Bosch CET4-20 Operating/Safety Instructions Manual page 11

AdjustInG reGulAtor
This compressor is provided with an internal regulator
that controls the output pressure of two female quick
connect couplers. Regulated pressure will be equal
to or less than tank pressure depending on user
setting.
To adjust regulated pressure (see Fig. 7):
1. Pull regulator knob out (A).
2. To increase pressure, turn clockwise.
3. To decrease pressure, turn counter clockwise.
4. When desired pressure is set, push regulator knob
in to lock pressure.
5. Regulated pressure gauge is displayed as (B).
ConneCtInG AIr suPPly
Firmly grasp the hose in hand
WARNING
when installing hoses. If hose is
not held firmly or correctly installed hose may whip
and injure personnel in the operating area.
INSTALLING HOSES (See Fig. 8):
1. Grasp the hose at the quick connect plug and push
the plug into the quick connect body. Coupler will
snap into place.
2. Grasp the hose and pull to ensure coupler is
seated.
oPerAtIon
Regulator (A)
Regulated Pressure
Gauge (B)
Fig. 7
Fig. 8
oPerAtInG temPerAtures
Operating temperatures are between 32 ° F and 104 ° F
(0 ° C and 40 ° C). If operating outside recommended
temperatures, unit may have difficulity starting and
will cause additional wear on components.
Disconnect the compressor from
WARNING
the power source, drain air tanks
and allow it to cool before making adjustments,
moving the compressor, leaving the work area,
performing maintenance
compressor. Such precautionary safety measures
reduce the risk of injury.
sHuttInG doWn tHe ComPressor
1. Move On/Off switch to the OFF position.
2. Turn regulator until outlet pressure gauge reads
0 psi.
3. Remove hose and assembly. See disconnecting
air supply below.
4. Drain air from the air tanks by releasing air by pulling
the safety release valve.
5. Once the air tank pressure is under 20 psi, open the
drain valve on the control panel to drain moisture
from the tanks (See draining tanks on page 12).
6. Allow the compressor to cool down before
storing.
dIsConneCtInG AIr suPPly
DISCONNECTING HOSES (See Fig. 8)
1. Ensure regulated pressure gauge reads 0 psi
(0 kPa).
2. Pull coupler on quick connect body back to release
quick connect plug on hose.
or storing the
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