Two-Pipe, Single-Setpoint, Pneumatic, Room Thermostats
CTC-1621/1622
Installation Guide
Mounting
Location
For optimum performance, the thermostat must be mounted on an interior wall and away from heat sources, sunlight, windows, air vents, and air circulation obstructions (e.g., curtains, furniture). Units may be mounted horizontally or vertically to either a 2" x
4" electrical box or a hollow wall.
1. Using the template printed on the HMO-5023 package, make a 2-11/16" x 1-1/2" cutout.
2. Loosely mount the bracket to the thermostat with the 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 the screws.
CTC-1621/1622 Back
Scale Plate
All adjustments must be made with the scale plate removed. Complete adjustments before installing the scale plate. (See the Adjustments section.)
1. Remove the gauge tap’s rubber cap.
2. Slide the scale plate under the setpoint indicator.
3 Insert the retaining pins (two supplied), twisting to lock into place.
4. Reinstall the gauge tap’s rubber cap.
Setpoint Options
If the setpoint indicator is not needed, simply snip off the indicator with a wire cutter. Limit or lock the range of the setpoint by installing setpoint stops
(HFO-0027) in the slider track.
Electrical Box Mounting
1. Attach the desired HMO-50xx 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 the backplate with two
6-20 x 2" screws supplied with the thermostat.
HMO-50xx
Hollow Wall Mounting
NOTE: Thermostats may be mounted on hollow walls up to 5/8" with the HMO-5023 kit.
Cover
Covers are available in two styles:
♦
Window-insert covers include a symbol-coded
label strip (HPO-1320) for setpoint indication.
Apply the label in the recessed area underneath the window.
♦
Blank covers require the removal of the setpoint thumb adjuster. Insert a small screwdriver in the slot between the thumb adjuster and the cam and pry apart. Discard the adjuster.
To install a cover:
1. Ensure the thermostat is mounted securely and the gauge tap cap and accessories are installed.
2. Slide the cover over the base.
3. Using a 1/16" hex wrench, turn both cover mounting screws on the thermostat base CCW
(outward) until the cover is secured. (See the illustration in the Adjustments section.)
CTC-1621/1622 1 Installation Guide
Connections
The CTC-1611/1612 requires an HFO-0028 tubing
kit.
1. Connect the Main Air to Port M.
2. Connect the Branch Air to Port B.
3. Connect the open side of the Branch Air with tubing to the final device actuator (DA unit for
the CTC-1621 or RA unit for the CTC-1622).
Adjustments
Throttling Range (TR)
Throttling range is the temperature required to change the thermostat output pressure from 3–15 psi.
All CTC-1600 series thermostats are factory-set for a 3° F throttling range. The approximate TR setting is stamped on each lever in both °F and °C. If it is necessary to change this setting, reverify calibration after adjustment.
1. Remove the scale plate (see the Scale Plate section).
2. Slide the black TR adjuster to appropriate value/ location. The hole in the TR adjuster fits a 1/16" hex wrench. Gently rotate the adjuster back and forth while sliding. Do not turn excessively!
3. Rotate the TR adjuster back to a “square” position if needed after adjustment.
4. Reinstall the scale plate.
NOTE: TR
ADJUSTMENT
NOT SHOWN
(UNDER COVER)
Maintenance
Remove dust as necessary from the slots. Clean the window with a soft, damp cloth and mild soap.
Care should be taken to keep the unit clean
from dust during installation. Each component is designed for dependable, long-term reliability, and performance. Careful installation will also ensure long-term reliability and performance.
Calibration
These thermostats are factory-calibrated and do not require further calibration at installation. Should it be necessary to change calibration, perform the following steps:
1. Remove the cover and gauge tap rubber cap.
2. Install a gauge on the gauge tap using 3/32" ID tube.
3. Measure the ambient temperature with an accurate thermometer.
4. Move the setpoint slider to the measured ambient temperature.
5. Use a 1/16" hex wrench and turn the calibration adjustment until the test gauge indicates the desired pressure. (Clockwise rotation decreases the output pressure.)
6. Replace the gauge tap rubber cap after calibrating.
7. Place the setpoint slider to the desired temperature and replace the cover.
Important Notices
The material in this document is for information purposes only. The contents and the product it de-
scribes are subject to change without notice. KMC
Controls, Inc. makes no representations or warranties with respect to this document. In no event shall
KMC be liable for any damages, direct or incidental, arising out of or related to the use of this document.
Additional Resources
For specifications and accessories, see the CTC-1621/1622 Data Sheet on the KMC web site.
KMC Controls, Inc.
19476 Industrial Drive
New Paris, IN 46553
574.831.5250
www.kmccontrols.com; [email protected]
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