Chief Manufacturing CMS390 - Manual (Page 5)

Installation Instructions CMS390/CMS391
5
INSTALLATION
NOTE: The CMS-390 and CMS-391 attach to a 1-1/2" NPT
threaded column in a finished ceiling with 16" on-center
(CMS-390) or 24" on-center (CMS-391) wood joists. In
addition, both the CMS-390 and CMS-391 can be
installed in line on a single joist.
1. Remove end caps from ceiling plate (A). (See Figure 1)
Figure 1
2. Drill two 1/8" pilot holes into wood joists.
3. Install ceiling plate (A) to ceiling using two 1/4-20 x 3-1/2"
lag bolts (B) and two 1/4" flat washers (C). (See Figure 2)
4. Re-install end caps onto ceiling plate (A). (See Figure 2)
Figure 2
5. Install 1-1/2" NPT threaded column (not included) into
threaded collar on ceiling plate (A).
6. Install one 10-24 x 1/4" Phillips head screw (G) into
threaded collar and tighten. (See Figure 3)
Figure 3
Security
1. For increased security, remove two set screws from ceiling
plate and replace with two 5/16-18 x 5/8" security set
screws (F). Tighten with 5/32" security hex wrench (H).
(See Figure 4)
Figure 4
2. For additional security, remove Phillips screw in threaded
collar of ceiling plate and replace with one 10-24 x 1/4"
button head security cap screw (E) through security spinner
(D). Tighten with 5/32" security hex wrench (H).
(See Figure 4)
Adjustment
To adjust position of ceiling plate, loosen adjustment set
screws, adjust plate to position, and tighten screws. (See
Figure 4)
(A)
End caps
3
4
4
( (B) x 2
(C) x 2
(A)
(G
6
(G) x 1 (F
1 (F) x 2 (F
2 (E) x 1
(A)
(D) x 1
Adjustment
Set Screws