Owner`s manual

7
If the power is “Network” distributed with 208 volts entering the building, order a 208-volt motor. If the starting voltage
is less than ninety (90) percent of the motor nameplate voltage, the motor cannot be expected to start, and the interior
building wiring must be corrected. IMPORTANT: If voltage drops lower than 188 volts a 200-volt motor should be used,
not a triple voltage (208/230/460) 3-phase motor. All 3-phase motors require external overload protection.
The wiring should be done by a licensed electrician who is familiar with the requirements of the National Board of Fire
Underwriters and of the local inspectors. Consult your local electrical contractor for electrical codes and recommended
wire sizes. Never connect 3-phase motors directly through the pressure switch. A magnetic starter of proper size c/w
overload relay is required.
Instruction Manual
Provisions must be made to have this manual readily available to the operator and maintenance personnel. If for any reason
any part of the manual becomes illegible or if the manual is lost have it replaced immediately. The instruction manual
should be periodically read to refresh one’s memory, as this may prevent a serious accident.
SYSTEM AND COMPONENTS SELECTION
Since Eagle will supply compressor packages in whole or in part, the following section provides information that will be
useful to both the installer and the assembler.
Pressure Pulsations
Total pipe length, either to or from the basic compressor, resulting in near resonant conditions can create serious problems.
Near resonant conditions occur when the pulsating flow of air in and out of the compressor cylinders is close to being
in tune with the natural frequency of the pipework, the compressor framework, and/or the surrounding structure (walls,
windows, etc.) Problems created by near resonant conditions are:
1. Overloading the compressor drive unit
2. Compressor valve breakage
3. Damage to the surrounding structure
4. Objectionable noise
5. Loss of air capacity
6. Aftercooler damage
7. Fatigue failure of pipework and structural supports
Methods of correcting near resonant conditions:
1. Change the length of discharge and/or suction piping
2. Strategically locate orifices or choke tubes in the piping system being careful not to create any excessive pressure
drops.
3. Add a commercial pulsation dampening device
4. Change the compressor speed
Piping Fitup
Care must be taken to avoid assembling the piping in a strain with the compressor; it should line up without having to
spring or twist it into position. Adequate expansion loops or bends should be installed to prevent undue stresses on the
compressor resulting from the changes between hot and cold conditions. Pipe supports should be mounted independently
of the compressor and anchored as necessary to limit vibration and prevent expansion strains.