Product Overview

Description and Application
These thermostats are designed for proportional
control of pneumatic valve and damper actuators
in HVAC systems. They utilize a highly sensitive
bimetal element with feedback and a pilot bleed
relay for accuracy and stability.
Models are available with with direct or reverse
proportional action. The thermostat’s throling
range is factory-set and is 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 and
cover. These items may be ordered separately or
in a value package (CTC-162X-103) that includes
the most commonly ordered accessories (see the
Models and Accessories sections).
Features
♦ Sensitive bimetal element and pilot relay provide
consistent, accurate feedback
♦ Direct or reverse acting (see the Models section),
proportional control of valve or damper actuators
♦ Field-adjustable throling range
Specifications and design subject to change without notice.
CTC-1621/1622
Two-Pipe, Pneumatic, Room Thermostats
Specifications
Setpoint Range 55 to 85° F (13 to 29° C), ad-
justable via slider (adjuster
may be concealed and locked
or limited)
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
Output Capacity 200 scim (55 mL/s)
Consumption 20 scim (5.5 mL/s)
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
Specifications 1
Features 1
Models 1
Accessories 2
Dimensions and Details 2
Models
CTC-1621 Direct acting
CTC-1621-103 Direct acting, value package*
CTC-1622 Reverse acting
CTC-1622-103 Reverse acting, value package*
*Thermostat value packages contain the necessary
components to allow replacement of most Barber-
Colman, Johnson Controls, L&G-P, or Robertshaw/
Invensys thermostats. They also oer easy ordering
of just one part number to furnish all necessary
components and mounting hardware for vertically
(only) mounted thermostats. In addition to a CTC-
1621 or CTC-1622 base, the packages contain these
accessories:
HPO-0048-10 °F vertical scale plate
HPO-1511 Light almond, full window, ABS
thermostat cover
HMO-5030 Light almond backplate kit with
decorative matching plate
HPO-1320 Label strip
HFO-0027 Setpoint stops strip
(Shown with Horizontal Scale Plate
and Light Almond Cover Installed)