a refrigerant with an ozone depletion potential
(ODP) less than or equal to 0.05. R-22, R-123,
R-134a, R-407C, and R-410A all meet this requirement.
**************************************************************************
Refrigerants shall be one of the fluorocarbon gases. Refrigerants shall
have number designations and safety classifications in accordance with
ASHRAE 34. Refrigerants shall meet the requirements of ARI 700 as a
minimum. Refrigerants shall have an Ozone Depletion Potential (ODP) of
less than or equal to 0.05.
2.6.2
Structural Base
Chiller and individual chiller components shall be provided with a
factory-mounted structural steel base (welded or bolted) or support legs.
Chiller and individual chiller components shall be isolated from the
building structure by means of [molded neoprene isolation pads.] [vibration
isolators with published load ratings. Vibration isolators shall have
isolation characteristics as recommended by the manufacturer for the unit
supplied and the service intended.]
2.6.3
Chiller Refrigerant Circuit
**************************************************************************
NOTE: Filter dryers are not needed on chillers
which make use of a purge system.
**************************************************************************
Chiller refrigerant circuit shall be completely piped and factory leak
tested. For multicompressor units, not less than 2 independent refrigerant
circuits shall be provided. Circuit shall include as a minimum a
[combination filter and drier,] combination sight glass and moisture
indicator, liquid-line solenoid valve for reciprocating, an electronic or
thermostatic expansion valve with external equalizer, charging ports,
compressor service valves for field-serviceable compressors, and superheat
adjustment.
2.6.4
Controls Package
**************************************************************************
NOTE: For large water-cooled chillers (centrifugal
or rotary screw), motor starters and disconnects
switches which are to be remotely-mounted are not
typically supplied by the chiller manufacturer.
**************************************************************************
Chiller shall be provided with a complete [factory-mounted] [remote-mounted
where indicated], prewired electric or microprocessor based control system.
Controls package shall contain as a minimum a digital display or
acceptable gauges, an on-auto-off switch, [motor starters,] [disconnect
switches,] power wiring, and control wiring. Controls package shall
provide operating controls, monitoring capabilities, programmable
setpoints, safety controls, and EMCS interfaces as defined below.
2.6.4.1
Operating Controls
**************************************************************************
NOTE: For proper startup and head pressure
controls, enter the winter design temperature to
SECTION 15620A
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