Honeywell TB6980, TB7980 User Manual
1. Introduction
Configuration and status display
Heating mode
Temperature display
Output power display
Temperature
adjustment
button
Cooling mode
Override button
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:
• TB7980A (single output, modulating) • TB6980A (single output, floating)
• TB7980B (multiple output modulating) • TB6980B (multiple output, floating)
Depending on the models, the thermostat can have up to three outputs for the following applications:
Floating or Modulating damper/valve actuator control
Damper/valve actuator control with duct reheat and auxiliary
heat (B models only)
Hydronic systems (room control, perimeter heating and cool-
ing)
Accessories
R841 family of electromechanical relays
T7770A3002 remote room sensor
50014156-002 remote room sensor
32004800-001 bare thermistor
50014157-001 duct temperature sensor
TB6980/TB7980
Installation and User Guide
ZonePRO Thermostats
2. Installation
2.1 Mounting Instructions
1. Remove the thermostat from its base by unscrewing the captive screw and tilting the bottom of the thermostat up. The
screw cannot be completely removed.
2. Pass the wires through the center hole of the base and secure
the base to the wall or onto an electrical box.
3. Wire the thermostat. See section 2.2 for terminal designations
and section 3 for typical wiring diagrams.
4. Reinstall the thermostat onto its base and secure with the captive screw.
2.2 Terminal Designations
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
1224 VAC
COM
34AN1
COM
34OPEN
CLOSED
56T2/AN2
T2/COM
78T3
T3
910COM
SENSOR
911COM
C-Over
912COM
NSB
Note: To configure the terminals, see section 4.
Power supply
TB7980 models
Output 1
TB6980 models
Output 2 (TB6980B and TB7980B models)
Output 3 (TB6980B and TB7980B models)
External sensor input. (For applications requiring
an external sensor, see section 4.2.)
Mode Changeover input (N.O. contact). See section 5.5.2.
Night Setback activation input (N.O. contact).
See section 5.6.
TB6980/TB7980 1/6
3. Typical Applications
FIGURE 1: Damper control with electric reheat and auxiliary
baseboard heating.
FIGURE 3: Damper control with automatic changeover,
electric reheat and central cooling
FIGURE 5: Changeover and NSB inputs sharing the same
24-Vac transformer
FIGURE 6: Changeover and NSB inputs using different 24-Vac
transformers
FIGURE 4: Temperature control of fresh air supply
FIGURE 2: Damper control with electric reheat and auxiliary
hot-water heating
CAUTION
Do not connect
common to ground
CAUTION
Do not connect
common to ground
TB7980B
TB6980B
TB7980B
TB7980B
TB7980B
TB6980B
TB6980/TB7980 2/6
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