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TEC26x7-2 Series BACnet® MS/TP Networked Thermostat s
with Two Outputs
Installation Instructions
Part No. 24-9890-242, Rev. A
Issued November 8, 2006
Supersedes January 31, 2006
Applications
The TEC26x7-2 Series Thermostats are BACnet®
Master-Slave/Token-Passing (MS/TP) networked
devices that provide control of local hydronic re he a t
valves, pressure dependent Variable Air V olume (VAV)
equipment with or without local reheat, or other zoning
equipment using an on/off, floating, or proportional
0 to 10 VDC control input. The technologically
advanced TEC26x7-2 Series Thermostats feature a
Building Automation System (BAS) BACnet MS/TP
communication capability that enables remote
monitoring and programmability for efficient space
temperature control.
The TEC26x7-2 Series Thermostat s feature an intuitive
user interface with backlit display that makes setup and
operation quick and easy . Th e thermostat s also employ
a unique, Proportional-Integral (PI) time-proportioning
algorithm that virtually eliminates temperature offset
associated with traditional, differential-based
thermostats.
IMPORTANT: The TEC26x7-2 Series Thermostats
are intended to provide an input to equipment under
normal operating conditions. Where failure or
malfunction of the thermostat could lead to personal
injury or property damage to the controlled
equipment or other property, additional precautions
must be designed into the control system.
Incorporate and maintain other devices such as
supervisory or alarm systems or safety or limit
controls intended to warn of, or protect against,
failure or malfunction of the thermostat.
North American Emissions Compliance
United States
This equipment has been tested and found to comply
with the limits for a Class A digital device pursuant to
Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful
interference when this equipment is operated in a
commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if
not installed and used in accordance with the
instruction manual, may cause harmful interference to
radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference,
in which case the user will be required to correct the
interference at his/her own expense.
Canada
This Class (A) digital apparatus meets all the
requirements of the Canadian Interference-Causing
Equipment Regulations.
Cet appareil numérique de la Classe (A) respecte
toutes les exigences du Règlement sur le matériel
brouilleur du Canada.
Installation
Location Considerations
Locate the TEC26x7-2 Series Thermostat:
• on a partitioning wall, approximately 5 ft (1.5 m)
above the floor in a location of average
temperature
• away from direct sunlight, radiant heat, outside
walls, behind doors, air discharge grills, stairwells,
or outside doors
• away from steam or water pipes, warm air stacks,
unconditioned areas (not heated or cooled), or
sources of electrical interference
Note: Allow for vertical air circulation to the
TEC26x7-2 Series Thermostat.
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs
Installation Instructions
1
Page 2
To install the thermostat:
1. Use a Phillips-head screwdriver to remove the
security screw on the bottom of the thermostat
cover.
2. Pull the bottom edge of the thermostat cover and
open the thermostat as illustrated in Figure 1.
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6. Drill a 3/16 in. (5 mm) hole at each of the two
marked locations and tap nylon anchors (included
with the thermostat) flush to the wall surface.
7. Position the thermostat mounting base on the wall
and use the two mounting screws (included with
the thermostat) to secure the base to the surface
as illustrated in Figure 3.
Note: Be careful not to overtighten the mounting
screws.
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Figure 1: Removing the Thermostat Cover
3. Carefully pull the locking tabs on the right side of
the thermostat mounting base and unlock the
Printed Circuit Board (PCB). Open the PCB to the
left as illustrated in Figure 2.
PCB
Locking
Tabs
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Figure 2: Opening the Thermosta t PCB
4. Pull approximately 6 in. (152 mm) of wire from the
wall and insert the wire through the hole in the
thermostat mounting base.
5. Align the thermostat mounting base on the wall and
use the base as a template to mark the two
mounting hole locations.
Note: Be sure to position the thermostat mounting
base so that the arrow on the base points upward to
indicate the top of the thermostat.
Figure 3: Securing the Thermostat
Mounting Base to the Wall
8. Swing the PCB back to the right and carefully snap
it into the locking tabs on the thermostat mounting
base.
9. Remove the screw terminal blocks as illustrated in
Figure 4.
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Figure 4: Removing the Screw Terminal Blocks
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions2
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Wiring
When an existing thermostat is replaced, remove and
label the wires to identify the terminal functions. When
a TEC26x7-2 Series Thermostat is replaced, simply
remove the old screw terminal blocks and reinsert them
onto the PCB of the replacement thermostat.
CAUTION: Risk of Electric Shock.
Disconnect the power supply before
!
!
IMPORTANT: Make all wiring connections in
accordance with local, national, and regional
regulations. Do not exceed the electrical ratings of
the TEC26x7-2 Series Thermostat.
making electrical connections to avoid
electric shock.
CAUTION: Risk of Property Damage.
Do not apply power to the system before
checking all wiring connections. Short
circuited or improperly connected wires
may result in permanent damage to the
equipment.
To wire the thermostat:
1. Strip the ends of each wire 1/4 in. (6 mm) and
connect them to the appropriate screw terminals as
indicated in Table 1 and Figure 5 through
Figure 18.
Note: For more details on wiring the MS/TP
Communications Bus, refer to the MS/TP
Communications Bus Technical Bulletin
(LIT-12011034).
2. Carefully push any excess wire back into the wall.
Note: Seal the hole in the wall with fireproof material
to prevent drafts from affecting the ambient
temperature readings.
3. Reinsert the screw terminal blocks onto the PCB.
4. Reattach the MS/TP communication wires to the
terminal block.
Note: If multiple wires are inserted into the terminals,
be sure to properly twist the wires together prior to
inserting them into the terminal connectors.
5. Reattach the thermostat cover to the mounting
base (top side first).
6. Use a Phillips-head screwdriver to reinstall the
security screw on the bottom of the thermostat
cover.
Table 1: Terminal Identification (See Figure 5.)
