Honeywell TB7980 Thermostat User Manual

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TB6980/TB7980  
Installation and User Guide  
ZonePRO Thermostats  
1
. Introduction  
The TB6980/TB7980 digital thermostats provide proportional plus  
integral individual space temperature control in zoned commercial  
HVAC systems such as hydronic and pressure dependent VAV with  
or without reheat. There are four different models:  
Configuration and status display  
•
•
TB7980A (single output, modulating)  
TB7980B (multiple output modulating)  
•
•
TB6980A (single output, floating)  
TB6980B (multiple output, floating)  
Heating mode  
Cooling mode  
Depending on the models, the thermostat can have up to three out-  
puts for the following applications:  
Temperature display  
Output power display  
Floating or Modulating damper/valve actuator control  
Damper/valve actuator control with duct reheat and auxiliary  
heat (B models only)  
Temperature  
adjustment  
button  
Hydronic systems (room control, perimeter heating and cool-  
ing)  
Override button  
Accessories  
R841 family of electromechanical relays  
T7770A3002 remote room sensor  
50014156-002 remote room sensor  
32004800-001 bare thermistor  
50014157-001 duct temperature sensor  
2
. Installation  
2
.1 Mounting Instructions  
2.2 Terminal Designations  
1.  
Remove the thermostat from its base by unscrewing the cap-  
tive screw and tilting the bottom of the thermostat up. The  
screw cannot be completely removed.  
The designations of the terminals vary according to the particular  
model of thermostat. Refer to the following table for the description  
of each terminal.  
TERMINAL  
DESCRIPTION  
1
2
24 VAC  
COM  
Power supply  
3
4
AN1  
COM  
TB7980 models  
TB6980 models  
Output 1  
3
4
OPEN  
CLOSED  
5
6
T2/AN2  
T2/COM  
Output 2 (TB6980B and TB7980B models)  
7
8
T3  
T3  
Output 3 (TB6980B and TB7980B models)  
9
1
COM  
External sensor input. (For applications requiring  
0
SENSOR an external sensor, see section 4.2.)  
2.  
3.  
4.  
Pass the wires through the center hole of the base and secure  
the base to the wall or onto an electrical box.  
9
COM  
Mode Changeover input (N.O. contact). See sec-  
tion 5.5.2.  
Wire the thermostat. See section 2.2 for terminal designations  
and section 3 for typical wiring diagrams.  
Reinstall the thermostat onto its base and secure with the cap-  
tive screw.  
11 C-Over  
9
1
COM  
NSB  
Night Setback activation input (N.O. contact).  
See section 5.6.  
2
Note: To configure the terminals, see section 4.  
TB6980/TB7980  
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3
. Typical Applications  
TB6980B  
TB7980B  
FIGURE 1: Damper control with electric reheat and auxiliary  
baseboard heating.  
FIGURE 2: Damper control with electric reheat and auxiliary  
hot-water heating  
TB6980B  
TB7980B  
FIGURE 3: Damper control with automatic changeover,  
electric reheat and central cooling  
FIGURE 4: Temperature control of fresh air supply  
TB7980B  
TB7980B  
CAUTION  
CAUTION  
Do not connect  
common to ground  
Do not connect  
common to ground  
FIGURE 5: Changeover and NSB inputs sharing the same  
FIGURE 6: Changeover and NSB inputs using different 24-Vac  
transformers  
24-Vac transformer  
TB6980/TB7980  
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4
. Configuration  
4
.1 Configuration Menus (See following pages for explanations)  
NOTE: Factory settings are inside the shaded cells.  
1
.
.
Remove the thermostat from its base and  
set the SW2 switch to MENU.  
TB7980A model  
2
Reinstall the thermostat. The thermostat is  
now in configuration mode. The first digit  
flashes to indicate that the first item of the  
menu can now be modified.  
