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The air compressor used is a GHH Rand oil flooded rotary
screw type. Rotary screw air compressors are very com-
mon in industrial applications. This type of compressor in-
jects oil into itself, where it lubricates, seals, cools and si-
lences the compressor. The oil is then entrained into the
air discharge from the compressor. The air/oil mixture is
discharged into a sump tank where most of the oil sepa-
rates from the air. The oil is then sent via hydraulic hose
to a combination cooler/filter unit. It is cooled to remove
compression and friction heat, filtered, and sent to the oil
injection port on the compressor. The cycle is then re-
peated.
The oil mist the remains in the air stream is recovered by
an air/oil separator system. This system recovers the oil
mist in a spin-on cartridge that has a siphon tube that
picks-up the recovered oil for return to the air compressor.
Daily Checks
Check the following fluid levels daily or prior to operating
the system:
•
Compressor system oil (Oil level should be visible
within the sight glass on the sump and should be
checked daily or before or after used.)
•
Foam concentrate
•
Onboard water supply
F-1031, Section 2449
Air Compressor Function
Operation
The Waterous compressed air foam unit can be operated
in several pumping modes; water only, foam
solution without compressed air, compressed air foam
and compressed air only for support operations such as
operating air tools, filling rescue air bags, etc. It is possi-
ble to pump foam solution from one discharge while
pumping compressed air foam from another, or varying
foam consistencies (expansion ratios) from different dis-
charges simultaneously.
NOTE: Monitor engine and compressor instruments
during any and all operations
The compressor's air output is controlled by a modulating
inlet valve. The inlet valve is opened and closed by the
Auto-Sync pressure control system.
The compressor cooling system circulates water from the
fire pump through the compressor oil cooler and back to
the tank to remove heat from the compressor oil system.
The compressor oil temperature should not exceed 250F.
If this occurs, check the water supply; pump prime, re-
strictions in the cooling water system and for low oil level
in the sump.
The air compressor (air end) is driven by a dry Poly Chain.
The pump/air end are PTO driven by the engine. It is im-
portant to ensure that there is a water supply from the fire
pump whenever the system is running. Pump and/or com-
pressor damage may result from running the pump dry.
Modes of Operation
Page 3 of 18
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