Terminal
Number
4 24 V~ Hot 24 V~ Hot 24 VAC from Transformer
5 24 V~ Com 24 V~ Com 24 VAC (Common) from Transformer
6 BO5 Aux BO5 Aux Aux BO (Auxiliary Output)
7 BO5 Aux BO5 Aux Aux BO (Auxiliary Output)
8 BO3 Blank Open Heat
9 BO4 AO2 Close Heat
10 BO1 AO1 Open Cool
1 1 BO2 Blank Close Cool
12 BI1 BI1 Configurable Binary Input 1
13 RS RS Remote Sensor
14 Scom Scom Sensor Common
15 BI2 BI2 Configurable Binary Input 2
16 UI3 UI3 Configurable Universal Input 3
Blank +, –, REF +, –, REF MS/TP Bus
TEC2627-2
(On/Off or
Floating Control)
Terminal Label Function
TEC2647-2
(Proportional
0to10VDCControl)
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions 3
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–
Separ at e 24 VAC
Power Source for Auxiliar y Output
(24 VA C Maximu m)
24 V~
24 V~
Hot
Com
BO5
Aux
24 VAC
Thermostat Power
Same 24 VAC
Power Source for Auxiliar y Output
(24 VA C Maximu m)
24 V~
Com
BO5
Aux
24 V~
Hot
24 VAC
Thermostat Power
BO5
Aux
Aux
BO5
Aux
Aux
+
–
REF
Eight-Pole Bottom Connector
BO4/
AO2
9 10 11 12 13 14 15 16
Independent
Contacts
• Reheat
• Lighting
• On/Off Actuation
• Exhaust Fan
Remote Inputs
BI1
Voltage-Free
Contact
• Remote NSB
• Motion
• Window
Two-Pole
Left Top
Connector
24 V~
24 V~
Com
Hot
4 5
BO1/
BO2
BI1
AO1
Scom
BI2 UI3
RS
- OR -
Supply S ensor
Changeover Sensor
Three-Pole
Right Top
Connector
BO5
Aux
6 7 8
Scom
BI2
Voltage-Free
Contact
• Door
• Remote
Override
• Filter Alarm
• Service Alarm
Voltage-Free
Contact
• COC/NH
Normally Heat
Closed Contact
= Cold Water
• COC/NC
Normally Cool
Closed Contact
= Hot Water
BO5
Aux
BO3
UI3
+
Supervisory
Controller
REF
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Figure 5: Wiring the TEC26x7-2 Series Thermostat
(See Table 1.)
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions4
Page 5
Floating
Actuator
Room Temperature Control Thermostat
(Minimum and Maximum Pos i t ion
Adjusted on Actuator)
Figure 6: Wiring the TEC2627-2 Thermostat for Floating Control
(Pressure-Dependent VAV Cooling Only)
UI3 COS
24 V~ Com
24 V~ Hot
BO1 Open
BO2 Close
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Proportional
Actuator
0 to 10
VDC
UI3 COS
24 V~ Com
Room Temperature Control Thermostat
(Minimum and Maximum Position
Adjusted on Actuator)
24 V~ Hot
AO1
Figure 7: Wiring the TEC2647-2 Thermostat for Proportional 0 to 10 VDC Control
(Pressure-Dependent VAV Cooling Only)
Changeover
Sensor
Floating
Actuator
Room Temperature Control Thermostat
(Minimum and Maximum Positio n
Adjusted on A ct uator)
Supply Air
Temperature Sensor
UI3 COS
24 V~ Com
24 V~ Hot
BO1 Open
BO2 Close
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Figure 8: Wiring the TEC2627-2 Thermostat for Floating Control
(Pressure-Dependent VAV Heating/Cooling with Changeover)
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions 5
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Changeover
Sensor
Supply Air
Tempe r at ur e Sensor
Proportional
Actuator
0 to 10
VDC
UI3 COS
24 V~ Com
Room Temperature Control Thermostat
(Mini m u m an d Ma ximum Pos i t ion
Adjusted on Actuator)
24 V~ Hot
AO1
Figure 9: Wiring the TEC2647-2 Thermostat for Proportional 0 to 10 VDC Control
(Pressure-Dependent VAV Heating/Cooling with Changeover)
Supply Air
Tempe r ature Sensor
UI3 COS
24 V~ Com
24 V~ Hot
BO1 Op en
BO2 Close
BO5-Aux
BO5-Aux
1
C
Changeover
Sensor
Room Temperature Control Thermostat
Floating
Actuator
Heating/Cooling
and On/Off
Duct Heater
(Minimum and Max i m um P os i t ion
Adjusted on A ct uator)
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Figure 10: Wiring the TEC2627-2 Thermostat for Floating Control
(Pressure-Dependent VAV Heating Cooling with Changeover and Reheat)
Changeover
Sensor
Room Temperature Control Thermostat
Proportional
Actuator
Heating/Cooling
and On/Off
Duct Heater
(Minim u m an d Ma ximum Pos i tion
Adjuste d on Actuator)
Supply Air
Tempe r at ur e Sensor
UI3 COS
24 V~ Com
24 V~ Hot
AO1
AO2
BO5-Aux
BO5-Aux
0 to 10
VDC
1
C
Figure 11 : Wiring the TEC2647-2 Thermostat for Proportional 0 to 10 VDC Control
(Pressure-Dependent VAV Heating/Cooling with Changeover and Reheat)
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TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions6
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UI3 COS
24 V~ Com
24 V~ Hot
BO1 Open
BO2 Close
Room Temperature
Control Therm ostat
Figure 12: Wiring the TEC2627-2 Thermostat for Floating Control
(Heating/Cooling Hydronic Valve Control)
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UI3 COS
24 V~ Com
24 V~ Hot
AO1
0 to 10
VDC
Room Temperature
Control Therm ostat
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Figure 13: Wiring the TEC2647-2 Thermostat for Proportional 0 to 10 VDC Control
(Heating/Cooling Hydronic Valve Control)
Optional Wat er
Supply S ensor
Room Temperature
Control Therm ostat
Floating
Heating/Cooling
Valve
UI3 COS
24 V~ Com
24 V~ Hot
BO1 Open
BO2 Close
Supply Water
Tempe r at ur e Sensor
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Figure 14: Wiring the TEC2627-2 Thermostat for Floating Control
(Heating/Cooling Hydronic Valve Control with Changeover)
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions 7
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UI3 COS
24 V~ Com
24 V~ Hot
Optional Wat er
Supply S ensor
Proportional
Heating/Cooling
Valve
AO1
0 to 10
VDC
Room Temperature
Control Therm ostat
Supply Water
Tempe r at ur e Sensor
