T
RUE
RH
Series HT-670x Humidity Transmitters Installation Instructions
3
Surface Mounting: Special Tools Needed
•
hole saw with 1-3/8 in. (35 mm) diameter blade
•
1/16 in. (1.5 mm) Allen wrench or T-4000-119
Allen-head adjustment tool
•
drill with 1/8 in. (3 mm) drill bit
To mount the surface model to drywall, refer to
Figure 5 and proceed as follows:
1. Bend the top and bottom edges of mounting base
at the perforations until they break off.
(See Figure 4.)
2. Drill a 1-3/8 in. (35 mm) hole in the surface where
the unit is to be mounted, and pull the wiring
through the drilled hole.
3. Mark the location of the two mounting screws, and
drill the holes.
4. Insert the spring clips on each side of the drilled
1-3/8 in. (35 mm) hole, and use the spacers if
needed as shown in Figure 5. Do not use the
spacers for 5/8 in. (16 mm) drywall.
Note:
For replacement spring clips, spacers, and
screws, order the ACC-DWCLIP-0 Drywall Clip
Mounting Kit. (See Table 1.)
Base
Cover
Screw
Cover
Figure 4: Removing the Breakaway Tabs
6. Pull the wiring through the base of the unit.
7. Center the two holes in the base over the
two drilled holes, and fasten the base to the
drywall using the No. 6 screws provided.
(See Figure 5.)
8. Place the bottom edge of the cover against the
bottom lip of the base, and rotate it up onto the
base as shown in Figure 3.
9. Tighten the cover screw.
Once installed, the HT-670x cannot be removed from
the wall unless the cover screw is loosened as
described in Figure 1.
IMPORTANT:
To prevent drywall damage, do
not overtighten the screws.
1-3/8 in.
(35 mm)
Hole
Drywall
Spacer (2) for
3/8 in. (9.5 mm) and 1/2 in.
(12.7 mm) Thick Drywall
1-3/8 in.
(35 mm)
Hole
Spring
Clip (2)
Drywall
Drywall
Spring
Clip (2)
Base
No. 6-20 x 1.25 in.
Pan-head
Tapping Screw (2)
Figure 5: Surface Mounting to Drywall