ST16135-00C
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6
General Description
6
General Description
6.1
Compressor/Hypac (Fig. 6.1)
This User Manual covers the Hydrovane ACE HV11-HV22 vertical
range of compressors. The hypac range contains a compressor
and either a receiver or an air dryer or both, depending on the
installation required.
The compressor alone is used where air demand is constant and
does not exceed the output capacity of the compressor.
An air drier is used to provide dry air (pressure dew point 3°C) for
specialised applications.
Where air demand fluctuates a compressor plus receiver is used
to store large quantities of air. A drier can be combined with the
compressor and receiver for applications requiring large volumes
of dry air.
Figure 6.1 shows general views of typical units, the compressor
assembly is detailed in Para 6.3/Fig 6.2, the air drier is supplied
with its own manual.
Fig. 6.1 - General Views
6.2
Control Systems
Compressors can be operated either in automatic Stop/Start
mode or in continuous run mode.
All units benefit from REVS (Reduced Energy Venting System) to
minimise power consumption during operation.
On start up a short delay prevents full pressure delivery to reduce
motor power consumed.
With maximum line pressure established the venting system
lowers compressor pressure to provide substantial cost savings
due to the offload power reduction.
During offload run on time at minimum pressure the compressor
will either stop with no air demand or return to onload running if
more air is required.
Automatic Stop/Start Mode
This is the normal mode of operation giving maximum efficiency
and economy. Recommended for applications with fluctuating air
demands. With the auto mode selected, the compressor will load/
unload and stop/start automatically in response to air demand.
Motor restarts are set to 15 times per hour, single speed units
should be limited to 8 times per hour.
Run-on time to stop can be increased to reduce or limit motor
restart frequency to the lower level required.
Continuous Run Mode
When the continuous run mode is selected, the compressor will
continue to supply air from full to zero flow rates. In this mode the
energy saving benefits of REVS will not be maintained.
Regulated Speed Operation
Regulated speed compressors are automatic stop/start operation
only.
The Hydrovane Regulated Speed Vane compressor saves energy
and operating cost when compared with a fixed speed
compressor of similar size. The saving is achieved by
automatically regulating the compressor speed to precisely match
the compressor output to the system demand.
If the system pressure rises above the minimum air line pressure
the electric motor speed will decrease, conversely, if the system
pressure falls below the minimum air line pressure the motor
speed will increase. The speed will vary between minimum and
maximum limits dependent upon system demand.