Default mode &  
Output 1 type  
Output 1  
min. opening  
(section 4.3.2)  
Maximum  
setpoint  
(section 4.6)  
Minimum  
setpoint  
(section 4.6)  
Application  
NSB value  
(section 5.6)  
(section 4.2)  
(
section 4.3.1)  
Cool / 0-10V  
Heat / 0-10 V  
Cool / 2-10 V  
Heat / 2-10 V  
0
1
2
3
4
5
Internal sensor  
Room  
0
1
2
3
1
2
3
4
5
6
7
8
9
2°F (1°C)  
4°F (2°C)  
6°F (3°C)  
8°F (4°C)  
10°F (5°C)  
12°F (6°C)  
14°F (7°C)  
16°F (8°C)  
18°F (9°C)  
0
1
2
3
4
5
0%  
3.  
4.  
5.  
To modify the setting, use the up/down  
arrows. Refer to the adjacent tables.  
Press Override to save the new setting and  
go to the next item.  
10%  
20%  
30%  
40%  
50%  
Can be set  
between 95°F  
35°C) and  
’minimum  
Can be set  
between 50°F  
(10°C) and  
’’maximum  
setpoint - 1’’  
Return  
(
’
Supply  
Auto changeover  
Limited cooling  
setpoint + 1’’  
Repeat steps 3 and 4 for remaining items.  
Default value  
Default value  
is 95°F (35°C) is 50°F (10°C) 6. When the configuration is done, set the  
SW2 switch back to NORMAL.  
TB6980A model  
ABBREVIATIONS  
NSB  
- Night setback (number of  
degrees the thermostat will be set back  
upon receiving a setback signal)  
SSR - Solid state relay (used with fast  
cycling electric heaters, SSR's are a  
quiet alternative to electromechanical  
relays. They're typically included with  
electric duct reheat equipment)  
SCR - Silicon controlled rectifier (similar  
to an SSR, SCR's are also quiet and  
capable of switching very high current. If  
used, they're usually included with the  
equipment)  
Output 1  
min. opening  
section 4.3.2)  
Output 1  
opening time  
(section 4.3.3)  
Maximum  
setpoint  
(section 4.6)  
Minimum  
setpoint  
(section 4.6)  
Application  
Default mode  
(section 4.3.1)  
NSB value  
(section 5.6)  
(section 4.2)  
(
0
1
2
3
4
5
Internal sensor  
Room  
0
Cool  
1
2
3
4
5
6
7
8
9
2°F (1°C)  
4°F (2°C)  
6°F (3°C)  
8°F (4°C)  
10°F (5°C)  
12°F (6°C)  
14°F (7°C)  
16°F (8°C)  
18°F (9°C)  
0
1
2
3
4
5
0%  
0
1
2
3
4
5
6
7
8
80  
1
Heat  
10%  
90  
Can be set  
between 95°F  
35°C) and  
’minimum  
Can be set  
between 50°F  
(10°C) and  
’’maximum  
setpoint - 1’’  
Return  
20%  
100  
110  
120  
130  
140  
150  
160  
(
’
Supply  
30%  
Auto changeover  
Limited cooling  
40%  
setpoint + 1’’  
50%  
Default value  
is 95°F (35°C) is 50°F (10°C)  
Default value  
N.C. - Normally closed  
N.O. - Normally open  
TB7980B model  
Default mode &  
Output 1 type  
Output 3  
activation  
(section 4.5)  
Output 1  
min. opening  
(section 4.3.2)  
Maximum  
setpoint  
(section 4.6)  
Minimum  
setpoint  
(section 4.6)  
Output 2 typea  
(section 4.4)  
Application  
Output 3 type  
(section 4.5)  
NSB value  
(section 5.6)  
(section 4.2)  
(
section 4.3.1)  
Cool / 0-10V  
Heat / 0-10 V  
Cool / 2-10 V  
Heat / 2-10 V  
0
1
2
3
4
5
Internal sensor  
Room  
0
1
2
3
0
Not used  
0
Not used  
SSR 24 VAC  
N.C. Valve  
N.O. Valve  
Mech. relay  
Contact  
0
1
2
3
4
5
6
7
8
9
100%  
10%  
20%  
30%  
40%  
50%  
60%  
70%  
80%  
90%  
1
2
3
4
5
6
7
8
9
2°F (1°C)  
4°F (2°C)  
6°F (3°C)  
8°F (4°C)  
10°F (5°C)  
12°F (6°C)  
14°F (7°C)  
16°F (8°C)  
18°F (9°C)  
0
1
2
3
4
5
0%  
1
2
3
4
5
6
7
8
SSR 24 VAC  
N.C. Valve  
N.O. Valve  
Mech. relay  
SSR 3-32 V  
SCR 0-10 V  
Act. 0-10 V  
Act. / 2-10 V  
1
2
3
4
5
10%  
20%  
30%  
40%  
50%  
Can be set  
between 95°F  
35°C) and  
’’minimum  
Can be set  
between 50°F  
(10°C) and  
’’maximum  
setpoint - 1’’  
Return  
Supply  
(
Auto changeover  
Limited cooling  
setpoint + 1’’  
Default value  
is 95°F (35°C) is 50°F (10°C)  
Default value  
a. If Output 2 type is set to 0-4, set the SW6 switch to Triac. If the output type is set to 5-8, set the switch to Analog (see section 4.7).  
