TM 9-4120-402-14
5-36. BLAST DAMPER. - continued
NOTE
When installations using blast dampers have more than one air conditioner, fresh air covers
must be installed on units not equipped with blast dampers. (See figure 5-28.)
Figure 5-28. Fresh Air Cover Installed
a. Adjust.
(1) Spring balance assembly. (See figure 5-29.)
When 1.30 lbs (1 lb 5 oz) force is applied to the plunger (1), the marker (2) should be within the green color
band (3). If not, adjust as follows:
Loosen setscrew (4) and slide compression bushing (5) in or out as necessary to change spring (6)
tension. Tighten setscrew and check adjustment.
Figure 5-29. Tool Calibration
5-92
