Specifications
36 Cat 604-3
Engineering Guide Specifications
entire unit, for a period of one year from equipment startup
or 18 months from shipment, whichever occurs first. OR,
B The chiller manufacturer's warranty shall cover parts and
labor costs for the repair or replacement of defects in
material or workmanship, and include refrigerant for the
entire unit, for a period of one year from equipment startup
or 18 months from shipment, whichever occurs first, and
also include an additional extended warranty for (one OR
two OR three OR four) years on (the entire unit) OR (on
entire unit including refrigerant coverage) OR (compressor
and drive train only).
1.7 MAINTENANCE
A Maintenance of the chillers in accordance with
manufacturer’s recommendations as published in the
installation and maintenance manuals, shall be the
responsibility of the owner.
PART 2 - PRODUCTS
2.1 ACCEPTABLE MANUFACTURERS
A Basis of Design - Daikin McQuay Magnitude Model
WMC/WME, including the standard product features and
all special features required per the plans and
specifications.
B Equal Products - Equipment manufactured by [ENTER
MANUFACTURER NAME HERE] may be acceptable as
an equal. Naming these products as equal does not imply
that their standard construction or configuration is
acceptable or meets the specifications. Equipment proposed
“as equal”, must meet the specifications including all
architectural, mechanical, electrical, and structural details,
all scheduled performance and the job design, plans and
specifications.
2.2 UNIT DESCRIPTION
A Provide and install as shown on the plans a factory
assembled, charged, and run-tested water-cooled packaged
centrifugal chiller. Chillers shall have no more than two oil-
free, magnetic bearing, semi-hermetic centrifugal
compressors (no exceptions). Each compressor shall have
an integrated variable-frequency drive operating in concert
with inlet guide vanes for optimized full and part load
efficiency. On two-compressor units, the evaporator and
condenser refrigerant sides and the expansion valve shall
be common and the chiller shall be capable of running on
one compressor with the other compressor or any of its
auxiliaries inoperable or removed.
Each chiller shall be factory run-tested on an AHRI quali-
fied test stand with water at job conditions (excluding gly-
col applications). Operating controls shall be adjusted and
checked. The refrigerant charge shall be adjusted for opti-
mum operation and recorded on the unit nameplate. Units
operating with 50-Hz power shall be tested with a 50-Hz
power supply. Any deviation in performance or operation
shall be remedied prior to shipment and the init retested if
necessary to confirm repairs or adjustments.
2.3 DESIGN REQUIREMENTS
A General: Provide a complete water-cooled, semi-hermetic
oil-free centrifugal compressor water chiller as specified
herein. The unit shall be provided according to standards
indicated in Section 1.2. In general, unit shall consist of one
or two magnetic bearing, completely oil-free centrifugal
compressors, refrigerant, condenser and evaporator, and
control systems including integrated variable frequency
drive, operating controls and equipment protection
controls. Chillers shall be charged with refrigerant HFC-
134a. If manufacturer offers a chiller using any HCFC
refrigerant, manufacturer shall provide, in writing,
documentation signed by an officer of the company
assuring refrigerant availability and price schedule for a 20-
year period.
B The entire chiller system, including all pressure vessels,
shall remain above atmospheric pressure during all
operating conditions and during shut down to ensure that
non-condensables and moisture do not contaminate the
refrigerant and chiller system.
If any portion of the chiller system is below atmospheric
pressure during either operation or shut down, the
manufacturer shall include, at no charge:
1 A 20-year purge maintenance agreement that provides
parts, labor, and all preventative maintenance required
by the manufacturer’s operating and maintenance
instructions.
2 A complete purge system capable of removing non-
condensables and moisture during operation and shut-
down.
3 The manufacturer shall also include at no charge for a
period of 20 years an annual oil and refrigerant analysis
report to identify chiller contamination due to vacuum
leaks. If the analysis identifies water, acid, or other
contaminant levels higher than specified by the
manufacturer, the oil and/or refrigerant must be replaced
or returned to the manufacturer’s original specification at
no cost to the owner.
4 The manufacturer shall include a factory-installed and
wired system that will enable service personnel to readily
elevate the vessel pressure during shutdown to facilitate
leak testing.
C Performance: Refer to chiller performance rating.
D Acoustics: Sound pressure for the unit shall not exceed the
following specified levels. Provide the necessary acoustic
treatment to chiller as required. Sound data shall be
measured in dB according to AHRI Standard 575 and shall