TB6980B model  
Output 3  
activation  
section 4.5)  
Output 1  
min. opening  
(section 4.3.2)  
Output 1  
opening time  
(section 4.3.3)  
Maximum  
setpoint  
(section 4.6) (section 4.6)  
Minimum  
setpoint  
Output 2 typea  
(section 4.4)  
Application  
Default mode  
(section 4.3.1)  
Output 3 type  
(section 4.5)  
NSB value  
(section 5.6)  
(section 4.2)  
(
0
1
2
3
4
5
Internal sensor  
Room  
0
Cool  
0
1
2
3
4
5
6
7
8
Not used  
0
1
2
3
4
5
Not used  
SSR 24 VAC  
N.C. Valve  
N.O. Valve  
Mech. relay  
Contact  
0
1
2
3
4
5
6
7
8
9
100%  
10%  
20%  
30%  
40%  
50%  
60%  
70%  
80%  
90%  
1
2
3
4
5
6
7
8
9
2°F (1°C)  
4°F (2°C)  
6°F (3°C)  
8°F (4°C)  
10°F (5°C)  
12°F (6°C)  
14°F (7°C)  
16°F (8°C)  
18°F (9°C)  
0
1
2
3
4
5
0%  
0
80  
1
Heat  
SSR 24 VAC  
N.C. Valve  
N.O. Valve  
Mech. relay  
SSR 3-32 V  
SCR 0-10 V  
Act. 0-10 V  
Act. / 2-10 V  
10%  
20%  
30%  
40%  
50%  
1
2
3
4
5
6
7
8
90  
Can be set  
between  
Can be set  
between  
Return  
100  
110  
120  
130  
140  
150  
160  
95°F (35°C) 50°F (10°C)  
Supply  
and  
’’minimum  
setpoint + 1’’ setpoint - 1’’  
and  
’’maximum  
Auto changeover  
Limited cooling  
Default  
value is 95°F value is 50°F  
(35°C) (10°C)  
Default  
a. If Output 2 type is set to 0-4, set the SW6 switch to Triac. If the output type is set to 5-8, set the switch to Analog (see section 4.7).  
TB6980/TB7980  
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4
.2 Application Types  
The following table shows the different default modes, the different  
output types for Output 1, and their corresponding settings in the  
configuration menu.  
The following table shows the different thermostat applications and  
their corresponding settings in the configuration menu.  
Menu setting  
TB7980 models  
TB6980 models  
Menu setting  
Description  
Cool / 0-10 V analog  
max. of 10 min. refresh)  
Cool  
0
Internal  
To control the ambient temperature using the internal  
(built-in) sensor  
(
(24 V tri-state floating)  
0
sensor  
Room  
Heat / 0-10 V analog  
(max. of 10 min. refresh)  
Heat  
1
2
3
To control the ambient temperature using the  
50014156-002 temperature sensor (the internal sensor  
is not used)  
(24 V tri-state floating)  
1
2
3
4
Cool / 2-10 V analog  
(
max. of 10 min. refresh)  
Heat / 2-10 V analog  
max. of 10 min. refresh)  
To control the temperature at the air return using the  
50014157-001 temperature sensor (the internal sensor  
is not used)  
Air return  
Air supply  
(
4
.3.2 Minimum Opening  
To control the temperature at the fresh air supply using  
the 50014157-001 temperature sensor (the internal  
sensor is not used)  
The minimum damper opening can be set between 0 and 50 %.  
