Trane SFHJ090-162 - To Adjust the Outside Air Damper Travel

Unit Startup
144 RT-SVX24J-EN
measure the return static pressure at the location
determined in step 1.
9. Press the STOP key at the Human Interface Module in
the unit control panel to
stop the fan operation.
10. Open the field supplied main power disconnect switch
upstream of the rooftop
unit. Lock the disconnect
switch in the “Open” position while working on the
dampers.
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 Table 43,
p. 146 for the unit size and operating CFM.
To relocate the outside air/return air connecting rod to
balance the outside air damper
pressure drop against the
return static pressure, use 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 swi vel “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.
Figure 102. Outside air and return air damper assembly
Outside air damper level
Conguration B
Conguration A
All Top view
Jackshaft lever
Economizer Linkage Adjustment