Johnson Controls T28 Series Data Sheet
h
MED
OFF
LO
HI
h
MED
OFF
LO
HI
T28CD
Heating-Cooling Thermostat
with Off-Hi-Med-Lo Fan Switch
T28DG
Sequenced Heating-Cooling Thermostat
with Off-Hi-Med-Lo Fan Switch
t28cd.eps
t28dg.eps
T28CD Thermostat
Multi-Stage Electromechanical Temperature Controls
T28 Series Fan Coil Thermostat (with or without Fan Selector
Switches)
Description
This thermostat controls light duty line voltage
fan coil or baseboard valves on heating,
cooling, and heating-cooling systems. The
thermostat can control one or two valves
directly. These thermostats are rated for 120,
208, or 240 VAC at 50 to 60 Hz.
Refer to the T28 Series Fan Coil Thermostats
Product Bulletin (LIT-125650) for important
product application information.
Features
• precision, snap-acting contacts
• heating and cooling anticipation
• cooling and heating-cooling models have
an interlocked fan off position
Applications
Use for line voltage control of heating and
cooling equipment.
Code No. LIT-1922265
Repair Information
If the T28 Series Fan Coil Thermostat (with or
without Fan Selector Switches) fails to operate
within its specifications, replace the unit. For a
replacement thermostat, contact the nearest
Johnson
Controls®
representative.
Selection Chart
Product Code Number Fan Switch Shipping Weight, lb (kg)
T28BD-1C Off-Hi-Med-Lo 1.3 (0.59)
T28CD-1C Off-Hi-Med-Lo 1.3 (0.59)
Heating-Cooling, Sequenced (Automatic changeover, Separate valves for heating and cooling)
T28DA-1C None 1.0 (0.45)
1
C
T28DB-1
T28DD-1C
T28DG-1C
1. Off position of fan switch interlocks to turn off cooling.
2. For automatic changeover where one valve functions for heating or cooling, use A19CAC-2 Strap-On Changeover Control.
3. Off position of fan switch interlocks to turn off bot h heating and cooling.
1
3
Technical Specifications
The T28 mounts on a standard, double outlet box.
Nominal operating differential at 0.6°F (0.3 C°) heating, 1 F° (0.6 C°) cooling on standard 120 VAC fan coil valves.
Sequenced models have 6 F° (3.3 C°) differential from heat on to cool on.
Electrical Ratings – Ampere
VAC Thermostat Fan Switch
120 0.32 1.0 0.12 0.36 5.8 34.8
208 0.18 0.57 0.07 0.21 3.3 19.8
240 0.16 0.50 0.06 0.18 2.9 17.4
Cooling
Heating-Cooling (Remote changeover, Single valve for heating and cooling)
Off-On 1.3 (0.59)
Off-Hi-Med-Lo 1.3 (0.59)
Off-Hi-Med-Lo 1.3 (0.59)
1
2
Cooling Heating
Normal Inrush Normal Inrush Full Load Amperes Locked Rotor Amperes
The performance specifications are nomina l and con form to accep table ind ustry stand ards. For applicati ons at con ditions be yond these specification s, consult th
Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products. © 2015 Johnson Controls, Inc.
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