Note: It is not recommended to set the minimum damper opening to  
0 % (fully closed) when a duct heater is connected to Output 2 or 3.  
To control the ambient temperature using the internal  
sensor. The 50014157-001 temperature sensor is used  
for automatic changeover. See section 5.5.1.  
Automatic  
changeover  
4.3.3 Opening time (TB6980 models only)  
To use the outdoor air for cooling whenever possible.  
The 50014157-001 temperature sensor is used to  
measure the outdoor air temperature. The internal  
temperature sensor measures the room temperature  
which is then compared with the setpoint. If the room  
temperature is lower than the setpoint, the air intake  
damper remains closed. If the room temperature is  
higher than the setpoint, the latter is then compared with  
the outdoor temperature. If the fresh air temperature is  
lower than the setpoint by more than 5°F(3°C), the  
damper opens to allow cool air in.  
The damper opening time can be set between 80 and 160 seconds.  
4.4 Output 2 (models TB6980B and TB7980B)  
Output 2 controls heating only, regardless of the thermostat’s mode.  
When the thermostat is in heat mode, Output 2 is activated as soon  
as Output 1 reaches its full capacity. When the thermostat is in cool  
mode, Output 2 is activated when the measured temperature drops  
below the setpoint.  
Limited  
cooling  
5
4.3 Output 1  
Output 1 is used to control a damper. It controls heating when the  
thermostat is in heat mode or cooling when the thermostat is in cool  
mode.  
The following table shows the output types for Output 2 and their  
corresponding settings in the configuration menu.  
Menu setting  
Description  
0
1
Not used  
24 VAC pulsed (triac) / 1 sec. cycle  
4 VAC pulsed (triac) / 10 min. cycle / direct action  
Set the following configuration parameters:  
2
2
3
•
•
•
•
Default mode  
Output type (TB7980 models only)  
Minimum opening  
(e.g., N.C. thermal valve)  
24 VAC pulsed (triac) / 10 min. cycle / reverse action  
(
e.g., N.O. thermal valve)  
Opening time (TB6980 models only)  
24 VAC pulsed (triac) / 15 min. cycle (e.g., mechanical  
relay such as R841)  
4
5
6
4
.3.1 Default Mode / Output Type  
0-10 V pulsed / 1 sec. cycle  
The default mode (heat/cool) is used for the following:  
0
-10 V analog / 1 sec. refresh  
(e.g., SCR controlled device such as a re-heater)  
•
•
The default mode is the thermostat’s mode at power-up.  
7
8
0-10 V analog / max. of 10 min. refresh (e.g., valve)  
2-10 V analog / max. of 10 min. refresh (e.g., damper)  
The default mode is the active mode when the N.O. changeover  
contact is open (see section 5.5.2).  
•
When configured as a contact (see section 4.5), Output 3 controls  
either heating or cooling depending on whether the default mode  
is set to heat or cool respectively.  
Note: If 0-4 is selected, set the SW6 switch to Triac. If 5-8 is  
selected, set the switch to Analog (see section 4.7)  
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4
.5 Output 3 (models TB6980B and TB7980B)  
4.7 DIP Switches  
The following table shows the output types for Output 3 and their  
corresponding settings in the configuration menu.  
Three switches at the back of the control module are used to select  
various options.  
Temperature Display (SW1)  
Menu setting  
Description  
Selects the desired temperature display (°C or °F).  
Access Mode (SW2)  
0
1
Not used  
24 VAC pulsed (triac) / 1 sec. cycle  
4 VAC pulsed (triac) / 10 min. cycle / direct action  
e.g., N.C. thermal valve)  
4 VAC pulsed (triac) / 10 min. cycle / reverse action  
e.g., N.O. thermal valve)  
4 VAC pulsed (triac) / 15 min. cycle (e.g., mechanical  
Selects the operation mode (NORM) or the configuration mode  
2
(
(
MENU).  
2
3
4
5
•
Place the switch to MENU to access the configuration menu.  
2
(
• Place the switch to NORM for normal display.  
Output 2 Type (SW6)  
2
relay such as R841)  
Sets Output 2 type (Analog or Triac).  
