York ECO R-22 - Manual (Page 11)

FORM 100.50-EG3 (802)
11 YORK INTERNATIONAL
6. Required total and sensible capacities are 991 mbh
and 681 mbh, respectively. The total capacity is 82.6
tons, therefore a model YPAL085 is selected. Use
the Cooling Performance Data in Table 9. Locate
the table with the correct ambient air temperature.
Next, trace the 80°F entering air dry bulb tempera-
ture to match the 24,000 cfm and 67°F entering
wet bulb temperature condition. The resulting con-
ditions are, from the table, 996.5 mbh total cooling
capacity and 688.9 mbh sensible cooling capacity.
7. The high heat option for the YPAL085 provides
900 mbh of heat capacity with an input of 1,125
mbh. This is sufficient for the 875 mbh heating
requirement.
8. Determine net cooling and heating capacities if
required.
Net Cooling Capacity (NCC)
mbh = 996.5 mbh – 71.3 mbh
mbh = 925 mbh
Net Sensible Heat Capacity (NSHC)
mbh = 688.9 mbh - 71.3 mbh
mbh = 618 mbh
Net Heating Capacity (NHC)*
mbh = 875 mbh + 71.3 mbh
mbh = 946 mbh
* Note, net heating capacity is approximate because this example
uses the bhp calculated based on a wet evaporator coil (for
cooling mode).