JOHNSON CONTROLS
FORM 150.26-EG1 (116)
18
GUIDE TO SELECTION
Complete water chilling capacity ratings for YORK YCWL chillers are shown on the follow-
ing pages to cover the majority of job requirements. For any application beyond the scope
of this Engineering Guide, consult your nearest Johnson Controls office.
Selection Rules
1. Ratings - All YCWL ratings are in accordance with AHRI Standard 550/590, at the
AHRI standard condi tions. Ratings not at standard AHRI conditions are rated in accor-
dance with AHRI rating procedures. These ratings may be interpolated but should not
be extrapolated.
EVAPORATOR CORRECTION FACTORS
FF=TEMP SPLIT
0.00010 0.00025
TONS COMPR KW TONS COMPR KW
6 0.976 0.996 0.969 0.997
8 0.990 0.999 0.960 0.996
10 1.000 1.000 0.991 0.999
12 1.009 1.001 0.999 1.000
14 1.017 1.002 1.007 1.001
2. Cooling Water Quantity - Ratings are based on 10ºF chilled water range with the
evaporator at sea level. Use the chilled water correction factors (below) for other
ranges except as limited by water pressure drop, minimum or maximum water ows
for the evaporator.
CONDENSER CORRECTION FACTORS
FF=TEMP SPLIT
0.00025 0.00050
TONS COMPR KW TONS COMPR KW
6 1.020 0.963 1.014 0.974
8 1.010 0.982 1.019 0.990
10 1.000 1.000 0.995 1.010
12 0.990 1.019 0.985 1.029
14 0.980 1.040 0.975 1.048
Note: Temperature split factors @ 85ºF Entering Condenser Water Temp (ECWT)
3. Condenser Water Quantity – Ratings are applicable from 2 to 4 GPM/Ton. Use
the condenser water correction factors (below) for different ranges except as limited
by water pressure drop or minimum or maximum water ows for the condenser. Us-
ing the heat rejection (MBH), the Condenser GPM is calculated as follows:
4. FOULING FACTORS – Ratings are based on 0.0001 evaporator and 0.00025 con-
denser fouling factor. For other fouling factors, consult the table below or contact
your Johnson Controls representative.
Selection Data
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