Product Overview

Models
CTC-1611 Direct acting
CTC-1612 Reverse acting
Description and Application
These single-setpoint, one-pipe thermostats are
designed for proportional control of pneumatic
valve and damper actuators used in HVAC systems.
A highly sensitive bimetal element with feedback is
used for accuracy and stability.
Models are available for direct or reverse acting
proportional action. The throling range is factory
set and eld adjustable. Setpoints are adjusted using
sliders which can be locked or limited using setpoint
stops (HFO-0027).
The thermostats require a scale plate assembly,
cover, and an external 14.4 scim restrictor in the
supply line. See the Accessories section for a
variety of options.
Features
♦ Sensitive bimetal element provides consistent,
accurate feedback
♦ Direct or reverse acting proportional control
of valve or damper actuators (see the Models
section)
♦ Field-adjustable throling range
Specifications and design subject to change without notice.
CTC-1611/1612
One-Pipe, Pneumatic, Room Thermostats
Specifications
Setpoint Range 55 to 85° F (13 to 29° C)
Throling Range 3° to 12° F (1.7° to 6.7° C)
factory set @ 3° F, eld
adjustable up to 12° F
Calibration 9 psi (62 kPa) branch pressure
Air
Supply Pressure 20 psi (138 kPa), 30 psi (207
kPa) maximum, supplied
through a 14.4 scim (3.9 mL/s)
restrictor sold separately
Output Capacity 14.4 scim or less when using a
proper restrictor
Consumption 14.4 scim or less when using
proper restrictor
Material Black ame-retardant plastic
Weight 3 oz. (85 grams)
Temperature Limits
Operating 40° to 120° F (4° to 49° C)
Shipping –40° to 140° F (–40° to 60° C)
Description and Application 1
Features 1
Models 1
Specifications 1
Accessories 2
Dimensions and Details 2
(Shown with Horizontal Scale Plate
and Light Almond Cover Installed)