Figure 15: Wiring the TEC2647-2 Thermostat for Proportiona l 0 to 10 VDC Co nt rol
(Heating/Cooling Hydronic Valve Control with Changeover)
24 V~
or
24 V~
Hot
Two -Pip e Applic ations
24 V~
Com
Cooling
Valve
Heating
Valve
or
or
Four-Pipe Applications
24 V~
Hot
Com
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Figure 16: Wiring the TEC2627-2 Thermostat for On/Off Control
Heating/Cooling
Valve
Two -Pip e Applic ations
Figure 17: Wiring the TEC2627-2 Thermostat for Floating Control
BO1
BO2
24 V~
Hot
24 V~
Com
Cooling
Valve
Heating
Valve
BO1
BO2 BO3
BO4
Four-Pipe Applications
24 V~
Hot
24 V~
Com
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TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions8
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AO1
Com
Hot
24 V~
24 V~
Cooling
Valve
Heating/Cooling
Valve
Heating
Valve
Two -Pip e Applic ations
Figure 18: Wiring the TEC2647-2 Thermostat for Proportional Control
Table 2: MS/TP Bus Objects (Part 1 of 4)
Point Name Thermostat Point
(Type/Address)
Room Temp
Room Temp Override
Outdoor Temperature
Sequence of Operation
System Mode
Occupancy
PI Heating Demand
PI Cooling Demand
Supply Temperature
AUX (BO5) Status
AUX (BO5) Output
1, 2
3
3, 4
3
3
3
5
5
5
5
3
Heating (BO3 and BO4) Valve Status
(TEC2627-2 Model)
5
AV 6 -40.0°F/-40.0°C to
BV 7 0 = Normal
AV 8 -40.0°F/-40.0°C to
MSV 39 1 = Cooling Only
MSV 13 1 = Off
MSV 12 1 = Resume Schedule
AV 54 0 to 100%
AV 55 0 to 100%
AI 11 -40.0°F/-40.0°C to
BI 65 0 = Off
BV 47 0 = Off
MSV 66 For On/Off Control:
AO1
Hot
24 V~
AO2
Four-Pipe Applications
Range
122.0°F/50.0°F
1 = Override
122.0°F/50.0°F
2 = Heating Only
3 = Cooling and Reheat
4 = Heating and Reheat
5 = Cool/Heat Four-Pipe
6 = Cool/Heat Four-Pipe and Reheat
2 = Cool
3 = Heat
4=Auto
2 = Occupied
3 = Unoccupied
4 = Temporary Occupied
122.0°F/50.0°F
1=On
1=On
1=Open
2 = Closed
For Floating Control:
1 = Stopped
2=Opening
3=Closing
24 V~
Com
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TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions 9
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Table 2: MS/TP Bus Objects (Part 2 of 4)
Point Name Thermostat Point
(Type/Address)
Cooling (BO1 and BO2) Valve Status
(TEC2627-2 Model)
BI1 Status
BI2 Status
UI3 Status
5, 6
5, 6
5, 6
Window Alarm
Filter Alarm
5
Service Alarm
Occupied Heat Setpoint
Occupied Cool Setpoint
Unoccupied Heat Setpoint
Unoccupied Cool Setpoint
Keypad Lockout
BI1 Configuration
BI2 Configuration
UI3 Configuration
Menu Scroll
Temperature Scale
5
5
5
3, 7
3, 7
3, 7
3, 7
3
3
3
3
3
3
MSV 67 For On/Off Control:
BI 62 0 = Deactivated
BI 63 0 = Deactivated
BI 64 0 = Deactivated
BI 58 0 = Off
BI 59 0 = Off
BI 60 0 = Off
AV 49 40.0°F/4.5°C to
AV 50 54.0°F/12.0°C to
AV 51 40.0°F/4.5°C to
AV 52 54.0°F/12.0°C to
MSV 40 1 = Level 0
MSV 16 1 = None
MSV 17 1 = None
MSV 18 1 = None
BV 19 0 = No Scroll
BV 21 0 = °C
Range
1 = Open
2 = Closed
For Floating Control:
1 = Stopped
2 = Opening
3=Closing
1 = Activated
1 = Activated
1 = Activated
1=On
1=On
1=On
90.0°F/32.0°C
100.0°F/37.5°C
90.0°F/32.0°C
100.0°F/37.5°C
2=Level1
3=Level2
4=Level3
5=Level4
6=Level5
2=RemNSB
3=MotionNO
4=MotionNC
5 = Window
2 = Door Dry
3 = Override
4 = Filter
5=Service
2 = COC/NH
3 = COC/NC
4=COS
5=SS
1=ScrollActive
1=°F
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions10
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Table 2: MS/TP Bus Objects (Part 3 of 4)
Point Name Thermostat Point
(Type/Address)
Out 1 (BO1 and BO2) Configuration
AUX (BO5) Configuration
Heating Setpoint Limit
Cooling Setpoint Limit
Setpoint Type
3
Temporary Occupancy Time
Door Time
Deadband
3
3
Reheat Time Base (BO5)
Control Type (TEC2627-2 Model)
3
3
3
3
3
3
3
MSV 23 1 = False
MSV 24 1 = Not Used
AV 27 40.0°F/4.5°C to
A V 28 54.0°F/12.0°C to
BV 29 0 = Permanent
MSV 30 1 = 0 Hours
MSV 31 1 = 1 Minute
AV 32 2F°/1C° to
BV 33 0 = 15 Minutes
BV 35 0 = On/Off
Range
2=True
2=NOwithOcc
3 = NC withOcc
6 = Network Controlled
90.0°F/32.0°C
100.0°F/37.5°C
1 = Temporary
2=1Hour
3=2Hours
4=3Hours
5=4Hours
6=5Hours
7=6Hours
8=7Hours
9=8Hours
10 = 9 Hours
11 = 10 Hours
12 = 11 Hours
13 = 12 Hours
14 = 13 Hours
15 = 14 Hours
16 = 15 Hours
17 = 16 Hours
18 = 17 Hours
19 = 18 Hours
20 = 19 Hours
21 = 20 Hours
22 = 21 Hours
23 = 22 Hours
24 = 23 Hours
25 = 24 Hours
2=2Minutes
3=3Minutes
4=4Minutes
5=5Minutes
6=6Minutes
7=7Minutes
8=8Minutes
9=9Minutes
10 = 10 Minutes
5F°/2.5C°
1 = 10 Seconds
1 = Floating
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions 1 1
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Table 2: MS/TP Bus Objects (Part 4 of 4)
Point Name Thermostat Point
(Type/Address)
3
Floating Motor Timing (TEC2627-2 Model)
On/Off Control CPH (TEC2627-2 Model)
Direct/Reverse Acting (TEC2647-2 Model)
TEC26x7-aaa
8, 9
MSV 36 1 = 0.5 Minutes
3
MSV 37 1 = 3 CPH
3
BV 38 0 = Direct Acting
Device 72aaa N/A
Range
2=1.0Minute
3=1.5Minutes
4=2.0Minutes
5=2.5Minutes
6=3.0Minutes
7=3.5Minutes
8=4.0Minutes
9=4.5Minutes
10 = 5.0 Minutes
11= 5.5 Minutes
12 = 6.0 Minutes
13 = 6.5 Minutes
14 = 7.0 Minutes
15 = 7.5 Minutes
16 = 8.0 Minutes
17 = 8.5 Minutes
18 = 9.0 Minutes
2=4CPH
3=5CPH
4=6CPH
5=7CPH
6=8CPH
1 = Reverse Acting
1. This MS/TP Bus object is readable and only writable if the corresponding override object is set. (For example, Room Temp
has a corresponding override object of Room Temp Override. This corresponding override object needs to be set to
1=Override to be able to write Room Temp to a diffe r e nt value.)
