Honeywell Thermostat TB6980 User Manual download pdf

TB6980/TB7980 1/6

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:

Depending on the models, the thermostat can have up to three out-

puts 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

2. Installation

2.1 Mounting Instructions

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.

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 cap-

tive 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.

• TB7980A (single output, modulating) • TB6980A (single output, floating)

• TB7980B (multiple output modulating) • TB6980B (multiple output, floating)

Configuration and status display

Heating mode

Temperature display

Output power display

Temperature

adjustment

button

Cooling mode

Override button

TERMINAL DESCRIPTION

24 VAC

COM

Power supply

AN1

COM

Output 1

TB7980 models

OPEN

CLOSED

TB6980 models

T2/AN2

T2/COM

Output 2 (TB6980B and TB7980B models)

Output 3 (TB6980B and TB7980B models)

COM

SENSOR

External sensor input. (For applications requiring

an external sensor, see section 4.2.)

COM

C-Over

Mode Changeover input (N.O. contact). See sec-

tion 5.5.2.

COM

NSB

Night Setback activation input (N.O. contact).

See section 5.6.

Note: To configure the terminals, see section 4.

TB6980/TB7980

Installation and User Guide

ZonePRO Thermostats

1 2 3 4 5 6

Summary of Contents

Page 1 - TB6980/TB7980

TB6980/TB7980 1/61. IntroductionThe TB6980/TB7980 digital thermostats provide proportional plusintegral individual space temp

Page 2 - 3. Typical Applications

TB6980/TB7980 2/63. Typical ApplicationsFIGURE 1: Damper control with electric reheat and auxiliarybaseboard heating.FIGURE 3: Damper control with aut

Page 3 - 4. Configuration

TB6980/TB7980 3/64. Configuration4.1 Configuration Menus (See following pages for explanations)TB7980A modelApplication (section 4.2)Default mode &

Page 4 - 4.3 Output 1

TB6980/TB7980 4/64.2 Application TypesThe following table shows the different thermostat applications andtheir corresponding settings in the configura

Page 5 - 5.Operation

TB6980/TB7980 5/64.5 Output 3 (models TB6980B and TB7980B)The following table shows the output types for Output 3 and theircorresponding settings in t

Page 6 - 8. Customer Assistance

TB6980/TB7980 6/65.5.1 Automatic changeoverIn automatic changeover, the thermostat detects when the systemswitches between heat mode and cool mode by