Honeywell TB6980, TB7980 User Manual

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:

•	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 cooling)

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

Configuration and status display

	Heating mode
Cooling mode	Temperature display
Temperature	Output power display
adjustment
button
Override button

2.1 Mounting Instructions

2.2 Terminal Designations

1.Remove the thermostat from its base by unscrewing the capThe designations of the terminals vary according to the particular

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 captive screw.

model of thermostat. Refer to the following table for the description of each terminal.

	TERMINAL		DESCRIPTION
	1	24 VAC	Power supply
	2	COM
	3	AN1		TB7980 models
	4	COM
			Output 1
	3	OPEN		TB6980 models
	4	CLOSED
	5	T2/AN2	Output 2 (TB6980B and TB7980B models)
	6	T2/COM
	7	T3	Output 3 (TB6980B and TB7980B models)
	8	T3
	9	COM	External sensor input. (For applications requiring
	10	SENSOR	an external sensor, see section 4.2.)
	9	COM	Mode Changeover input (N.O. contact). See sec-
	11	C-Over	tion 5.5.2.
	9	COM	Night Setback activation input (N.O. contact).
	12	NSB	See section 5.6.

Note: To configure the terminals, see section 4.

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3. Typical Applications

TB6980B

TB7980B

FIGURE 1: Damper control with electric reheat and auxiliary

FIGURE 2: Damper control with electric reheat and auxiliary

baseboard heating.

hot-water heating

TB7980B

TB6980B

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	Do not connect
common to ground	common to ground

FIGURE 5: Changeover and NSB inputs sharing the same

24-Vac transformer FIGURE 6: Changeover and NSB inputs using different 24-Vac transformers

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