2. This MS/TP Bus object may automatically release after 10 minutes with no BACnet traffic.
3. This MS/TP Bus object is readable and writable.
4. This MS/TP Bus object is valid only if it is written via the network.
5. This MS/TP Bus object is readable only.
6. The BI object type status is available even if the configuration is set to None.
7. If one setpoint of a pair of heating and cooling setpoints (for example, Occupied Heat Setpoint and Occupied Cool
Setpoint) is overridden, the other setpoint of the pair may be automatically adjusted by the thermostat to maintain the
minimum deadband between the two setpoints.
8. The designation aaa is the address of the device (from 004 to 127) on the MS/TP network.
9. Max_Master is writable.
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions12
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Connecting the MS/TP Bus
To connect the MS/TP Bus:
1. Set the MS/TP address of the TEC26x7-2 Series
Thermostat per the engineering drawings and test
for bus voltage, polarity, and isolation prio r to wiring
the MS/TP Bus. (See the Com addr parameter in
Table 5 to set the MS/TP address for the
thermostat.)
Note: Pressing and holding the UP/DOWN arrow keys
simultaneously displays the MS/TP address that is
assigned.
Note: The wiring rules for the MS/TP Bus differ from
the wiring rules for the N2 Bus. For more details on
wiring the MS/TP Communications Bus, refer to the
MS/TP Communications Bus Technical Bulletin
(LIT-12011034).
2. Observe the polarity when connecting the bus
wires to the thermostat.
3. After the bus wires are connected to the fir st
thermostat, continue in a daisy-chained fashion to
the next thermostat.
Note: The bus wiring must be twisted-pair lines. Do
not run the bus wiring in the same conduit as line
voltage wiring (30 VAC or above) or other wiring that
switches power to highly inductive loads (such as
contactors, coils, motors, or generators).
The MS/TP Bus requires proper termination and
biasing at each end of a segment (a segment is a
physically continuous length of wire). The thermostat is
not equipped with the ability to provide this termination;
therefore, it is not recommended that it be located at
the physical ends of a bus segment.
Note: See Table 6 for end-of-line te rm in ato r ord eri ng
information.
It is recommended that the thermostat be configured
for automatic baud rate detection. Do not exceed the
maximum number of devices allowed on a Field Bus.
Be sure that the wiring terminations are set correctly,
and that all communication wiring is daisy-chained with
no taps.
A small green light under the thermostat cover (on the
left edge when facing the thermostat) indicates the
communications mode when the thermostat is
operating. The following blink codes may be seen:
• Off: indicates that there is no power to the
thermostat or that the MS/TP wiring polarity is
reversed.
• Long: Indicates that the MS/TP communication
daughter board is the wrong type for the main
board.
MS/TP Device Mapping
Preparation
Before mapping a TEC26x7-2 Series Thermostat into a
Network Automation Engine (NAE):
1. Decide which point objects within the thermostat
need to be mapped. Only map the point objects
that need to be viewed on a regular basis, since
excessive mapping lowers system performance.
Suggested point objects for mapping include:
Room Temp, System Mode, Fan Status, Occupied
Heat Setpoint, Occupied Cool Setpoint,
Unoccupied Heat Setpoint, and Unoccupied Cool
Setpoint. In addition, alarm points may be mapped
if they are used, and other point objects may be
mapped if required. Use the Engineering view to
examine infrequently used point objects.
Note: It is recommended that all thermostat
configuration parameters be set as desired, prior to
mapping the objects into the controller. If any
thermostat configuration parameters are altered after
the objects are mapped into the controller, it is
recommended that all objects be re-mapped.
2. Verify that a Field Bus is defined in the NAE.
BACnet MS/TP devices attach to a Field Bus.
Refer to the BACnet MS/TP Integration with the
NAE Technical Bulletin (LIT-12011013) for
instructions on how to define a Field Bus.
3. Verify that a BACnet Integration is defined for the
Field Bus. The thermostat is mapped as a BACnet
device under a Field Bus BACnet Integration.
Refer to the BACnet System Integration with NAE
Technical Bulletin (LIT-1201531) for instructions on
how to define a BACnet Integration.
At this point, the thermostat and the required point
objects inside the thermostat can be mapped.
• Short-Short-Long: Indicates that the baud rate is
known and that communication is active.
• Short-Short: Indicates that the thermostat is
scanning for the correct baud rate and that ther e is
no communication.
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions 13
Page 14
Adding a Thermostat
The thermostat must be added before its point s can be
mapped. To do this, select the BACnet Integration
under the Field Bus (refresh the tree view if required to
see a newly added BACnet Integration) and choose
Field Device from the Insert menu. Assisted Definition
using Auto Discovery is the easiest way to add a new
thermostat online; however, this requires that the
thermostat that is to be added is connected and ready
to communicate.
Adding Point Objects
The required point objects must be mapped under the
thermostat device. To accomplish this, select the
thermostat device under the BACnet Integration
(refresh the tree view if required to see a newly added
thermostat device) and choose Field Point from the
Insert menu. Assisted Definition using Auto Discovery
is the easiest way to add new point objects online;
however, this requires that the thermostat that is to be
mapped is connected and ready to communicate.
Device object names used with BACnet
Communication must be unique to fully satisfy the
requirements of BACnet. The thermostat automatically
selects a device object name for itself using the format
TEC26x7-aaa, where aaa designates the address
selected (from 004 to 127) on the MS/TP network. If
this name needs to be changed by writing a new one
into the thermostat device object, that should be done
before any point objects are mapped. Be sure that the
name of the new thermostat being added to the NAE
matches that of the thermostat itself. This name goes
into the Name field, Object section, Configuration tab of
the Configure step in the Insert Field Device Wizard.
Device object IDs used with BACnet communications
must be unique to fully satisfy the requirements of
BACnet MS/TP network guidelines. The thermostat
automatically selects a device object ID for itself using
the format 72aaa, where aaa designates the address
selected (from 004 to 127) on the MS/TP network (for
example, 72004, 72005). If this ID needs to be
changed by writing a new one into the thermostat
device object, that should be done before any po int
objects are mapped. Be sure that the ID of the new
thermostat being added to the NAE matches that of the
thermostat itself. This number goes into the Instance
Number field, Network section, Hardware tab of the
Configure step in the Insert Field Device Wizard.