N.O. contact (The contact closes when Output 1 reaches  
or exceeds set percentage. See section 4.1.)  
WARNING: Place the switch according to the type of device  
(Analog or Triac) connected to Output 2. Failure to do so can  
When any setting between 1 and 4 is selected, Output 3 controls  
heating only, regardless of the thermostat’s mode.  
result in thermostat damage.  
5
.Operation  
5.1 Power-Up  
Upon power-up, the thermostat undergoes a series of test before  
displaying the actual temperature.  
Note: On the TB6980A and TB6980B models, at power-up, the  
message OPEN appears at the top of the screen during the calibra-  
tion of the damper opening. This can last up to 3 minutes.  
5
.2 Backlight  
To turn the backlight on, press any button. The display will illuminate  
for 12 seconds.  
When setting 5 is selected, Output 3 controls heating or cooling  
depending on whether the default mode has been set to heat or  
cool respectively (see section 4.3.1). For example, if the default  
mode has been set to heat mode, the contact remains opened when  
the thermostat is in cool mode. When the thermostat is in heat  
mode, the contact closes when Output 1 reaches a percentage of its  
capacity, set via the configuration menu.  
5.3 Temperature Display and Setting  
The thermostat usually displays the actual temperature. To view the  
setpoint, press once on one of the  
appears for 5 seconds and is indicated by the display. During the  
setpoint display, press one of the buttons to change it.  
buttons. The setpoint  
Note: The temperature setpoint is automatically increased or  
decreased by 2°F (1°C) when the controller switches to heating  
mode or to cooling mode respectively. For example, if the setpoint is  
at 77°F (25°C) in heating mode, it will become 79°F (26°C) in cool-  
ing mode and will return to 77°F (25°C) when the controller is back  
in heating mode.  
5.4 Output Display  
The bar graph represents the voltage for an analog out-  
put or the duty cycle for a triac output. The bar graph  
usually shows Output 1 power (% of damper opening).  
To view Output 2 or 3, press Override for 2 seconds to  
enter the diagnostic mode. Press Override momentarily  
to switch between the three output graphs. To exit the  
diagnostic mode, press Override for 2 seconds or wait  
for 1 minute for the mode to exit automatically.  
4
.6 Minimum and Maximum Setpoints  
The minimum and maximum setpoints are factory-set at 50°F  
10°C) and 95°F (35°C). The maximum setpoint can be set between  
5°F (35°C) and “minimum setpoint + 1”. The minimum setpoint can  
(
9
5.5 Mode Changeover  
be set between 50°F (10°C) and “maximum setpoint - 1”.  
The thermostat can switch between heat mode and cool mode  
either via:  
•
•
the automatic changeover  
the changeover input  
TB6980/TB7980  
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5
.5.1 Automatic changeover  
Humidity limits: 0 to 95% R.H., non-condensing  
Dimensions: 2.7 x 4.6 x 1.0 in. (69 x 118 x 27 mm)  
Accessories: - R841 electromechanical relay  
In automatic changeover, the thermostat detects when the system  
switches between heat mode and cool mode by comparing the air  
supply temperature with the ambient temperature. If the thermostat  
is in heat mode, it switches to cool mode when the air supply is  
cooler than ambient by 9°F (5°C) or more. If it is in cool mode, it  
switches to heat mode when the air supply is warmer than ambient  
by 9°F (5°C) or more.  
-
-
50014157-001 air duct temperature sensor  
50014156-002 remote room temperature sensor  
Compatible Damper/Valve actuators: VC6930, VC6934, VC6936  
VC7930, VC7934, VC7936  
ML6984  
ML7984  
Note: Neither the heat mode icon ( ) nor cool mode icon (  
)
ML6410, ML7410  
appears when the thermostat is placed in automatic changeover.  
ML6161B2024, MN6105A1011  
ML7161A2008, MN7505A2001  
5
.5.2 Changeover Input  
2
Wiring: 18 AWG (1 mm ) wire  
The thermostat is in the default mode when the contact between ter-  
minals 9 and 11 is open and switches mode when the contact is  
closed. The default mode is set via the configuration menu.  
