Instruction Manual
Airmac Air Compressors
2019-06-07
© Glenco Air & Power Pty Ltd
29
hold it there until the engine starts. Release the key as soon as the engine starts. Do not
engage the electric starter for more than five seconds at a time.
(b)
If the engine doesn’t start, release the key and wait 10 seconds before repeating the
previous step.
As the engine warms up, gradually move the choke lever rightwards to the open position.
Close the easy-start valve.
The compressor will now operate automatically. Whenever the air receiver pressure drops to or
below the pre-set cut-in pressure of approximately 800 kPa (116 psi) or 1,000 kPa (145 psi)
depending on the model, the engine will accelerate to full speed and the compressor will operate in
normal “pumping” mode. Then, whenever the air receiver pressure reaches the pre-set cut-out
pressure of approximately 1,000 kPa (145 psi) or 1,200 kPa (174 psi), respectively, depending on the
model, the engine will decelerate to idle speed and the compressor will operate in “unloading”
mode. When operating in unloading mode, it is normal for air to discharge in pulses from the
compressor pump’s air filter inlets.
To minimise mechanical wear and tear, fuel consumption, and exhaust and noise emissions, do not
operate the compressor unnecessarily for extended periods in unloading mode. Switch off the engine
instead.
To adjust the output air pressure from a compressor fitted with a filter-regulator, lift the black knob
on top of the filter-regulator to unlock it and then turn it to the desired setting by referring to its
pressure gauge. Then push the knob back down to lock it.
Alternatively, slowly open the outlet valve, but only if it is connected to a suitable compressed air
hose(s) or distribution pipe(s) not open to the atmosphere.
When compressor operation is no longer required, turn off the engine control switch before turning
off the engine fuel supply valve.
6.6
Diesel Air Compressors
Connect an air hose to the compressor’s discharge outlet coupling, if fitted, by pulling back the
locking collar on the socket, inserting a compatible Nitto-style male plug (fitted to one end of the air
hose) into the socket, and then releasing the locking collar. Check that the connection is secure by
ensuring that the locking collar is fully engaged and also by trying to pull the air hose away from the
coupling.
Alternatively, connect an air hose or flexible pipe to the compressor’s discharge outlet valve, if fitted,
using a compatible threaded male air line fitting. Check that the threaded connection is secure by
ensuring that it has been properly tightened and also by trying to pull the air hose or pipe away from
the outlet valve. Check that the outlet valve is closed.
Check that the emergency stop button, if fitted, is released; this can be verified by turning the stop
button head clockwise one-quarter of a turn.
Open the compressor’s easy-start valve.
Turn the engine fuel cock to the “ON” position. If you’re unsure of its location, refer to the separate
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