When mapping point objects, the point type must
match the BACnet object type (for example, AV, MV,
BI), and the point instance number must match the
point BACnet instance number.
Overriding via the NAE
The last override command to any point object is used
or saved.
One override can be used at a time at each point object
(for example, if an override from the network is active,
the local adjustment and internal control are disabled).
If a setpoint is overridden, the thermostat adjusts the
other setpoint, if necessary, to maintain the minimum
deadband between the two setpoints. The setpoints
can be spread farther apart but can never be adjusted
closer than 2F°/1C° or the Deadband parameter
selection.
All network overrides are released automatically after
10 minutes of no communication to any other device
(for example, if the network cable is removed from the
thermostat). Other devices can be the NAE, another
thermostat, or a VAV Modular Assembly (VMA).
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions14
Page 15
Setup and Adjustments
Thermostat Operation Overview
Backlit, pl ain text
LCD is easy to read
in any condi t io n.
Three key s on the thermostat
make operation easy and intuitive.
Figure 19: Front Cover of Thermostat
Thermostat User Interface Keys
The TEC26x7-2 Series Thermostat user interface
consists of three keys on the front cover (as illustrated
in Figure 19). The function of each key is as follows:
• OVERRIDE key overrides the unoccupied mode to
occupied at the local user interface for the
specified TOccTime. (TOccTime is defined by
selecting the appropriate time period in the Inst aller
Configuration Menu.) The OVERRIDE key also
allows access to the Installer Configuration Menu.
See the Configuring the TEC26x7-2 Series
Thermostat section.
Note: If one of the binary inputs is configured to
operate as a remote override contact, this OVERRIDE
key is disabled.
Room Temp
70.0ºF
LEDs indicate
system activity.
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Light-Emitting Diodes (LEDs)
Two LEDs are included to call for heat or call for
cooling:
•The HEAT LED is on when heating or reheat is on.
•The COOL LED is on when cooling is on.
Status Display Menu
The Status Display Menu is displayed during normal
thermostat operation. This menu continuously scrolls
through the following parameters:
• Room Temperature
• System Mode
• Occupancy Status
(Occupied/Unoccupied/Override)
• UP/DOWN arrow keys change the configuration
parameters and activate a setpoint adjustment.
Backlit Liquid Crystal Display (LCD)
The TEC26x7-2 Series Thermostats include a 2-line,
8-character backlit display. Low-level backlighting is
• Applicable Alarms (The backlight lights up as an
alarm condition is displayed.)
Note: An option is available within the Installer
Configuration Menu to lock out the scrolling display and
show only the Room Temperature parameter.
present during normal operation, and it brighten s when
any user interface key is pressed. The backlight returns
to low level when the thermostat is left unattended for
45 seconds.
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions 15
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Configuring the TEC26x7-2 Series Thermostat
The TEC26x7-2 Series Thermostat comes from the
factory with default settings for all configurable
parameters. The default settings are shown in Table 5.
To reconfigure the parameters via the thermostat,
follow the steps in this section.
To access the Installer Configuration Menu, press and
hold the OVERRIDE key for approximately 8 seconds.
Once the Installer Configuration Menu begins, release
and press the OVERRIDE key to scroll through the
parameters listed in Table 5. When the desired
parameter is displayed, use the UP/DOWN arrow keys
to choose the desired selection option. Then press and
release the OVERRIDE key to continue scrolling
through the parameters.
When the thermostat is in the Installer Configuration
Menu and left unattended for approximate ly 8 seconds,
the thermostat reverts to the Status Display Menu.
Configuring Inputs BI1, BI2, and UI3
When BI1 and BI2 are configured for an alarm
condition, an alarm condition is displayed locally when
the input is closed. An alarm message is included on
the scrolling Status Display Menu and when the
message is displayed, the backlight momentarily
lights up.
The UI3 input provides changeover of hot/cold water
switching or supply air temperature monitoring at the
thermostat.
Each input can be configured to the Selection Options
included in Table 5.
Configuring the Output Options (Out1Conf)
For applications that enable heating/cooling operation
from the same output, choose the selection option (2.0)
in the Out1Conf parameter. For applications that
enable heating/cooling operation from differ ent outputs,
choose the selection option (4.0).
Configuring the Sequence of Operation (SeqOpera)
Choose the appropriate sequence of operation. The
modes presented are user-dependent on the sequen ce
of operation selected. For two-pipe applications using a
changeover sensor, choose the selection option
(0): Cooling Only. Changeover occurs between
Cooling Only and Heating Only. See Figure 20
through Figure 25 for sequence of operation examples.
Table 3: Selection Options for Sequence of Operation in Two-Pipe Applications
Selection
Option
(0): Cooling Only See Figure 20. 10: N.O. Cooling
(1): Heating Only See Figure 21. 10: N.O. Heating
(2): Cooling and Reheat See Figure 22. 6 and 7: Reheat
(3): Heating and Reheat See Figure 23. 6 and 7: Reheat
Control
Curve
Terminal Numbers Used (See Table 1 and Figure 5.)
On/Off Control Floating Control Proportional
10: Open Cooling
11: N.C. Cooling
11: N.C. Heating
10: N.O. Cooling
11: N.C. Cooling
10: N.O. Heating
11: N.C. Heating
11: Closed Cooling
10: Open Heating
11: Closed Heating
6 and 7: Reheat
10: Open Cooling
11: Closed Cooling
6 and 7: Reheat
10: Open Heating
11: Closed Heating
0to10VDC Control
10: Proportional Cooling
10: Proportional Heating
6 and 7: Reheat
10: Proportional Cooling
6 and 7: Reheat
10: Proportional Heating
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions16
Page 17
Table 4: Selection Options for Sequence of Operation in Four-Pipe Applications
Selection
Option
(0): Cooling Only See Figure 20. 10: Normally Open
(1): Heating Only See Figure 21. 8: N.O. Heating
(2): Cooling and Reheat See Figure 22. 6 and 7: Reheat
(3): Heating and Reheat See Figure 23. 6 and 7: Reheat
(4): Cool/Heat Four-Pipe See Figure 24. 8: N.O. Heating
(5): Cool/Heat Four-Pipe
and Reheat
Control
Curve
Terminal Numbers Used (See Table 1 and Figure 5.)
