McQuay WDC

Product Manual PM WSC/WDC 73
1.7 MAINTENANCE
Maintenance of the chillers shall be the responsibility of the owner with the following exceptions:
A. The manufacturer shall provide the first year scheduled oil and filter change if required.
B. The manufacturer shall provide first year purge unit maintenance if required.
PART 2 — PRODUCTS
2.1 ACCEPTABLE MANUFACTURERS
A. McQuay International
B. (Approved Equal)
2.2 UNIT DESCRIPTION
Provide and install as shown on the plans a factory assembled, charged, and run-tested water-cooled
packaged chiller. Each unit shall be complete with two single-stage hermetic centrifugal compressors
each having independent lubrication and control systems, factory mounted starters, and isolation
valves. The evaporator, condenser, and refrigerant control device of each unit shall be common to the
compressors. The chiller unit shall be capable of running on one compressor with the other
compressor or any of its auxiliaries removed.
2.3 DESIGN REQUIREMENTS
A. General: Provide a complete water-cooled dual hermetic compressor centrifugal water chiller
as specified herein. Machine shall be provided according to standards, Section 1.2. In
general, unit shall consist of two compressors, refrigerant condenser and evaporator, two
lubrication systems, two starters and two control systems.
Note: Chillers shall be charged with a refrigerant such as HCFC-134a, not subject to the
Montreal Protocol and the U. S. Clean Air Act.
B. Performance: Refer to schedule on the drawings. The chiller shall be capable of stable
operation to five percent of full load with standard ARI entering condensing water relief
without hot gas bypass.
C. Acoustics: Sound pressure levels for the unit shall not exceed the following specified levels.
Provide the necessary acoustic treatment to chiller as required. Sound data shall be measured
according to ARI Standard 575-87. Data shall be in dB. Data shall be the highest levels
recorded at all load points. Test shall be in accordance with ARI Standard 575.
Octave Band
63 125 250 500 1000 2000 4000 8000 dba
2.4 CHILLER COMPONENTS
A. Compressors:
1. Unit shall have two single-stage hermetic centrifugal compressors. Casing design
shall ensure major wearing parts, main bearings and thrust bearings are accessible
for maintenance and replacement. Lubrication system shall protect machine during
coast down resulting from a loss of power.