Specifications

4 JOHNSON CONTROLS

FORM 160.80-EG1 (511)

Ratings

AHRI CERTIFICATION PROGRAM

The performance of YORK chillers is certied to the Air

Conditioning and Refrigeration Insti tute (AHRI) complying

with the certication sections of the latest issue of AHRI

Standard 550/590. Under this Certi cation Program,

chillers are regularly tested in strict compliance with this

Standard. This provides an inde pendent, third-party veri-

cation of chiller performance.

COMPUTERIZED PERFORMANCE RATINGS

Each chiller is custom-matched to meet the individual

building load and energy requirements. A large number

of standard heat exchangers and pass arrangements are

available to provide the best possible match.

It is not practical to provide tabulated performance for

each combination, as the energy requirements at both full

and part- load vary signicantly with each heat exchanger

and pass arrangement. Computerized ratings are avail-

able through each Johnson Controls sales ofce. These

ratings can be tailored to specic job requirements, and

are part of the AHRI Certication Program.

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ciently at lower loads and lower tower water

temperatures. It is not uncommon for chillers with the

same full-load KW/TON to have an operating cost differ-

ence of over 10% due to part-load operation.

Part-load information can be easily and accurately gener-

ated by computer. And because it is so important to an

owner’s operating budget, this informa tion is now standard

within the AHRI Certi cation Program in the form of an

Integrated Part-Load Value (IPLV), and Non-Standard

Part-Load Value (NPLV).

The IPLV / NPLV formulas from AHRI Standard 550/590

closely track chiller operations, and provide a more ac-

curate indication of chiller performance than the previ-

ous IPLV/APLV formula. A more detailed analysis must

take into account actual build ing load proles, and local

weather data. Part-load performance data should be ob-

tained for each job using its own design criteria.

Rated in accordance

with the latest issue of

AHRI Standard 550/590.