Mounting: - directly to drywall  
-
-
single-gang NEMA standard 2-in x 4-in electrical box  
double-gang NEMA standard electrical box with mounting plate  
Note: The changeover contact state is ignored if the thermostat is  
configured in automatic changeover or in limited cooling.  
7
. Warranty  
5
.6 Night Setback  
Honeywell warrants this product, excluding battery, to be free from defects in  
the workmanship or materials, under normal use and service, for a period of  
two (2) years from the date of purchase by the consumer. If at any time dur-  
ing the warranty period the product is determined to be defective or malfunc-  
tions, Honeywell shall repair or replace it (at Honeywell's option).  
If the product is defective,  
The Night Setback (NSB) mode is activated when the  
contact between terminals 9 and 12 is closed. When the  
thermostat is in the NSB mode, indicated by the ECONO  
display, the temperature is lowered or raised by the set  
NSB value depending whether the thermostat is in heat  
mode or cool mode respectively. The NSB value is set via the con-  
figuration menu.  
(
i) return it, with a bill of sale or other dated proof of purchase, to the place  
from which you purchased it, or  
(
ii) call Honeywell Customer Care at 1-800-468-1502. Customer Care will  
make the determination whether the product should be returned to the  
following address: Honeywell Return Goods, Dock 4 MN10-3860, 1885  
Douglas Dr N, Golden Valley, MN 55422, or whether a replacement  
product can be sent to you.  
Night Setback Override  
To temporarily override the NSB mode, press the Over-  
ride button. The NSB mode is lifted for the next 2 hours  
or until the Override button is pressed again. During the  
override, the normal setpoint is used and OVERRIDE is  
displayed.  
This warranty does not cover removal or reinstallation costs. This warranty  
shall not apply if it is shown by Honeywell that the defect or malfunction was  
caused by damage which occurred while the product was in the possession  
of a consumer.  
5
.7 Error Codes  
Honeywell's sole responsibility shall be to repair or replace the product  
within the terms stated above. HONEYWELL SHALL NOT BE LIABLE FOR  
ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL  
OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR INDI-  
RECTLY, FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR  
IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT. Some states do  
not allow the exclusion or limitation of incidental or consequential damages,  
so this limitation may not apply to you.  
The following error codes can appear at the top of the display.  
E1: The internal temperature sensor is defective  
E2: The internal temperature sensor is shorted  
E3: The external temperature sensor is defective or not connected  
E4: The external temperature sensor is shorted  
THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL  
MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED WAR-  
RANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND  
FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE  
TWO-YEAR DURATION OF THIS WARRANTY. Some states do not allow  
limitations on how long an implied warranty lasts, so the above limitation  
may not apply to you.  
This warranty gives you specific legal rights, and you may have other rights  
which vary from state to state.  
If you have any questions concerning this warranty, please write Honeywell  
Customer Relations, 1985 Douglas Dr, Golden Valley, MN 55422 or call  
6
. Technical Specifications  
Power: 24 VAC  
Current consumption: 25 mA  
Output signals: Depends on output configurations  
Output ratings:  
-
-
-
Triac output: 0.5 A maximum @ 24 VAC  
Analog output (SCR connection): 0 - 10 V, 10kΩ minimum  
Analog output (SSR connection): 0 - 10 V, 45 mA maximum  
1-800-468-1502.  
Setpoint range: 50°F to 95°F (10°C to 35°C)  
Temperature display: 32°F to 140°F(0°C to 60°C)  
Temperature display resolution: 1°F (0.5°C)  
Mode hysteresis: 4°F (2°C)  
8. Customer Assistance  
Automatic changeover deadband: 9°F (5°C)  
Duty cycle: Depends on output configurations  
NSB offset: Programmable 2°F to 18°F (1°C to 9°C)  
NSB override period: 2 hours  
If you have any questions regarding your thermostat, please go to  
http://customer.honeywell.com, or call Honeywell technical hot-  
line at 1-888-245-1051.  
Memory protection: Configuration and setpoint  
Temperature control: Proportional integral adaptive (P.I.A.)  
Operating temperature: 32°F to 140°F (0°C to 60°C)  
Storage temperature: -4°F to 122°F (-20°C to 50°C)  
TB6980/TB7980  
Printed in USA  
07/2012  
6/6  

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