24
the ground wire connections are clean and
tight.
The wire used to feed the compressor circuit
should be selected and sized based on the
following conditions:
1. Motor full load amperage plus service
factor.
2. Ambient temperature in the area where
the wire is located.
3. Length of wire
4. Insulation type
This information may be found in the latest
edition of the National Electrical Code.
When installing a unit in a “Hazardous
Location”; that is in a location where fire or
explosion is a definite hazard, refer to the
appropriate section of the National Electrical
Code for further information.
CAUTION
IN ALL CASES, THE LOCAL, STATE, AND
NATIONAL ELECTRICAL CODES MUST
BE STRICTLY FOLLOWED.
AIR SUPPLY TO COMPRESSOR
(COOLING AND COMPRESSION)
Air supplied to the compressor should be free
of contaminants such as paint spray mist and
vapors, and other chemical vapors as well as
normally air borne dust and dirt particles.
Inlet air to the unit may vary slightly in
temperature without adversely affecting the
performance of the compressor. However,
ambient air temperature should be maintained
between 32° and 100°F to obtain desirable
performance.
The air filter supplied with the compressor
has an adequate flow capacity for most
applications. In particularly dirty locations
clean air may be ducted in from a clean air
source or special air cleaners may be
installed. Generally, most adverse conditions
may be overcome by regular servicing of the
filter furnished with the unit.
When bringing outside air into the
compressor building for cooling and/or
compression the air inlet to the compressor
building should be located away from
contaminants such as engine exhaust,
gases, steam and other harmful vapors.
Also, the opening to the building must be
protected from rain, snow and other air borne
debris by hoods as well as being located
above the ground/roof to prevent other foreign
matter pick up. For a typical ducting
arrangement refer to Figure 10.
Both inlet and outlet ducts must be sized so
that they are restriction free. Where ambient
temperatures are below 32°F (inlet air) the
temperature may be tempered by controlled
recirculation. This may be accomplished by
using adjustable louvers (or duct dampers) to
admit warm air from the outlet duct back into
the inlet duct at a controlled rate.
If duct filters are used, the filters must be
restriction free. Typical furnace filter material
may be used.
Table III shows the air flow in cubic feet per
minute (CFM) required for cooling:
TABLE III
MINIMUM COOLING AIR FLOW
MODEL FLOW, CFM
CL15SS,CUB 1900
CL20SS,CUB 2650
CL25SS,CUB 3300
CL30SS,CUB 3850
DISCHARGE PIPING
It is recommended that all bed plate units be
equipped with a system receiver or storage
tank. The nominal size of the storage tank
should be 200 gallons.
WARNING
THE SYSTEM STORAGE RECEIVER
MUST BE EQUIPPED WITH A PRESSURE
RELIEF VALVE WITH THE CORRECT
PRESSURE RELIEF SETTING AND FLOW
CAPACITY. THE RELIEF SETTING MUST
NEVER EXCEED THE MAXIMUM
ALLOWABLE WORKING PRESSURE AS
STATED ON THE VESSEL NAMEPLATE.
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