2.3.5
Electric Motors and Starters
Provide polyphase induction motors conforming to NEMA MG 1. Provide
[across-the-line magnetic] [reduced voltage] motor starters conforming to
NEMA ICS 1 and NEMA ICS 2. Provide phase failure, over voltage and under
voltage protection.
2.4
AIR-COOLED CONDENSERS, REMOTE-TYPE
Factory-assembled, design-tested, and rated in conformance with ARI 460.
Condensers shall be ready for operation after installation and field
testing.
2.4.1
Condenser Casings
Aluminum not less than one mm 0.040 inch in nominal thickness or steel not
lighter than 18-gage (1.31 mm 0.0516 inch) in nominal thickness. Provide
condensers having horizontal air discharge with discharge baffles to direct
air upward, constructed of same material and thickness as casing. Provide
wire screens or louvers over exposed condenser coil fins not protected by
the casing.
2.4.2
Capacity and Cross-Plot
Size condensers for full capacity at 17 degree C 30 degrees Ftemperature
difference between entering outside air and condensing refrigerant.
Entering dry-bulb, outside design air temperature shall be based on [_____]
degrees C degrees F. For design conditions, submit a cross-plot of net
refrigeration effect of condenser against net refrigeration effect of
compressor to establish net refrigeration effect and compatibility of
equipment furnished. Subcooling shall not be considered in determining
compressor and condenser capacities.
2.4.3
Condenser Coils
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NOTE: Research project location conditions to
determine the environmental effects on finned tube
coils. The research should include a survey of
existing similar equipment. Prepare project
specifications based on the conclusions of the
research. Consideration should be given to the
following combinations based on past experience of
these materials in dealing with the local conditions.
1.
Copper tube and aluminum fins, coated
2.
Copper tube and copper fins, coated
3.
Aluminum tube and aluminum fins, coated
4.
Aluminum tube and aluminum fins, uncoated
5.
Copper tube and copper fins, uncoated
6. Copper tube and aluminum fins, uncoated.
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Extended-surface fin-and-tube type.
Condenser coils shall be constructed
SECTION 15601N
Page 27
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