York YMC2 - Ratings

JOHNSON CONTROLS
FORM 160.84-EG1 (617)
8
Ratings
AHRI CERTIFICATION PROGRAM
YORK YK chillers have been tested and certified by Air-Conditioning, Heating and
Refrigeration Institute (AHRI) in accordance with the latest edition of AHRI Standard
550/590 (I-P). Under this Certification Program, chillers are regularly tested in strict
compliance with this Standard. This provides an independent, third-party verification
of chiller performance. Refer to the AHRI site at: http://www.ahrinet.org/water_
chilling+packages+using+vap or+compression+cycle+_water_cooled_.aspx for complete
Program Scope, Inclusions, and Exclusions as some options listed herein fall outside the
scope of the AHRI certification program. For verification of certification, go to the AHRI
Directory at www.ahridirectory.org.
COMPUTERIZED PERFORMANCE RATINGS
Each chiller is custom-matched to meet the individual building load and energy require-
ments. A variety of standard heat exchangers and pass arrangements are available to
provide the best possible match. Computerized ratings are available through each John-
son Controls sales office. Each rating can be tailored to a specific job requirement, and is
part of the AHRI Certification Program.
Additionally, computerized ratings are able to provide detailed hourly weather used to
analyze chiller performance for each possible combination. The JCI rating software will
incorporate installation location weather data and user defined utility rates to approximate
the total Annual Energy Cost (AEC) to provide an in depth analysis of energy consumption
when comparing chiller efficiencies.
OFF-DESIGN PERFORMANCE
Since the vast majority of its operating hours are spent at off-design conditions, a chiller
should be chosen not only to meet the full load design, but also for its ability to perform ef-
ficiently at lower loads and lower tower water temperatures. It is not uncommon for chillers
with the same full load efficiency to have an operating cost difference of over 10% due to
differences in off-design (part-load) efficiencies.
TAKE ADVANTAGE OF COLDER COOLING TOWER WATER TEMPERATURES
The YMC² chillers have been designed to take full advantage of colder cooling tower
water temperatures, which are naturally available during most operating hours. Consider-
able energy savings are available by letting tower water temperature drop, rather than
artificially holding it above 75°F (24°C), especially at low load, as some chillers require.