GDS8 Technical Manual
BLOWER PERFORMANCE SPECIFICATIONS
14
NOTES:
• CFM in chart is without filter(s). Filters do not ship with this furnace, but must be provided by the installer.
• All furnaces ship as hig-speed cooling. Installer must adjust blower cooling speed as needed.
• For most jobs, about 400 CFM per ton when cooling is desirable
• INSTALLATION IS TO BE ADJUSTED TO OBTAIN TEMPERATURE RISE WITHIN THE RANGE SPECIFIED ON THE RATING PLATE.
• The chart is for information only. For satisfactory operation, external static pressure must not exceed values shown on the rating plate. The shaded area
indicates ranges in excess of maximum static pressure allowed when heating.
• The dashed (---) areas indicate a temperature rise not recommended for this model.
• At higher altitudes, a properly de-rated unit will have approximately the same temperature rise at a particular CFM, while ESP at the CFM will be lower.
GDS8***B*
Tons AC
at 0.5" 0.6 0.7 0.8
ESP CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM CFM CFM
HIGH 3.0 1353 ---- 1290 ---- 1246 ---- 1199 25 1149 26 1116 1116 1099
GDS80403A*B* MED 2.5 1183 25 1113 27 1098 27 1052 28 1039 29 1006 1012 969
MED-LO 2.0 980 30 946 31 920 32 900 33 896 33 885 855 804
LOW 1.5 778 38 762 39 738 40 746 40 738 40 717 696 678
HIGH 3.0 1290 34 1236 36 1194 37 1166 38 1176 38 1166 1108 1029
GDS80603A*B* MED 2.5 1139 39 1090 41 1035 43 1063 42 1063 42 1020 962 895
MED-LO 2.0 962 46 927 48 925 48 941 47 909 49 877 834 779
LOW 1.5 787 56 776 57 763 58 744 60 723 ---- 690 641 581
HIGH 4.0 2128 ---- 2063 ---- 2001 ---- 1927 ---- 1824 ---- 1726 1628 1529
GDS80804B*B* MED 3.5 1840 ---- 1788 ---- 1745 ---- 1689 35 1625 36 1550 1470 1364
MED-LO 3.0 1602 37 1558 38 1543 38 1493 40 1455 41 1402 1328 1239
LOW 2.5 1277 46 1252 47 1244 48 1229 48 1214 49 1179 1141 1079
HIGH 5.0 2405 ---- 2361 ---- 2250 ---- 2161 ----- 2037 36 1937 1808 1689
GDS81005C*B* MED 4.0 1880 39 1838 40 1794 41 1734 43 1677 44 1568 1510 1401
MED-LO 3.5 1659 45 1630 45 1587 47 1537 48 1492 50 1445 1368 1287
LOW 3.0 1472 50 1454 51 1404 53 1366 54 1326 56 1300 1228 1139
(CFM & Temperature Rise vs. External Static Pressure)
0.1 0.2 0.3 0.4 0.5
Model
Motor
Speed
EXTERNAL STATIC PRESSURE (Inches Water Column)