Nordyne O4LD-091A-12-RA Installation, Operation And Maintenance Manual page 12

Table A-5 Direct Drive Blower Set-Up
Blower Set-Up Cooling Capacity
0.20 in. w.c. 0.50 in. w.c. CFM
Furnace Model Blower | Speed Motor Speed Motor Tons Power Range
O4LD-070A-12-RA 10-10T
O4LD-070A-14-RA-DV DD Low 1/2 HP | Med-Low] 1/2 HP 3 1/2 HP | 700-1600
O4LD-091A-12-RA 10-10T
O4LD-091A-14-RA-DV DD Med-Low | 1/2 HP | Med-Low | 1/2 HP 3 1/2 HP | 700 — 1600
O4LD-105A-12-RA 10-10T Med-
O4LD-105A-14-RA-DV DD Med-Low | 1/2 HP High 1/2 HP 3 1/2 HP | 700 — 1600
Table A-6 Direct Drive Blower Characteristics
CFM
Furnace Model Blower itil er AT Speed External Static Pressure — Inches w.c.
0.2 0.3 0.4 0.5 0.6
O4LD-A-12-RA High 1722 1645 1516 1462 1375
O4LD-A-14-RA-DV Med- 1604 1545 1473 1383 1302
10-10T ° High
DD 1/2 HP 7.1 70°F Med-
L 1147 1133 1106 1063 1013
070 - 105 ow
Low 747 738 720 702 669
TIP: These Formulae will assist with the design of the ductwork and the determination of
aifflow delivery:
CFM = Bonnet Qutgut '(1.085 x System Temperature Rise (AT)
System Temperature Rise (AT) = Bonnet Output / (1.085 x CFM)