Setting The Operating Pressure - Bottarini GDP21 Maintenance And Operating Manual

7. Putting the compressor into operation
Starting up the compressor:
* Close air tapping cocks.
*
Switch on main switch.
* Turn ignition switch to position "On" I.
*
All pilot lamps flash three times,
automatic self-test, then the Preheat,
battery charge and engine-oil pressure
lamps illuminate.
*
Engine can be started immediately if
ambient temperature is ≥ 10° C: Turn
ignition switch further to
At ambient temperatures < 10° C wait
until the Preheat indicator lamp goes
out and then turn the ignition switch
further to .
* Hold the ignition switch in position
until the engine starts running and the
"Battery charge" and "motor oil
pressure" indicator lamps go off.
*
Release the ignition switch.
* If the engine has not started after
15 seconds at the latest, turn the
ignition key back to position
Aus). As soon as the starter has
reached a standstill and the pressure
tank is no longer under pressure, the
engine can be started again.
* After the start, the engine runs at the
idling speed and the compressor at
reduced pressure.
*
If the engine was started cold, let it
warm up for approximately 2 minutes
and then press the load button (S2).
If the engine is warm, the load button
can be pressed immediately.
* The installation is now ready to
operate. Check that all the hoses and
tools have been connected correctly
and open the desired air outlet valves.
26
Start-up using jumper cables / auxiliary
batteries
,
Fig. 27
Danger
Longer operation with an auxiliary
battery or jumper cables connected
can lead to sudden emissions of gas.
An inflammable air / gas mixture is
formed. Explosion hazard!
Attention
Serious damage can be caused to the
electrical system if wrongly connected.
(Off-
* Ignition switch in position
*
First connect positive terminal then
negative terminal (ground).
* Start as described in section "Starting
up the compressor."
Note
After the engine has started, first
disconnect the negative cable(ground)
and then the positive cable.

7.4 Setting the operating pressure

Fig. 28
Danger
The setting of the operating pressure
may only be carried out by a specialist.
The operating overpressure of the screw
compressor is set by the manufacturer
(see the identification plate on each
compressor).
Pressure values can be set between
5 bar and the operating overpressure
stated on the rating plate. Pressure values
higher than this are not permitted.
Operating pressure is set by a specialist
(Off-Aus)
at the controller.
* Remove counternut below the control
knob of the regulator.
*
Raise pressure by turning the adjusting
knob of the regulator clockwise
(towards +).
*
Lower the pressure by turning the
adjusting knob of the regulator
anticlockwise (towards –).
* In order to lower the pressure, open an
air discharge valve.
* After altering the pressure, lock the
adjusting knob using the locknut.
This readjusted operating pressure is to
be checked using the pressure gauge on
the instrument panel at 100% air
discharge and maximum engine speed.