KMC Controls CTC-4001, CTC-4004 Installation Manual
3-Way, Switching, Duct Thermostat
Installation Guide
CTC-4001/4004
Mounting
1. Drill a 5/8" diameter hole in the duct work.
2. Insert the thermostat in the duct.
3. Secure with sheet metal screws fastened through
the two 3/16" (5 mm) mounting holes.
Connections
General
The CTC-4001 and CTC-4004 are not snap-acting.
The unit must be below or above the setpoint range
to completely switch. At temperatures within the
setpoint range, all three ports are connected.
The setpoint adjustment allows ranges to be moved
up 5° F or down 10° from the default values.
The CTC-4001 and CTC-4004 use 1/4" (6 mm) OD
polyethylene tubing for all connections. Make necessary connections based on the model.
CTC-4001
• Port C is the (ltered) common
• Port A is closed above 75° F (24° C)
• Port B is closed below 70° F (21° C)
NOTE: For the CTC-4001, when temperature
is below 70° F (21° C), ports A and C
are connected, but B is blocked. When
temperature is above 75° F (24° C), ports
B and C are connected, but A is blocked.
Between 70 and 75° F, all ports are
connected.
CTC-4001/4004 1 Installation Guide
CTC-4004
• Port C is the (ltered) common
• Port A is closed above 70° F (21° C)
• Port B is closed below 65° F (18° C)
NOTE: For the CTC-4004, when temperature
is below 65° F (18° C), ports A and C
are connected, but B is blocked. When
temperature is above 70° F (21° C), ports
B and C are connected, but A is blocked.
Between 65 and 70° F, all ports are
connected.
Adjustments and Calibration
Sample Application
Minor adjustment is required if a dierent setpoint is
desired.
1. Turn the setpoint adjustment clockwise to
increase (counter-clockwise to decrease). The
range may be moved up 5° F or down 10° F.
2. Obtain two thermometers and two containers
of tempered liquid that match the high and low
temperatures of the new setpoint span.
3. Move the CTC-4001/4004 thermostat between
the containers, allowing sucient time for the
element to stabilize.
4. With the element in the “low” container, turn the
setpoint adjustment until port B is closed to port
C.
5. Then move it to the “high” container and verify
that port A is closed to port C.
6. Minor adjustment will be required in both
containers to obtain the desired 5° switching
band.
CTC-16xx
Thermostat (DA)
M B
M
M
RCC-1012
Reversing Relay
CTC-400x Duct Thermostat
will pass a DA or RA signal
to the CSC VAV Volume
Controller when the
airstream temperature
switches between heating
and cooling
CTC-400x mounted in
the airstream (inlet
side of the VAV box)
To load or CSC Volume
Controller thermostat input
NOTE: If the ltered port C on the CTC-400x is
used as an “output” (as shown in this
example), the air to ports A and C must be
from a ltered source or ltered with an
external lter (such as an HFO-0006).
NOTE: The CTC-400x is for low-volume
applications. Ports A and B are each
restricted with a 0.015" nozzle.
Maintenance
Port C has a non-replaceable built-in lter to prevent
dirt from hindering the switching action of ports
A and B. If the lter becomes clogged, replace the
CTC-4001/4004 thermostat.
No routine maintenance is required. 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.
CAUTION
Pneumatic devices must be supplied with
clean, dry control air. Any other medium (e.g.,
oil or moisture contamination) will cause the
device to fail.
Important Notices
The material in this document is for information purposes only. The contents and the product it describes
are subject to change without notice. KMC Controls,
Inc. makes no representations or warranties with respect
to this document. In no event shall KMC Controls, Inc.
be liable for any damages, direct or incidental, arising
out of or related to the use of this document.
KMC Controls, Inc.
19476 Industrial Drive
New Paris, IN 46553
574.831.5250
www.kmccontrols.com
info@kmccontrols.com
CTC-4001/4004 2 Installation Guide
© 2011 KMC Controls, Inc. 416-019-01B
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