Johnson Controls TEC2627-2, TEC2647-2 Installation Instructions And Operators Manual

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

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

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

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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

–

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

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

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

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

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