Selection Data - York STYLE A YCWS User Manual

Selection Data

GUIDE TO SELECTION
Complete water chilling capacity ratings for YORK YCWS
chillers are shown on the following pages to cover the
majority of job requirements. For any application be-
yond the scope of this Engineering Guide, consult your
nearest YORK Office.
SELECTION RULES
1. RATINGS - YCWS 200, 230 380, 460 & 575-3-60 rat-
ing are certified in accordance with ARI standard 550/
590, at the ARI standard condition. Rating not at stan-
dard ARI conditions are rated in accordance with ARI
rating procedures. These ratings may be interpolated
but should not be extrapolated.
2. COOLING WATER QUANTITY - Ratings are based
on 10ºF chilled water range. Use the chilled water
correction factors (below) for other ranges except as
limited by water pressure drop, minimum or maximum
water flows for the cooler.
3. CONDENSER WATER QUANTITY – Rating are ap-
plicable from 2 to 4 gpm/ton as limited by water pres-
sure drop or minimum or maximum water flows for
the condenser. Using the tabulated MBH, the Cond.
GPM is calculated as follows:
Cond. GPM =
4. FOULING FACTORS – Rating are based on 0.0001
evaporator and 0.00025 condenser fouling factor. For
other fouling factors, consult the table below or con-
tact your YORK representative.
EVAP FOULING FACTORS
0.0001
Temp Compr
Tons
Split kW
6 0.9692 1.0015
8 0.9849 1.0008
10 1.0000 1.0000
12 1.0133 0.9993
14 1.0248 0.9986
Note: Temperature split factors @ 44ºF Leaving Chilled Liquid Temp
(LCLT)
12
MBH x 2
Cond. Water Range (ºF)
x 0.00025
Compr
Tons
kW
0.9972 1.0001
0.9980 1.0001
0.9982 1.0001
0.9978 1.0001
0.9979 1.0001
COND FOULING FACTORS
0.00025
Temp
Compr
Tons
Split
kW
8 0.9998 1.0004
10 1.0000 1.0000
12 1.0001 0.9998
14 1.0001 0.9998
Note: Temperature split factors @ 95ºF Leaving Condenser Water
Temp (LCWT).
METHOD OF SELECTION
If the duty requires a 10ºF range on both the cooler and
condenser, see "Ratings". For water ranges other than
10ºF, use the following procedure.
1. Determine capacity required from the following for-
mula
GPM x Chilled Water Range (ºF)
Capacity (tons) =
2. After applying any fouling factor corrections, the ac-
tual condenser heat rejection may be determined as
follows:
Heat Rejection (Btuh) = (Tons x 12,000) + (kW x 3415)
Heat Rejection (MBH) =
= (Tons x 12) = (kW x 3.415)
3. Determine condensing water requirements for water
cooled models as follows:
Heat Rejection (MBH) x 1000
Condenser Tons =
Cond. Water GPM =
Or combine the two formulas:
Cond. Water GPM =
x 0.0005
Compr
Tons
kW
0.9957 1.0072
0.9959 1.0068
0.9961 1.0065
0.9965 1.0060
24
Heat Rejection (Btuh)
1000
15,000
Condenser Tons x 30
Condenser Water Range (ºF)
MBH x 2
Condenser Water Range (ºF)
YORK INTERNATIONAL