Bosch ACS 251, Original Instructions Manual, Page: 11 / 24

F 002 DG9 425 2014-03-20
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Bosch Limited
Commissioning | ACS 251 | 11 en
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459897_114Nk
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Fig. 7: Connecting the service hoses
1 Hose connection
2 Service hose end connection
3,4 Identification for HP and LP hose connection
10. Connect the end connectors of the service
hoses (Fig. 7, Pos. 2) to the hose connections
(Fig. 7, Pos. 1). Observe the red / blue identifica-
tion stickers on the front panel before connecting
the hoses. Tighten the hose connection.
!
Tighten the service hose end connectors by hand. Do
not use any tools.
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The HP hose (red hose) should be connected to the
hose connection with the red identification sticker
(Fig. 7, Pos. 4). The LP hose (blue hose) should be
connected to the hose connection with the blue
identification sticker (Fig. 7, Pos. 3). Do not inter-
change the HP and LP hose connections.
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Fig. 8: Fixing the couplers to the hoses
1 Coupler
2 O-ring
11. Insert the coupler unto the hoses and tighten.
Ensure that the O-rings used for connecting the
couplers to the hoses are properly placed before
tightening the coupler.
4.3 Powering on the ACS 251
1. Move the ACS 251 to a flat, vibration-free surface.
2. Apply the brake to prevent the unit from rolling away.
3. Connect the power cable to the power inlet of the
ACS 251.
4. Connect the power cable to the mains supply.
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Refer chapter 9 for the specifications of power supply.
5. Turn on the master switch.
"
The self test is initiated. The software version, business
logic version and the serial number of the ACS 251 are
displayed. Upon completion of the self test, the main
menu is displayed.
4.4 ACS settings
4.4.1 Setting the automode service parameters
The automode service parameters can be set via the op-
tion
System Defaults. If the system defaults are not set,
the default values of the parameters set at the factory
will be used during automode service.
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Refer to the vehicle documentation for the values of
the parameters.
1. Select System Defaults .
2. Set the following parameters:
$
Pressure increase time
$
Vacuum creation time
$
Vacuum test time
3. Press the u key and set the following parameters:
$
Oil quantity
$
R134a recharge quantity (Range: 100 g to 3000 g)
4. Press

and select the hose through which refriger-
ant is recharged.
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The default hose selection is HP and LP.
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The ACS settings are completed.
4.5 Filling the internal refrigerant
tank
Before the ACS 251 can be used, the internal refriger-
ant tank must be filled with R134a.