Product Overview

The performance specifications are nominal and conform to acceptable industry standards. For applications at conditions beyond these specifications, consult the local Johnson Controls office.
Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products. © 2011 Johnson Controls, Inc.
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T-4756
Heating-Cooling High Volume Output Thermostats
Description
The T-4756 Thermostat is a high volume
output, dual-temperature, dual-dial, heating-
cooling thermostat. The T-4756 provides
automatic changeover between direct and
reverse actions when supply pressure
changes from 15 to 20 psig (105 to 40 kPa).
Refer to T-4000 Series Pneumatic Room
Thermostat Product Bulletin (LIT-7171060P)
for important product information.
Selection Charts
T-4756 Heating-Cooling High Volume Output Thermostat
1
1. Order cover and mounting bracket separately.
Code Number Description
T-4756-201 15 psig DIR, 20 psig REV, Horizontal Mounting
T-4756-202 15 psig DIR, 20 psig REV, Vertical Mounting
T-4756-205 15 psig REV, 20 DIR, Horizontal Mounting
T-4756-206 15 psig REV, 20 psig DIR, Vertical Mounting
Commonly Used Accessories for T-4756 (Part 1 of 2)
Code
Number
Description
T-4002-124 Room instrument mounting bracket for
surface-mounting thermostats and
covers; includes drywall clips, spacers,
and mounting templates
T-4002-122 Terminal Connector, with two straight
fittings for plug-in connection to
5/32 in. O.D. polyethylene tubing
T-4002-123 Terminal Connector, with angle fittings
for surface mounted thermostats with
exposed tubing
T-4002-5003 Restricted adjustment pin (100/kit)
restricts adjustment of set point dial
T-4002-5012 Adjusting knob kit provides a means of
external setpoint adjustment
T-4000-2138 Beige Plastic Cover,
Horizontal or Vertical
(no thermometer, no set point windows)
T-4000-2139 Beige Plastic Cover, Horizontal
(no thermometer, no set point windows)
T-4000-3139 White Plastic Cover, Horizontal
(no thermometer, no set point windows)
T-4000-2140 Beige Plastic Cover, Horizontal,
thermometer (no set point windows)
T-4000-3140 White Plastic Cover, Horizontal,
thermometer (no set point windows)
Note: For additional accessories, refer to T-4000 Series Accessories
Catalog Page (LIT-1921710) on Page 94.
Technical Specifications
T-4756-2141 Beige Plastic Cover, Horizontal,
2 set point windows (no thermometer)
T-4756-1738 Beige Plastic Cover, Horizontal,
2 set point windows with thermometer
T-4000-2144 Beige Plastic Cover, Vertical
(no thermometer, no set point windows)
T-4000-3144 White Plastic Cover, Vertical
(no thermometer, no set point windows)
T-4756-2145 Beige Plastic Cover, Vertical,
2 set point windows (no thermometer)
T-4756-1739 Beige Plastic Cover, Vertical,
2 set point window with thermometer
T-4756 Heating-Cooling High Volume Output Thermostat
Sensitivity Adjustable from .75 to 4.0 psig/°F (9 to 50 kPa/°C)
Factory set at approximately 2.5 psig/°F (32 kPa/°C)
Flow Capacity 400 SCIM (107 mL/s)
Air Consumption 20 SCIM (5 mL/s)
Supply Pressure 13 to 25 psig (91 to 175 kPa)
15 psig (105 kPa)
20 psig (140 kPa)
Dial Range 55 to 85°F (Two Dials)
Air Connections Two (Supply and Output)
Special Feature Dual Dials, separate set point adjustments
Commonly Used Accessories for T-4756 (Part 2 of 2)
Code
Number
Description
Code No. LIT-1921690
Issued January 15, 2008
T-4756 Heating-Cooling
High Volume Output Thermostat
Features
• includes Fahrenheit dial
• available in vertical or horizontal model
Repair Information
If the T-4756 Heating-Cooling High Volume
Output Thermostat fails to operate within its
specifications, replace the unit. For a
replacement thermostat, contact the nearest
Johnson Controls® representative.