On/Off Control Floating Control Proportional
(N.O.) Cooling
11: Normally Closed
(N.C.) Cooling
9: N.C. Heating
10: N.O. Cooling
11: N.C. Cooling
8: N.O. Heating
9: N.C. Heating
9: N.C. Heating
10: N.O. Cooling
11: N.C. Cooling
See Figure 25. 6 and 7: Reheat
8: N.O. Heating
9: N.C. Heating
10: N.O. Cooling
11: N.C. Cooling
10: Open Cooling
11: Closed Cooling
8: Open Heating
9: Closed Heating
6 and 7: Reheat
10: Open Cooling
11: Closed Cooling
6 and 7: Reheat
8: Open Heating
9: Closed Heating
8: Open Heating
9: Closed Heating
10: Open Cooling
11: Closed Cooling
6 and 7: Reheat
8: Open Heating
9: Closed Heating
10: Open Cooling
11: Closed Cooling
0to10VDC Control
10: Proportional Cooling
9: Proportional Heating
6 and 7: Reheat
10: Proportional Cooling
6 and 7: Reheat
9: Proportional Heating
9: Proportional Heating
10: Proportional Cooling
6 and 7: Reheat
9: Proportional Heating
10: Proportional Cooling
Device Opened
Cooling Setpoint
Device Opened
On/Off, Floating,
or Propor tional
Device Closed
Tempe r at ur e Increase
(Increments of 1F°/0.5C°)
Figure 20: Cooling Only,
Two- or Four-Pipe Applications
Heating Setpoint
On/Off, Floating,
or Propor t ional
Output
Temperature Increase
(Increments of 1F°/0.5C°)
Device Closed
Output
On/Off, Floating,
Heating Output
or Propor t ional
Outputs
Heating Setpoint
Cooling Output
Cooling Setpoint
Deadband
Device
Opened
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On
On
Reheat
Off
Off
Device
Closed
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Tempe r at ur e Increase
(Increments of 1F°/0.5C°)
Figure 22: Cooling with Reheat,
Two- or Four-Pipe Applications
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Figure 21: Heating Only,
Two- or Four-Pipe Applications
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions 17
Page 18
On
On
Reheat
Off
On/Off, Floating,
or Propor t ional
Outputs
Heating Output
Cooling Output
Off
On/Off, Floating,
or Propor t ional
Output
Temperature Increase
(Increments of 1F°/0.5C°)
Figure 23: Heating with Reheat,
Two- or Four-Pipe Applications
Heating Setpoint
Device
Opened
On
On
Reheat
Output
Off
Off
100%
0%
Heating Setpoint
Cooling Setpoint
Deadband
Device
Opened
On
On
Off
Device
Off
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Tempe r at ur e Increase
(Increments of 1F°/0.5C°)
Figure 24: Heating/Cooling,
Closed
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Four-Pipe Applications
On/Off, Floating,
or Propor t ional
Outputs
Cooling Setpoint
Deadband
Heatin g O ut put
Cooling Output
Device
Opened
Device
Closed
Tempe rature Increase
(Increments of 1F°/0.5C°)
Device
Closed
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Figure 25: Heating/Cooling with Reheat,
Four-Pipe Applications
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions18
Page 19
Table 5: Installer Configuration Menu (Part 1 of 4)
Parameter
Description and Default Selection Options
Appearing
on Display
Com addr MS/TP address at the thermostat;
coincides with the address assigned
at the supervisory controller.
Default: 4
BI1 Configuration of Binary Input 1.
Default: None
BI2 Configuration of Binary Input 2.
Default: None
Range: 004 to 127
(None): No function is associated with an input.
(Rem NSB): Remote Night Setback (NSB) via a time clock input, an
occupancy sensor, or from a voltage-free contact.
Contact open = Occupied; contact closed = Unoccupied.
(MotionNO*): Temporary occupancy request via a motion detector
input. Contact open = Unoccupied. When the contact closes, the
thermostat goes into the occupied mode for a specified TOccTime.
Once the TOccTime begins, the thermostat remains in the occupied
mode if the contact is open, until the TOccTime expires.
(MotionNC*): Temporary occupancy request via a motion detector
input. Contact closed = Unoccupied. When the contact opens, the
thermostat goes into the occupied mode for a specified TOccTime.
Once the TOccTime begins, the thermostat remains in the occupied
mode if the contact is closed, until the TOccTime expires.
(Window**): Cancels the thermostat heating or cooling action when
a window is open. A Window alarm is displayed indicating that the
window needs to be closed to resume heating or cooling.
* These settings disable any local override function.
** When this setting is selected, the heating and or cooling outputs
are enabled only when the contact is closed.
(None): No function is associated with an input.
(Door Dry): Door contact only has an effect if BI1 is set to
MotionNO or MotionNC. (See the BI1 parameter earlier in this
table.) The occupancy is now dictated via BI1 and BI2. Any motion
detected sets the zone to Occupied status. The thermostat remains
in the occupied mode until a DoorOpen is detected, at which point
the thermostat goes to the unoccupied mode. If the door stays open
more than the specified door time, the thermostat will remain
unoccupied. (See the Door Time parameter later in this table.)
(RemOVR): Temporary occupancy request via a remote input. This
override function is controlled by a manual remote occupancy
override. When enabled, this condition disables the override
capability of the thermostat.
(Filter): A Filter alarm is displayed. This alarm can be connected to
a differential pressure switch that monitors a filter.
(Service): A Service alarm is displayed on the thermostat when the
input is energized. This input can be tied into the air conditioning
unit control card, which provides an alarm should there be a
malfunction.
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions 19
Page 20
Table 5: Installer Configuration Menu (Part 2 of 4)
Parameter
Description and Default Selection Options
Appearing
on Display
UI3 Configuration of Universal Input 3.
Default: None
MenuScro Gives the option of having the
display continuously scroll the
parameters.
Default: on
C or F Provides temperature scale options
for display.
Default: °F
Lockout Selectable Lockout Levels for
limiting end user keypad interaction.
Default: 0
Out1Conf Defines the type of operation
needed for Output 1.
Default: 4.0
CntrlTyp Defines the control output for the
type of valves used in the
installation (TEC2627-2 model).
Default:
Floating
(None): No function is associated with an input.
(COC/NH): Changeover Contact/Normally Heat: A dry contact input
is used to signal seasonal hot/cold water changeover. The contact
closes when cold water is present. Valid only for two-pipe systems.
(COC/NC): Changeover Contact/Normally Cool: A dry contact input
is used to signal seasonal hot/cold water changeover. The contact
closes when hot water is present. Valid only for two-pipe systems.
(COS): Changeover Analog Sensor: Used for hot/cold water
changeover switching. Valid only for two-pipe systems.
