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1.26 (32)
4.65
(118)
Figure 3: TCN-890x Wallplate Dimensions, in. (mm)
Mounting
The TCN-890x thermostat can be either surface or
wallbox mounted.
Follow the instructions for removing the cover and
proceed to either the Surface Mounting section or the
Wallbox Mounting section.
Note:
All TCN-890x models include a U.S. wallbox
mounting base kit. Do not use the kit if surface
mounting the module.
Removing the Cover
To remove the cover from the base, insert a 1/16 in.
(1.5 mm) Allen wrench or T-4000-119 Allen-head
Adjustment Tool into the small hole located in the
center of the top of the cover. While pressing down
gently on the tool, pull the cover away from the base
until it is free. (See Figure 4.)
Insert Allen-head
adjustment tool
or Allen wrench here.
Cover
Figure 4: Removing the Cover from the Base
2
TCN-890x Electronic Room Thermostats Installation Instructions
3.07 (78)
3.28
(83.4)
Surface
Mount
Base
Surface Mounting
To surface mount the TCN-890x:
1. Pull the wiring through the wall. (Figure 5.)
2. Place the surface mount base against the wall,
and mark the screw holes using the base as a
template.
3. To attach the base to the wall:
a. drill two 5/16 in. (8 mm) holes
b. insert the plastic wall anchors
c. position the surface mount base
d. drive the screws
IMPORTANT:
Use an ACC-INSL-1 Foam Pad
Kit to help reduce drafts entering the unit. Drafts can
result in false temperature readings.
1. Wire to appropriate terminals as described in the
Wiring section.
2. Set the potentiometers and
Reverse Acting/Direct Acting (RA/DA) outputs
before reassembling the thermostat. Follow the
procedures in the Setup and Adjustments section.
Wall Anchors (2)
No. 8
Screws (2)
Drywall
a
Figure 5: Installing a Surface-Mounted TCN-890x
Reassembling the Surface-Mounted TCN-890x
To reassemble the TCN-890x, place the cover against
the bottom edge of the surface mount base, and push
the upper part of the cover until it clicks firmly into
place. (See Figure 6.)
Surface
Mount
Base
Surface
Mount
Base
c
b
b
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