CTC-1653/1654
1
Installation Guide
Installation Guide
2/3-Pipe, 2-Temperature, Pneumatic Thermostats, w/ Indexing
CTC-1653/1654
Mounting
Mount the thermostats on an inside wall away from
direct sunlight, heat sources, windows, air vents, and
air circulation obstructions (curtains, furniture, etc.).
Choose the location best suited for measuring the
average room temperature. Units may be mounted
horizontally or vertically to either a 2" x 4" electrical
box or a hollow wall.
Electrical Box Mounting
1. Attach the HMO-5024/5026/5030/5031 backplate
to the box with the two 6-32 screws supplied.
2. Level the box using the slot in the backplate.
3. Fit the aluminum plate into the recess.
4. Pass the 3/32" ID tubing through access hole.
5. Make connections.
See the Connections section.
6. Mount the thermostat to backplate with two 6-20
x 2" screws supplied with thermostat.
Hollow Wall Mounting
Thermostats may be directly mounted on walls up to
5/8" with the HMO-5023 kit.
1. Using the template, printed on the package, make
a 2-11/16" x 1-1/2" cutout.
2. Loosely mount the bracket to the thermostat with
two 6-32 x 2" screws supplied.
3. Make connections.
See the Connections section.
4. Insert the bracket diagonally through the wall.
5. Center the thermostat and tighten screws.
Scale Plate
Adjustments must be made with the scale plate
removed. Complete adjustments before installing the
scale plate.
1. Remove all gauge tap rubber cap(s).
2. Slide plate under the setpoint indicator(s).
3 Insert retaining pins (two supplied), twisting to
lock into place.
4
.
Replace gauge tap cap(s).
Setpoint Options
• If setpoint indicators are not needed, simply snip
off the indicator(s) with wire cutters.
• Limit or lock the range of the setpoint(s) by
installing setpoint stops (HFO-0027) in the slider
track.
Cover Installation
1. Check that the unit is mounted securely and all
gauge tap cap(s) or accessories are installed.
2. Place longer, tapered ends of push-button into the
two holes in the thermostat.
3. Align cover over push buttons, so that short ends
protrude.
4. Slide the cover over the base.
5. Using a 1/16" hex wrench, turn both cover
mounting screws on the thermostat base CCW
(outward) until cover is secured.
NOTE: If used,
blank covers
require the removal of
the setpoint thumb adjusters. Insert a small
screwdriver in the slot between the thumb
adjuster and the cam and pry apart. Discard
the adjuster.
Mounting
1
Electrical Box Mounting 1
Hollow Wall Mounting 1
Scale Plate
1
Setpoint Options
1
Cover Installation 1
Connections
2
Remote Indexing 2
Maintenance
2
Adjustments and Calibration 3
Calibration
3
Throttling Range
3
Accessories
3
