Schneider Electric T168 Series Data Sheet
Application
T168 Series
The T168 series microprocessor based
thermostat/controller provides a 0-10 Vdc or 4-20 mA
control. This series controls a variety of two-pipe and
four-pipe fan coil units, air handling units, unitary
equipment, and various heating and cooling
applications.
The microprocessor combines a proportional plus
intergral control algorithm with advanced adaptive
logic. This provides control without the need for tuning
or calibrating the control algorithm in the field.
Features
T168 Series
Digital, Proportional Thermostat/Controller
General Instructions
• Digital display of set point, ambient temperature,
and operating mode
• 0-10 Vdc or 4-20 mA heat and cool outputs
• Remote setback capability from a time clock or
facility management system (contact closure)
• Auxiliary heat function
• Remote and seasonal changeover sensor
• Fahrenheit or Celsius display capability
• In two pipe mode a built-in purge cycle assists the
controller to determine if the controlling agent is
providing heating or cooling
• Line voltage cont inuous on/off or 3-speed fa n control
• Low voltage fan cycling operation with demand
output
Printed in U.S.A. 5/10 © Copyright 2010 Schneider Electric All Rights Reserved. F-27025-3
SPECIFICATIONS
Inputs
Outputs
Environment
Power Input: 20 to 28 Vac, nominal 24 Vac. Power Consumption: 25 mA maximum at 24 Vac. Connections:
Power, Terminal strip with screw down terminals.
Control, Terminal strip with screw down terminals.
Control Signal Load (Resistive): 0-10 Vdc, Minimum 1,000 Ω. 4-20 mA, 100 - 600 Ω.
Electrical:
Thermostatic Switch Rating, 10 VA @ 24 Vac. Fan Switch Current Ratings, Refer to Table-1. Proportional Band, 2F degrees (1.1C degrees). Setpoint Adjustment Range, 50 to 90° F (10 to 32°C). Heating/cooling Changeover Deadband, 3F degrees (1.6C degrees).
Mechanical:
Display Range, 32 to 99°F (0 to 37°C) Set point Range, 50 to 90°F (10 to 32°C). Material, Rigid vinyl. Finish, Cool gray.
Temperature limits:
Shipping & Storage, -30° to 130°F (-34° to 55°C).
Operating, 32° to 130°F (0° to 55°C). Humidity: Non-condensing. Shipping Weight: 0.6 lbs (270 g). Location: NEMA Type 1.
Agency Listings
CE: Compliant.
Table-1 Fan Switch Current Ratings (Amps).
Inductive
Voltage FLA LRA
24 N/A N/A N/A 24 VA
120 5.8 34.8 6.0 125 VA
240 2.9 17.4 5.0 125 VA
277 2.4 14.4 4.2 125 VA
1 When Fan Switch is off, all thermostat heat/cool and fan functions are off.
1
Resistive Amps Pilot Duty
2 © Copyright 2010 Schneider Electric All Rights Reserved. F-27025-3
Table-2 Model Chart.
Model Outputs Fan Control Demand Output Auxiliary heat Setback System Modes
T A168-001 Dual None* No Yes Yes Off-Auto-Heat-Cool
TA168-002 Dual Off-Hi-Med-Lo Yes Yes Yes Off-Auto-Heat-Cool
TA168-003 Single Off-Hi-Med-Lo Yes No Yes Off-Heat/Off-Cool
T A168-004 Single None*
T A168-005 Single None* Yes No Yes Off-Heat/Off-Cool
T A168-006 Dual None* Yes Yes Yes Off-Auto-Heat-Cool
T A168-007 Single Off/On Yes No Yes Off-Heat/Off-Cool
T A168-008 Dual Off/On Yes No Yes Off-Auto-Heat-Cool
* Fan terminals do not exist on these models. If equipped with a demand terminal, the demand terminal is powered with 24 V on a call for heat
or cooling. The demand terminal output can be used to control a fan relay, 10 VA @ 24 Vac.
