See Table I.
TABLE I - COMPRESSOR ACCESSORY ELECTRICAL SERVICE SCHEDULE
Item
Voltage
Phase
Control Power and
120
1
60 Hz
Motors under 3/8 kW
Accessory Power
460
3
60 Hz
TABLE I - COMPRESSOR ACCESSORY ELECTRICAL SERVICE SCHEDULE
Item
Voltage
Phase
Control Power and
120
1
60 Hz
Motors under 1/2 hp
Accessory Power
460
3
60 Hz
2.3.5
Compressor Controls
Provide a complete load regulation and control system with the compressor.
Provide additional electrical, electro-pneumatic, or solid state electronic
controls for other specified control and monitor functions. All electrical
controls shall conform to NEMA ICS 2 as selected by the compressor
manufacturer. Control system enclosure shall conform to NEMA ICS 6.
Controls shall be suitable for individual operation of the compressor or
parallel operation with one or more other compressors.
2.3.5.1
Compressor Start-Up
The compressor shall start unloaded. The manual starting circuit for the
compressor shall have interlocks to prevent the compressor drive motor from
starting until pre-lubrication pump (if provided), oil pressure, and
cooling water pump water flow have been established to the required values
for safe operation as determined by the compressor manufacturer.
2.3.5.2
The compressor shall operate continuously at constant speed after being
started. Provide means to load and unload the compressor automatically at
preset minimum and maximum pressure settings. Minimum pressure shall be
689 kPa (gage) 100 psig, and maximum pressure shall be 862 kPa (gage) 125
psig. Unloading shall be accomplished by a combination of closing the
inlet valve and bypassing or venting the outlet of the compressor; however,
input power at fully unloaded operation shall not exceed 20 percent of full
load input. Bypassed air shall be cooled by the bypass cooler and if
returned to the inlet of the first stage through an internal loop and shall
be limited to the minimum flow required to maintain compressor cooling.
Air vented to the atmosphere when unloading need not be cooled.
2.3.5.3
Monitor and Safety Controls
Provide supplementary electric, electro-pneumatic, or solid state
electronic controls to provide alarm and shutdown requirements, plus
interlocks with accessories. Requirements are as follows:
a.
Shutdown requirements shall cause the controlled compressor to
SECTION 15215N
Page 15
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