully automatic, and is
controlled by the pressure switch which stops it when tank pressure
reaches maximum value and restarts it when it falls to minimum value.
NOTE:
The head/cylinder/delivery tube unit can reach high
temperatures. Take care when working near these parts, and do not
touch them to avoid possible burns (fig.8-9).
The electro-compressors must be connected to a power socket
protected by a suitable differential switch (thermal-breaker). The
compressor motor is equipped with an automatic thermal-breaker
located inside the winding - this stops the compressor when the motor
reaches an excessively high temperature. If the breaker is tripped, the
compressor restarts automatically after 10 to 15 minutes.
The compressors V120/60/1 and V400/50/3 range are supplied with a
manually resetting amperometric thermal-breaker. When the breaker is
tripped, wait for a few minutes and then reset the breaker manually.
For compressors supplied with a control unit, the thermal-breaker is
installed inside the control unit. When the thermal-breaker is tripped,
observe the following procedure (fig. 22):
• Turn the switches on the control unit cover to position "0", open the
cover and press push-button 1 of the thermal-breaker. Close the cover
of the control unit and restart the compressor, observing the operations
described in the paragraph "Starting compressors with control unit".
ADJUSTING OPERATING PRESSURE (fig.10)
You do not have to use the maximum operating pressure at all times.
On the contrary, the pneumatic tool being used often requires less
pressure. On compressors supplied with a pressure reducer, operating
pressure must be correctly adjusted. Adjust pressure to the required
value by turning the knob (clockwise to increase pressure and anti-
clockwise to reduce it). Pressure can be seen on the gauge.
MAINTENANCE
Before attempting any maintenance jobs on the compressor, make
sure of the following:
Master power switch is in "0" position.
-
-
No pressure in the air tank.
Every 50 hours of duty, we advise you to dismantle the suction filter
and clean the filtering element by blowing compressed air on to it
(fig.11). You are recommended to replace the filter element at least
once if the compressor operates in a clean environment, but more
frequently if in a dusty environment. The compressor generates
condensation which accumulates in the tank. The condensation in the
tank must be drained at least once a week by opening the drain tap
(fig.12) under the tank. Take care if there is compressed air inside the
cylinder
as
water
could
Recommended pressure: 1 - 2 bar max. Condensation from of
compressors that are oil lubricated must not be drained into the sewer
or dispersed into the environment as it may contain oil.
OIL CHANGES - TOPPING UP WITH OIL
The compressor is filled with synthetic oil "SAE 5W50".We recommend
a full change of oil in the pumping element within the first 100 hours of
duty. Unscrew the oil drain plug on the housing cover, allow all the oil
to flow out and re-screw the plug (fig. 13- 14). Pour oil into the upper
hole of the housing cover (fig. 15-16) until it reaches the level indicated
on the stick (fig.5) or indicator (fig.7). Once a week: check oil level of
the pumping element and see if it needs topping up. For operation at
ambient temperature in the range -5°C to +35°C, use "SAE 5W50"
synthetic oil. The advantage of this oil is that is does not lose its
characteristics either in winter or summer. Do not drain used oil into
the sewer or dispose of it in the environment.
CAUTION:
flow
out
with
considerable
OBSERVE THIS TABLE FOR OIL CHANGES
Other types of oil: mineral multi-grade
Loss of air in valve under pressure switch
This can be caused by under tightening of the valve - take the
following action (fig.17):
-
Discharge all pressure from the tank.
-
Unscrew the hexagon-head of the valve (A).
-
Carefully clean both the rubber disk (B) and its seat.
-
Refit all parts accurately.
Air losses
This can be caused by under tightening of a union:
-
check all unions, wetting them with soapy water.
Compressor turns but does not load
(fig. 18)
This may be due to failure of the valves (C1 - C2) or of a seal (B1 -
B2): replace the damaged part.
(fig. 19)
This may be due to failure of the valves F1 and F2 or of a seal (D1 -
D2): replace the damaged part.
Compressor not starting
If the compressor has trouble starting, check the following:
-
Does mains power match that of the data-plate?
-
Are power cable extensions of adequate diameter or length?
-
Is the work environment too cold (under 0°C)?
-
Was the thermal-breaker tripped?
-
Is there enough oil in the housing to ensure lubrication? (fig. 7)
-
Is power supplied to the electrical line? (sockets well connected,
thermal-breaker, fuses in good condition).
Compressor not stopping
-
If the compressor does not stop when maximum pressure is
reached, the tank safety valve comes into operation. To repair the
valve, contact your nearest service centre.
-
Do not on any account unscrew any connection while the tank is
pressurised.
-
Always check that the tank is pressure free.
-
Do not drill holes, weld or purposely deform the compressed air
tank.
-
Do not perform any maintenance on the compressor unless you
have disconnected the power plug.
-
Ambient operating temperature range: 0°C +35°C.
-
Do not aim jets of water or flammable liquids on the compressor.
-
Do not place flammable objects near the compressor.
force.
During down-times, turn the pressure switch to "0" position (OFF).
-
-
Never aim the air jet at people or animals.
-
Do not transport the compressor while the tank is pressurised.
-
Take care, as some parts of the compressor, such as the head
and delivery tubes, as they can reach high temperatures. Do not
touch these parts to avoid burns (fig. 8-9).
-
To transport the compressor, lift or pull it with the appropriate grips
or handles.
-
Keep children and animals well away from the machine operating
area.
-
If using the compressor for painting:
a) Do not work in closed environments or near to naked flames.
b) Make sure there is adequate ventilation at the place of work.
c) Protect your nose and mouth with an appropriate mask.
-
If the electrical cable or plug are damaged, do not use the
compressor and contact an authorised service centre to replace
the faulty component with an original spare part.
-
If the compressor is located on a shelf above floor height, it must
be secured to prevent it falling while in operation.
-
Do not put objects or your hands inside the protective grilles to
avoid injury to yourself or damage to the compressor. (Do not use
the compressor as a blunt object toward objects or animals, to
avoid serious damage).
TYPE OF OIL
SYNTHESIS
Synthetic oil
SAE 15 W40
TROUBLESHOOTING
CAUTION:
GB
HOURS OF DUTY
500
300
100
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