F-1031, Section 2119
Page 3 of 24
The air compressor system used by the Waterous
Eclipse
ES is a Pneumax / GHH Rand model CF75DG,
oil flooded rotary screw type. Rotary screw air compres-
sors are very common in industrial applications. This type
of compressor injects oil into itself, where it lubricates,
seals, cools and silences the compressor. The oil is then
entrained into the air discharge from the compressor. This
air/oil mixture is discharged into the sump tank where
most of the oil separates from the air. The oil is then sent
via hydraulic hose to a combination filter/cooler unit. It is
filtered and cooled to remove compression and friction
heat, and sent to the oil injection port on the compressor.
The cycle is then repeated.
The oil mist that remains in the airstream 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.
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 pump inlet to remove heat from the compressor oil
system. The compressor oil temperature is typically in the
200 - 225
F range. Under maximum running condition, the
compressor oil temperature may reach 235
F. If the oil
temperature exceeds 235
F, check the water supply, wa-
ter strainer, pump prime, restrictions in the cooling water
system and for low oil level in the sump.
The air compressor (air end) is driven via a PolyChain
and pneumatic clutch through the pump transmission uti-
lizing an extended impeller shaft.
It is important to en-
sure that there is a water supply from the fire pump
whenever the compressor is running. Pump and/or
compressor damage may result from running the
pump without adequate water flow
.
General Description
