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Note: Gravity will cause the damper to close. Support
or secure the damper blades while removing the
actuator to prevent unexpected damper rotation.
11. Compare the static pressure reading to the static
pressure ranges and linkage positions in
110
for the unit size and operating CFM.
Relocate the outside air/return air connecting rod to
balance the outside air damper pressure drop against
the return static pressure, using the following steps. If
no adjustment is necessary, proceed to step 17.
12. Remove the drive rod and swivel from the crank arm(s).
If only one hole requires changing, loosen only that
end.
13. Manually open the return air dampers to the full open
position.
14. Manually close the outside air dampers.
15. Reattach the drive rod and swivel to the appropriate
hole(s). The length of the drive rod may need to be
adjusted to align with the new hole(s) location. If so,
loosen the lock nut on the drive rod against the swivel.
Turn the swivel "in" or "out" to shorten or lengthen the
rod as necessary. For some holes, both ends of the rod
may need to be adjusted.
16. Tighten the lock nut against the swivel(s).
17. Plug the holes after the proper CFM has been
established.
RT-SVX072D-EN
Figure 98. Outside air and return air linkage
adjustment (standard and low leak dampers only)
Table 51, p.
Figure 99. Outside air linkage adjustment (ultra low
leak dampers only)
Top View
RETURN AIR
DAMPERS
3
4
1
5
2
6
FILTER
SECTION
5
2
1
3
4
6
7
Unit Start-up
OUTSIDE AIR
DAMPERS
8
7
9
Air Flow
8
109
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