Note: Choose the selection option (0): Cooling Only for the
(SS): Supply Air Sensor Monitoring
(off): The scroll is inactive.
(on): The scroll is active.
(°C): Celsius scale
(°F): Fahrenheit scale
Lockout
Level
* If lockout level (2) or (3) is selected, the lockout functions like
lockout level (0) or (1) respectively.
(2.0): Limits the number of sequences of operation available
from 0 to 3, and enables heat/cool operation from the same output.
(4.0): Allows access to all sequences of operation from 0 to 5, and
enables heat/cool operation from different outputs.
(On/Off): For Normally Open (N.O.) or Normally Closed (N.C.)
24 VAC two-position valves.
(Floating): For proportional three-wire control of 24 VAC floating
valves.
SeqOpera parameter to allow changeover to occur between
Cooling Only and Heating Only. Choose the selection
option (2): Cooling and Reheat to allow changeover to
occur between Cooling and Reheat and Heating and
Reheat.
Function
Unoccupied Override Occupied Temperature
Setpoints
(0) Access Access
(1) No Access Access
(2*) This lockout level is not used.
(3*) This lockout level is not used.
(4) Access No Access
(5) No Access No Access
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions20
Page 21
Table 5: Installer Configuration Menu (Part 3 of 4)
Parameter
Description and Default Selection Options
Appearing
on Display
SeqOpera Determines the sequence of
operation.
Default: 1
Unocc HT Sets the Unoccupied Heating
setpoint value.
Default: 62.0°F/16.5°C
Unocc CL Sets the Unoccupied Cooling
setpoint value.
Default: 80.0°F/26.5°C
Heat max Sets the Occupied and Unoccupied
maximum Heating setpoint values.
Default: 90.0°F/32.0°C
Cool min Sets the Occupied and Unoccupied
minimum Cooling setpoint values.
Default: 54.0°F/12.0°C
Set type Provides the option of temporarily
changing the heating or cooling
setpoint by pressing the UP/DOWN
arrow keys.
Default: permnent
TOccTime Sets the duration of the Temporary
Occupancy Time when the heating
or cooling setpoints in the Occupied
mode are established by:
• an Override Function enabled in
the Main User Menu (when the
thermostat is in the Unoccupied
mode)
• a temporary heating or cooling
setpoint
Default: 2.0 hrs
DoorTime Engages the Unoccupied mode if
the door stays open minimally for
the time specified.
Default: 2.0 min
Deadband Sets the minimum deadband
between the heating and cooling
setpoints.
Default: 2.0F°/1.0C°
(0): Cooling Only (Off-Cool). The default is Cool.
(1): Heating Only (Off-Heat). The default is Heat.
(2): Cooling and Reheat (Off-Auto-Heat-Cool). The default is Heat.
(3): Heating and Reheat (Off-Heat). The default is Heat.
(4*): Cool/Heat Four-Pipe (Off-Auto-Heat-Cool). The default is Heat.
(5*): Cool/Heat Four-Pipe and Reheat (Off-Auto-Heat-Cool). The
default is Heat.
* Selection option (4.0) for Out1Conf only. (See Out1Conf parameter
earlier in this table.)
Note: Choose the selection option (0): Cooling Only when using a
Range: 40.0°F/4.5°C to
90.0°F/32.0°C
Range: 54.0°F/12.0°C to
100.0°F/37.5°C
Range: 40.0°F/4.5°C to
90.0°F/32.0°C
Range: 54.0°F/12.0°C to
100.0°F/37.5°C
(temporar): Local changes to the heating or coolin g setpoints are
temporary, and remain effective for the specified TOccTime.
(permnent): Local changes to the heating or cooling setpoints are
permanently stored in the thermostat memory.
Range: 0.0 to 24.0 hrs in 1-hour increments
Range: 1.0 to 10.0 min
Range: 2.0F°/1.0C° to 5.0F°/2.5C° (adjustable in 1.0F°/0.5C°
increments)
changeover sensor to allow changeover to occur between
Cooling Only and Heating Only. Choose the selection
option (2): Cooling and Reheat when using a changeover
sensor to allow changeover to occur between Cooling and
Reheat and Heating and Reheat.
Note: When adjusting the
temperature, press
the UP/DOWN
arrow keys to
change the
temperature in
0.5F°/0.5C°
increments; press
and hold the
UP/DOWN arrow
keys to change the
temperature in
5.0F°/5.0C°
increments.
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions 21
Page 22
Table 5: Installer Configuration Menu (Part 4 of 4)
Parameter
Description and Default Selection Options
Appearing
on Display
Cal RS Sets the desired room air sensor
calibration (offset). The offset can
be added to or subtracted from the
actual displayed room temperature.
Default: 0.0F°/0.0C°
Aux cont Determines the auxiliary contact
function and configuration.
Default: 0
FL time Sets the maximum actuator stroke
timing (floating ContrlTyp
TEC2627-2 model).
Default: 1.5 min
Cph Sets the maximum number of cycles
per hour (on/off CntrlTyp
TEC2627-2 model).
Default: 4
RA/DA Choice of reverse or direct acting
analog output signal (TEC2647-2
model).
Default: DA
Reheat Sets the duty cycle time for reheat
output (if Option 2, 3, or 5 is chosen
in the SeqOpera parameter).
Default: 0
UI3 dis Displays the supply or changeover
temperature when UI3 is configured
as an analog input (supply sensor or
changeover sensor).
Default: -40°F/-40°C
Range: -5.0F°/-2.5C° to 5.0F°/2.5C° (adjustable in 1.0F°/0.5C°
increments)
* If option (3) or (4) is selected, the option functions like
option (1) or (2) respectively.
Range: 0.5 to 9.0 min (adjustable in 0.5 minute increments)
Range: 3 to 8 cycles per hour
(RA): Reverse acting, 0 to 100% = 10 to 0 VDC
(DA): Direct acting, 0 to 100% = 0 to 10 VDC
(1): 10 seconds (six cycles per minute), for various equipment with
solid-state relays that withstand short duty cycles such as electric
heat.
(0): 15 minutes (four cycles per hour), for various equipment with
mechanical relays or contactors controlling mechanical reheat
systems.
Used as a diagnostic/service help, to troubleshoot and diagnose
sensor operation.
(0) Not used,
or used for
reheat
(1) Auxiliary
N.O.
(2) Auxiliary
N.C.
(3*) This selection option is not used.
(4*) This selection option is not used.
(5) Auxiliary On/Off control through the
auxiliary network command. The output
can be commanded through the network
for any required auxiliary functions via a
separate and dedicated network
variable.
