Sterlco GP Series 5-15 HP Portable Chillers - Manual (Page 81)

GP Series Portable Chillers Chapter 7: Appendix 81 of 93
Notes:
• Customer use of ductwork requires the high pressure fan option.
• Allow 30 in. (77 cm) minimum clearance around the chiller footprint to facilitate free passage of
cooling air and service accessibility.
• Figure 20 shows the pressure loss per foot of ductwork. Calculate the total equivalent length before
using the data below.
• Support ductwork from the building structure, not off of the chiller.
• Back draft damper to outside must be closed at all times when fan/blower is not operating. Size the
damper so that the pressure drop across is no greater than 0.2 in WG (50 Pascal) at the rated output.
• Chillers are designed to operate at a condensing entering air temperature of 60ºF (16ºC) minimum
without optional Variable Frequency Drive.
Figure 20 - Loss of Pressure through round duct - inches of water column per equivalent foot
60 hz Condenser Fan Flow Rate (cfm / cmm) 50 hz Condenser Fan Flow Rate (cfm / cmm)
Nominal
Duct
Diameter
(in / cm)
GPAC-20 GPAC-30 GPAC-40 GPAC-50 GPAC-20 GPAC-30 GPAC-40 GPAC-50
4230 / 120
6343 /
180
8458 /
240
12687 /
360
3525 /
100
5286 /
150
7048 /
200
10573 /
300
18 / 45 0.003 0.007 0.013 0.03 0.002 0.005 0.009 0.020
20 / 50 0.002 0.005 0.008 0.02 0.001 0.003 0.005 0.012
22 / 55 0.001 0.003 0.005 0.01 0.002 0.003 0.007
24 / 60 0.002 0.003 0.007 0.001 0.002 0.005
26 / 65 0.001 0.002 0.004 0.001 0.003
28 / 70 0.001 0.003 0.002
30 / 75 0.002 0.002
32 / 80 0.002 0.001
36 / 90 0.001
Note: 1 inch of water column = 250 Pascal