2.6.6
Compressor Driver, Electric Motor
Motors, starters, [variable speed drives], wiring, etc. shall be in
accordance with paragraph ELECTRICAL WORK. Motor starter shall be [unit
mounted] [remote mounted] as indicated with starter type, wiring, and
accessories coordinated with the chiller manufacturer. Starter shall be
able to operate in temperatures up to 120 degrees F.
2.6.7
Compressor Driver, Gas-Engine
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NOTE: Natural gas-engine drives are used in
conjunction with either reciprocating, rotary, or
centrifugal type compressors.
The decision to use a heavy duty industrial type
engine as compared to a standard automotive type
engine will be based strictly on an economic
comparison. The standard automotive type engines
have a much lower initial cost, but they must be
replaced and/or overhauled much more often. Also
note that typically, standard automotive type
engines are only available for chillers with a
capacity of 500 tons or less.
Guidance to Project Designers: When specifying
natural gas-engine drive chillers, close
coordination with the DPW (customer) must be
exercized. The designer should inform the DPW that
preventive maintenance and periodical overhaul of
the gas-engine drives is essential to ensure
continued operation, and that energy demand savings
are realized. While the initial cost of gas-engine
drives is much lower than other types, gas-engine
drives require more frequent maintenance and
overhaul.
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Gas-engine compressor driver shall operate on natural gas and be in
accordance with NFPA 37 and NFPA 54. Engine shall be designed for
stationary applications and include all ancillaries necessary for
operation. Engine shall be a manufacturer's standard production model and
be specifically designed for chiller operation. Engine shall include as a
minimum a [heavy duty industrial] [standard automotive] grade block,
starting system, lubrication system, coolant system, engine heat exchanger,
[engine cooling radiator,] fuel supply system, and controls package.
Engine shall be naturally aspired, supercharged, or turbocharged and
include appropriate air filters. Engine shall be 2- or 4-stroke-cycle and
compression-ignition type. Engine shall be vertical in-line, V- or
opposed-piston type, with a solid cast block or individually cast
cylinders. Engine shall have a minimum of 2 cylinders. Opposed-piston
type engines shall have not less than 4 cylinders. Engine block shall have
a coolant drain port.
2.6.7.1
Starting System
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NOTE: Specify either an electric or pneumatic type
starting system. Electric type system will be used
SECTION 15620A
Page 30
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