If the Sequence of Operation is set to
reheat (2, 3, or 5), ignore this parameter.
Occupied = contact
closed
Unoccupied = contact
open
Occupied = contact open
Unoccupied = contact
closed
The output
aligns with
occupancy.
The output
aligns with
the
secondary
network
occupancy
command.
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions22
Page 23
Accessories
All the accessories in Table 6 include mounting
hardware; contact the nearest Johnson Controls®
representative to order any of these parts.
Note: Review the technical specifications of the
accessories prior to their use in an application.
Repair Information
If the TEC26x7-2 Series Thermostat fails to operate
within its specifications, see Table 7 for troubleshooting
details and Table 8 for display messaging. For a
replacement thermostat, contact the nearest
Johnson Controls representative.
Table 6: Accessories (Order Separately)
Code Number Description
SEN-600-1 Remote Indoor Air Temperature Sensor
TE-6361M-1
SEN-600-4 Remote Indoor Air Temperature Sensor with Occupancy Override and LED
TE-636S-1 Strap-Mount Temperature Sensor
MS-BACEOL-0 RS485 End-of-Line Terminator
1. Additional TE-636xx-x Series 10k ohm Johnson Controls Type II Thermistor Sensors are available; refer to the
TE-6300 Series Temperature Sensors Product Bulletin (LIT-216320) for more details.
1
Duct Mount Air Temperature Sensor
Table 7: Troubleshooting Details1 (Part 1 of 2)
Symptom Probable Causes
Multiple
Symptoms
Poor Performance See the probable causes listed in the Multiple Symptoms section earlier in this table.
Thermostat Goes
Offline
Excessive bus errors may be occurring.
A device may have been added or changed with a duplicate address (may not be the same address as
some devices having problems, and may have happened sometime before the problem was noticed).
Wiring errors or wire problems may exist.
The baud rate may have been changed on some devices on the network, but not all devices.
Max_Master may have been changed incorrectly (may have happened sometime before the problem
was noticed).
A download may be in progress.
There may be a fault at a device.
A repeater may be needed or may be configured incorrectly.
There may be a duplicate device object name or instance.
Excessive bus traffic may exist (bus overload).
The baud rate may be set too low.
There may be too many devices on the network.
There may be unaccounted devices on the network (not mapped to the NAE).
There may be unusually slow devices on the network or devices that are slow to respond.
See the probable causes listed in the Multiple Symptoms section earlier in this table.
A power failure or other failure may have occurred at the thermostat.
Communication may have been disabled at the thermostat.
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions 23
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Table 7: Troubleshooting Details1 (Part 2 of 2)
Symptom Probable Causes
Thermostat Will
Not Come Online
1. For common MS/TP troubleshooting information, refer to the MS/TP Commun ications Bus Technical Bulletin
(LIT-12011034).
See the probable causes listed in the Multiple Symp toms section earlier in this table.
A thermostat may be connected to the wrong bus.
A baud rate may be specified in the new thermostat that is incompatible with the running network.
No device on the network is configured to us e a specific baud rate (normally the NAE), but all devices
are set to use auto baud. At least one device, typicall y the bus supervisor (NAE), must have an
assigned baud rate. Set the baud rate in the bus supervisor and set all other devices to auto baud.
Table 8: Display Messages
Display Function
Service Indicates that there is a service alarm in accordance with the programmable Binary Input (BI2).
Filter Indicates that the filter(s) is dirty in accordance with the programmable Binary Input (BI2).
Window Indicates that an outside window or door is open and has cancelled the thermostat heating or cooling
action in accordance with the programmable Binary Input (BI1).
Technical Specifications
TEC26x7-2 Series BACnet MS/TP Networked Thermostats with Two Outputs (Part 1 of 2)
Power Requirements 19 to 30 VAC, 50/60 Hz, 2 VA (Terminals 4 and 5) at 24 VAC Nominal, Class 2 or
Relay/Triac
Contact
Rating
Analog
Output Rating
Auxiliary
Output Rating
Digital Input s Voltage-Free Contacts across Terminal Scom to Terminals BI1, BI2, or UI3
Temperature Sensor Type Local 10k ohm Negative Temperature Coefficient (NTC) Thermistor
Wire Size 18 AWG (1.0 mm Diameter) Maximum, 22 AWG (0.6 mm Diameter) Recommended
MS/TP Network Guidelines 32 Devices Maximum; 4,000 ft (1,219 m) Maximum Cable Length
Temperature
Range
Accuracy ±0.9F°/±0.5C° at 70.0°F/21.0°C Typical Calibrated
Minimum Deadband 2F°/1C° between Heating and Cooling
Ambient
Conditions
On/Off and
Floating
Control
Proportional
Control
Triac Output 30 VAC, 1.0 A Maximum, 3.0 A In-Rush
Backlit
Display
Heating
Control
Cooling
Control
Operating 32 to 122°F (0 to 50°C); 95% RH Maximum, Noncondensing
Storage -22 to 122°F (-30 to 50°C); 95% RH Maximum, Noncondensing
Safety Extra-Low Voltage (SEL V)
30 VAC, 1.0 A Maximum, 15 mA Minimum, 3.0 A In-Rush, Class 2 or SELV
0 to 10 VDC into 2k ohm Resistance (Minimum)
-40.0°F/-40.0°C to 122.0°F/50.0°C in 0.5° Increments
40.0°F/4.5°C to 90.0°F/32.0°C
54.0°F/12.0°C to 100.0°F/38.0°C
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions24
Page 25
TEC26x7-2 Series BACnet MS/TP Networked Thermostats with Two Outputs (Part 2 of 2)
Compliance United States UL Listed, File E27734, CCN XAPX,
Under UL 873, Temperature Indicating and Regulating Equipment
FCC Compliant to CFR 47, Part 15, Subpart B, Class A
Canada UL Listed, File E27734, CCN XAPX7,
Europe CE Mark, EMC Directive 89/336/EEC
Australia and
New Zealand
Shipping Weight 0.75 lb (0.34 kg)
The performance specifications are nominal and conform to acceptable industry standards. For application 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.
Under CAN/CSA C22.2 No. 24, Temperature Indicating and Regulating Equipment
Industry Canada, ICES-003
C-Tick Mark, Australia/NZ Emissions Compliant
Controls Group
507 E. Michigan Street
Milwaukee, WI 53202 © 2006 Johnson Controls, Inc.
TEC26x7-2 Series BACnet® MS/TP Networked Thermostats with Two Outputs Installation Instructions 25
Published in U.S.A. www.johnsoncontrols.com
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