Bosch ACS 251, Original Instructions Manual, Page: 6 / 24

F 002 DG9 425 2014-03-20
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Bosch Limited
6 | ACS 251 | User information en
Do not use compressed air with R134a.
Some mixtures of air and R134a are highly
flammable at high pressure. These mixtures
are potentially hazardous and can cause
fires or explosions resulting in damage to
property and injury to persons.
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Refrigerant extracted from the vehicle A/C system
might be contaminated with moisture, lubricant, dirt
and traces of other gases.
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The ACS 251 does not have any refrigerant identifier
system. If refrigerants other than R134a are used, it
might lead to contamination.
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R134a is colorless, odorless and heavier than air. It
expels oxygen and can flow into repair pits. If the
refrigerant escapes, there is a risk of suffocation in
poorly ventilated rooms or repair pits.
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R134a may not be used in environments with a risk
of explosion. Fire, naked flames and smoking are
prohibited. No welding or soldering is allowed. High
temperatures and UV radiation can cause R134a to
chemically separate. The resulting products cause
coughs and nausea.
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R134a may not be mixed with other refrigerants.
Mixing refrigerants can cause damage to the vehicle
A/C system.
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The ACS 251 must always be monitored during op-
eration. Do not leave the ACS 251 unattended when
it is switched on.
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Vehicle A/C service, using the ACS 251, must be pre-
pared and carried out in such a way that the vehicle
A/C circuit is not opened (for example, radiator or
engine removal).
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The ACS 251 should be positioned with all four
wheels on a flat, vibration-free surface to ensure
correct operation of the load sensors. The ACS 251
can be prevented from rolling away by applying the
brake.
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The ACS 251 must always be transported in a verti-
cal position. Do not invert the ACS 251.
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There are no additional safety provisions for protect-
ing the ACS 251 unit against damage in the event of
natural calamities like earthquakes, fires, floods etc.
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Except for maintenance work, do not remove any
pressurized equipment inside the
ACS 251 unit. Adhere to the national laws or regula-
tions for ensuring safety of pressurized equipment.
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We recommend that calibration of load sensors be
done at least once every year. Contact customer
service for calibration of load sensors.
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The ACS 251 must be regularly inspected by service
personnel or the approved authorities to ensure
safety of the unit.
Warning - Risk of frostbite in the event of
refrigerant leakage!
If refrigerant escapes, there is a risk of frost-
bite to the hands and body.
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Wear protective goggles.
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Wear protective gloves.
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Ensure that the HP and LP hoses are not
damaged.
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Ensure that the quick couplers are tightly
fixed to the hoses.
Warning - Risk of frostbite during removal
of service hoses!
If refrigerant escapes, there is a risk of
frostbite to the hands and body.
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Carefully disconnect service hoses as all
hoses can contain pressurized
refrigerant.
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Only connect to a properly grounded electrical
outlet.
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Do not attempt to shut off the valves on the R134a
tank when the ACS 251 is in operation.
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For the purposes of safety, it is recommended to use
an Earth Leakage Circuit Breaker (ELCB) with the
following specifications:
Parameter Specification
Rated voltage 230 VAC +/- 10%
Rated frequency 50/60 Hz
Rated current 10 A
Rated trip current 30 mA
Tripping curve C
2.5 Safety devices
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Pressure switch - Switches the compressor off if the
normal operating pressure is exceeded.
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Safety valve: Operates when the design pressure is
exceeded.
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Fuse: Interrupts excessive current flow into the
ACS 251.