86
RT-SVX34R-EN
Table 59.
40 - 50 Ton downflow economizer (O/A)
damper static pressure setup
Sys-
tem
De-
sign
CFM
Return Air Duct Return Air Damper
Static (Inches of Water)
0.2-
0
0.4-
0
0.6-
0
0.8-
0
1.0-
0
1.2-
0
1.4-
0
Drive Rod Position
12000
A
A
C
D
E
E
E
12500
A
A
C
D
D
E
E
13000
A
A
B
C
D
E
E
13500
A
A
B
C
D
D
E
14000
A
A
B
C
C
D
E
14500
A
A
B
B
C
D
D
15000
A
A
A
B
C
D
D
15500
A
A
A
B
C
D
D
16000
A
A
A
B
C
C
D
16500
A
A
A
B
B
C
D
17000
A
A
A
B
B
C
C
17500
A
A
A
A
B
C
C
18000
A
A
A
A
B
C
C
18500
A
A
A
A
B
B
C
19000
A
A
A
A
B
B
C
19500
A
A
A
A
B
B
B
20000
A
A
A
A
A
B
B
Table 60.
40 - 50 Ton horizontal economizer (O/A)
damper static pressure setup
Sys-
tem
De-
sign
CFM
Return Air Duct Return Air Damper
Static (Inches of Water)
0.2-
0
0.4-
0
0.6-
0
0.8-
0
1.0-
0
1.2-
0
1.4-
0
Drive Rod Position
12000
A
B
E
F
G
G
G
12500
A
B
D
E
F
G
G
13000
A
A
D
E
F
G
G
13500
A
A
D
E
F
G
G
14000
A
A
C
E
F
F
G
14500
A
A
C
D
E
F
F
15000
A
A
B
D
E
F
F
15500
A
A
B
D
E
E
F
16000
A
A
A
C
D
E
F
16500
A
A
A
C
D
E
F
17000
A
A
A
B
D
E
E
17500
A
A
A
B
D
E
E
Table 60.
40 - 50 Ton horizontal economizer (O/A)
damper static pressure setup (continued)
Sys-
tem
De-
sign
CFM
Return Air Duct Return Air Damper
Static (Inches of Water)
0.2-
0
0.4-
0
0.6-
0
0.8-
0
1.0-
0
1.2-
0
1.4-
0
Drive Rod Position
18000
A
A
A
B
C
D
E
18500
A
A
A
A
C
D
E
19000
A
A
A
A
B
D
E
19500
A
A
A
A
B
C
E
20000
A
A
A
A
B
C
D
Models with Ultra-Low Leak
Economizers
The installer can adjust the stroke of the direct drive
actuator on the O/A damper to compensate for various
R/A duct losses.
and
illustrate the damper & actuator assembly and
through
list the various O/A
actuator limit positions based on the air flow (CFM) and
the return duct losses (static pressure) for Downflow
and Horizontal units. The actuator stroke limit can be
adjusted between 33% and 100% of full stroke. 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 Air Flow (CFM) - CV or VFD's,” p.
75
to obtain 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. See
through
4. To set the actuator stroke limit:
a. Loosen the screw that secures the angle of
rotation limiter on the actuator adjacent to the
damper drive shaft clamp.
b. Move the limiter to the desired % open position
and, making sure the limiter teeth are engaged,
retighten the screw. (See
).
5. After setting the end stop, the actuator needs to be
cycled through its auto-adapt feature to re-scale the
control range. With 24 VAC power applied to the
actuator, turn the control signal reversing switch
forward and back again two times. Within a few
seconds, the actuator will cycle itself to the new
limiter position and then back to zero. This process
may take up to 5 minutes. The actuator will then be
set to respond to the 2-10 VDC control signal to
cycle within the new range of rotation set by the
limiter. Verify that the control signal reversing
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