2.9.2
Factory Applied Insulation
Chiller shall be provided with factory installed insulation on surfaces
subject to sweating including the liquid cooler, suction line piping,
economizer, and cooling lines. Insulation on heads of coolers may be field
applied, however it shall be installed to provide easy removal and
replacement of heads without damage to the insulation. Where motors are
the gas-cooled type, factory installed insulation shall be provided on the
cold-gas inlet connection to the motor per manufacturer's standard
practice. Factory insulated items installed outdoors are not required to
be fire-rated. As a minimum, factory insulated items installed indoors
shall have a flame spread index no higher than 75 and a smoke developed
index no higher than 150. Factory insulated items (no jacket) installed
indoors and which are located in air plenums, in ceiling spaces, and in
attic spaces shall have a flame spread index no higher than 25 and a smoke
developed index no higher than 50. Flame spread and smoke developed
indexes shall be determined by ASTM E 84. Insulation shall be tested in
the same density and installed thickness as the material to be used in the
actual construction. Material supplied by a manufacturer with a jacket
shall be tested as a composite material. Jackets, facings, and adhesives
shall have a flame spread index no higher than 25 and a smoke developed
index no higher than 50 when tested in accordance with ASTM E 84.
2.10
FACTORY TESTS
2.10.1
Chiller Performance Test
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NOTE: Currently, most chiller manufacturers do not
have the ability to factory performance test
anything other than water-cooled chillers
(centrifugal or rotary screw) which have flooded
evaporators. In addition, most testing facilities
are only setup to test chillers 300 tons or larger
in capacity. The ability to performance test small
DX systems (water- or air-cooled) is almost
non-existent.
Chiller performance testing is a very expensive
requirement and should be carefully evaluated before
including it into a job specification. The ARI
certification program has gone a long way in recent
years of assuring chiller performance as specified.
The need for a performance test will be evaluated
against the customer's requirements and the
criticality of the installation. When a chiller
performance test is not required, ensure that
paragraph "SUBMITTALS" is edited to remove the
requirements for factory tests in SD-03 and SD-06.
If a performance test is deemed necessary to assure
that the capacity and efficiencies specified will be
met, then include this paragraph. Testing should
only be specified on water-cooled chillers between
1054 and 5622 kW (300 and 1600 tons). Tests may be
specified for smaller chillers in critical
applications where the tests are felt justified,
however, the designer must determine in the design
stage if such tests are available. In no case
SECTION 15620A
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