300HH, 375, 375H, 375HH, 425 AND 425H USER MANUAL R00 SECTION 5
66
The following procedure applies to a compressor
with full- load pressure rating of 100 psig (6.9 bar).
1. Remove the speed control module (mounted
on lifting bail) mounting screws and lift the
module away from the mounting surface.
Turn the module over to expose the engine
speed adjustment buttons.
2. Start the compressor and allow the engine to
warm- up to its normal operating tempera-
ture with the service valve closed.
3. With service valve closed, set the engine low
speed (idle) to it’s specified setting with the
LO (+) or LO (-) buttons on the speed control
module. Holding the LO (+) button will
increase the idle speed: holding the LO (-)
butting decreases the idle speed setting.
4. Adjust the pressure regulator setting to main-
tain 115 psig (8 bar) receiver tank pressure.
5. Gradually open the service valve to atmo-
sphere until the engine speed increases and
the receiver tank pressure stabilizes at 100
psig (6.9 bar). Adjust the engine high idle
speed to its specified setting with the HI (+)
or HI (-) buttons on the speed control mod-
ule. Holding the HI (+) button will increase
the high idle speed: holding the HI (-) butting
decreases the high idle speed setting.
6. Open the service valve to 100 psig (6.9)
(rated full- load pressure) and recheck maxi-
mum engine speed and control response.
Close the service valve and allow the com-
pressor to cycle and recheck the low engine
idle speed.
7. To reset the speed control module to the
default values, press the LO (+) and LO (-)
buttons at the same time.
1. Compressor Unit
2. Air Pressure Gauge
3. Warm-Up Control Valve
4. Receiver Tank
5. Pressure Regulator/Blowdown Manifold
6. Oil Return Line
7. Blowdown Line (To Fitting At Filter Hose)
Figure 5-4: Control System Adjustment—
Standard Pressure
WARNING
Operating the compressor at below its mini-
mum specified idle speed will damage the
compressor. Operating the compressor in
this condition will cause coupling and/or
compressor failure.
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