Trane Voyager Commercial Installation, Operation And Maintenance Manual page 85
Packaged rooftop air conditioners with reliatel controls and estage 27.5 to 50 tons - 60 hz, 22.9 to 41.7 tons 81-148 kw - 50 hz
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- Installation & operation manual (152 pages) ,
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duct static pressures and over pressurization of the
space when the unit is operating in the "economizer"
mode.
The purpose of adjusting the amount of O/A damper
travel is to maintain a balance or equal pressure
between the
O/A dampers and the pressure drop of the return air
system. For models with standard or low-leak
economizers, the O/A and R/A damper linkage is
attached to a plate with a series of holes that allows the
installer or operator to modify the O/A damper travel to
compensate for various RA duct losses.
illustrates the damper assembly and
through
Table 60, p. 86
list the various damper
positions based on the air flow (CFM) and the return
duct losses (static pressure) for Downflow and
Horizontal units.
To adjust the O/A damper for the correct pressure drop:
1. Measure the return duct static pressure.
2. Enter the calculated CFM from the previous section
"Verifying Proper Airflow"
the return air damper pressure drop.
3. Add the measured return duct static pressure and
the return air damper pressure drop together to
obtain the Total Return Static Pressure. Apply this
calculation and the calculated CFM to the
appropriate
Table 57, p. 85
4. Set the drive rod swivel to the appropriate hole
according to
Table 57, p. 85
86. The units are shipped using hole "A" with no
reference to any specific operating condition.
Figure 58. Economizer (O/A) damper assembly
Table 57. 27.5 - 35 Ton downflow economizer (O/A)
damper static pressure setup
Return Air Duct Static + Return Air Damper
Static (Inches of Water)
Sys-
tem
0.2-
0.4-
0.6-
De-
0
0
sign
CFM
Drive Rod Position
8000
B
E
8500
B
D
9500
A
C
RT-SVX34R-EN
Figure 58, p. 85
Table 57, p. 85
Table 47, p. 78
to obtain
through
Table 60, p.
through
Table 60, p.
0.8-
1.0-
1.2-
0
0
0
0
E
E
E
E
E
E
E
E
E
E
E
E
Table 57. 27.5 - 35 Ton downflow economizer (O/A)
damper static pressure setup (continued)
Sys-
tem
De-
sign
0.2-
CFM
10000
10500
11000
11500
12000
12500
13000
Table 58. 27.5 - 35 Ton horizontal economizer (O/A)
Sys-
tem
0.2-
De-
sign
86.
CFM
8000
8500
9000
9500
10000
11000
11500
12000
12500
13000
13500
14000
14500
1.4-
0
E
E
E
Return Air Duct Static + Return Air Damper
Static (Inches of Water)
0.4-
0.6-
0.8-
0
0
0
0
Drive Rod Position
A
C
D
E
A
C
D
E
A
B
D
D
A
B
C
D
A
A
C
D
A
A
C
D
A
A
B
B
damper static pressure setup
Return Air Duct Static + Return Air Damper
Static (Inches of Water)
0.4-
0.6-
0.8-
0
0
0
0
Drive Rod Position
A
F
G
G
A
F
G
G
A
E
G
G
A
E
F
G
A
D
E
G
A
D
E
F
A
B
E
F
A
A
D
F
A
A
D
E
A
A
D
E
A
A
C
E
A
A
C
D
A
A
B
D
S S t t a a r r t t u u p p
1.0-
1.2-
1.4-
0
0
0
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
D
E
E
C
D
E
1.0-
1.2-
1.4-
0
0
0
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
F
G
G
F
G
G
F
F
G
E
F
G
E
F
F
85
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