Startup
Table 48. 40 - 50 Ton Downflow Unit Economizer (O/A) Damper Static Pressure Setup
System
Design
CFM
12000
12500
13000
13500
14000
14500
15000
15500
16000
16500
17000
17500
18000
18500
19000
19500
20000
Table 49. 40 - 50 Ton Horizontal Unit Economizer (O/A) Damper Static Pressure Setup
System
Design
12000
12500
13000
13500
14000
14500
15000
15500
16000
16500
17000
17500
18000
18500
19000
19500
20000
96
Return Air Duct Static +
Return Air Damper Static
(Inches of Water)
0.20
0.40
0.60
Drive Rod Position
A
A
C
A
A
C
A
A
B
A
A
B
A
A
B
A
A
B
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
Return Air Duct Static + Return Air Damper
Static
(Inches of Water)
CFM
0.20
0.40
0.60
Drive Rod Position
A
B
E
A
B
D
A
A
D
A
A
D
A
A
C
A
A
C
A
A
B
A
A
B
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
0.80
1.00
1.20
1.40
D
E
E
E
D
D
E
E
C
D
E
E
C
D
D
E
C
C
D
E
B
C
D
D
B
C
D
D
B
C
D
D
B
C
C
D
B
B
C
D
B
B
C
C
A
B
C
C
A
B
C
C
A
B
B
C
A
B
B
C
A
B
B
B
A
A
B
B
0.80
1.00
1.20
1.40
F
G
G
G
E
F
G
G
E
F
G
G
E
F
G
G
E
F
F
G
D
E
F
F
D
E
F
F
D
E
E
F
C
D
E
F
C
D
E
F
B
D
E
E
B
D
E
E
B
C
D
E
A
C
D
E
A
B
D
E
A
B
C
E
A
B
C
D
RT-SVX34C-EN