No No Yes Off-Heat/Off-Cool
Accessories
65345 4-3/4” x 4-3/4” adapter plate.
65406 Remote sensor, 60" leads 10k Ω @ 77°F (25°C).
TYPICAL APPLICATIONS (wiring diagram)
CAUTION:
• Keep all wiring at least 1-1/2 ft. (45.7 cm) away from any potential source of electrical
interference or noise.
• Do not run sensor wire parallel to line voltage wiring.
• Do not run sensor wire in conduit with line voltage.
• When low voltage or sensor wiring must intersect line voltage, cross at perpendicular
angle to minimize electrical noise.
F-27025-3 © Copyright 2010 Schneider Electric All Rights Reserved. 3
Figure-1 Typical Wiring.
1
1
2
2
2
For main and secondary
outputs, Terminal 6 is the
common and Terminal 5
is the power.
For setback, demand and
auxillary heat outputs
Terminal 5 is the common
and Terminal 6 is the power.
L1 (Hot)
LO
MED
HI
L2 OR NEUTRAL
24 - 277 VAC
VOLTAGE
CONNECTION
3 SPEED FAN CONTROL
TA168-002/TA168-003 CONTINUOUS FAN
FAN
1
2
3
4
24 - 277 VAC
VOLTAGE
CONNECTION
SINGLE SPEED FAN CONTROL
L1 (HOT)
L2 OR NEUTRAL
TA 168-007/TA168-008 CONTINUOUS FAN
FAN
1
4
For demand fan control,
power a 24V fan relay
using Terminal 12 as
the output. Output limited to 10 VA.
Can be used for second stage
24 Vac heat output or single
stage 24 Vac electric heat
output by setting dipswitch #2.
LOW VOLTAGE
CONNECTIONS
24 VAC
XFMR
SETBACK INPUT
SETBACK
SWITCH
SECONDARY
0-10 VDC
OR
4-20 mA
MAIN
0-10 VDC
OR
4-20 mA
OPTIONAL REMOTE PROBE
OPTIONAL CHANGEOVER SENSOR
5
6
7
8
9
10
11
12
13
15
16
17
18
19
DEMAND
OUTPUT
3
3
4 © Copyright 2010 Schneider Electric All Rights Reserved. F-27025-3
5
Figure-2 Typical Wiring for TA168-001 Dual Output Proportio nal Control.
L1 (HOT)
L2 OR NEUTRAL
LINE VOLTAGE
CONNECTIONS
FAN
1
2
3
4
LO
MED
HI
LOW VOLTAGE
CONNECTIONS
24 VAC
XFMR
SETBACK INPUT
SETBACK
SWITCH
SECONDARY
0-10 VDC
OR
4-20 mA
MAIN
0-10 VDC
OR
4-20 mA
OPTIONAL REMOTE PROBE
OPTIONALCHANGEOVER SENSOR
5
6
7
8
9
10
11
12
13
15
16
17
18
19
DEMAND
OUTPUT
Can be used for second stage
24 Vac heat output or single
stage 24 Vac electric heat
output by setting dipswitch #2.
1
1
Figure-3 Typical Wiring for TA168-002 and TA168-003 Dual Output Proportional Contro l with
Three-Speed Line Voltage Fan Control.
LOW VOLTAGE
CONNECTIONS
10
11
12
13
15
16
17
18
19
6
7
8
9
SETBACK INPUT
SETBACK
SWITCH
MAIN
0-10 VDC
SECONDARY
0-10 VDC
OR
4-20 mA
1
OPTIONAL REMOTE PROBE
OPTIONAL CHANGEOVER SENSOR
OR
4-20 mA
DEMAND
OUTPUT
24 VAC
XFMR
1
Can be used for second stage
24 Vac heat output or single
stage 24 Vac electric heat
output by setting dipswitch #2.
F-27025-3 © Copyright 2010 Schneider Electric All Rights Reserved. 5
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